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Epigenetic regulation in major depression and other stress-related disorders: molecular mechanisms, clinical relevance and therapeutic potential

Minlan Yuan, Biao Yang, Gerson Rothschild and 6 more

Signal Transduction and Targeted Therapy · 2023 · Review · CC BY

Abstract

Major depressive disorder (MDD) is a chronic, generally episodic and debilitating disease that affects an estimated 300 million people worldwide, but its pathogenesis is poorly understood. The heritability estimate of MDD is 30–40%, suggesting that genetics alone do not account for most of the risk of major depression. Another factor known to associate with MDD involves environmental stressors such as childhood adversity and recent life stress. Recent studies have emerged to show that the biological impact of environmental factors in MDD and other stress-related disorders is mediated by a variety of epigenetic modifications. These epigenetic modification alterations contribute to abnormal neuroendocrine responses, neuroplasticity impairment, neurotransmission and neuroglia dysfunction, which are involved in the pathophysiology of MDD. Furthermore, epigenetic marks have been associated with the diagnosis and treatment of MDD. The evaluation of epigenetic modifications holds promise for further understanding of the heterogeneous etiology and complex phenotypes of MDD, and may identify new therapeutic targets. Here, we review preclinical and clinical epigenetic findings, including DNA methylation, histone modification, noncoding RNA, RNA modification, and chromatin remodeling factor in MDD. In addition, we elaborate on the contribution of these epigenetic mechanisms to the pathological trait variability in depression and discuss how such mechanisms can be exploited for therapeutic purposes.

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From PubMed Central, U.S. National Library of Medicine, as current on Oct 24, 2026. Paragraph numbers are ours, so an answer can point at one.

Introduction

1Major depressive disorder (MDD) affects an estimated 300 million people worldwide. The condition is characterized by episodes of low mood, anhedonia or loss of interest, feelings of guilt or worthlessness, suicidal thoughts, psychomotor retardation or agitation, impaired cognitive function, and physical symptoms such as changes in appetite and disrupted sleep patterns., It has become one of the leading cause of disease burden worldwide,– impairs human capability in terms of education, employment and relationships, and is also linked to premature mortality from suicide and other diseases.– It has been reported that the prevalence and burden of depressive and anxiety disorders have increased dramatically worldwide (more than 25% during the first year of the pandemic) during the COVID-19 pandemic, thus posing grave challenges for mental health services during and after the epidemic. To date, causal mechanisms and pathogenesis of MDD are only partly understood. The heritability of MDD is estimated to be about 35%, which is lower than estimates of genetic contributions to other psychiatric disorders like schizophrenia and bipolar disorder (with heritability rates thought to be 65–70%). Genome-wide association studies (GWAS) have recently identified over 80 reproducible loci contributing to MDD, each with only a small effect., Moreover, the variance explained by major depression polygenic risk scores based on these genomic loci is still a very low fraction of the total heritable risk. These findings suggested that we are yet to discover most gene variants contributing to the genetic risk and that genetics alone do not account for most of the risk of major depression.

2Epidemiological studies indicate that environmental factors are strongly associated with the risk of developing MDD and other stress-related disorders.– Early studies examined how stressful life experiences affected MDD, usually in the year preceding its onset., These documented stressful events occur mainly in adulthood. They include bereavement, financial crisis, loss of employment, separation, academic setbacks, life-threatening or chronic health problems, persistent physical pain, and exposure to violence. Adverse experiences early in life, such as maternal stress during pregnancy and poor maternal care after childbirth, childhood physical and sexual abuse, emotional neglect, bullying, or early separation from parents, are associated with subsequent onset, severity and chronicity of MDD., Epigenetics is a molecular mechanism that has attracted attention as it helps explain the biological impact of environmental factors.,

3Epigenetics refers to short- and long-term gene expression variations that are caused by non-DNA-encoded mechanisms., These mechanisms include DNA methylation or hydroxymethylation, chemical changes occurring on histone proteins (histone modification), expression of noncoding RNAs, chromatin remodeling, and RNA modification. These interconnected mechanisms can mold how a cell responds at a molecular level., Epigenetic regulation mediates direct epigenetic effects or gene-by-environment interactions and can lead to complex diseases., The importance of epigenetic alterations and their effects on almost every biological pathway involved in the pathophysiology of MDD and other stress-related disorders, such as anxiety disorders and post-traumatic stress disorder (PTSD) is increasingly appreciated.– Epigenetics can regulate neuronal plasticity and memory consolidation.– Epigenetic regulation plays a mediating role for abnormal stress response systems, monoamine neurotransmitter dysfunction and neuroinflammation in MDD, and other stress-related disorders in animal models.,

4In this review, we first provide an overview of our current understanding of the functional role of different types of epigenetic regulation, including DNA methylation, histone modification, noncoding RNAs and some newly studied modifications such as RNA modification and chromatin structure remodeling factor in stress-related disorders (Fig. 1). Specifically, we discuss the roles of these epigenetic alterations in MDD pathophysiology, including neuroplasticity, neuroendocrinology, neurotransmission, and neuroinflammation. We explain how these epigenetic mechanisms might facilitate diagnosis and treatment of MDD.

DNA methylation regulates MDD progression

5DNA methylation is the covalent addition of a methyl group to DNA’s cytosine residues, resulting in a methylcytosine (mC) base. In the human genome, mC most frequently occurs at CpG sites (cytosine followed by a guanine base in the DNA sequence)., In addition, cytosines followed by a non-guanine base, such as cytosine, adenine, or thymine, might also experience DNA methylation. In brain tissues, such non-CpG methylation is a common alteration that increases in frequency during development. DNA methyltransferases (DNMTs) include DNMT1, DNMT2, DNMT3A, DNMT3B, and DNMTL (Fig. 2)., Methylated DNA triggers a recognition response by proteins known as methyl-CpG-binding domain (MBD) proteins, which lead to the recruitment of other proteins that either activate or repress gene expression. Methyl-CpG binding protein 2 (MeCP2) and methyl-CpG-binding domain 1 (MBD1) are two examples of MBD proteins that detect methylated DNA and are known for their association with neurodevelopment.– DNA methylation is widely recognized as the most extensively researched epigenetic mechanism and is generally believed to be stable over the course of an organism’s lifetime.

The location and functional effects of DNA methylation

6It is often postulated that increased methylation of CpG islands in promoter regions results in the suppression of gene expression, and decreased methylation leads to increased gene expression. For example, increased CpG methylation in the promoter region of the gene encoding brain-derived neurotrophic factor (BDNF) has been found to correlate with a decreased synthesis of BDNF in neurons. However, this only reliably occurs in the promoter region surrounding the first exon. For other genomic locations, this is different. One study showed that the methylation of non-proximal promoters, which is dependent on DNMT3a, enhances the expression of a large cohort of neurogenic genes. Another study demonstrated a positive correlation between gene expression and gene body methylation. In clinical studies, variable associations of DNA methylation and MDD have been shown to occur in regions outside the promoter. One example showed hypomethylation of synapsins (SYN2) linked to depression. In contrast, a study found that patients with MDD had increased methylation in the TESC gene, negatively correlated with the right parahippocampal cingulum integrity. These studies suggest that the association between methylation changes and MDD is diverse, with no common effects throughout the genome or specific genomic locations.

7Methylation adds to the diversity of genomic responses because DNA methylation impairs access of transcription factors to gene regulatory regions. When a recruited transcription factor is inhibitory, DNA methylation results in enhanced gene expression. Another possible reason for different transcriptional effects of DNA modifications may be the presence of variant forms of 5-methylcytosine, such as 5-hydroxymethylcytosine, which is produced by the addition of hydroxyl groups to 5-methylcytosine under the action of the ten-eleven translocation (TET) enzymes (Fig. 2)., Currently, the majority of reports in the literature do not differentiate between DNA methylation and hydroxymethylation, and assays that rely on bisulfite conversion measure both modifications indiscriminately. Future studies must investigate these two changes in parallel to provide more information.

8Non-CpG methylation is highly concentrated in neurons and glial cells and accumulates in neurons as they mature. It is a rare occurrence in the frontal cortex of human fetuses; however, it increases significantly during later stages of life. This increase in non-CpG methylation is accompanied by the development of synapses and increased synaptic density. As more research is conducted, it becomes increasingly evident that non-CpG methylation plays a significant role in regulating gene activity and can continue to function in the adult brain, where it may act similarly to CpG methylation in repressing transcription. A previous study showed that the binding of MeCP2 to non-CpG methylates DNA sequences is critical for BDNF expression. This process influenced the onset timing for Rett syndrome. Although the importance of non-CpG methylation in the nervous system has been demonstrated, whether it contributes to the pathophysiology of MDD and other stress-related disorders remains poorly investigated and requires further study.

