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Polypyrimidine tract-binding protein is essential for early mouse development and embryonic stem cell proliferation

机译:聚嘧啶束结合蛋白对于小鼠早期发育和胚胎干细胞增殖至关重要

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摘要

Polypyrimidine tract-binding protein (PTB) is a widely expressed RNA-binding protein with multiple roles in RNA processing, including the splicing of alternative exons, mRNA stability, mRNA localization, and internal ribosome entry site-dependent translation. Although it has been reported that increased expression of PTB is correlated with cancer cell growth, the role of PTB in mammalian development is still unclear. Here, we report that a homozygous mutation in the mouse Ptb gene causes embryonic lethality shortly after implantation. We also established Ptb/ embryonic stem (ES) cell lines and found that these mutant cells exhibited severe defects in cell proliferation without aberrant differentiation in vitro or in vivo. Furthermore, cell cycle analysis and a cell synchronization assay revealed that Ptb/ ES cells have a prolonged G/M phase. Thus, our data indicate that PTB is essential for early mouse development and ES cell proliferation.
机译:聚嘧啶束结合蛋白(PTB)是一种广泛表达的RNA结合蛋白,在RNA处理中具有多种作用,包括替代外显子的剪接,mRNA稳定性,mRNA定位和内部核糖体进入位点依赖性翻译。尽管已经报道了PTB表达的增加与癌细胞的生长有关,但是PTB在哺乳动物发育中的作用仍不清楚。在这里,我们报道小鼠Ptb基因中的纯合突变会在植入后不久导致胚胎致死率。我们还建立了Ptb /胚胎干(ES)细胞系,并发现这些突变细胞在体外或体内没有明显分化的情况下在细胞增殖中显示出严重缺陷。此外,细胞周期分析和细胞同步测定表明,Ptb / ES细胞具有延长的G / M期。因此,我们的数据表明PTB对于早期小鼠发育和ES细胞增殖至关重要。

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