Characterization of two novel knock-in mouse models of syndromic retinal ciliopathy carrying hypomorphic Sdccag8 mutations  

作　　者：Zhi-Lin Ren Hou-Bin Zhang Lin Li Zheng-Lin Yang Li Jiang 

机构地区：[1]Department of Laboratory Medicine,Sichuan Provincial People's Hospital,School of Medicine,University of Electronic Science and Technology of China,Chengdu,Sichuan 610072,China [2]Sichuan Provincial Key Laboratory for Human Disease Gene Study,Sichuan Provincial People's Hospital,University of Electronic Science and Technology of China,Chengdu,Sichuan 610072,China [3]Research Unit for Blindness Prevention of Chinese Academy of Medical Sciences(2019RU026),Sichuan Academy of Medical Sciences,Chengdu,Sichuan 610072,China

出　　处：《Zoological Research》2022年第3期442-456,共15页动物学研究（英文）

基　　金：supported by the Natural Science Foundation of China(81670893,82121003);Science and Technology Department of Sichuan Province(2021JDZH0031);Chinese Academy of Medical Sciences(2019-I2M-5-032)。

摘　　要：Mutations in serologically defined colon cancer autoantigen protein 8(SDCCAG8)were first identified in retinal ciliopathy families a decade ago with unknown function.To investigate the pathogenesis of SDCCAG8-associated retinal ciliopathies in vivo,we employed CRISPR/Cas9-mediated homology-directed recombination(HDR)to generate two knock-in mouse models,Sdccag8^(Y236X/Y236X) and Sdccag8^(E451GfsX467/E451GfsX467),which carry truncating mutations of the mouse Sdccag8,corresponding to mutations that cause Bardet-Biedl syndrome(BBS)and Senior-L?ken syndrome(SLS)(c.696T>G p.Y232X and c.1339-1340ins G p.E447GfsX463)in humans,respectively.The two mutant Sdccag8 knock-in mice faithfully recapitulated human SDCCAG8-associated BBS phenotypes such as rod-cone dystrophy,cystic renal disorder,polydactyly,infertility,and growth retardation,with varied age of onset and severity depending on the hypomorphic strength of the Sdccag8 mutations.To the best of our knowledge,these knock-in mouse lines are the first BBS mouse models to present with the polydactyly phenotype.Major phototransduction protein mislocalization was also observed outside the outer segment after initiation of photoreceptor degeneration.Impaired cilia were observed in the mutant photoreceptors,renal epithelial cells,and mouse embryonic fibroblasts derived from the knock-in mouse embryos,suggesting that SDCCAG8 plays an essential role in ciliogenesis,and cilium defects are a primary driving force of SDCCAG8-associated retinal ciliopathies.

关 键 词：SDCCAG8 Primary cilia Retinal ciliopathy Bardet-Biedl syndrome(BBS) Senior-L?ken syndrome(SLS) Nephronophthisis(NPHP) POLYDACTYLY 

分 类 号：R774.1[医药卫生—眼科] R-332[医药卫生—临床医学]