Sensitive periods of DNA methylation in stress vulnerability

9Exposure to environmental factors such as stress, toxins, or viruses at particularly vulnerable times of fetal development or early infancy may predispose the body to diseases in adulthood. Some of these effects may be mediated by epigenetic mechanisms., Early stages of life, from embryonic development through adolescence, include the ages during which the development and the later plasticity capacity of neuronal circuits are formed, along with immune, stress response, and hormone regulation pathways. These early stages are a time window when there is greater susceptibility to environmental toxins than at later periods in life.–

10Previous studies undertaken in the rat explored potential mechanisms to explain how maternal care practice variations impact the development of individual variances in the stress response.– Female Long-Evans rats differ significantly in how frequently they lick/groom (LG) their pups, which is a stable feature of the maternal phenotype. When compared to animals raised by high LG mothers, the adult offspring from low LG mothers had less hippocampal glucocorticoid receptor (GR) and protein expression, lower plasma pituitary adrenocorticotropin (ACTH) and impaired corticosterone responses to acute stress,,, and was more vulnerable to show learned helplessness to environmental stress. In the hippocampus of adult rats with low maternal care, the transcription factor nerve growth factor-inducible factor A (NGFI-A) binding region of the GR promoter 17 gene is hypermethylated, but in those with high maternal care, it is hypomethylated. Cross-fostering reverses these methylation discrepancies. However, when the timing of the stressor was shifted to adulthood, there was little effect on the GR promoter methylation levels in the brain (neither in the hippocampus or hypothalamic paraventricular nucleus). However, an increase in methylation levels in the peripheral hypothalamic-pituitary-adrenal (HPA) axis tissues was found to be accompanied by chronic stress. The findings of these animal studies illustrate how DNA methylation is affected by the timing of stress relative to sensitive periods.

11Studies using human postmortem tissues also showed a link between early life adversity and epigenetic regulation of GR expression in the hippocampus. Lower GR expression along with higher levels of cytosine methylation of the GR promoter exon 1 F have been reported in suicide decedents with a history of childhood abuse than in suicide decedents without a history of abuse as well as in non-suicide controls. Cell type-specific alterations in the methylation of DNA in oligodendrocyte genes along with a general disruption of the transcriptional program related to myelin, were reported in depressed suicide decedents with childhood maltreatment. Impaired myelination in the anterior cingulate cortex in those with childhood abuse was also observed. Furthermore, recent clinical studies demonstrate that the developmental timing of childhood adversity, with sensitive periods before three years of age, explains more variability in DNA methylation than the accumulation or recency of exposure. This suggests that early childhood is a crucial time when exposure to life stress predicts altered DNA methylation patterns.

Tissue specificity

12DNA methylation changes in major depression and other stress-related disorders are observed in the brain and other tissues. While brain tissue is usually not available in living human studies, DNA derived from peripheral blood cells, saliva, and cheek swabs is accessible from live subjects. It may enable extensive epigenetic research using samples from various age groups, as well as repeated sampling over time., Whether findings from peripheral tissues are meaningful indicators of the pathogenesis of MDD remains to be delineated. Previous work indicates some overlap between MDD-associated differentially methylated regions (DMRs) in blood and the MDD-associated DMRs in the prefrontal cortex and other brain regions.– One study, despite a small sample size, reported that three loci located in GABBR2, RUFY3, and in an intergenic region on chromosome 2, were replicated in blood and some cortical regions (Brodmann area (BA) 10 and 25). These genes are involved in normal brain development and function.

13However, several studies have reported that most DNA methylation markers detected in the peripheral tissues cannot accurately predict the DNA methylation status of the brain. The latest advancements in array techniques enabled the use of hypothesis-free paradigms to examine the association of DNA methylation changes across the entire genome to study different phenotypes. Unbiased, genome-wide studies using peripheral blood have reported epigenetic alterations in genes predominantly unassociated with established candidate genes selected based on known pathogenic findings, such as the serotonin transporter gene (SLC6A4) and brain-derived neurotrophic factor (BDNF),– indicating alternative or additional pathogenic mechanisms.– Another study comparing DNA methylation across the whole genome in live human brain tissue with that in peripheral (blood, saliva, and buccal) tissues concluded that the patterns unique to the target genomic region must be considered when selecting the best surrogate tissue to mimic brain DNA methylation. Nevertheless, DNA methylation detected in the brain or peripheral tissue could offer instructive insights into different biological pathways implicated in the etiopathogenesis of MDD and other stress-related psychiatric disorders (Fig. 2, Table 1).

Cell-type specificity

14In addition to tissue specificity considerations, cell-type specificity in epigenetic research could provide more precise insights into the molecular pathology of MDD. In mice that were subjected to chronic stress and exhibiting severe depressive behavior, DNMT3A levels were found to be higher in the nucleus accumbens (NAc) than controls. Studies examining postmortem brain tissue reported lower DNMT1 levels and higher DNMT3B levels in the frontopolar cortex. The study also reported reduced expression of DNMT1 and DNMT3B in the amygdala, and increased expression of DNMT3B in the paraventricular nucleus of depressed suicide decedents. Therefore, changes in DNMT mRNA expression occurred in specific cells of autopsied brain tissue in depressed suicide decedents. Fluorescence-activated cell sorting detected oligodendrocyte-specific DNA methylation changes in MDD postmortem. Consistent with the consideration of cell-type specificity in preclinical studies, some clinical studies using peripheral blood to examine DNA methylation changes in MDD corrected for cell composition,, with the authors focusing mainly on peripheral immune cells implicated in the pathophysiology of psychiatric disorders.

15Changes in DNA methylation of particular genes within specific brain cells that are linked to depression are also evident. DNA methylation at the glial cell-derived neurotrophic factor (Gdnf) promoter with distinct epigenetic modulator complexes between depression-susceptible and depression-resistant animals was increased by chronic stress. A methylation map specific to astrocytes throughout the genome indicated less methylation in GRIK2 (glutamate receptor, ionotropic kainate 2) and BEGAIN (brain-enriched guanylate kinase-associated protein) associated with depressive psychopathology. Single-cell epigenomics is based on sequencing single nuclei, barcoding all the transcripts from each nucleus, and using the expression pattern to sort the nuclei into specific cell subtypes. This technique may be an excellent approach to further investigate changes in specific genes in specific brain cells in MDD-associated DNA methylation; however, single-nucleus, postmortem brain studies of MDD are rare.

Histone modifications in the pathogenesis of MDD

16Histones are essential proteins rich in lysine and arginine residues in eukaryotic somatic chromatin. The DNA molecule (approximately 150 bp) is enveloped by histone octamers, which comprise two sets of fundamental histones (H2A, H2B, H3, and H4), to form a single nucleosome, the basic repeating subunit of chromatin. Histones regulate gene expression both positively and negatively. This is mainly governed by posttranslational modifications catalyzed by enzymes that act on particular amino acid residues located on histones. The H3-H4 tetramer is stable and allows histone modifications to be heritable epigenetic marks. The lengthy tails extending from the nucleosome of H3 and H4 histones can be covalently changed in several locations. Methylation, acetylation, phosphorylation, ubiquitination, SUMOylation, crotonylation, citrullination, and ADP-ribosylation are a few modifications of the tail., Acetylation or methylation of lysine or arginine residues are the most common modifications observed, which alter the interactions between histones or transcription factors and DNA, regulating gene expression. Furthermore, studies have suggested that the patterns of DNA methyltransferase localization, DNA methylation, and actively transcribed gene bodies may be specified by histone modifications.,

Histone acetylation in stress response and neuroplasticity

17Histone acetylation at lysine residues (mainly including K9, K14, K18, K23, and K27), is commonly linked to the activation of gene transcription. Acetylation is typically observed at the transcriptional start sites and enhancers of genes that are actively transcribed. The “writers” that mediate histone acetylation include histone acetyltransferases (HATs) for the addition of the acetylation mark. The “eraser” histone deacetylases (HDACs) eliminate acetyl groups from lysine residues (Fig. 3c); as a result, the ionic interaction between histones and DNA increases, DNA packs more tightly and chromatin is more highly condensed. HDACs are grouped into two families: the traditional HDACs and the NAD+-dependent, silent information regulator (SIR2) family of HDACs. The former includes three phylogenetic classes: I (HDAC1, 2, 3, and 8), II (HDAC4, 5, 6, 7, 9, and 10), and IV (HDAC11). The SIR2 family of HDACs, sometimes called class III HDACs or sirtuin (SIRT), deacetylates both histone and nonhistone proteins, modulating many cellular processes,, and influencing gene expression.

