Misregulation of cell cycle-dependent methylation of budding yeast CENP-A contributes to chromosomal instability.

Misregulation of cell cycle-dependent methylation of budding yeast CENP-A contributes to chromosomal instability.
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DOI:
10.1091/mbc.e23-03-0108
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发表时间:
2023-09-01
影响因子:
3.3
通讯作者:
Basrai, Munira A.
Basrai, Munira A.
中科院分区:
生物学3区
文献类型:
--
作者:
Mishra, Prashant K.;Au, Wei-Chun;Castineira, Pedro G.;Ali, Nazrin;Stanton, John;Boeckmann, Lars;Takahashi, Yoshimitsu;Costanzo, Michael;Boone, Charles;Bloom, Kerry S.;Thorpe, Peter H.;Basrai, Munira A.

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着丝粒(CEN)的身份是由特殊的核小体在表观遗传上指定的,核小体含有进化上保守的CEN特异性组蛋白H3变体CENP-A (Saccharomyces cerevisiae中的Cse4,人类中的CENP-A),这对于忠实的染色体分离至关重要。然而,调控Cse4功能的表观遗传机制尚未完全明确。在这项研究中,我们发现细胞周期依赖性的Cse4-R37甲基化调节着着丝点功能和高保真染色体分离。我们生成了一种特异性识别甲基化Cse4- r37的定制抗体,并表明Cse4的甲基化受细胞周期的调节,甲基化Cse4- r37的最高水平,其在CEN染色质上的富集发生在有丝分裂细胞中。甲基模拟cse4-R37F突变体表现出与着丝点突变体、cn相关着丝点蛋白水平降低和染色体不稳定性(CIN)的合成致死率,这表明在整个细胞周期中模拟Cse4-R37的甲基化对忠实的染色体分离是有害的。我们的研究结果表明SPOUT甲基转移酶Upa1有助于Cse4-R37的甲基化,Upa1的过表达导致CIN表型。总之,我们的研究已经确定了细胞周期调节的Cse4甲基化在高保真染色体分离中的作用,并强调了表观遗传修饰(如着丝点蛋白甲基化)在预防CIN(人类癌症的一个重要标志)中的重要作用。
Centromere (CEN) identity is specified epigenetically by specialized nucleosomes containing evolutionarily conserved CEN-specific histone H3 variant CENP-A (Cse4 in Saccharomyces cerevisiae, CENP-A in humans), which is essential for faithful chromosome segregation. However, the epigenetic mechanisms that regulate Cse4 function have not been fully defined. In this study, we show that cell cycle-dependent methylation of Cse4-R37 regulates kinetochore function and high-fidelity chromosome segregation. We generated a custom antibody that specifically recognizes methylated Cse4-R37 and showed that methylation of Cse4 is cell cycle regulated with maximum levels of methylated Cse4-R37 and its enrichment at the CEN chromatin occur in the mitotic cells. Methyl-mimic cse4-R37F mutant exhibits synthetic lethality with kinetochore mutants, reduced levels of CEN-associated kinetochore proteins and chromosome instability (CIN), suggesting that mimicking the methylation of Cse4-R37 throughout the cell cycle is detrimental to faithful chromosome segregation. Our results showed that SPOUT methyltransferase Upa1 contributes to methylation of Cse4-R37 and overexpression of UPA1 leads to CIN phenotype. In summary, our studies have defined a role for cell cycle-regulated methylation of Cse4 in high-fidelity chromosome segregation and highlight an important role of epigenetic modifications such as methylation of kinetochore proteins in preventing CIN, an important hallmark of human cancers.
DOI: 10.1093/nar/gkr279
发表时间: 2011-08
影响因子: 14.9
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期刊: The Journal of cell biology
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发表时间: 2023-04-06
期刊: GENETICS
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DOI: 10.1016/j.abb.2010.05.023
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影响因子: 3.9
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