Tcstv1 and Tcstv3 elongate telomeres of mouse ES cells

Scientific Reports
Qian ZhangLin Liu

Abstract

Mouse embryonic stem cell (ESC) cultures exhibit a heterogeneous mixture of metastable cells sporadically entering the 2-cell (2C)-embryo-like state, critical for ESC potency. One of 2-cell genes, Zscan4, has been shown to be responsible for telomere maintenance, genomic stability and pluripotency of mouse ESCs. Functions of other 2C-genes in ESCs remain elusive. Here we show that 2C-genes Tcstv1 and Tcstv3 play a role in regulation of telomere lengths. Overexpression or knockdown Tcstv1 and Tcstv3 does not immediately affect proliferation, pluripotency and differentiation in vitro of ESCs. However, ectopic expression of Tcstv1 or Tcstv3 results in telomere elongation, whereas Tcstv1/3 knockdown shortens telomeres of ESCs. Overexpression of Tcstv1 or Tcstv3 does not alter telomere stability. Furthermore, Tcstv1 can increase Zscan4 protein levels and telomere recombination by telomere sister chromatid exchange (T-SCE). Depletion of Tcstv1/3 reduces Zscan4 protein levels. Together, Tcstv1 and Tcstv3 are involved in telomere maintenance that is required for long-term self-renewal of mouse ESCs. Our data also suggests that Tcstv1/3 may co-operate and stabilize Zscan4 protein but the molecular bases remain to be determined.

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Citations

Oct 19, 2017·Nucleic Acids Research·Foong Lyn ChanLee H Wong
Jan 18, 2020·FASEB Journal : Official Publication of the Federation of American Societies for Experimental Biology·Qian ZhangYu-Sheng Cong
Aug 28, 2020·Development·Alba Redó Riveiro, Joshua Mark Brickman

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Methods Mentioned

BETA
transfection
PCR
flow cytometry
fluorescence activated cell sorting
electrophoresis
immunoprecipitation

Software Mentioned

TFL
AxioCam
TELO
AxioVision

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