The spinocerebellar ataxia-associated gene Tau tubulin kinase 2 controls the initiation of ciliogenesis.

The spinocerebellar ataxia-associated gene Tau tubulin kinase 2 controls the initiation of ciliogenesis.
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DOI:
10.1016/j.cell.2012.10.010
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发表时间:
2012-11-09
期刊:
影响因子:
64.5
通讯作者:
Anderson KV
Anderson KV
中科院分区:
生物学1区
文献类型:
--
作者:
Goetz SC;Liem KF Jr;Anderson KV

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初级纤毛在人类发育和疾病中起着至关重要的作用,但调节纤毛发生的机制尚不清楚。在这里,我们表明Tau微管蛋白激酶2 (TTBK2)是体内纤毛发生起始的专用调节剂。基于Sonic hedgehog活性的缺失,我们发现了小鼠Ttbk2的一个空等位基因,Sonic hedgehog活性是一种需要初级纤毛的信号通路。尽管有正常的基底模板,但Ttbk2突变体缺乏纤毛。TTBK2作用于基底体的远端,在那里它促进CP110的去除,CP110盖住母体中心粒,并促进IFT蛋白的募集,IFT蛋白构建纤毛轴突。TTBK2显性截断突变导致脊髓小脑共济失调11型(SCA11)在野生型细胞中,这些突变蛋白不促进纤毛的发生,而抑制纤毛的发生。我们提出细胞周期调节因子将TTBK2靶向基底体,在基底体修饰特定靶标以启动纤毛发生。
The primary cilium has critical roles in human development and disease, but the mechanisms that regulate ciliogenesis are not understood. Here we show that Tau tubulin kinase 2 (TTBK2) is a dedicated regulator of the initiation of ciliogenesis in vivo. We identified a null allele of mouse Ttbk2 based on loss of Sonic hedgehog activity, a signaling pathway that requires the primary cilium. Despite a normal basal body template, Ttbk2 mutants lack cilia. TTBK2 acts at the distal end of the basal body, where it promotes the removal of CP110, which caps the mother centriole, and promotes recruitment of IFT proteins, which build the ciliary axoneme. Dominant truncating mutations in human TTBK2 cause Spinocerebellar Ataxia type 11 (SCA11); these mutant proteins do not promote ciliogenesis and inhibit ciliogenesis in wild-type cells. We propose that cell cycle regulators target TTBK2 to the basal body, where it modifies specific targets to initiate ciliogenesis.
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