Objective To determine the disease-causing variants in a Chinese family with Leber congenital amaurosis (LCA) and characterize the clinical phenotypes. Methods This research was conducted at the Maternal and Child Health Hospital in Jiaxing and involved a family of which one member was an LCA patient and the other six members were not affected. Genomic DNA was extracted from the blood samples of all family members. We developed a panel for targeted exome sequencing (TES) of family members by selecting 283 known retina-related genes. Further bioinformatics analyses and Sanger sequencing were done to confirm the candidate variants. Results Ophthalmic examination of the patient showed a typical LCA phenotype. After TES and comprehensive analyses, two compound heterozygous variants (c.634G>A, p.V212M; c.-57+7T>G) were identified and one homozygous missense (c.764G>A, p.S255N) in the NMNAT1 gene which is responsible for causing LCA. Conclusion In this study, targeted exome sequencing revealed three variants in NMNAT1 that are likely to be the disease-causing variants of LCA.
濮清岚,苗正友,周巧云,李晶,孙琪. 利用目标区域捕获测序筛查Leber先天性黑矇的致病基因及其临床表型[J]. 中华眼视光学与视觉科学杂志, 2016, 18(3): 165-169.
Pu Qinglan,Miao Zhengyou,Zhou Qiaoyun,Li Jing,Sun Qi. Targeted exome sequencing identifies NMNAT1 variants in a family with Leber congenital amaurosis. Chinese Journal of Optometry Ophthalmology and Visual science, 2016, 18(3): 165-169. DOI: 10.3760/cma.j.issn.1674-845X.2016.03.008
Koenekoop RK. An overview of Leber congenital amaurosis: a model to understand human retinal development[J]. Surv Ophthalmol,2004,49(4):379-398. DOI:10.1016/j.survophthal.2004.04.003.
[2]
den Hollander AI, Roepman R, Koenekoop RK, et al. Leber congenital amaurosis: genes, proteins and disease mechanismas[J]. Prog Retin Eye Res,2008,27(4):391-419. DOI:10.1016/j.preteyeres.2008.05.003.
[3]
Chiang PW, Wang J, Chen Y, et al. Exome sequencing identifies NMNAT1 mutations as a cause of Leber congenital amaurosis[J]. Nat Genet,2012,44(9):972-974. DOI:10.1038/ng.2370.
Wang P, Guo X, Zhang Q. Further evidence of autosomal dominant Leber congenital amaurosis caused by heterozygous CRX mutation[J]. Graefes Arch Clin Exp Opthalmol,2007,245(9):1401-1402. DOI:10.1007/s00417-007-0554-0.
[6]
Keen TJ, Mohamed MD, Mckibbin M, et al. Identification of a locus (LCA9) for Leber′s congenital amaurosis on chromosome 1p36[J]. Eur J Hum Genet,2003,11(5):420-423. DOI:10.1038/ sj.ejhg.5200981.
[7]
Zhai RG, Cao Y, Hiesinger PR, et al. DrosophilaNMNAT maintains neural integrity independent of its NAD synthesis activity[J]. PLoS Biol,2006,4(12):e416. DOI:10.1371/journal.pbio.0040416.
[8]
Maguire AM, Simonelli F, Pierce EA, et al. Safety and efficacy of gene transfer for Leber′s congenital amaurosis[J]. N Engl J Med,2008,358(21):2240-2248. DOI:10.1056/NEJMoa0802315.
[9]
Abu-Safieh L, AlrashedM, AnaziS, et al. Autozygome-guided exome sequencing in retinal dystrophy patients reveals pathogenetic mutations and novel candidate disease genes[J]. Genome Res,2013,23(2):236-247. DOI:10.1101/gr.144105.112.
Bainbridge JW, Smith AJ, Barker SS, et al. Effect of gene therapy on visual function in Leber′s congenital amanrosis[J]. N Engl J Med,2008,358(21):2231-2239. DOI:10.1056/NEJMoa 0802268.
[12]
Hauswirth WW, Aleman TS, Kaushal S, et al. Treatment of leber congenital amaurosis due to RPE65 mutations by ocular subretinal iniection of adeno-associated virus gene vector: short-term results of a phase I trial[J]. Hum Gene Ther,2008,19(10):979-990. DOI:10.1089/hum.2008.107.
[13]
Cideciyan AV, Aleman TS, Boye SL, et al. Human genetherapy for RPE65 isomerase deficiency activates the retinoid cycle of vision but with slow rod kinetics[J]. Proc Natl Acad Sci USA,2008,105(39):15112-15117. DOI:10.1073/pnas.0807027105.