Cited by 79Epigenetics and DNA MethylationGenetics and Neurodevelopmental DisordersAutism Spectrum Disorder Research

Elevated 5-hydroxymethylcytosine in the Engrailed-2 (EN-2) promoter is associated with increased gene expression and decreased MeCP2 binding in autism cerebellum

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James, S J, Shpyleva, S, Melnyk, S, Pavliv, O, Pogribny, I P·2014·Translational Psychiatry

Abstract

Epigenetic mechanisms regulate programmed gene expression during prenatal neurogenesis and serve as a mediator between genetics and environment in postnatal life. The recent discovery of 5-hydroxymethylcytosine (5-hmC), with highest concentration in the brain, has added a new dimension to epigenetic regulation of neurogenesis and the development of complex behavior disorders. Here, we take a candidate gene approach to define the role 5-hmC in Engrailed-2 (EN-2) gene expression in the autism cerebellum. The EN-2 homeobox transcription factor, previously implicated in autism, is essential for normal cerebellar patterning and development. We previously reported EN-2 overexpression associated with promoter DNA hypermethylation in the autism cerebellum but because traditional DNA methylation methodology cannot distinguish 5-methylcytosine (5-mC) from 5-hmC, we now extend our investigation by quantifying global and gene-specific 5-mC and 5-hmC. Globally, 5-hmC was significantly increased in the autism cerebellum and accompanied by increases in the expression of de novo methyltransferases DNMT3A and DNMT3B, ten-eleven translocase genes TET1 and TET3, and in 8-oxo-deoxyguanosine (8-oxo-dG) content, a marker of oxidative DNA damage. Within the EN-2 promoter, there was a significant positive correlation between 5-hmC content and EN-2 gene expression. Based on reports of reduced MeCP2 affinity for 5-hmC, MeCP2 binding studies in the EN-2 promoter revealed a significant decrease in repressive MeCP2 binding that may contribute to the aberrant overexpression of EN-2. Because normal cerebellar development depends on perinatal EN-2 downregulation, the sustained postnatal overexpression suggests that a critical window of cerebellar development may have been missed in some individuals with autism with downstream developmental consequences. Epigenetic regulation of the programmed on-off switches in gene expression that occur at birth and during early brain development warrants further investigation.

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Authors
James, S. J., Shpyleva, S., Melnyk, S., Pavliv, O., & Pogribny, I. P.
Affiliations
  • Arkansas Children's Hospital (US)
  • National Center for Toxicological Research (US)
Corresponding author
James, S J
Venue
Translational Psychiatry
Published
2014-10-07
Volume
4
Issue
10
Pages
e460-e460
ISSN
2158-3188 (ISSN-L)
OpenAlex
W2092559397
Cited by
79
References
55
Citations by year
2026: 1 · 2025: 5 · 2024: 12 · 2023: 5 · 2022: 5 · 2021: 4 · 2020: 4 · 2019: 5 · 2018: 9 · 2017: 8 · 2016: 11 · 2015: 8 · 2014: 2
FWCI
3.97
Type
journal article
Language
en
Open access
Locations
  • Translational Psychiatry (publishedVersion, cc-by-nc-nd)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by-nc-nd)
  • PubMed Central (publishedVersion, cc-by-nc-nd)
  • PubMed (publishedVersion)
Funders
  • Arkansas Biosciences Institute
  • Eunice Kennedy Shriver National Institute of Child Health and Human Development (R01HD051873)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Epigenetics and DNA Methylation
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetics and Neurodevelopmental Disorders
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Autism Spectrum Disorder Research
Keywords
5-hydroxymethylcytosine, Engrailed-2, autism spectrum disorder, cerebellum, DNA methylation, DNMT3A, DNMT3B, TET1, TET3, oxidative DNA damage, homeodomain transcription factor, cerebellar development, gene expression regulation, epigenetic regulation
MeSH terms
Engrailed 2 Protein, Adolescent, Autistic Disorder, Cerebellum, Cytosine, Female, Humans, Male, Nerve Tissue Proteins, Promoter Regions, Genetic, Gene Expression, Homeodomain Proteins, 5-Methylcytosine, Methyl-CpG-Binding Protein 2

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