DCAF7/WDR68 is required for normal levels of DYRK1A and DYRK1B.

DCAF7/WDR68 is required for normal levels of DYRK1A and DYRK1B.
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DOI:
10.1371/journal.pone.0207779
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发表时间:
2018
期刊:
影响因子:
3.7
通讯作者:
Nissen RM
Nissen RM
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Yousefelahiyeh M;Xu J;Alvarado E;Yu Y;Salven D;Nissen RM

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双特异性酪氨酸磷酸化调节激酶 1A (DYRK1A) 基因的过度表达会导致与唐氏综合症 (DS) 相关的发育迟缓、颅面异常、认知障碍以及学习和记忆缺陷。 DCAF7/HAN11/WDR68(以下简称 WDR68)结合 DYRK1A,是颅面发育所必需的。越来越多的证据表明,DYRK1A-WDR68 复合物能够使多个器官系统正常生长和形成模式,并通过调节多个细胞环境中增殖和分化之间的平衡来抑制不适当的细胞生长/转化。在这里,我们使用工程小鼠 C2C12 和人类 HeLa 细胞系报告,WDR68 是 DYRK1A 正常水平所必需的。然而,Wdr68 不会显着调节 Dyrk1a mRNA 表达水平,并且蛋白酶体抑制不会恢复缺乏 Wdr68 的细胞(Δwdr68 细胞)中的 DYRK1A。 WDR68 的过表达增加了 DYRK1A 水平,而 DYRK1A 的过表达对 WDR68 水平没有影响。我们进一步报道,WDR68 对于密切相关的 DYRK1B 激酶的正常水平同样是必需的,并且 DYRK1A 和 DYRK1B 对于 C2C12 细胞从增殖到分化的转变至关重要。这些发现揭示了 WDR68 在 DYRK1A-WDR68 和 DYRK1B-WDR68 复合物中的额外作用。
Overexpression of the Dual-specificity Tyrosine Phosphorylation-Regulated Kinase 1A (DYRK1A) gene contributes to the retardation, craniofacial anomalies, cognitive impairment, and learning and memory deficits associated with Down Syndrome (DS). DCAF7/HAN11/WDR68 (hereafter WDR68) binds DYRK1A and is required for craniofacial development. Accumulating evidence suggests DYRK1A-WDR68 complexes enable proper growth and patterning of multiple organ systems and suppress inappropriate cell growth/transformation by regulating the balance between proliferation and differentiation in multiple cellular contexts. Here we report, using engineered mouse C2C12 and human HeLa cell lines, that WDR68 is required for normal levels of DYRK1A. However, Wdr68 does not significantly regulate Dyrk1a mRNA expression levels and proteasome inhibition did not restore DYRK1A in cells lacking Wdr68 (Δwdr68 cells). Overexpression of WDR68 increased DYRK1A levels while overexpression of DYRK1A had no effect on WDR68 levels. We further report that WDR68 is similarly required for normal levels of the closely related DYRK1B kinase and that both DYRK1A and DYRK1B are essential for the transition from proliferation to differentiation in C2C12 cells. These findings reveal an additional role of WDR68 in DYRK1A-WDR68 and DYRK1B-WDR68 complexes.
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