18As a stress-related disorder, major depression is associated with an abnormal stress response system. For example, excessive cortisol release in response to stress and impaired GR-mediated feedback inhibition have been known for decades., The NR3C1 gene encodes for the GR,, which is an essential component of the HPA axis. As a transcription factor, the GR interacts with and influences the histone landscape, playing a critical role in shaping it., Animal models for studying depression have been established based on exposure to different forms of stressors in rodents such as early life stress (ELS), chronic social defeat stress, and chronic unpredictable mild stress. These models, combined with the ability to assess anhedonia, anxiety- and depression-related behavior objectively and learned helplessness in rodents, have helped to elucidate the link between stress and vulnerability to depression as mediated by epigenetic changes (Fig. 3a). Histone acetylation changes, primarily mediated by HDAC, impact the stress response, depression-like behavior, and antidepressant effects.,–

Class I HDACs involved in antidepressant effects and neuronal plasticity

19Early evidence supporting the involvement of HDACs in the stress response and antidepressant action showed that mice exposed to chronic social defeat stress experienced a temporary reduction followed by a lasting escalation in histone acetylation levels (H3K14ac), which was connected to decreased histone deacetylase 2 (HDAC2) levels in the NAc. Infusion of HDAC inhibitors (i.e., MS-275) into the NAc reversed global gene expression patterns in the NAc and improved depression-like behaviors. The observation that MS-275 had antidepressant effects suggested that histone acetylation plays an adaptive role in the response to stress. This was supported by another study showing that animals overexpressing HDAC2 in the NAc region exhibit more depression-like behavior.

20Although primarily manifested as depression, MDD also results in cognitive impairments., Neuronal plasticity and cognitive function are associated with transcriptional changes regulated by HDAC-mediated epigenetic modification. The overexpression of HDAC2 specifically in neurons resulted in a decrease in dendritic spine density, synapse number, synaptic plasticity, and memory formation in mice. However, prolonged administration of HDAC inhibitors improved synapse number and learning impairment. Furthermore, a promoter occupancy analysis has revealed a link between HDAC2 and the promoters of genes that play a role in synaptic plasticity and memory formation. Consistent with these findings, viral-mediated knockdown of HDAC2 can restore both structural and synaptic plasticity, ultimately leading to an improvement in memory loss associated with neurodegeneration.

Class II HDACs have opposite roles in different brain regions related to depression

21Studies with class II HDACs (i.e., HDAC4 and HDAC5) revealed different roles for these molecules. The AChE gene, which encodes the acetylcholine-hydrolyzing enzyme acetylcholinesterase, was downregulated in the hippocampus after stress and accompanied by decreased acetylation and increased trimethylation of H3K9 at the corresponding promoter, as well as HDAC4 accumulation in hippocampal neurons. These effects were reversed drastically by administration an HDAC inhibitor, and reduced hippocampal HDAC4 levels restored the long-lasting behavioral deficit. In addition, overexpression of HDAC4 in the hippocampus caused adult rats to be depressive but not anxious.

22HDAC4 exhibits high expression levels in the forebrain and is enriched in neurons., It shuttles between the cell nucleus and cytoplasm. Cytoplasmic localization of HDAC4 is maintained by HDAC phosphorylation, suppressing the binding of the transcription factor MEF2, whereas HDAC4 dephosphorylation by calcineurin allows nuclear translocation. Nuclear HDAC4 functions as a transcriptional repressor, downregulating the expression of numerous plasticity-related genes, that may mediate effects on learning and memory impairment in mice., In contrast, the role of cytoplasmic HDACs is less understood. HDAC4 in the cytoplasm may have neuroprotective effects.– Inhibiting HDAC4 delayed the formation of huntingtin protein cytoplasmic aggregates, while the levels of BDNF transcripts were restored, resulting in the restoration of neuronal and cortico-striatal synaptic function in mouse models of neurological disorders.

23Regarding HDAC5, chronic imipramine (a tricyclic antidepressant) administration to mice with chronic social defeat behavior was linked to a selective downregulation of HDAC5 in the hippocampus; viral-mediated HDAC5 overexpression blocked the antidepressant-like effect of imipramine. In another study of chronically stressed rats, a significant decrease in histone acetylation (H4K12Ac) and phosphor-acetylation (H3K9/S10) was observed in CA3 and dentate gyrus (DG) in stressed animals compared with control animals, along with increased HDAC5 expression. HDAC5 seems to play a role of promoting depression in the hippocampus, but in other brain regions, HDAC5 may have the opposite effect. For example, mice exposed to chronic social defeat stress showed decreased HDAC5 expression in the NAc, whereas chronic administration of imipramine increased HDAC5 expression in NAc, suggesting a pro-resilient role of HDAC5 in the NAc. Rats exposed to variable mild stress manifested decreased HDAC5 in the central amygdala (CeA). Acetylation in the amygdala could potentially be an advantageous adaptation. Transiently increased H3K14 acetylation in the amygdala of mice followed by chronic social defeat stress. Conversely, the injection of an HDAC inhibitor into the amygdala reversed social avoidance. Changes of HDAC5 in the amygdala resemble the observations made in the NAc of mice following exposure to stress, suggesting a homeostatic role, in contrast to the pro-depressive effect in the hippocampus. The reason why HDAC5 plays opposite roles in different brain areas may lie in its involvement in diverse complexes that target specific gene subsets associated with depression.

Class III HDACs associate with depression

24In addition to classical HDACs, class III HDAC (i.e., SIRT), which deacetylates histones and nonhistone proteins, also appears to be associated with hippocampal neuroplasticity and depression-like behavior.– Activation of SIRT in the hippocampus exerts antidepressant effects and blocks abnormal dendritic structures. Blocking SIRT1 function in the hippocampus increases depression-like behaviors. SIRT1 is also one of the first genes (SNPs; rs12413112) identified using GWAS to be associated with MDD., Furthermore, lower SIRT expression levels in peripheral blood samples of MDD patients align with findings from other studies. Taken together, these findings suggest that activating SIRT1-dependent pathways may be a potential therapeutic strategy for MDD.

Differential histone modification in human samples

25Some studies examined histone modifications in the human postmortem brain or the expression of histone-modifying enzymes in the peripheral blood cells in MDD (Fig. 3b). Expression of Rac1, involved in synaptic structure regulation, was low in NAc postmortem tissues in MDD and associated with lower histone H3 pan acetylation and more histone H3K27 trimethylation. In addition, differential brain expression of HDACs was found in the postmortem in MDD., Expression of HDAC2 and HDAC5 was higher during a depressive state, compared with remission, in peripheral white blood cells of patients diagnosed with MDD and bipolar disorder (BPD). The expression of HDAC6 and HDAC8 was lower regardless of mood states compared with controls in BPD, while the HDAC4 expression was higher only in a depressive state. This study links altered expression of HDACs with depression and is consistent with a potential homeostatic role of histone acetylation in response to stress and depression. Antidepressant treatment caused higher peripheral HDAC5 expression to decrease to control levels after about eight weeks of treatment. It is impossible to separate in clinical studies whether biology that fluctuates with the severity of illness is a homeostatic response, a measure of the stress due to the illness severity, or part of the pathophysiology responsible for illness severity.

26Collectively, stress-induced depression is associated with decreased histone acetylation. HDACs appear to be involved in neuroplasticity, neuronal survival, and cognition and may become potential targets of antidepressant intervention. HDAC inhibitors restore memory deficits in mice, but it remains to be seen whether modifying HDACs ameliorates cognitive impairments and depression in humans.

Histone methylation in stress response and depression

27Histone methylation involves the transfer of methyl groups to amino acids in histone proteins, occurring at various locations along the histone tails, resulting in the addition of one, two, or three methyl groups to the lysine or arginine residues. In contrast to histone acetylation, histone methylation is in general linked to transcriptional repression. However, in some cases, the relationship between histone methylation and transcription depends on the level of methylation and the site of the residue. For example, methylation of H3K9 and H3K27 leads to repressed gene expression; while histone methylation of H3K4 in the promoter regions results in relaxed chromatin, which promotes gene expression. The enzymes that facilitate histone methylation include histone methyltransferases (HMTs) and histone demethylases (HDMs), which transfer or remove methyl groups from target residues using S-Adenosyl methionine as a methyl donor.

