De novo CLCN3 variants affecting Gly327 cause severe neurodevelopmental syndrome with brain structural abnormalities

De novo CLCN3 variants affecting Gly327 cause severe neurodevelopmental syndrome with brain structural abnormalities
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影响 Gly327 的从头 CLCN3 变异导致严重的神经发育综合征并伴有大脑结构异常

DOI:
10.1038/s10038-022-01106-0
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发表时间:
2022
影响因子:
3.5
通讯作者:
Saitsu Hirotomo
Saitsu Hirotomo
中科院分区:
生物学3区
文献类型:
--
作者:
Nakashima Mitsuko;Argilli Emanuela;Nakano Sayaka;Sherr Elliott H.;Kato Mitsuhiro;Saitsu Hirotomo

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最近的一项研究表明,氯电压门控通道3(CLCN 3)中的单等位基因错义或双等位基因功能丧失变体导致神经发育障碍,从而导致脑异常。功能研究表明,一些错义变体对通道活性具有不同的功能获得效应。同时,两名纯合移码变异患者表现出严重的神经精神障碍和一系列脑结构异常。在这里,我们描述了两名患者的de novoCLCN 3变异影响相同的氨基酸,Gly327(p。(Gly327Ser)和p.(Gly327Asp))。他们表现出严重的神经系统表型,包括全面发育迟缓,智力残疾,张力减退,未能茁壮成长,和各种大脑异常。他们还表现出特征性的大脑和眼科异常,海马和视网膜退化,这在携带纯合功能丧失变体的患者中观察到。这些发现也在CLCN 3缺陷小鼠中观察到,表明单等位基因错义变体也可能具有显性负效应。这项研究将扩大CLCN 3相关疾病的表型谱。
A recent study revealed that monoallelic missense or biallelic loss-of-function variants in the chloride voltage-gated channel 3 (CLCN3) cause neurodevelopmental disorders resulting in brain abnormalities. Functional studies suggested that some missense variants had varying gain-of-function effects on channel activity. Meanwhile, two patients with homozygous frameshift variants showed severe neuropsychiatric disorders and a range of brain structural abnormalities. Here we describe two patients with de novoCLCN3variants affecting the same amino acid, Gly327 (p.(Gly327Ser) and p.(Gly327Asp)). They showed severe neurological phenotypes including global developmental delay, intellectual disability, hypotonia, failure to thrive, and various brain abnormalities. They also presented with characteristic brain and ophthalmological abnormalities, hippocampal and retinal degradation, which were observed in patients harboring homozygous loss-of-function variants. These findings were also observed inCLCN3-deficient mice, indicating that the monoallelic missense variant may also have a dominant negative effect. This study will expand the phenotypic spectrum ofCLCN3-related disorders.
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