Long exposure to mature ooplasm can alter DNA methylation at imprinted loci in non-growing oocytes but not in prospermatogonia

Yayoi Obata, Takuya Wakai, Satoshi Hara, Tomohiro Kono

研究成果査読

2 被引用数 (Scopus)

抄録

DNA methylation imprints that are established in spermatogenesis and oogenesis are essential for functional gametes. However, the mechanisms underlying gamete-specific imprinting remain unclear. In this study, we investigated whether male and female gametes derived from newborn mice are epigenetically plastic and whether DNA methylation imprints are influenced by the niche surrounding the nuclei of the gametes. When prospermatogonia possessing sperm-specific DNA methylation imprints were fused with enucleated fully grown oocytes and exposed to the ooplasm for 5-6 days, the DNA methylation status of the reconstituted oocytes remained identical to that of prospermatogonia for all the imprinted regions analysed. These results suggest that the imprinting status of prospermatogonia is stable and that the epigenome of prospermatogonia loses sexual plasticity. By contrast, when non-growing oocytes lacking oocytespecific DNA methylation imprints were fused with enucleated fully grown oocytes and the reconstituted oocytes were then cultured for 5-6 days, the Igf2r, Kcnq1ot1 and, unexpectedly, H19/Igf2 differentially methylated regions (DMRs) were methylated. Methylation imprints were entirely absent in oocytes derived from 5-day-old mice, and H19/Igf2 DMR is usually methylated only in spermatogenesis. These findings indicate that in the nuclei of non-growing oocytes the chromatin conformation changes and becomes permissive to DNA methyltransferases in some DMRs and that mechanisms for maintaining non-methylated status at the H19/Igf2 DMR are lost upon long exposure to mature ooplasm.

本文言語English
ページ(範囲)H1-H6
ジャーナルReproduction
147
1
DOI
出版ステータスPublished - 1月 2014
外部発表はい

ASJC Scopus subject areas

  • 生殖医学
  • 胎生学
  • 内分泌学
  • 産婦人科学
  • 細胞生物学

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