28Trimethylation of histone 3 lysine 4 (H3K4me3) is one of the most characteristic histone modifications. When exposed to chronic unpredictable mild stress (CUMS), the level of H3K4me3 was decreased at the promoter region of the Gdnf gene, which led to altered Gdnf expression in the ventral striatum in mice. Interestingly, enhancement of H3K4me3 was found in postmortem brain tissue (BA10) in MDD: the enriched H3K4me3 was found at transcriptional start sites of synapsin 1, relevant to increased expression of synapsin 1a and synapsin 1b. These synapsins are critical in synapse function and plasticity. Other forms of histone methylation include H3K9me2 and H3K27me3, are repressive in the gene promoter region in response to stress., Rats exposed to the early stress of maternal separation (ES) exhibited decreased H3K9me2 modification at the BDNF IV promoter site, along with increased BDNF levels, enhanced hippocampal neurogenesis, and better cognitive performance in both the postnatal life and young adulthood. Interestingly, middle-aged rats that experienced early maternal separation exhibited impaired cognition, reduced H3K9me2 regulation of the BDNF expression, and opposite changes in the hippocampal neurogenesis, suggesting both biphasic and distinct, age-dependent changes in the histone methylation in response to ES. Another study showed elevated H3K9me2 levels and reduced BDNF levels in the hippocampus and medial prefrontal cortex (mPFC) in CUMS rats showing depression-like behaviors. In addition, higher H3K9me2 levels at the calmodulin-dependent protein kinase II α (CaMKIIα) promoter and inhibition of CaMKIIα were found in MDD and mice following antidepressant administration. The activation of H3K27me3 in the NAc of mice exposed to social defeat stress inhibits the expression of RAS-related C3 botulinum toxin substrate 1 (Rac1), a Rho GTPase–related gene known for synaptic structure regulation.

29In parallel to prominent findings for HDACs, related enzymes for histone methylation and demethylation (HMTs and HDMs) also were potentially crucial in depression. Higher expression of Setdb1, an H3K9-specific HMT in the mouse forebrain, was associated with changes in the composition of NMDA receptor subunits, as well as other molecular modifications resulting from suppressive chromatin remodeling at specific target genes. This regulation led to anhedonia, despair, and learned helplessness in behavioral paradigms. In line with these findings, downregulation of HMT Ehmt2 (G9a) was associated with loss of repressive histone methylation (H3K9meX) after chronic stress. Protein arginine methyltransferase 1 (PRMT1), another HMT, when knocked out, improved depression-like behavior, along with upregulated expression of BDNF and postsynaptic density protein 95 (PSD95). The histone lysine demethylase jumonji domain-containing 3 was also upregulated in the prefrontal cortex and hippocampus of rats exposed to CUMS.

Other types of histone modifications affecting depression

30Several uncommon histone modifications, such as histone crotonylation, histone phosphorylation, and histone β-hydroxybutyrylation, are shown to be involved in the pathophysiology of MDD.– Histone crotonylation was previously shown to occur at the promoters or enhancers of gens that are actively transcribed, and play a role in spermatogenesis., Similar to histone acetylation, histone crotonylation is catalyzed by HATs, which add a crotonyl group from crotonyl-coenzyme A (CoA) to amino acid residues of histones, while HDACs 1/2/3 and sirtuin 1/2/3, act as decrotonylases.– In the medial prefrontal cortex of mice vulnerable to chronic social defeat stress, histone crotonylation was inhibited. In contrast, chromodomain Y-like protein (CDYL), which acts as both a crotonyl-CoA hydratase and a histone methyllysine reader, was selectively upregulated.

31Histone phosphorylation mainly occurs on serine and threonine residues, though some studies have found that tyrosine residues also can be phosphorylated. Histone phosphorylation in the central nervous system is involved in stress response. For example, the expression of H3S10 phosphorylation (H3S10p) was increased in the hippocampus in mice exposed to fear conditioning. Rats exposed to novelty stress also showed an induction of H3S10p at the c-fos promoter site in the dentate gyrus. To date, few studies have investigated the relationship between histone phosphorylation and MDD. Rats exposed to forced swimming stress showed an increase in H3 phosphorylation in the infralimbic (ILCx) and prelimbic area (PrLCx) of the prefrontal cortex.

32In 2006, histone β-hydroxybutyrylation was reported as a newly-histone modification. It is dynamically controlled by the concentration of hydroxybutyrate in cells. However, the mechanism by which a β-hydroxybutyryl group is added to histones remains unknown., It has been demonstrated that β-hydroxybutyrate exerts an antidepressant-like effect in a rodent model of chronic unpredictable stress,. Injection of β-hydroxybutyrate improved depression symptoms and reversed the reduction of H3K9 β-hydroxybutyrylation and increased BDNF expression. This study emphasized that metabolite changes after stress contribute to histone modification. However, further research is necessary to investigate the homeostasis of other types of histone modifications and the pathophysiological changes associated with MDD.

Susceptibility and adaptation to stress mediated by histone modification

33When exposed to stressful events, only a subgroup of individuals develops major depression.– Two genetically diverse mouse strains show how epigenetic changes underlie susceptibility and adaptation to chronic stress during adulthood. The interplay of genetic factors and environmental stressors can be mediated by histone modifications and DNA methylation in the ventral striatum, thus contributing to behavioral responses to stress. Specific cell types and epigenetic changes affect stress susceptibility in an opposing manner. Fosb-targeted histone acetylation or methylation in different types of medium spiny neurons (i.e., D2-type vs. D1-type) controls stress susceptibility and resilience to social stress.

34Experiencing stress in the early life, commonly known as Early life stress (ELS), increases the likelihood of developing depression, suicidal behavior, and various other psychiatric disorders during adulthood.,– Depressive patients reporting childhood trauma show earlier onset, chronic course, and poorer response to antidepressant treatment. In animal models, long-lasting effects of ELS have been documented.– ELS increased the vulnerability to adult stress in rodents. ELS may not cause immediate behavioral abnormalities but instead causes long-lasting transcriptional alterations that prime critical brain regions to be hyper-responsive to later stress and prone to develop a depression-like state., This was illustrated by a “two-hit” stress model in mice wherein ELS (stress hit number 1) increased susceptibility to depression-like behavior in response to social defeat stress (stress hit number 2) during adulthood.

35Enduring transcriptional alterations were observed in the ventral tegmental area (VTA) in ELS, mediated by the developmental transcription factor orthodenticle homeobox 2 (OTX2). Furthermore, histone methylation (H3K4me1) changes were found in genes targeted by OTX2 binding. The same stress model revealed long-lasting histone modifications in the NAc after ELS. ELS-induced depression susceptibility was caused by decreased histone methylation (H3K79me2) and induction of the DOT1L and KDM2B enzymes that regulate this histone methylation in D2-type medium spiny neurons. In addition, systemic delivery of DOT1L inhibitor reversed ELS-induced behavioral deficits without detectable side effects, suggesting a potential therapeutic target. The regulation of epigenetic markers is complex, involving upregulation or downregulation at hundreds of loci on a genome-wide scale. Thus, more studies are needed using genome-wide histone code profiling such as chromatin immunoprecipitation followed by sequencing.

Noncoding RNAs participate in the development and treatment of MDD

36MicroRNAs (miRNAs), circular RNAs (lncRNAs), long noncoding RNAs (lncRNAs), and other as yet unidentified RNAs are referred as noncoding RNAs (ncRNAs), which do not code for peptides or proteins., Although ncRNAs cannot encode proteins, they can influence the expression of other genes through multiple mechanisms to cause a wide range of disorders.– ncRNAs can regulate expression of genes via the translation or transcription of mRNAs, the methylation of DNA and RNA, or as a modular scaffold of histone modification complexes. Studies have demonstrated that significantly altered ncRNAs expression in MDD relative to healthy subjects. At the same time, antidepressants can also alter the abnormal expression of ncRNAs. ncRNAs may influence the pathophysiology of depression by regulating neuronal function, neurotransmitter release, and microglia (Fig. 4).,,

miRNAs and the development of depression

37MicroRNA molecules are highly conserved small (21–24 nucleotides) RNA molecules. Over 60% of human protein-coding genes are dynamically regulated by miRNAs, thereby influencing cell growth and differentiation. The mechanistic details of miRNA synthesis and maturation have been reviewed and are summarized here. RNA polymerase II converts an intragenic or intergenic miRNA gene into a pri-miRNA (Fig. 5). Following several cleavage and maturation steps, the pre-miRNA is exported to the cytoplasm and incorporated with RNA-induced silencing complexes (RISCs)., miRNA sequences guide the RISC to target mRNA transcripts, resulting in translational cleavage or repression of mRNA. Traditionally it was thought that the miRNAs targeted the 3′ UTRs of transcripts but it has become apparent that 5′ UTRs, coding sequences, and promoters also can be targeted for repression. Because miRNAs have imperfect sequence recognition, they may bind to multiple target genes and modulate their expression. In contrast, aberrant miRNA can contribute to cancers, cardiovascular diseases, metabolic diseases, immune-mediated disorders, and neurological disorders, etc., For example, miR-106b-5p is an oncogenic miRNA that appears to be upregulated in different cancers, such as hepatic cancer, cervical cancer, gliomas, and gastric cancer. Likewise, miR-34 dysregulation is related to different psychiatric disorders, including schizophrenia, Alzheimer’s disease, and MDD.

