title: Dynamics of 5-hydroxymethylcytosine during mouse spermatogenesis.
abstract: Little is known about how patterns of DNA methylation change during mammalian spermatogenesis. 5 hmC has been recognized as a stable intermediate of DNA demethylation with potential regulatory functions in the mammalian genome. However, its global pattern in germ cells has yet to be addressed. Here, we first conducted absolute quantification of 5 hmC in eight consecutive types of mouse spermatogenic cells using liquid chromatography-tandem mass spectrometry, and then mapped its distributions in various genomic regions using our chemical labeling and enrichment method coupled with deep sequencing. We found that 5 hmC mapped differentially to and changed dynamically in genomic regions related to expression regulation of protein-coding genes, piRNA precursor genes and repetitive elements. Moreover, 5 hmC content correlated with the levels of various transcripts quantified by RNA-seq. These results suggest that the highly ordered alterations of 5 hmC in the mouse genome are potentially crucial for the differentiation of spermatogenic cells.
authors.affiliation: State Key Laboratory of Reproductive Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing 100080, China.
authors.forename: Haiyun
authors.initials: H
authors.lastname: Gan
authors.forename: Lu
authors.initials: L
authors.lastname: Wen
authors.forename: Shangying
authors.initials: S
authors.lastname: Liao
authors.forename: Xiwen
authors.initials: X
authors.lastname: Lin
authors.forename: Tingting
authors.initials: T
authors.lastname: Ma
authors.forename: Jun
authors.initials: J
authors.lastname: Liu
authors.forename: Chun-Xiao
authors.initials: CX
authors.lastname: Song
authors.forename: Min
authors.initials: M
authors.lastname: Wang
authors.forename: Chuan
authors.initials: C
authors.lastname: He
authors.forename: Chunsheng
authors.initials: C
authors.lastname: Han
authors.forename: Fuchou
authors.initials: F
authors.lastname: Tang
mesh_terms: D044503:5-Methylcytosine / Q000031:analogs & derivatives; D000818:Animals; D002469:Cell Separation; D048430:Cell Shape; D002843:Chromatin / Q000378:metabolism; D033481:Chromosomes, Mammalian / Q000378:metabolism; D003596:Cytosine / Q000031:analogs & derivatives* / Q000378:metabolism; D004268:DNA-Binding Proteins / Q000378:metabolism; D015536:Down-Regulation / Q000235:genetics; D005260:Female; D020869:Gene Expression Profiling; D016678:Genome / Q000235:genetics; D008297:Male; D051379:Mice; D008858:Microscopy, Phase-Contrast; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D012091:Repetitive Sequences, Nucleic Acid / Q000235:genetics; D012730:Sex Chromosomes / Q000378:metabolism; D013091:Spermatogenesis / Q000235:genetics*; D013094:Spermatozoa / Q000166:cytology / Q000378:metabolism; D059467:Transcriptome / Q000235:genetics; D015854:Up-Regulation / Q000235:genetics
chemical_list: D002843:Chromatin; D004268:DNA-Binding Proteins; D012333:RNA, Messenger; C011865:5-hydroxymethylcytosine; D044503:5-Methylcytosine; D003596:Cytosine