C. elegans LIN-28 controls temporal cell fate progression by regulating LIN-46 expression via the 5' UTR of lin-46 mRNA.

C. elegans LIN-28 controls temporal cell fate progression by regulating LIN-46 expression via the 5' UTR of lin-46 mRNA.
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DOI:
10.1016/j.celrep.2021.109670
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发表时间:
2021-09-07
期刊:
影响因子:
8.8
通讯作者:
Ambros V
Ambros V
中科院分区:
生物学1区
文献类型:
--
作者:
Ilbay O;Nelson C;Ambros V

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Lin28/LIN-28 是一种保守的 RNA 结合蛋白,可促进增殖和多能性,并可在哺乳动物中致癌。哺乳动物 Lin28 和线虫 LIN-28 已被证明可通过直接结合未加工的 let-7 转录本来抑制保守细胞分化促进 microRNA let-7 的生物发生。 Lin28/LIN-28 还结合并调节不同细胞类型中的许多 mRNA。然而,LIN-28-mRNA 相互作用的决定因素和后果尚不清楚。在这里,我们报告线虫 LIN-28 抑制异时途径下游蛋白 LIN-46 的表达。我们发现 lin-28 和 lin-46 5' UTR 内的序列对于防止早期幼虫阶段的 LIN-46 表达是必需的。此外,我们发现由 lin-46 5' UTR 突变引起的早熟 LIN-46 表达足以引起与 lin-28(lf) 动物相似的早熟异时性缺陷。因此,我们的研究结果证明了 LIN-28 调节个体靶 mRNA 的生物学重要性。伊尔巴伊等人。描述了 lin-46 的 5' UTR 的作用,lin-46 是线虫中的异时基因,也是广泛保守的 RNA 结合蛋白 LIN-28 的关键 mRNA 靶标,证明了 LIN-28 与保守的 microRNA let-7 在体内调节 mRNA 的重要性。
Lin28/LIN-28 is a conserved RNA-binding protein that promotes proliferation and pluripotency and can be oncogenic in mammals. Mammalian Lin28 and C. elegans LIN-28 have been shown to inhibit biogenesis of the conserved cellular differentiation-promoting microRNA let-7 by directly binding to unprocessed let-7 transcripts. Lin28/LIN-28 also bind and regulate many mRNAs in diverse cell types. However, the determinants and consequences of LIN-28-mRNA interactions are not well understood. Here, we report that C. elegans LIN-28 represses the expression of LIN-46, a downstream protein in the heterochronic pathway. We find that lin-28 and sequences within the lin-46 5′ UTR are required to prevent LIN-46 expression at early larval stages. Moreover, we find that precocious LIN-46 expression caused by mutations in the lin-46 5′ UTR is sufficient to cause precocious heterochronic defects similar to those of lin-28(lf) animals. Thus, our findings demonstrate the biological importance of the regulation of individual target mRNAs by LIN-28. Ilbay et al. characterize the role of the 5′ UTR of lin-46, a heterochronic gene in C. elegans and the critical mRNA target of the widely conserved RNA-binding protein LIN-28, demonstrating the importance of the regulation of mRNAs by LIN-28 in vivo along with the conserved microRNA let-7.
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