Mechanism of microhomology-mediated end-joining promoted by human DNA polymerase θ.

Mechanism of microhomology-mediated end-joining promoted by human DNA polymerase θ.
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DOI:
10.1038/nsmb.2961
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发表时间:
2015-03
影响因子:
16.8
通讯作者:
Pomerantz, Richard T.
Pomerantz, Richard T.
中科院分区:
生物学1区
文献类型:
--
作者:
Kent, Tatiana;Chandramouly, Gurushankar;McDevitt, Shane Michael;Ozdemir, Ahmet Y.;Pomerantz, Richard T.

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微同源介导的末端连接(MMEJ)是一种容易出错的替代性双链断裂修复途径,它利用序列微同源性来重组断裂的DNA。尽管MMEJ与癌症发展有关,但该途径的机制尚不清楚。我们证明,纯化的人DNA聚合酶θ(Polθ)对含有3’单链DNA突出端且具有两个或更多个碱基对同源性的DNA进行MMEJ,包括以端粒为模型的DNA,并且表明在人类细胞中MMEJ依赖于Polθ。我们的数据支持一种机制,即Polθ促进末端连接和微同源退火,然后利用相对的突出端作为反式模板,从而稳定DNA突触。Polθ对含有5’-末端磷酸的DNA表现出偏好,这与参与非同源末端连接的聚合酶类似。最后,我们确定了一个对于MMEJ至关重要的保守环结构域以及Polθ的高级结构,它们可能促进DNA突触的形成。
Microhomology-mediated end-joining (MMEJ) is an error-prone alternative double-strand break repair pathway that utilizes sequence microhomology to recombine broken DNA. Although MMEJ is implicated in cancer development, the mechanism of this pathway is unknown. We demonstrate that purified human DNA polymerase θ (Polθ) performs MMEJ of DNA containing 3’ single-strand DNA overhangs with two or more base-pairs of homology, including DNA modeled after telomeres, and show that MMEJ is dependent on Polθ in human cells. Our data support a mechanism whereby Polθ facilitates end-joining and microhomology annealing then utilizes the opposing overhang as a template in trans which stabilizes the DNA synapse. Polθ exhibits a preference for DNA containing a 5’-terminal phosphate, similar to polymerases involved in non-homologous end-joining. Lastly, we identify a conserved loop domain that is essential for MMEJ and higher-order structures of Polθ which likely promote DNA synapse formation.
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