首页> 美国卫生研究院文献>European Journal of Human Genetics >Novel compound heterozygous variants in PLK4 identified in a patient with autosomal recessive microcephaly and chorioretinopathy
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Novel compound heterozygous variants in PLK4 identified in a patient with autosomal recessive microcephaly and chorioretinopathy

机译:在常染色体隐性小头畸形和脉络膜视网膜病变的患者中鉴定出PLK4中的新型复合杂合变体

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摘要

It has been well documented that variants in genes encoding centrosomal proteins cause primary autosomal recessive microcephaly, although the association between centrosomal defects and the etiology of microcephaly syndromes is not fully understood. Polo-like kinase 4 (PLK4) is one of the centrosomal proteins required for centriole duplication. We here describe a patient with microcephaly and chorioretinopathy that harbors compound heterozygous missense variants, c.[442A>G] [2336G>A], in the PLK4 gene. One of these variants, c.442A>G (p.(M148V)), resides in the kinase domain, and the other, c.2336G>A (p.(C779Y)), in the polo-box domain. Aberrant spindle formation was observed in a LCL derived from this patient. Overexpression experiments of the variant PLK4 proteins demonstrated that the p.(C779Y) but not the p.(M148V) had lost centriole overduplication ability. The altered mobility pattern of both variant proteins on a western blot further suggested alterations in post-translation modification. Our data lend support to the hypothesis that impaired centriole duplication caused by PLK4 variants may be involved in the etiology of microcephaly disorder.
机译:众所周知,编码中心体蛋白的基因变异会导致原发性常染色体隐性遗传性小头畸形,尽管中心体缺陷与小头畸形病因之间的关联尚不完全清楚。马球样激酶4(PLK4)是中心体复制所需的中心体蛋白之一。我们在这里描述了一个患有小头畸形和脉络膜视网膜病变的患者,该患者在PLK4基因中具有复合杂合错义变体c。[442A> G] [2336G> A]。这些变体中的一个c.442A> G(p。(M148V))位于激酶结构域中,另一个变体c.2336G> A(p。(C779Y))位于polo-box域中。在源自该患者的LCL中观察到异常的纺锤体形成。对PLK4变异蛋白的过表达实验表明,p。(C779Y)而不是p。(M148V)失去了中心体的重复复制能力。蛋白质印迹法上两种变体蛋白迁移率模式的改变进一步提示了翻译后修饰的改变。我们的数据支持以下假说:由PLK4变异引起的中心粒复制受损可能与小头畸形的病因有关。

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