Mutation of NIMA-related kinase 1 (NEK1) leads to chromosome instability.

Mutation of NIMA-related kinase 1 (NEK1) leads to chromosome instability.
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DOI:
10.1186/1476-4598-10-5
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发表时间:
2011-01-10
期刊:
影响因子:
37.3
通讯作者:
Riley DJ
Riley DJ
中科院分区:
医学1区
文献类型:
--
作者:
Chen Y;Chen CF;Chiang HC;Pena M;Polci R;Wei RL;Edwards RA;Hansel DE;Chen PL;Riley DJ

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NEK1 是真菌蛋白激酶 Never-in-mitosis A (NIMA) 的第一个哺乳动物直系同源物,早期参与 DNA 损伤感知/修复途径。低剂量电离辐射 (IR) 后 DNA 双链断裂的持续存在表明 NEK1 缺陷细胞中 DNA 修复存在缺陷。 NEK1 缺陷细胞也无法激活检查点激酶 CHK1 和 CHK2,并且在 DNA 损伤后无法在 G1/S 或 G2/M 期检查点正确停滞。我们在此表明​​,NEK1 缺陷的细胞在有丝分裂染色体分离和胞质分裂中遭受重大错误,并成为非整倍体。这些 NEK1 缺陷细胞发生转化,获得在不依赖贴壁的条件下生长的能力,并在注射到同系小鼠体内时形成肿瘤。基因组不稳定性在 NEK1 +/- 小鼠中也很明显,这些小鼠在生命后期患淋巴瘤的几率比野生型同窝小鼠高得多。 NEK1 通过在多个关键点发挥作用来维持基因组稳定性,包括控制染色体稳定性。
NEK1, the first mammalian ortholog of the fungal protein kinase never-in-mitosis A (NIMA), is involved early in the DNA damage sensing/repair pathway. A defect in DNA repair in NEK1-deficient cells is suggested by persistence of DNA double strand breaks after low dose ionizing radiation (IR). NEK1-deficient cells also fail to activate the checkpoint kinases CHK1 and CHK2, and fail to arrest properly at G1/S or G2/M-phase checkpoints after DNA damage. We show here that NEK1-deficient cells suffer major errors in mitotic chromosome segregation and cytokinesis, and become aneuploid. These NEK1-deficient cells transform, acquire the ability to grow in anchorage-independent conditions, and form tumors when injected into syngeneic mice. Genomic instability is also manifest in NEK1 +/- mice, which late in life develop lymphomas with a much higher incidence than wild type littermates. NEK1 is required for the maintenance of genome stability by acting at multiple junctures, including control of chromosome stability.
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