Wang Yunjia, Liu Zhenhao, Yang Guanteng, Gao Qile, Xiao Lige, Li Jiong, Guo Chaofeng, Troutwine Benjamin R, Gray Ryan S, Xie Lu, Zhang Hongqi
Department of Spine Surgery and Orthopaedics, Xiangya Hospital, Central South University, Changsha, China.
National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, China.
Front Cell Dev Biol. 2020 Nov 4;8:582255. doi: 10.3389/fcell.2020.582255. eCollection 2020.
Adolescent idiopathic scoliosis (AIS) is the most common pediatric spine disorder affecting ∼3% of children worldwide. Human genetic studies suggest a complex polygenic disease model for AIS with large genetic and phenotypic heterogeneity. However, the overall genetic etiology of AIS remains poorly understood. To identify additional AIS susceptibility loci, we performed whole-exome sequencing (WES) on a cohort of 195 Southern Chinese AIS patients. Bioinformatics analysis identified 237 novel rare variants associated with AIS, located in 232 new susceptibility loci. Enrichment analysis of these variants revealed 10 gene families associated with our AIS cohort. We screened these gene families by comparing our candidate gene list with IS candidate genes in the Human Phenotype Ontology (HPO) database and previous reported studies. Two candidate gene families, axonemal dynein and axonemal dynein assembly factors, were retained for their associations with ciliary architecture and function. The damaging effects of candidate variants in dynein genes , , , and , as well as in one fibrillin-related gene , were functionally analyzed in zebrafish using targeted CRISPR/Cas9 screening. Knockout of two candidate genes, or , recapitulated scoliosis in viable adult zebrafish. Altogether, our results suggest that the disruption of one or more dynein-associated factors may correlate with AIS susceptibility in the Southern Chinese population.
青少年特发性脊柱侧凸(AIS)是最常见的儿童脊柱疾病,全球约3%的儿童受其影响。人类遗传学研究表明,AIS是一种复杂的多基因疾病模型,具有较大的遗传和表型异质性。然而,AIS的整体遗传病因仍知之甚少。为了确定更多的AIS易感基因座,我们对195名中国南方AIS患者进行了全外显子组测序(WES)。生物信息学分析确定了237个与AIS相关的新的罕见变异,位于232个新的易感基因座中。对这些变异的富集分析揭示了与我们的AIS队列相关的10个基因家族。我们通过将候选基因列表与人类表型本体(HPO)数据库中的IS候选基因以及先前报道的研究进行比较,对这些基因家族进行了筛选。两个候选基因家族,轴丝动力蛋白和轴丝动力蛋白组装因子,因其与纤毛结构和功能的关联而被保留。使用靶向CRISPR/Cas9筛选技术,在斑马鱼中对动力蛋白基因、、、和以及一个原纤蛋白相关基因中的候选变异的破坏作用进行了功能分析。敲除两个候选基因或,在存活的成年斑马鱼中重现了脊柱侧凸。总之,我们的结果表明,一种或多种动力蛋白相关因子的破坏可能与中国南方人群的AIS易感性相关。