38miRNAs have been evaluated in MDD by examining their level in peripheral blood, cerebrospinal fluid, and postmortem cortex of depressive patients and in animal models of depression.– The depression susceptibility is highly associated with the miRNA polymorphisms. In peripheral blood of depressed patients, multiple miRNAs, such as miR-330-3p, miR-345-3p, miR-425-3p, and miR-24-3p, were reportedly altered. In the prefrontal cortex (BA9) of MDD patients, other 21 miRNAs, including miR-142-5p, miR-101, miR-137, and miR-301a, was downregulated. MiRNA expression levels were also found to be altered in BA10, BA44, anterior cingulate cortex (ACC), and other brain regions in MDD. The link between miRNAs and the pathophysiology of depression– may be implicated by the fact that miRNAs regulate neuronal regulation, neurotransmitter regulation, and microglia activation.,

Neuronal regulation by miRNAs

39In depressed patients, fewer pyramidal neurons are found in the hippocampus and prefrontal cortex., Cell loss, neuronal atrophy, and alterations in synapse density are also observed in depression animal models. MiRNAs may mediate these effects in depression by influencing neuronal production, differentiation, proliferation and synaptic plasticity.

40As shown in Fig. 5, the expression of miR-124, miR-532-5p, and miR-9-5p alters in tissues from depression patients/animal models, activating signal transducer and activator of transcription 3 (STAT3) and mediating the disruption of neuronal differentiation and proliferation in depression.– Similarly, miR-26a-3p and miR-132 can induce depressive symptoms by activating the phosphatase and tensin homolog (PTEN)/phosphoinositide 3-kinase (PI3K)/Akt signaling pathway, which is one of the main pathways for regulating synaptic plasticity. Low hippocampal miR-211-5p can inhibit neuronal neurogenesis and induce depression-like behaviors via the promotion of the Dyrk1A/STAT3 signaling pathway. Low miR-218 expression may influence synapse formation and synaptic plasticity of the mPFC by repressing the gene expression of Netrin-1 guidance cue receptor gene DCC in mouse models of social defeat stress. These data demonstrate the crucial role of miRNAs in neuronal differentiation, production, and maintenance.

miRNAs regulate neuroglial cells

41The peripheral and central nervous systems (CNS) both contain neuroglial cells, such as microglia, astrocytes, and oligodendrocytes. The neuroglial cells serve as the first line of defense for the brain, not only by recognizing pathogens and repairing damaged tissue but also by secreting neurotrophic factors and producing chemokines and cytokines. Chronic unpredictable stress (CUS) model mice showed changes in neuroglial numbers and morphologies in the hippocampus. Postmortem studies of MDD cases show deficits in neuroglial numbers in the neocortex. Therefore, the occurrence and development of depression may be associated with neuroglial cells.

42The protein WNT2 plays pivotal role in embryonic development, the adult hippocampal neurogenesis, and development of the nervous system. In depression, more miR-199a-5p was noted in microglia suppressing WNT2 expression through the CREB/BDNF signaling regulation. The downregulation of miR-124 in depression also promotes the activation of BV2 microglia by activating STAT3. This increases inducible nitric oxide synthase and proinflammatory cytokine (MCP-1, IL-6, TNF-α, and IL-1β) secreted by BV2 cells, which induces depressive symptoms. In addition, miR-146a-5p is transferred by microglia to the hippocampus DG, where it targets Krüppel-like factor 4 (KLF4) and inhibits neurogenesis and the spontaneous discharge of excitatory neurons.

Regulation of neurotransmitters by miRNAs

43Studies have shown that miRNA-mediated disturbance of neurotransmitters, including glutamate, dopamine, serotonin and norepinephrine, can lead to neuronal damage, and loss of trophic effects and thereby potentially contribute to the pathogenesis of depression.– Glutamate and its receptors are associated with many neuropsychiatric illnesses, including depression., MiR-335, miR-1202, miR-29b-3p, and miR-134-5p may regulate depression through inhibiting the expression of GRM4 gene (Fig. 5), that in turn affect the influx of Ca2+ into the prefrontal cortex neurons and the extracellular concentration of glutamate.– The monoamine oxidase A (MAO-A) enzyme modulates monoamine neurotransmitter levels. miR-142, miR-34a, and miR-34c indirectly regulate MAO-A, potentially impacting monoamine neurotransmitters. In addition, miR-16 upregulation in depression inhibits the translation of the serotonin transporter (SERT) gene, affecting serotonin function in the hippocampus.,

circRNAs engage in the development of MDD

44circRNAs are covalently closed circular RNA molecules that typically contain exons, formed by direct splicing 3′ and 5′ terminal ends generated from precursor mRNA., These RNA molecules function as a class of post-transcriptional regulators. Typically, circRNAs regulate the expression levels of downstream genes at several levels, including mRNA transcription, splicing, and translation. In addition, it has been reported that some circRNAs can translate to peptides. Several studies have demonstrated that circRNAs are abundantly expressed in the brain. And also, circRNAs are involved in the pathogenesis of neuropsychiatric disorders, impacting neuron development, cognitive function, and synaptic plasticity–.

Neuronal regulation by circRNAs

45CircRNAs involve in regulating central neural system development. They are highly expressed in the brain from the embryonic stage to adulthood and substantially upregulated during the differentiation and maturation of neurons. Many circRNAs are significantly upregulated at different time points of neuron maturation in vitro. In vitro studies have shown that overexpression of circPTK2 can induce neuronal apoptosis via miR-29b inhibition, preventing inflammatory response and protecting against neuronal apoptosis. Conversely, circPTK2 silencing inhibited JAK2/STAT3 and decreased IL-1β, thereby ensuring neuronal survival.

circRNAs regulate neuroglial cells

46It was reported that cirRNAs regulate neuroglial activities. For example, one study revealed that the gut microbiota-circHIPK2-astrocyte axis was involved in the development of depression in a stress mouse model. Fecal microbiota transplantation significantly alleviated astrocyte dysfunction and depression-like behaviors in recipient depressive mice via inhibition of circHIPK2 expression. Similarly, another study demonstrated that overexpression of circSTAG1 significantly ameliorated depression-like behaviors and astrocyte dysfunction in the stress mice model. In addition, a recent study using two different MDD mouse models demonstrated the presence of a close relationship between depression and decreased circDYM and revealed that increased circDYM expression could significantly attenuate depressive-like behavior and inhibit microglial activity.

Regulation of neurotransmitters and synaptic plasticity by circRNAs

47circRNAs were also observed to be linked to neurotransmitter function and synaptic plasticity and have a higher expression in the neuropil area compared to their mRNA isoforms. Studies have shown many host genes of circRNA were enriched in the pathway of synaptic activities and neurotransmitter secretion.,, For instance, circHomer1 derived from the homer scaffolding protein 1 pre-RNA can regulate some synaptic structure during the development and neuronal plasticity. Furthermore, a study using a murine cell line model of Huntington’s disease identified 23 differentially expressed circRNAs significantly enriched in the MAPK, dopaminergic synapse, and long-term depression pathways.

lncRNAs participate in the process of depression

48lncRNAs are more than 200 nucleotides in length and cannot encode proteins, but they share some characteristics with messenger RNAs. lncRNAs, for instance, are transcribed by RNA polymerase II; they are 5′ capped with a polyA tail and have multiple exons. Because of their lack of conservation across species and lower expression levels than mRNAs, lncRNAs were initially regarded as transcriptional noise or junk. However, some long noncoding RNAs are involved in regulating gene expression, including transcriptional regulation, RNA regulation, chromatin modification, and posttranscriptional regulation of protein activity and localization.

49Highly expression of lncRNAs in the brain is crucial for maintaining neural stem cells, neurogenesis, neural plasticity and cognitive function, etc. For example, brain cytoplasmic lncRNA (BC1), one of the earliest lncRNAs studied in the brain, regulates metabotropic receptor signaling. In addition, neurogenesis-associated lncRNAs may act as guides for proteins associated with neurogenesis, including REST, SOX2 and SUZ12. Furthermore, RNAi knockdown of some lncRNAs impairs neuronal differentiation, suggesting that lncRNAs play critical roles in neurogenesis. Several recent studies have indicated that lncRNAs are crucial in the development of numerous neurological disorders, including autism, schizophrenia, and depression.– However, further research is needed to determine their signal pathway targets and regulation.

