Novel compound heterozygous variants in the USH2A gene associated with autosomal recessive retinitis pigmentosa without hearing loss

Frontiers in Cell and Developmental Biology

Cell and Developmental Biology

Guiyun He¹  Yanna Cao²  Yanxia Huang³  Lamei Yuan³  Xiong Deng³  Hao Deng⁴ 

[1] Department of Ophthalmology, Hunan Provincial People’s Hospital, The First Affiliated Hospital of Hunan Normal University, Changsha, China;Department of Ophthalmology, The Third Xiangya Hospital, Central South University, Changsha, China;Health Management Center, The Third Xiangya Hospital, Central South University, Changsha, China;Center for Experimental Medicine, The Third Xiangya Hospital, Central South University, Changsha, China;Disease Genome Research Center, Central South University, Changsha, China;Health Management Center, The Third Xiangya Hospital, Central South University, Changsha, China;Center for Experimental Medicine, The Third Xiangya Hospital, Central South University, Changsha, China;Disease Genome Research Center, Central South University, Changsha, China;Department of Neurology, The Third Xiangya Hospital, Central South University, Changsha, China;

关键词: compound heterozygous variants;    retinitis pigmentosa;    usherin gene;    whole exome sequencing;    photoreceptor cell death;   

DOI  :  10.3389/fcell.2023.1129862

 received in 2022-12-22, accepted in 2023-01-25,  发布年份 2023

来源: Frontiers

【 摘 要 】

Background: Retinitis pigmentosa (RP) is a group of progressive inherited retinal dystrophies characterized by the primary degeneration of rod photoreceptors and the subsequent loss of cone photoreceptors because of cell death. It is caused by different mechanisms, including inflammation, apoptosis, necroptosis, pyroptosis, and autophagy. Variants in the usherin gene (USH2A) have been reported in autosomal recessive RP with or without hearing loss. In the present study, we aimed to identify causative variants in a Han-Chinese pedigree with autosomal recessive RP.Methods: A six-member, three-generation Han-Chinese family with autosomal recessive RP was recruited. A full clinical examination, whole exome sequencing, and Sanger sequencing, as well as co-segregation analysis were performed.Results: Three heterozygous variants in the USH2A gene, c.3304C>T (p.Q1102*), c.4745T>C (p.L1582P), and c.14740G>A (p.E4914K), were identified in the proband, which were inherited from parents and transmitted to the daughters. Bioinformatics analysis supported the pathogenicity of the c.3304C>T (p.Q1102*) and c.4745T>C (p.L1582P) variants.Conclusions: Novel compound heterozygous variants in the USH2A gene, c.3304C>T (p.Q1102*) and c.4745T>C (p.L1582P), were identified as the genetic causes of autosomal recessive RP. The findings may enhance the current knowledge of the pathogenesis of USH2A-associated phenotypes, expand the spectrum of the USH2A gene variants, and contribute to improved genetic counseling, prenatal diagnosis, and disease management.

【 授权许可】

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Copyright © 2023 Huang, Yuan, He, Cao, Deng and Deng.