Rapid Rates of Pol II Elongation in the Drosophila Embryo.

Rapid Rates of Pol II Elongation in the Drosophila Embryo.
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DOI:
10.1016/j.cub.2017.03.069
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发表时间:
2017-05-08
期刊:
Current biology : CB
影响因子:
--
通讯作者:
Levine M
Levine M
中科院分区:
其他
文献类型:
--
作者:
Fukaya T;Lim B;Levine M

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RNA聚合酶II (Pol II)的伸长被认为是调控基因表达的重要机制。我们使用双荧光检测含有5 ' MS2和3 ' PP7 RNA茎环的新生转录本,测量了活体果蝇胚胎的第一波从头转录。Pol II的延伸率为2.4-3.0 kb/min,大约是先前估计的两倍[2-6]。修正后的比率允许在囊胚中期转变之前具有相当水平的合子基因活性。我们还提供证据表明,不同的伸长率并不是差异基因活性的重要来源,这表明转录起始和Pol II释放是发育过程中基因控制的关键决定因素。
Elongation of RNA polymerase II (Pol II) is thought to be an important mechanism for regulating gene expression [1]. We measured the first wave of de novo transcription in livingDrosophilaembryos using dual-fluorescence detection of nascent transcripts containing 5′ MS2 and 3′ PP7 RNA stem loops. Pol II elongation rates of 2.4–3.0 kb/min were observed, approximately twice as fast as earlier estimates [2–6]. The revised rates permit substantial levels of zygotic gene activity prior to the mid-blastula transition. We also provide evidence that variable rates of elongation are not a significant source of differential gene activity, suggesting that transcription initiation and Pol II release are the key determinants of gene control in development.
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