Loss of Function SPTAN1 Variants Result in Ataxia and Intellectual Disability.

IF 2.9 3区 医学 Q2 GENETICS & HEREDITY
Po-Nien Lu, Chandler Melton, Barbara Dupont, Julie R Jones, Fatima Abidi, Aubrey Rose, Wesley G Patterson, Michael J Lyons, Heather Flanagan-Steet
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引用次数: 0

Abstract

SPTAN1 mutations have been reported in association with autosomal dominant early infantile epileptic encephalopathy 5. Individuals present with early-onset seizures and profound intellectual disability. Recent reports suggest a wider spectrum with later-onset seizures and milder developmental delay. Here we describe two patients with loss-of-function variants in SPTAN1. One patient has ataxia and mild intellectual disability stemming from a de novo homozygous p.(Gln1448Pro) variant associated with uniparental disomy 9. The second patient, carrying a heterozygous p.(Asn1839del) allele, exhibits more substantial motor issues, developmental delay, and seizures. Ectopically expressed wild-type or variant-containing forms of sptan1 in zebrafish indicate both variants create loss-of-function alleles, with the p.(Gln1448Pro) likely being hypomorphic. This conclusion is supported by reduced protein abundance and localization of Sptan1 variants in axons of developing embryos. Further, unlike wild-type sptan1, analysis of the p.(Gln1448Pro) variant showed it failed to restore voltage-gated sodium channel localization in sptan1-null axons. Additional behavioral analyses show supplementation with the amino acid D-aspartate improved motility in sptan1-null zebrafish, supporting its use for α-II spectrin-associated motor dysfunction.

功能丧失SPTAN1变异导致共济失调和智力残疾。
据报道,SPTAN1突变与常染色体显性早期婴儿癫痫性脑病有关。个体表现为早发性癫痫和严重的智力残疾。最近的报告显示,癫痫发作较晚,发病范围更广,发育迟缓程度较轻。在这里,我们描述了两例具有SPTAN1功能丧失变异的患者。一名患者患有共济失调和轻度智力残疾,这是由一种与单亲二体相关的新纯合p.(Gln1448Pro)变异引起的。第二例患者携带杂合等位基因p.(Asn1839del),表现出更严重的运动问题、发育迟缓和癫痫发作。sptan1在斑马鱼中异位表达的野生型或含有变体的形式表明,这两种变体都产生了功能缺失的等位基因,其中p.(Gln1448Pro)可能是次型的。这一结论得到了发育中的胚胎轴突中Sptan1变异的蛋白丰度降低和定位的支持。此外,与野生型sptan1不同,对p.(Gln1448Pro)变体的分析表明,它无法恢复sptan1缺失轴突中电压门控钠通道的定位。另外的行为分析表明,补充d -天冬氨酸可以改善sptan1缺失的斑马鱼的运动能力,支持其用于α-II谱蛋白相关的运动功能障碍。
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来源期刊
Clinical Genetics
Clinical Genetics 医学-遗传学
CiteScore
6.50
自引率
0.00%
发文量
175
审稿时长
3-8 weeks
期刊介绍: Clinical Genetics links research to the clinic, translating advances in our understanding of the molecular basis of genetic disease for the practising clinical geneticist. The journal publishes high quality research papers, short reports, reviews and mini-reviews that connect medical genetics research with clinical practice. Topics of particular interest are: • Linking genetic variations to disease • Genome rearrangements and disease • Epigenetics and disease • The translation of genotype to phenotype • Genetics of complex disease • Management/intervention of genetic diseases • Novel therapies for genetic diseases • Developmental biology, as it relates to clinical genetics • Social science research on the psychological and behavioural aspects of living with or being at risk of genetic disease
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