50Levels of 60% (217 out of 364) of the 364 lncRNAs expressed in the rostral cingulate cortex of normal individuals differed from those in MDD. Using whole-genome sequencing, a recent study found that lncRNAs accounted for 30% of the differences between patients with depression and control populations. In MDD patients, four lncRNAs (PCAT1, MER11C, Y5, and PCAT29) levels were higher, and one lncRNA (RMRP) was lower in peripheral blood leukocytes.

Regulation of neuronal cells by lncRNAs

51In MDD patients, LncRNA TCONS 00019174 levels were lower, and phosphorylated-GSK3 and -catenin was higher in the hippocampus, potentially causing neuronal damage. Furthermore, viral-mediated overexpression of lncRNA TCONS 00019174 aggravated depression status in depressed mice model, indicating that lncRNA TCONS 00019174 may be linked to the pathogenesis of depression. Differentially expressed lncRNAs showed correlations with 18 synapse-related functions, which showed that lncRNA-directed regulatory machinery might mediate synaptic dysfunction in depression.

Regulation of neuroglial cell by lncRNAs

52Administration of lncRNAs can treat depression at the neuroglial cell level, which promotes the pathogenesis of depression. More M1 microglia were found in the hippocampus of depressed rats and fewer M2 microglia, as well as a negative regulation factor of the lncRNA uc.80. Elevated expression of lncRNA uc.80 can reduce depression-like behaviors in rats and hippocampal neuron apoptosis in vitro and in vivo. Consequently, lncRNA uc.80 may be a potential target of treatment for depression.

Neurotransmitters regulated by lncRNAs

53Researchers have shown that upregulated lncRNA NONHSAG045500 inhibits the expression of the 5-HT transporter SERT which influences 5-HT transmission in depression. Meanwhile, the concentration of 5-HT was increased by interference with the levels of NONHSAG045500. NONHSAG045500 may modify the transport of monoamine neurotransmitters.

Effective antidepressant treatment is associated with ncRNA alteration

54There are approximately six major classes of antidepressants used worldwide. Classical antidepressants include the noradrenaline reuptake inhibitors (NRIs), selective serotonin reuptake inhibitors (SSRIs), combination serotonin and norepinephrine reuptake inhibitors (SNRIs), and older drugs like tricyclic antidepressants and monoamine oxidase inhibitors., New-generation antipsychotics and drugs targeting the alpha2-adrenergic autoreceptor like mirtazapine are also used. In 2019, the Food and Drug Administration in the United States approved Ketamine, a newer medication for patients with depression and suicidal tendencies not responding to standard antidepressants. It is reported that almost 60% of patients fail to recover after undergoing one antidepressant trial,– and misleading reviews have ignored a vast body of efficacy data and even questioned whether antidepressants work at all., Accordingly, a better understanding of how antidepressants work and why they do not work in some patients is needed. Some evidence suggests that SSRIs, SNRIs, or ketamine may exert their influence by affecting miRNAs.,–

Noncoding RNA modulation in response to SSRIs

55Application of escitalopram in depression of patients altered the levels of 30 miRNAs, have triggered studies finding that miRNAs may be downstream regulators mediating the antidepressant effects of SSRIs.

56Fluoxetine upregulated the expression of miR-16 in the raphe nucleus of mouse, and downregulated miR-598-5p and miR-451 in hippocampus of mouse brain. In vitro, fluoxetine upregulated miR-320a, miR-663a, miR-572, and miR-489 in both SK-N-SH and SHSY5Y cell lines. In addition, fluoxetine can regulate hippocampal lncRNA levels to improve CUMS-induced depression symptomatology. Among them, lncRNA Gm26917 was significantly upregulated. Paroxetine upregulated the expression of miRNA-451a and downregulated the expression of miRNA-221-3p and miRNA-34a-5p. A relationship is reported between clinical symptom changes and miRNA expression levels. Higher miR-1202 levels in MDD patients are reported following eight weeks of citalopram, but no differences in controls. Plasma miR-132 levels MDD were reduced after two months of citalopram and plasma miR-124 levels increased. Citalopram increased miRNA-16 in mouse brains and decreased SERT protein levels, while exerting antidepressant effects. 30 miRNAs were expressed differently in the blood of MDD patients following three months of escitalopram therapy. Escitalopram administration for four weeks normalized abnormal levels of miR-326 in the NAc of depressed rats, indicating that miR-326 may be a novel target of escitalopram. The problem with most studies is that they cannot distinguish between miRNA normalization as part of the antidepressant action or miRNA normalization as a consequence of clinical improvement in the patient.

Noncoding RNA modulation in response to SNRIs

57It has been suggested that SNRIs have better therapeutic efficacy and higher tolerability compared to commonly used antidepressants since of their impact on both norepinephrine (NE) and 5-HT.– One of the SNRIs widely used in clinical settings is duloxetine. Downregulation of miR-3074-5p, miR-146a-5p, miR-24-3p, miR-425-3p, and miR-146b-5p expression in the peripheral blood of depression patients after duloxetine treatment was found. Administration of duloxetine to rats undergoing CUMS upregulated miR-18a and miR-132 in hippocampus, and downregulated levels of miR-124a and miR-134. Desvenlafaxine reduced miR-1202 levels in depressed individuals after two months of treatment. Furthermore, miR-1202 levels in peripheral blood were associated with alterations in brain activity and connectivity in several brain regions. Perhaps miR-1202 levels may mediate some of the desvenlafaxine’s antidepressant effect through brain circuitry function, possibly via the glutamatergic system.

Noncoding RNA modulation in response to ketamine for depression

58Ketamine inhibits the N-methyl-D-aspartate (NMDA) receptor, enhances mushroom spine growth in 1–2 days via the mTOR pathway and is known to reduce depression symptoms quickly and robustly. Ketamine downregulated 18 miRNAs levels and upregulated 22 miRNAs levels in rats. MiR-206 suppressed ketamine’s ability to up-graduate BDNF expression and is downregulated by ketamine. Thus, miRNA-206 may moderate ketamine’s antidepressant effect. Ketamine can also increase the expression of miR-29b-3p and result in lower levels of metabotropic glutamate receptor 4 (GRM4) in the prefrontal cortex of depressed rat model, suggesting that the lncRNA Gm26917/miR29b-3p/GRM4 pathway may plays a critical role in both fluoxetine and ketamine therapies in CUMS rats. Understanding how lncRNA regulation is related to antidepressant treatment effects has become increasingly important to find potential therapeutic targets to improve the treatment of MDD.

RNA modifications participate in the molecular mechanisms underpinning MDD

59There are over 100 types of RNA modifications. Due to their ubiquitous role in cell biology, RNA modifications have been associated with the development of various illnesses, such as cancer, neurological and developmental disorders, and metabolic diseases. To date, among all RNA modifications, N6-methyladenosine (m6A) accounts for two-thirds of all RNA modifications that can be “written”, “read”, and “erased” via the actions of a complex network of proteins, and has been widely studied since it was discovered and proposed by Desrosiers in 1975. M6A is a methylation modification of the N at the sixth position of adenosine, which exists not only in mRNA, but also in tRNA, rRNA, and lncRNA. m6A interacts with different reading proteins and related complexes to broadly influence gene expression at multiple levels. There are also many m6A modification sites on the mRNA of some proteins that regulate histone modification. Therefore, inhibition of the m6A-regulating enzymes may result in increased or decreased histone modification levels. Here, we review prospective evidence concerning the involvement of RNA modifications, especially m6A, in the pathogenesis of depression (Fig. 6), drawing on studies from different species and multiple experimental designs. We discuss the biological effects of RNA modifications in pharmacological and nonpharmacological antidepressant therapies.

Writers

60Scientists have previously shown that the consensus recognition sites for methyltransferase complexes are highly conserved in most eukaryotes. Core m6A methyltransferase complex components include methyltransferase-like 14 (METTL14), Wilms tumor 1-associated protein (WTAP), methyltransferase-like 3 (METTL3), and RNA-binding motif protein 15 (RBM15). The complex employs S-adenosine methionine (SAM) as a methyl donor to catalyze the formation of methyl groups on the sixth nitrogen element of adenine present in RNA. As the earliest identified component of m6A methyltransferase-possessing methylation catalysts, METTL3 plays a role in neural development, and its absence causes hypoplasia of the cerebellum in mice, resulting in ataxia. METTL3 catalyzes the m6A modification of the low-density lipoprotein receptor-related protein 2 (LRP2) mRNA to improve its stability and efficiency in translation. This process relies on reader protein YTH domain containing 2 (Ythdc2), thereby facilitating neurogenesis. A deficit of METTL3 in mice lessens hippocampal neurogenesis, which induces spatial memory decline, and depression-like behaviors. Targeting the METTL3-Ythdc2-LRP2 axis to regulate neurogenesis may be a promising antidepressant strategy. Evidence from other studies suggests that upregulated METTL3 can aggravate cognitive impairment in rats exposed to CUMS by mediating m6A modification to promote the processing and maturation of pri-miR-221. In addition, this upregulation of METTL3 could increase miR221-3p levels, leading to growth factor receptor-bound protein 2 associated binding protein 1 (Gab1s) inhibition.

