APOBEC3B can impair genomic stability by inducing base substitutions in genomic DNA in human cells.

APOBEC3B can impair genomic stability by inducing base substitutions in genomic DNA in human cells.
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DOI:
10.1038/srep00806
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发表时间:
2012
期刊:
影响因子:
4.6
通讯作者:
Takaori-Kondo, Akifumi
Takaori-Kondo, Akifumi
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Shinohara, Masanobu;Io, Katsuhiro;Shindo, Keisuke;Matsui, Masashi;Sakamoto, Takashi;Tada, Kohei;Kobayashi, Masayuki;Kadowaki, Norimitsu;Takaori-Kondo, Akifumi

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人APOBEC 3蛋白通过催化胞苷残基的脱氨作用,导致病毒DNA中的碱基取代,在细胞内防御病毒感染中发挥关键作用。活化诱导的胞苷脱氨酶(AID)是APOBEC家族的另一个成员,能够编辑免疫球蛋白(IG)和非IG基因,并且AID的异常表达导致肿瘤发生。然而,APOBEC3(A3)蛋白是否影响人类基因组的稳定性仍不清楚。在这里,我们证明了A3A和A3B都可以诱导人类基因组中的碱基替换,因为AID可以。A3B在几种淋巴瘤细胞中高度表达,并且在高度表达A3B的细胞的一些癌基因中发生体细胞突变。此外,A3B基因转染到淋巴瘤细胞中诱导cMYC基因的碱基替换。这些数据表明,A3B的异常表达可以引起基因组的不稳定性,通过诱导碱基替换到人类基因组中,这可能导致人类细胞中的肿瘤发生。
Human APOBEC3 proteins play pivotal roles in intracellular defense against viral infection by catalyzing deamination of cytidine residues, leading to base substitutions in viral DNA. Activation-induced cytidine deaminase (AID), another member of the APOBEC family, is capable of editing immunoglobulin (Ig) and non-Ig genes, and aberrant expression of AID leads to tumorigenesis. However, it remains unclear whether APOBEC3 (A3) proteins affect stability of human genome. Here we demonstrate that both A3A and A3B can induce base substitutions into human genome as AID can. A3B is highly expressed in several lymphoma cells and somatic mutations occur in some oncogenes of the cells highly expressing A3B. Furthermore, transfection of A3B gene into lymphoma cells induces base substitutions in cMYC gene. These data suggest that aberrant expression of A3B can evoke genomic instability by inducing base substitutions into human genome, which might lead to tumorigenesis in human cells.
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