Nuclear poly(A) tail size is regulated by Cnot1 during the serum response

Nuclear poly(A) tail size is regulated by Cnot1 during the serum response
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血清反应期间核聚腺苷酸尾部大小受 Cnot1 调节

DOI:
10.1101/773432
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发表时间:
2019
期刊:
--
影响因子:
--
通讯作者:
Singhania R
Singhania R
中科院分区:
--
文献类型:
--
作者:
Singhania R

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从 mRNA 中去除 Poly(A) 尾会导致 mRNA 合成和衰变之间出现延迟。我们测量了血清诱导的 mRNA 的水平和 Poly(A) 尾部大小,并使用数学模型来比较它们的脱腺苷化时间和衰减延迟,发现它们确实相关。我们的数据与诱导峰值后稍后时间点的聚腺苷酸化模型之间的差异促使我们研究新制备的 mRNA 上聚腺苷酸尾的大小。令人惊讶的是,在诱导后期合成的新的血清诱导 mRNA 在细胞核中具有短的聚腺苷酸尾(A25 附近)。此外,新制备的组成型 mRNA 具有中等大小的聚腺苷酸尾(A50 左右)。为了了解去腺苷化是否是造成新的短聚腺苷酸尾的原因,我们耗尽了 Cnot1(CCR4/NOT 去腺苷酶的一个亚基)。正如预期的那样,Cnot1 耗尽会导致细胞质 mRNA 去腺苷化减慢,但也会减少转录并导致核 mRNA 聚 (A) 尾更长。这些观察结果表明 CCR4/NOT 调节血清诱导 mRNA 的转录和核聚腺苷酸尾部大小。检测到一些带有长 Poly(A) 尾的染色质相关 mRNA 表明核去腺苷化是一个早期事件。我们的数据表明,mRNA 的初始 Poly(A) 尾部大小可以调节,并不总是 200-250 个核苷酸,为基因表达的控制添加了一个新的层。
The poly(A) tail removal from mRNAs introduces a delay between mRNA synthesis and decay. We measured levels and poly(A) tail sizes of serum-induced mRNAs and used mathematical modelling to compare their deadenylation time with the delay in decay and found that they are indeed correlated. Discrepancies between our data and the polyadenylation models at later time points after the peak of induction led us to investigate the size of the poly(A) tails on newly made mRNA. Surprisingly, new serum-induced mRNAs synthesised late in induction had short poly(A) tails (around A25) in the nucleus. In addition, newly made constitutive mRNAs had medium sized poly(A) tails (around A50). To see if deadenylation was responsible for the new short poly(A) tails, we depleted Cnot1, a subunit of the CCR4/NOT deadenylase. Cnot1 depletion led to slower deadenylation of cytoplasmic mRNAs, as expected, but also decreased transcription and led to longer nuclear mRNA poly(A) tails. These observations implicate CCR4/NOT in regulating both the transcription and the nuclear poly(A) tail size of serum-induced mRNAs. Detection of some chromatin-associated mRNAs with long poly(A) tails suggested that nuclear deadenylation is an early event. Our data show that initial poly(A) tail size of mRNAs can be regulated and is not always 200-250 nucleotides, adding a novel layer to the control of gene expression.
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