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Detection of Modified Forms of Cytosine Using Sensitive Immunohistochemistry
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Characterizing 5-hydroxymethylcytosine in human prefrontal cortex at single base resolution.

Jeffrey A Gross1, Alain Pacis2,3, Gary G Chen4

  • 1McGill Group for Suicide Studies, Douglas Mental Health University Institute, 6875 boul. Lasalle, Montreal, Quebec, Canada. jeffrey.gross@mail.mcgill.ca.

BMC Genomics
|September 4, 2015
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Summary

5-hydroxymethylcytosine (5hmC) is a key epigenetic mark in the brain. This study maps 5hmC across the human prefrontal cortex, revealing its association with active gene transcription and regulatory elements.

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Area of Science:

  • Epigenetics
  • Genomics
  • Neuroscience

Background:

  • Methylated cytosines are converted to 5-hydroxymethylated cytosines (5hmC) by ten-eleven translocation enzymes.
  • 5hmC is an epigenetic mark with significant interest due to its genomic location, abundance, functions, and stability.
  • 5hmC plays a crucial role in the brain, exhibiting abundance and dynamism during development.

Purpose of the Study:

  • To comprehensively characterize the genomic location and abundance of 5hmC in the human prefrontal cortex.
  • To investigate the transcriptional regulatory properties and genomic associations of 5hmC.
  • To identify gender-specific 5hmC patterns.

Main Methods:

  • Genome-wide characterization of 5hmC in 24 human prefrontal cortex samples.
  • Analysis of 5hmC distribution across autosomal and sex chromosomes.
  • Correlation analysis of 5hmC density with enhancer regions, exons, histone modifications, and gene transcription.

Main Results:

  • Approximately 8% of CpGs on autosomal chromosomes contain 5hmC, with lower abundance on sex chromosomes.
  • 5hmC density is highest in enhancer regions and exons, suggesting transcriptional regulatory roles.
  • Increased 5hmC density is linked to histone modification sites, actively transcribed gene bodies, and exon-intron boundaries.
  • Several genomic regions with gender-specific 5hmC were identified.

Conclusions:

  • This study provides a comprehensive reference map of 5hmC in the human prefrontal cortex.
  • The findings highlight the association of 5hmC with active transcription and regulatory elements.
  • This work serves as a valuable resource for research into the role of 5hmC in brain function and disorders.