Erasers

61RNA modifications are removed by demethylases, allowing dynamic adjustment. The m6A erasers associated with mental stress disorders primarily consist of fat mass and obesity-associated protein (FTO) and Alkb homolog 5 (ALKBH5). The FTO variant rs9939609 in human trials was associated with a lower risk of developing MDD. A correlation is reported between FTO variants and the severity of MDD. Lack of the FTO gene impacts anxiety-depression-like behavior in mice. Adrenoceptor 2 (Adrb2) mRNA appears to be a target of FTO. FTO expression is also related to cognition. Activation of circadian regulator cryptochrome 1 and 2 to inhibit FTO transcription, which in turn inhibits the expression of TrκB in the hippocampus through m6A-dependent posttranscriptional regulation, resulted in impaired cognition in mice. Anxiety-like and depression-like behavior induced by peripheral nerve injury could be reversed in mice by blocking FTO downregulation in the anterior cingulate cortex. The m6A demethylase gene ALKBH5 variant rs12936694 showed an allelic association and genotypic association with MDD., Huang et al. reported that circular RNA STAG (circSTAG1) overexpression hindered the translocation of ALKBH5 into the nucleus, leading to elevated m6A methylation of fatty acid amide hydrolase (FAAH) mRNA and degradation of FAAH in astrocytes followed by reduced depression-like behavior and reduced astrocyte loss.

Readers

62Readers can identify modification signals that react to RNA output, splicing, translation, and degradation by preventing the writer or eraser from adding the modified base, or by recruiting other RNA-binding proteins to facilitate the chemical modification of the RNA. The heterogeneous nuclear ribonucleoprotein (HNRNP) protein family, YT521-B homology domain family (YTHDF), insulin-like growth factor 2 mRNA binding proteins (IGF2BPs) and eukaryotic initiation factor 3 (eIF3) are all members of the “reader” subfamily of m6A modification enzymes. According to a previous study, the HNRNP proteins HNRNPA2B1 and HNRNPC exhibit selective binding to mRNAs containing m6A., HNRNPA2B1 may be one of eight genes associated with postpartum depression and may have diagnostic value. By accelerating the translation of specific transcripts in the adult mouse hippocampus, YTHDF1 enhances learning and memory of neuronal stimuli, whereas its absence affects synaptic transmission and long-term enhancement in the hippocampus, leading to deficiencies in learning and memory.

RNA modifications other than m6A are also involved in depression

63RNA modifications other than m6A have been poorly studied in the field of depression with scant coverage of modifications such as N4-acetylcytidine (ac4C) and 5-methylcytosine (m5C). N-acetyltransferase 10 (NAT10) is a member of the general control non-repressible 5 (GCN5)-related N-acetyltransferase (GNAT) family involved in epigenetic events. It can regulate mRNA translation efficiency by catalyzing the addition of ac4C to the N4 position on thymidines. In a study conducted on mice, chronic mild stress (CMS) was used to trigger anxiety and depression-like behavior, and the results indicated an increase in NAT10 expression in the hippocampus following the administration of CMS. Pharmacological methods prevented NAT10’s anti-anxiety and antidepressant-like effects. As one of the most abundant modifications on tRNA and rRNA, m5C is enzymatically catalyzed by members of the NOL1/NOP2/SUN domain (NSUN) family and DNA methyltransferase homolog DNMT2. By altering the translational dynamics of Glycine (Gly)-rich synaptic proteins, the impaired cortical NSUN2, which is a tRNA methyltransferase, exerts bidirectional impacts on tRNA methylation and induces depression-like behavior in the mouse brain.

Antidepressant treatments are associated with RNA modification

64Altered epigenetic modification of m6A mRNA may contribute to therapeutic responses in psychiatric disorders. The complex protein network that maintains the m6A homeostasis can also be served as therapeutic target for depression potentially. Altered levels of RNA demethylase, the “erasers”, are the most frequently reported m6A-regulating enzymes associated with antidepressant effects. Tricyclic antidepressants increase FTO expression and activate its epigenetic function in the VTA; eliminating m6A modification in the VTA is postulated to cause an antidepressant effect. Moreover, activation of FTO in the hippocampus relieves depression-like behaviors and reduces the density of dendritic spines and the number of branches in mice induced by chronic restraint stress, improving the synaptic plasticity. In contrast, only a few studies reported the association between the writer and the eraser protein and effects of antidepressants. One study found that physical exercise alleviates anxiety-like behaviors and restores m6A levels in mouse medial prefrontal cortex; the restoration of m6A is related to increased expression of RNA Methylase (i.e., METTL3, METTL14, METTL16) and downregulation of RNA demethylase (i.e., ALKBH5), as well as upregulated expression of the RNA-binding factor YTHDF3. Another study showed that NAc-deep brain stimulation (DBS) could reverse the impacts of CUMS on gene expression and m6A-mRNA modification for certain genes, but the m6A-regulating enzymes were not detected.

Chromatin remodeling factor alteration is associated with MDD

65Modifying chromatin structure by ATP-dependent protein complexes is also recognized as an essential epigenetic process. These protein complexes depend on ATP hydrolysis to control the histone arrangement, steering a dynamic process of DNA accessibility. ATP-dependent complexes can be classified into four groups (referring to the specificity of distinct ATPase subunits): switch/sucrose nonfermentable (SWI/SNF), imitation switch (ISWI), inositol (INO80) and chromodomain helicase DNA-binding (CHD)., Among these, ATP-utilizing chromatin assembly and remodeling factors (ACF) are the most extensively studied protein complexes of the ISWI family. It consists of various subunits, including the bromodomain adjacent to zinc finger domain 1A (BAZ1A). Mice with ACF overexpression in NAc exhibit depression-like behaviors after social defeat stress. This study also showed that ACF overexpression regulates nucleosome architecture at transcriptional start sites, inhibiting the expression of a subset of genes, and increases susceptibility to stress-induced depression in mice and humans. The inactivation of ATPase subunit of the SWI/SNF complexes, Brahma Related Gene 1, reduces the expression of stress- and cocaine-induced immediate early genes, increases heterochromatin levels, and generally reduces chromatin accessibility in striatal medium spiny neurons. Other studies reported altered levels of selective ATP-dependent chromatin remodeling factors in mice with high anxiety-related behavior, including SNF2H in the amygdala and CHD3 and CHD5 in the ventral hippocampus. However, the impact of ATP-dependent nucleosome remodeling complexes on depression is not well-understood, and more research is needed to explore this area.

A translational perspective on epigenetic modifications in MDD

66The molecular machinery and epigenetic mechanisms related to MDD have become more understood; it is possible to test whether these epigenetic alterations have the translational potential to diagnose and aid in the treatment of MDD. Therapeutic strategies targeting writers, erasers and readers of different epigenetic components hold promise in the context of major depression and related cognitive impairments (Fig. 7).

Biomarkers for the diagnosis of depression

67Large numbers of clinical trials are currently in progress to determine whether DNA methylation, miRNAs and lncRNAs are biomarkers for different types of cancer,– perhaps profiles of such molecules could also be used for diagnosing depression., It is imperative that a biomarker for the diagnosis of depression be specific for MDD, determined by whether it is a state or trait marker and whether it is affected by antidepressant treatments. Since blood samples can be collected easily, they are attractive options for diagnostic biomarkers., Because miRNA and lncRNA levels in blood distinguish depressed patients from healthy controls,,, for a diagnostic tool, it is not essential if blood and brain exhibit significant similarities., Results are summarized in Table 2.

Biomarkers for predicting the response to antidepressant treatment

68The ideal epigenetic molecular marker for antidepressant treatment should satisfy three conditions: (1) the expression level in the blood changes significantly after taking antidepressant drugs; (2) the expression level in the brain tissue changes significantly after taking antidepressant drugs; and (3) the molecular mechanism(s) of DNAm/ncRNA-mediated antidepressant effects have been clarified. However, the key elements for a convenient blood-based biomarker, are that it shows a robust relationship to clinical response. We summarize the DNAm/ncRNAs findings in blood or brain tissue related to antidepressant response in Table 3. The findings suggest that some epigenetic marks could be helpful in predicting responses to psychotherapeutic intervention.–

Drugs interfering with epigenetic mechanisms as potential antidepressants

69Several antidepressants targeting DNA methylation are in clinical development, including quetiapine (drug repurposing), S-adenosyl methionine, and cannabidiol.

