Hipk2 cooperates with p53 to suppress γ-ray radiation-induced mouse thymic lymphoma.

Hipk2 cooperates with p53 to suppress γ-ray radiation-induced mouse thymic lymphoma.
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DOI:
10.1038/onc.2011.306
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发表时间:
2012-03-01
期刊:
影响因子:
8
通讯作者:
Balmain, A.
Balmain, A.
中科院分区:
医学1区
文献类型:
--
作者:
Mao, J-H;Wu, D.;Kim, I-J;Kang, H. C.;Wei, G.;Climent, J.;Kumar, A.;Pelorosso, F. G.;DelRosario, R.;Huang, E. J.;Balmain, A.

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对P53+/−和P53−/−小鼠产生的辐射诱导的胸腺淋巴瘤的全基因组遗传改变筛查显示,6号染色体上经常出现杂合性缺失(LOH)。对这些LOH区域的精细定位显示了三个不重叠的区域,其中一个区域被细化到0.2Mb区间,其中一个区域仅包含编码同源盒相互作用蛋白激酶2(Hipk2)的基因。在P53+/−和P53−/−小鼠辐射诱导的肿瘤中,超过30%的肿瘤显示出一个Hipk2等位基因的杂合性丢失。在种系中携带单一Hipk2失活等位基因的小鼠对γ辐射诱发肿瘤易感,但大多数肿瘤保留并表达野生型等位基因,提示Hipk2是一种单倍体不足的肿瘤抑制基因,对小鼠淋巴瘤的发生发展具有抑制作用。Hipk2和P53杂合性缺失对辐射诱导的淋巴瘤具有很强的增敏作用。我们得出结论:Hipk2是一个单倍体不足的淋巴瘤抑制基因。
A genome-wide screen for genetic alterations in radiation-induced thymic lymphomas generated from p53+/− and p53−/− mice showed frequent loss of heterozygosity (LOH) on chromosome 6. Fine mapping of these LOH regions revealed three non-overlapping regions, one of which was refined to a 0.2 Mb interval that contained only the gene encoding homeobox-interacting protein kinase 2 (Hipk2). More than 30% of radiation-induced tumors from both p53+/− and p53−/− mice showed heterozygous loss of one Hipk2 allele. Mice carrying a single inactive allele of Hipk2 in the germline were susceptible to induction of tumors by γ-radiation, but most tumors retained and expressed the wild-type allele, suggesting that Hipk2 is a haploinsufficient tumor suppressor gene for mouse lymphoma development. Heterozygous loss of both Hipk2 and p53 confers strong sensitization to radiation-induced lymphoma. We conclude that Hipk2 is a haploinsufficient lymphoma suppressor gene.
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