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2015 ; 10
(12
): e0144897
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Genome-Wide Dynamic Profiling of Histone Methylation during Nuclear
Transfer-Mediated Porcine Somatic Cell Reprogramming
#MMPMID26683029
Cao Z
; Li Y
; Chen Z
; Wang H
; Zhang M
; Zhou N
; Wu R
; Ling Y
; Fang F
; Li N
; Zhang Y
PLoS One
2015[]; 10
(12
): e0144897
PMID26683029
show ga
The low full-term developmental efficiency of porcine somatic cell nuclear
transfer (SCNT) embryos is mainly attributed to imperfect epigenetic
reprogramming in the early embryos. However, dynamic expression patterns of
histone methylation involved in epigenetic reprogramming progression during
porcine SCNT embryo early development remain to be unknown. In this study, we
characterized and compared the expression patterns of multiple histone
methylation markers including transcriptionally repressive (H3K9me2, H3K9me3,
H3K27me2, H3K27me3, H4K20me2 and H4K20me3) and active modifications (H3K4me2,
H3K4me3, H3K36me2, H3K36me3, H3K79me2 and H3K79me3) in SCNT early embryos from
different developmental stages with that from in vitro fertilization (IVF)
counterparts. We found that the expression level of H3K9me2, H3K9me3 and H4K20me3
of SCNT embryos from 1-cell to 4-cell stages was significantly higher than that
in the IVF embryos. We also detected a symmetric distribution pattern of H3K9me2
between inner cell mass (ICM) and trophectoderm (TE) in SCNT blastocysts. The
expression level of H3K9me2 in both lineages from SCNT expanded blastocyst
onwards was significantly higher than that in IVF counterparts. The expression
level of H4K20me2 was significantly lower in SCNT embryos from morula to
blastocyst stage compared with IVF embryos. However, no aberrant dynamic
reprogramming of H3K27me2/3 occurred during early developmental stages of SCNT
embryos. The expression of H3K4me3 was higher in SCNT embryos at 4-cell stage
than that of IVF embryos. H3K4me2 expression in SCNT embryos from 8-cell stage to
blastocyst stage was lower than that in the IVF embryos. Dynamic patterns of
other active histone methylation markers were similar between SCNT and IVF
embryos. Taken together, histone methylation exhibited developmentally
stage-specific abnormal expression patterns in porcine SCNT early embryos.