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Mol. Cells 2008; 25(3): 358-367

Published online May 31, 2008

© The Korean Society for Molecular and Cellular Biology

Derivation of Embryonic Germ Cells from Post Migratory Primordial Germ Cells, and Methylation Analysis of Their Imprinted Genes by Bisulfite Genomic Sequencing

Sang Woo Shim, Dong Wook Han, Ji Hoon Yang, Bo Yeon Lee, Seung Bo Kim, Hosup Shim and Hoon Taek Lee

Abstract

The embryonic germ cell (EGCs) of mice is a kind of pluripotent stem cell that can be generated from pre- and post-migratory primordial germ cells (PGCs). Most previous studies on DNA methylation of EGCs were restricted to 12.5 days post coitum (dpc). This study was designed to establish and characterize murine EGC lines from migrated PGCs as late as 13.5 dpc and to estimate the degrees of methylation of their imprinted genes as well as of the non-imprinted locus, Oct4, using an accurate and quantitative method of measurement. We established five independent EGC lines from post migratory PGCs of 11.5?13.5 dpc from C57BL/6 × DBA/2 F1 hybrid mouse fetuses. All the EGCs exhibited the typical features of pluripotent cells including hypomethylation of the Oct4 regulatory region. We examined the methylation status of three imprinted genes; Igf2, Igf2r and H19 in the five EGC lines using bisulfite genomic sequencing analysis. Igf2r was almost unmethylated in all the EGC lines irrespective of the their sex and stage of isolation; Igf2 and H19 were more methylated than Igf2r, especially in male EGCs. Moreover, EGCs derived at 13.5 dpc exhibited higher levels of DNA methylation than those from earlier stages. These results suggest that in vitro derived EGCs acquire different epigenotypes from their parental in vivo migratory PGCs, and that sex-specific de novo methylation occurs in the Igf2 and H19 genes of EGCs.

Keywords Bisulfite Sequencing; Embryonic Germ Cell (EGCs), Imprint Genes, Methylation, Mouse, Pluripotency, Primordial Germ Cell (PGCs)

Article

Research Article

Mol. Cells 2008; 25(3): 358-367

Published online May 31, 2008

Copyright © The Korean Society for Molecular and Cellular Biology.

Derivation of Embryonic Germ Cells from Post Migratory Primordial Germ Cells, and Methylation Analysis of Their Imprinted Genes by Bisulfite Genomic Sequencing

Sang Woo Shim, Dong Wook Han, Ji Hoon Yang, Bo Yeon Lee, Seung Bo Kim, Hosup Shim and Hoon Taek Lee

Abstract

The embryonic germ cell (EGCs) of mice is a kind of pluripotent stem cell that can be generated from pre- and post-migratory primordial germ cells (PGCs). Most previous studies on DNA methylation of EGCs were restricted to 12.5 days post coitum (dpc). This study was designed to establish and characterize murine EGC lines from migrated PGCs as late as 13.5 dpc and to estimate the degrees of methylation of their imprinted genes as well as of the non-imprinted locus, Oct4, using an accurate and quantitative method of measurement. We established five independent EGC lines from post migratory PGCs of 11.5?13.5 dpc from C57BL/6 × DBA/2 F1 hybrid mouse fetuses. All the EGCs exhibited the typical features of pluripotent cells including hypomethylation of the Oct4 regulatory region. We examined the methylation status of three imprinted genes; Igf2, Igf2r and H19 in the five EGC lines using bisulfite genomic sequencing analysis. Igf2r was almost unmethylated in all the EGC lines irrespective of the their sex and stage of isolation; Igf2 and H19 were more methylated than Igf2r, especially in male EGCs. Moreover, EGCs derived at 13.5 dpc exhibited higher levels of DNA methylation than those from earlier stages. These results suggest that in vitro derived EGCs acquire different epigenotypes from their parental in vivo migratory PGCs, and that sex-specific de novo methylation occurs in the Igf2 and H19 genes of EGCs.

Keywords: Bisulfite Sequencing, Embryonic Germ Cell (EGCs), Imprint Genes, Methylation, Mouse, Pluripotency, Primordial Germ Cell (PGCs)

Mol. Cells
Nov 30, 2022 Vol.45 No.11, pp. 763~867
COVER PICTURE
Naive (cyan) and axotomized (magenta) retinal ganglion cell axons in Xenopus tropicalis (Choi et al., pp. 846-854).

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