Quetiapine

70An atypical antipsychotic, quetiapine, exerts an antidepressant effect and has the protective effect of reducing epigenetic changes induced by stress in early life. Rats with maternal deprivation showed depression-like behavior in the forced swimming test (FST), and increased activity of HDACs and DNMTs in the hippocampus and NAc. Quetiapine reversed depression-like behavior in mice and reduced DNMT activity in the hippocampal region.

S-adenosyl methionine

71S-adenosylmethionine (SAM) serves as a methyl donor with a broad range of applicability and is occasionally administered to individuals who exhibit unresponsiveness to primary antidepressant treatments. The anti-inflammatory actions of SAM might be beneficial in treating depression. SAM controls the activation of inflammatory genes by inducing changes in DNA methylation at specific gene promoters. SAM reduces the expression of the proinflammatory cytokine TNFa and the chemoattractant CCL2 and its receptor CCR2, in association with DNA methylation changes in specific gene promotor. In contrast, DNA methylation by SAM increases IL-10 expression, an anti-inflammatory cytokine.

Cannabidiol

72Cannabidiol (CBD) is cannabis’ most abundant non-psychoactive component. CBD’s therapeutic potential for reducing depression-like behavior has been shown, since it interacts with a wide range of brain molecules,. In one study, stress induced by FST increased levels of global DNA methylation levels and DNMT activity in the hippocampus while decreasing DNA methylation and DNMT activity in the prefrontal cortex. Interestingly, CBD administration prevented stress-induced epigenetic changes in both the hippocampus and PFC. A preliminary study reported that several histone modifications were changed in some brain regions of rats after CBD administration. But the molecular mechanism of CBD action remains to be investigated.

DNMT inhibitor

73Different DNMT inhibitors (DNMTi) inhibit DNMTs through different mechanisms, including nucleosides and nonnucleosides. Nucleosidic DNMTi, including 5-AzaC, 5-AzaD, and zebularine, are chemical analogs of cytidine, which are integrated into DNA molecules during replication (S-phase). Their covalent binding to the DNMTs prevents DNA methylation and irreversibly blocks these enzymes. It has been demonstrated that 5-AzaD and 5-AzaC lead to a decrease in DNA methylation and increased BDNF expression in the hippocampus, displaying effects similar to those of antidepressants in several preclinical settings. In addition, injecting zebularine into the cerebral ventricles of adult rats for seven days reduced DNA methylation of the BDNF promoter. The reduced methylation of the promoter enabled this drug regimen to restore BDNF expression, suggesting the potential of zebularine as a therapeutic agent in clinical use. Some nonnucleoside inhibitors, such as RG108 and procaine, have different mechanisms of action, including noncovalent inhibition within the DNA catalytic sites, to impede enzymatic activity. RG108 alters stress-induced DNA methylation bidirectionally in the hippocampus and PFC and triggers antidepressant-like effects as demonstrated in the forced swimming test.

74The therapeutic potential of HDAC inhibitors (HDACis) is suggested because HDACis may augment the efficacy of antipsychotic medications on coadministration., Animal models and postmortem brain results show some HDACis exert antidepressant-like effects (Table 4, Fig. 7). HDACis, such as sodium butyrate and SAHA, promote cognitive function, and may provide therapeutic options for depressed patients with cognitive impairment.– Although medications targeting these epigenetic molecules are proving effective in preclinical animal studies, there is a lack of successful clinical trials of HDACi in neuropsychiatric disorders, perhaps because of the complexity of different HDAC isoforms (i.e., HDAC2 and HDAC5) that are associated with pro-depressant and antidepressant functions. The complexity is further heightened because HDAC and DNMT are widely distributed in the CNS and peripheral tissues. Interference in nonneuronal or inappropriate neuronal locations may induce side effects and off-target effects. Drugs that target brain tissue-specific epigenetic modulators may ultimately prove to be helpful new therapies for depression, but the studies that show this remain to be done.

Concluding remarks and future directions

75Environmental stressors and genetic factors shape the complex phenotype of MDD. Specifically, epigenetic processes shape and store a cell’s molecular response to its environment. The prevailing hypothesis suggests that epigenetic processes leave imprints on the genome, which then interact with an individual’s genetic predisposition to determine their susceptibility to depression over the course of their lifetime. Therefore, exploring epigenetic mechanisms provides fresh perspectives on the pathophysiology of MDD and has the potential to generate innovative biomarkers for diagnosis and treatment purposes. Established animal models for depression and video-recorded behavior analyses have greatly advanced the understanding of various epigenetic mechanisms contributing to stress responses, neuroplasticity, neurotransmission, and neuroglial function. Clinical studies have focused on DNA methylation and ncRNA using human peripheral blood samples, with few focusing on histone modifications. As MDD is a stress-related neuropsychiatric disorder, validating the employment of peripheral epigenetic molecular alterations as surrogates for what occurs in the brain does not advance our knowledge of pathogenesis. Still, it may be useful in developing biomarkers of disease and treatment response.

76Innovative approaches are necessary to enhance our understanding of the pathogenesis in the brain. Fluorescence-activated cell sorting techniques and single-cell epigenomics can facilitate the examination of DNA methylation various cell types., Likewise, although the patterns of histone modification usually differ between cell types, most studies conducted have examined these modifications in cell populations that are heterogeneous. A high priority for future studies is to probe the epigenetic landscape by integrating modern low and single-cell technologies in combination with next-generation sequencing, to simultaneously measure multiple molecules such as proteins and RNAs, DNA methylation, or chromatin accessibility.,

77Some types of epigenetic modifications, such as changes in chromosome conformation are still largely unexplored in MDD., The chromosome conformation capture (Hi-C) technique can provide information on the 3D chromosome conformation and uncover the interactions between distant genomic regions that affect gene expression. The transposase-accessible chromatin sequencing (ATAC-Seq) assay is also a powerful tool for investigating genome-wide chromatin accessibility., Recent MeRIP-Seq methods map the m6A-methylated RNA, offering a new way to explore the transcriptome-wide location of m6A in MDD. Combined with the widely used next-generation RNA sequencing techniques, these techniques for exploring the epigenome may facilitate a more comprehensive understanding of the possible mechanisms that contribute to MDD.

78Epigenetic processes require a pool of metabolites, such as acetyl-CoA for histone acetylation and S-adenosyl-methionine for methylation. Recent studies provide evidence for metabolic signaling to chromatin in the brain. Lactate-dependent histone lactylation (H4K12a) in microglia promotes the expression of glycolytic genes, leading to microglial dysfunction and cognitive decline. Additional research is required to investigate epigenetic pathways that are dependent on metabolism, in the pathogenesis of depression and its potential to mimic the effects of antidepressants. In addition, several studies have established an association between the gut microbiome, the metabolites of the gut flora and epigenetics, revealing the impact of the gut microbiota on ncRNA production., Extensive evidence demonstrates that the brain-gut-microbiota axis plays a crucial role in the pathophysiology of MDD and other psychiatric disorders., Hence, investigating the effects of the combination of the gut microbiome and epigenetic modification could potentially shed light on the underlying mechanisms of depression.

79Finally, manipulating targeted epigenetic states is crucial to gain a comprehensive understanding of the effects of stress-induced histone mark alterations. As mentioned above, the clinical adaptation of HDAC/DNMT inhibitors is severely constrained by their off-target effects. For example, the true causality of epigenetic signatures at DNA sites that are known to be involved in stress-related disorders can only be examined with the advent of novel mutagenesis tools such as Clustered Regularly Interspaced Short Palindromic Repeats (CRISPR-Cas9) and Transcription Activator-Like Effector Nucleases (TALENs)., These technologies facilitate the targeting of epigenetic modifiers to specific genes, brain regions, and time frames to ascertain whether the regulation of epigenetic modifications at a particular locus is accountable for a certain psychiatric disorders. The use of CRISPR/Cas9 system enables regulation of gene expression and make epigenetic alterations without introducing DNA double-strand breaks. Furthermore, CRISPR-cas9 system can trans-epigenetic remodel the endogenous gene. Recently, a new set of epigenetic editor CRISPRoff has been developed, enabling persistent, heritable, and reversible DNA methylation modification and regulation of gene transcription. These tools specifically allow the targeting, cutting, and replacing a specific epigenetic-related gene to explore the gene functions in psychiatric disorders. It is believed leveraging these tools can help elucidate more potential epigenetic mechanisms in MDD.

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Targeting epigenetic and posttranslational modifications regulating ferroptosis for the treatment of diseases · 2023
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