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2015 ; 5
(ä): 13691
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Tet-mediated imprinting erasure in H19 locus following reprogramming of
spermatogonial stem cells to induced pluripotent stem cells
#MMPMID26328763
Bermejo-Álvarez P
; Ramos-Ibeas P
; Park KE
; Powell AP
; Vansandt L
; Derek B
; Ramirez MA
; Gutiérrez-Adán A
; Telugu BP
Sci Rep
2015[Sep]; 5
(ä): 13691
PMID26328763
show ga
Selective methylation of CpG islands at imprinting control regions (ICR)
determines the monoparental expression of a subset of genes. Currently, it is
unclear whether artificial reprogramming induced by the expression of Yamanaka
factors disrupts these marks and whether cell type of origin affects the dynamics
of reprogramming. In this study, spermatogonial stem cells (SSC) that harbor
paternalized imprinting marks, and fibroblasts were reprogrammed to iPSC (SSCiPSC
and fiPSC). The SSCiPSC were able to form teratomas and generated chimeras with a
higher skin chimerism than those derived from fiPSC. RNA-seq revealed extensive
reprogramming at the transcriptional level with 8124 genes differentially
expressed between SSC and SSCiPSC and only 490 between SSCiPSC and fiPSC.
Likewise, reprogramming of SSC affected 26 of 41 imprinting gene clusters known
in the mouse genome. A closer look at H19 ICR revealed complete erasure in
SSCiPSC in contrast to fiPSC. Imprinting erasure in SSCiPSC was maintained even
after in vivo differentiation into teratomas. Reprogramming of SSC from Tet1 and
Tet2 double knockout mice however lacked demethylation of H19 ICR. These results
suggest that imprinting erasure during reprogramming depends on the epigenetic
landscape of the precursor cell and is mediated by TETs at the H19 locus.