Open AccessThe pathogenicity of novel GUCY2D mutations in Leber congenital amaurosis 1 assessed by HPLC-MS/MS
Author(s) -
Feng Xue,
Wei Tang,
Junhui Sun,
Yuqin Luo,
Yanyan Huo,
Ping Yu,
Jiao Chen,
Xiaoming Wei,
Ming Qi,
Yinghui Ye
Publication year - 2020
Publication title -
plos one
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.99
H-Index - 332
ISSN - 1932-6203
DOI - 10.1371/journal.pone.0231115
Subject(s) - gucy2d , sanger sequencing , mutation , biology , genetics , point mutation , mutant , compound heterozygosity , gene , microbiology and biotechnology , cyclase , guanylate cyclase 2c , receptor
Leber congenital amaurosis (LCA) is a group of severe congenital retinal diseases. Variants in the guanylate cyclase 2D gene ( GUCY2D ), which encodes guanylate cyclase 1 (ROS-GC1), are associated with LCA1 and account for 6%–21% of all LCA cases. In this study, one family with LCA1 was recruited from China. A combination of next generation sequencing and Sanger sequencing was used to screen for disease-causing mutations. We found three novel mutations (c.139delC, p.Ala49Profs*36; c.835G>A, p.Asp279Asn and c.2783G>A, p.Gly928Glu) in the GUCY2D gene. Proband III-2 carries mutations c.139delC and c.2783G>A, which are inherited from the heterozygous mutation carriers, II-2 (c.139delC) and II-3 (c.2783G>A) that possess c.139delC and c.2783G>A. Additionally, II-8 carries heterozygous mutation c.835G>A. Sanger sequencing was used to confirm the presence of the three novel mutations in other family members. Mutation c.139delC results in a truncated protein. Mutations c.835G>A and c.2783G>A significantly reduce the catalytic activity of ROS-GC1. Our findings highlight the gene variants range of LCA. Moreover, HPLC-coupled tandem mass spectrometry (HPLC-MS/MS) was used to analyze the concentration of 3',5'-cyclic guanosine monophosphate (cGMP), suggesting that HPLC-MS/MS is an effective alternative method to evaluate the catalytic activity of wild-type and mutant ROS-GC1.