Analysis of SLC4A11, ZEB1, LOXHD1, COL8A2 and TCF4 gene sequences in a multi-generational family with late-onset Fuchs corneal dystrophy

Tang,Hui; Zhang,Wen; Yan,Xin-Min; Wang,Lin-Ping; Dong,Hong; Shou,Tao; Lei,Huo; Guo,Qiang

doi:10.3892/ijmm.2016.2570

Analysis of SLC4A11, ZEB1, LOXHD1, COL8A2 and TCF4 gene sequences in a multi-generational family with late-onset Fuchs corneal dystrophy

Authors:
- Hui Tang
- Wen Zhang
- Xin-Min Yan
- Lin-Ping Wang
- Hong Dong
- Tao Shou
- Huo Lei
- Qiang Guo
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Affiliations: College of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming, Yunnan 650500, P.R. China, Department of Oncology, The First People's Hospital of Yunnan Province, Kunming, Yunnan 650032, P.R. China, Department of Ophthalmology, The First People's Hospital of Yunnan Province, Kunming, Yunnan 650032, P.R. China
Published online on: April 20, 2016 https://doi.org/10.3892/ijmm.2016.2570
Pages: 1487-1500
Copyright: © Tang et al. This is an open access article distributed under the terms of Creative Commons Attribution License.

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Abstract

The aim of the present study was to determine the genetic basis of a multi-generational family with late-onset (LO) Fuchs corneal dystrophy (FCD). Five FCD causal genes [solute carrier family 4, sodium borate transporter, member 11 (SLC4A11), zinc finger E-box binding homeobox 1 (ZEB1), lipoxygenase homology domains 1 (LOXHD1), collagen, type VIII, alpha 2 (COL8A2) and transcription factor 4 (TCF4)], previously reported to be implicated in the pathogenesis of FCD, were screened. A total of 27 variants [including 22 known single nucleotide polymorphisms (SNPs) from the Single Nucleotide Polymorphism Database (dbSNP) and 5 variants absent from dbSNP] were detected in this FCD pedigree across the SLC4A11, ZEB1, LOXHD1 and COL8A2 genes as follows: i) 22 known SNPs from dbSNP, including 3 coding (p.R161R, p.S213S and p.T833T) and 11 non-coding variants of SLC4A11, 2 intronic SNPs of ZEB1 from dbSNP (rs220057 and rs220060), 1 intronic SNP of LOXHD1 from dbSNP (rs16939650), and 5 SNPs of COL8A2 from dbSNP (p.A35A, p.R155Q, p.L335L, p.G495G and p.T502M); and ii) 5 variants that have not been previously reported in FCD patients and that are absent from dbSNP were identified across the ZEB1 and LOXHD1 genes; these included 3 continuous indels located at the junction of the 5’-UTR and the adjacent exon 1 of ZEB1 [Indel 1 (c.-86_-53delins gggaggggtggaggcggaggggtGGGGGGGAAGG); Indel 2 (c.-52_-46delinsGGGAGGG); and Indel 3 (c.-45_-42delinsAGGG)], and 2 intronic variants of LOXHD1 (c.5332-126C>T and c.1809+155G>A). Apart from one intronic SNP of SLC4A11 from dbSNP (rs372201212), the pathologic consequence of which is uncertain, and 2 intron variants of LOXHD1 (c.5332-126C>T and c.1809+155G>A); the variants likely represent examples of de novo mutations. Neither of the other 24 variants provided strong evidence of pathogenesis in this FCD pedigree. An analysis of 7 SNPs in TCF4 from dbSNP, which have been associated with LO FCD in different populations, revealed that these 7 SNPs were not associated with FCD in this specific pedigree. A genome‑wide linkage scan to search for linkage to one of the previously described FCD loci or to identify a novel locus for FCD will need to be performed in this FCD pedigree. Our observation, nevertheless, expands the knowledge of the genetic status of patients with FCD.

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