FACT Sets a Barrier for Cell Fate Reprogramming in Caenorhabditis elegans and Human Cells.

FACT Sets a Barrier for Cell Fate Reprogramming in Caenorhabditis elegans and Human Cells.
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事实为秀丽隐杆线虫和人类细胞的细胞命运重编程设置了障碍。

DOI:
10.1016/j.devcel.2018.07.006
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发表时间:
2018-09-10
期刊:
影响因子:
11.8
通讯作者:
Tursun B
Tursun B
中科院分区:
生物学1区
文献类型:
--
作者:
Kolundzic E;Ofenbauer A;Bulut SI;Uyar B;Baytek G;Sommermeier A;Seelk S;He M;Hirsekorn A;Vucicevic D;Akalin A;Diecke S;Lacadie SA;Tursun B

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染色质调节因子(促进染色质转录)是通过促进转录来确保基因稳定表达的关键。在使用秀丽线虫的遗传筛查中,我们发现这一事实维持了细胞的特性,并对转录因子介导的细胞命运重新编程起到了屏障作用。值得注意的是,FACT作为细胞命运转换障碍的作用在人类中是保守的,因为我们表明FACT耗竭增强了成纤维细胞的重新编程。这种活动是意想不到的,因为FACT被认为是基因表达的积极调节因子,而之前描述的重新编程障碍通常会抑制基因表达。虽然在人成纤维细胞中,FACT耗竭会导致许多基因的表达下降,但一些被FACT占据的基因,包括重编程促进因子,在FACT耗竭时表达增加,这表明FACT具有抑制功能。我们的发现将FACT确定为线虫和人类的细胞重编程障碍,揭示了一种进化上保守的细胞命运保护机制。染色质调节因子FACT阻止线虫细胞重编程,人类FACT维持细胞命运,并拮抗线虫异位命运的诱导。人类细胞中的事实枯竭启动转录组,重新编程已知的细胞命运障碍重编程抑制基因表达,以防止异位命运。Kolundzic等人。现在表明,组蛋白伴侣事实,一种积极的基因表达调节因子,保护细胞身份,并在进化上为线虫和人类细胞中的细胞命运重新编程起到保守的屏障作用。
The chromatin regulator FACT (facilitates chromatin transcription) is essential for ensuring stable gene expression by promoting transcription. In a genetic screen using Caenorhabditis elegans, we identified that FACT maintains cell identities and acts as a barrier for transcription factor-mediated cell fate reprogramming. Strikingly, FACT’s role as a barrier to cell fate conversion is conserved in humans as we show that FACT depletion enhances reprogramming of fibroblasts. Such activity is unexpected because FACT is known as a positive regulator of gene expression, and previously described reprogramming barriers typically repress gene expression. While FACT depletion in human fibroblasts results in decreased expression of many genes, a number of FACT-occupied genes, including reprogramming-promoting factors, show increased expression upon FACT depletion, suggesting a repressive function of FACT. Our findings identify FACT as a cellular reprogramming barrier in C. elegans and humans, revealing an evolutionarily conserved mechanism for cell fate protection. Chromatin regulator FACT blocks cellular reprogramming in C. elegans and humans FACT maintains cell fates and antagonizes induction of ectopic fates in C. elegans FACT depletion in human cells primes the transcriptome for reprogramming Known barriers to cell fate reprogramming repress gene expression to prevent ectopic fates. Kolundzic et al. now show that the histone chaperone FACT, a positive regulator of gene expression, safeguards cell identities and acts as an evolutionarily conserved barrier for cell fate reprogramming in both C. elegans and human cells.
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