Comparative epigenomic profiling of the DNA methylome in mouse and Zebrafish uncovers high interspecies divergence

Chi Zhang, Yujin Hoshida, Kirsten C. Sadler

Research output: Contribution to journalArticlepeer-review

Abstract

The DNA methylation landscape is dynamically patterned during development and distinct methylation patterns distinguish healthy from diseased cells. However, whether tissue-specific methylation patterns are conserved across species is not known. We used comparative methylome analysisof base-resolution DNA methylation profiles from the liver and brain ofmouse and zebrafish generated by reduced representation bisulfite sequencing to identify the conserved and divergent aspects of the methylome in these commonly used vertebrate model organisms. On average, 24% of CpGs are methylated in mouse livers and the pattern of methylation was highly concordant among four male mice from two different strains. The same level of methylation (24.2%) was identified in mouse brain. In striking contrast, zebrafish had 63 and 70% of CpG methylation in the liver and brain, respectively. This is attributed, in part, to the higher percentage of the zebrafish genome occupied by transposable elements (52% vs. 45%in mice). Thus, the species identity was more significant in determining methylome patterning than was the similarity in organ function. Conserved features of the methylome across tissues and species was the exclusion of methylation from promoters and from CpG islands near transcriptionstart sites, and the clustering of methylated CpGs in gene bodies and intragenic regions. These data suggest that DNA methylation reflects species-specific genome structure, and supports the notion that DNA methylation in non-promoter regions may contribute to genome evolution.

Original languageEnglish (US)
Article number110
JournalFrontiers in Genetics
Volume7
Issue numberJUN
DOIs
StatePublished - Jun 17 2016

Keywords

  • Brain
  • Comparative epigenomics
  • DNA methylation
  • Liver
  • Mouse
  • Zebrafish

ASJC Scopus subject areas

  • Molecular Medicine
  • Genetics
  • Genetics(clinical)

Fingerprint Dive into the research topics of 'Comparative epigenomic profiling of the DNA methylome in mouse and Zebrafish uncovers high interspecies divergence'. Together they form a unique fingerprint.

Cite this