Micronucleus-specific histone H1 is required for micronuclear chromosome integrity in Tetrahymena thermophila.

Micronucleus-specific histone H1 is required for micronuclear chromosome integrity in Tetrahymena thermophila.
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嗜热四膜虫的微核染色体完整性需要微核特异性组蛋白 H1

DOI:
10.1371/journal.pone.0187475
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发表时间:
2017
期刊:
影响因子:
3.7
通讯作者:
Wang W
Wang W
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Qiao J;Xu J;Bo T;Wang W

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组蛋白H1分子在建立和维持高阶染色质结构中起着关键作用。它们可以与进入和离开核小体的连接物DNA结合,并调节转录活动。嗜热四膜虫有两个组蛋白H1,即大核组蛋白H1和微核组蛋白H1(MLH1)。在生长和饥饿阶段,MLH1特异性地定位于微核。此外,MLH1定位于微核周围,并在结合阶段形成特定的结构。在微核减数分裂过程中,它与纺锤体部分共定位。对MLH1基因敲除的分析表明,在接合阶段,MLH1对于微核的完整性和发育是必需的。MLH1的过表达导致细胞接合进程异常。逆转录聚合酶链式反应分析表明,在接合过程中,HMGB3在ΔMLH1中的表达水平增加,而在ΔHMGB3细胞中的表达水平在接合过程中增加。这些结果表明,嗜热链霉菌的微核完整性和性发育需要MLH1的正常表达,HmgB3和MLH1在调节微核结构方面可能是相互补偿的。
Histone H1 molecules play a key role in establishing and maintaining higher order chromatin structures. They can bind to linker DNA entering and exiting the nucleosome and regulate transcriptional activity. Tetrahymena thermophila has two histone H1, namely, macronuclear histone H1 and micronuclear histone H1 (Mlh1). Mlh1 is specifically localized at micronuclei during growth and starvation stages. Moreover, Mlh1 is localized around micronuclei and forms a specific structure during the conjugation stage. It co-localizes partially with spindle apparatus during micronuclear meiosis. Analysis of MLH1 knock-out revealed that Mlh1 was required for the micronuclear integrity and development during conjugation stage. Overexpression of Mlh1 led to abnormal conjugation progression. RT-PCR analysis indicated that the expression level of HMGB3 increased in ΔMLH1 strains, while the expression level of MLH1 increased in ΔHMGB3 cells during conjugation. These results indicate that micronuclear integrity and sexual development require normal expression level of Mlh1 and that HmgB3 and Mlh1 may functionally compensate each other in regulating micronuclear structure in T. thermophila.
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