The mitochondrial DNA polymerase gamma degrades linear DNA fragments precluding the formation of deletions.
The mitochondrial DNA polymerase gamma degrades linear DNA fragments precluding the formation of deletions.
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DOI:
10.1038/s41467-018-04895-1
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发表时间:
2018-06-27
影响因子:
16.6
通讯作者:
Moraes CT
中科院分区:
文献类型:
--
作者:
Nissanka N;Bacman SR;Plastini MJ;Moraes CT
Double-strand breaks in the mitochondrial DNA (mtDNA) result in the formation of linear fragments that are rapidly degraded. However, the identity of the nuclease(s) performing this function is not known. We found that the exonuclease function of the mtDNA polymerase gamma (POLG) is required for this rapid degradation of mtDNA fragments. POLG is recruited to linearized DNA fragments in an origin of replication-independent manner. Moreover, in the absence of POLG exonuclease activity, the prolonged existence of mtDNA linear fragments leads to increased levels of mtDNA deletions, which have been previously identified in the mutator mouse, patients with POLG mutations and normal aging. Mitochondrial DNA fragments are rapidly degraded when double strand breaks occur. Here the authors reveal that the exonuclease activity of polymerase gamma is important for efficient degradation of these fragments and to avoid formation of large deletions.
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影响因子:
64.8
作者:
Oka, Takafumi;Hikoso, Shungo;Yamaguchi, Osamu;Taneike, Manabu;Takeda, Toshihiro;Tamai, Takahito;Oyabu, Jota;Murakawa, Tomokazu;Nakayama, Hiroyuki;Nishida, Kazuhiko;Akira, Shizuo;Yamamoto, Akitsugu;Komuro, Issei;Otsu, Kinya
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通讯作者:
Moraes CT
DOI:
10.1016/j.bbagrm.2011.12.005
发表时间:
2012-09
影响因子:
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作者:
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通讯作者:
Copeland, William C.
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通讯作者:
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影响因子:
16.6
作者:
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通讯作者:
Milenkovic D