CtBP-interacting BTB Zinc Finger Protein (CIBZ) Promotes Proliferation and G1/S Transition in Embryonic Stem Cells Via Nanog

Overview

Journal J Biol Chem

Specialty Biochemistry

Date 2012 Feb 9

PMID 22315219

Citations 18

Authors

Tomonori Nishii

Yu Oikawa

Yasumasa Ishida

Masashi Kawaichi

Eishou Matsuda

Affiliations

Soon will be listed here.

Abstract

Mouse embryonic stem cells (ESCs) require transcriptional regulation to ensure rapid proliferation that allows for self-renewal. However, the molecular mechanism by which transcriptional factors regulate this rapid proliferation remains largely unknown. Here we present data showing that CIBZ, a BTB domain zinc finger transcriptional factor, is a key transcriptional regulator for regulation of ESC proliferation. Here we show that deletion or siRNA knockdown of CIBZ inhibits ESC proliferation. Cell cycle analysis shows that loss of CIBZ delays the progression of ESCs through the G1 to S phase transition. Conversely, constitutive ectopic expression of exogenous CIBZ in ESCs promotes proliferation and accelerates G1/S transition. These findings suggest that regulation of the G1/S transition explains, in part, CIBZ-associated ESC proliferation. Our data suggest that CIBZ acts through the post-transcriptionally regulates the expression of Nanog, a positive regulator of ESC proliferation and G1/S transition, but does not affect Oct3/4 and Sox2 protein expression. Notably, constitutive overexpression of Nanog partially rescued the proliferation defect caused by CIBZ knockdown, indicating the role of CIBZ in ESC proliferation and G1/S transition at least in part depends on the Nanog protein level.

Citing Articles

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Heterozygous loss of Zbtb38 leads to early embryonic lethality via the suppression of Nanog and Sox2 expression.

Nishio M, Matsuura T, Hibi S, Ohta S, Oka C, Sasai N Cell Prolif. 2022; 55(4):e13215.

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