Epigenetics (Apr 2018)

Novel imprinted single CpG sites found by global DNA methylation analysis in human parthenogenetic induced pluripotent stem cells

  • Na Young Choi,
  • Jin Seok Bang,
  • Hye Jeong Lee,
  • Yo Seph Park,
  • Minseong Lee,
  • Dahee Jeong,
  • Kisung Ko,
  • Dong Wook Han,
  • Hyung-Min Chung,
  • Gwang Jun Kim,
  • Seung-Hyuk Shim,
  • Han Sung Hwang,
  • Kinarm Ko

DOI
https://doi.org/10.1080/15592294.2018.1460033
Journal volume & issue
Vol. 13, no. 4
pp. 343 – 351

Abstract

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Genomic imprinting is the process of epigenetic modification whereby genes are expressed in a parent-of-origin dependent manner; it plays an important role in normal growth and development. Parthenogenetic embryos contain only the maternal genome. Parthenogenetic embryonic stem cells could be useful for studying imprinted genes. In humans, mature cystic ovarian teratomas originate from parthenogenetic activation of oocytes; they are composed of highly differentiated mature tissues containing all three germ layers. To establish human parthenogenetic induced pluripotent stem cell lines (PgHiPSCs), we generated parthenogenetic fibroblasts from ovarian teratoma tissues. We compared global DNA methylation status of PgHiPSCs with that of biparental human induced pluripotent stem cells by using Illumina Infinium HumanMethylation450 BeadChip array. This analysis identified novel single imprinted CpG sites. We further tested DNA methylation patterns of two of these sites using bisulfite sequencing and described novel candidate imprinted CpG sites. These results confirm that PgHiPSCs are a powerful tool for identifying imprinted genes and investigating their roles in human development and diseases.

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