Exp Mol Med.  2011 Jul;43(7):393-400. 10.3858/emm.2011.43.7.043.

Genome-wide scan of granular corneal dystrophy, type II: confirmation of chromosome 5q31 and identification of new co-segregated loci on chromosome 3q26.3

Affiliations
  • 1Department of Biochemistry, School of Medicine, Ewha Womans University, Seoul 158-710, Korea. hyung@ewha.ac.kr
  • 2Division of Structural and Functional Genomics, Center for Genome Science, Korea National Institute of Health, Osong 363-951, Korea.
  • 3Corneal Dystrophy Research Institute, Department of Ophthalmology, Yonsei University College of Medicine, Seoul 120-752, Korea.
  • 4National Institute of Health, Korea Centers for Disease, Control and Prevention, Osong 363-951, Korea.

Abstract

Granular corneal dystrophy, type II (CGD2; Avellino corneal dystrophy) is the most common corneal dystrophy among Koreans, but its pathophysiology is still poorly understood. Many reports showed that even though the causative mutation is the same TGFBI R124H mutation, there are severe and mild phenotypes of the corneal dystrophy. We also observed the phenotype differences in our samples. For this reason, we focused our effort on the identification of unknown genetic factor related to phenotype variation. A total 551 individuals from 59 families were genotyped with SNP chip and used in genome-wide linkage analysis. From single-point linkage analyses, we confirmed the known 5q31 region for TGFBI gene, and selected novel nine candidate loci for CGD2. In simulation analysis, the only 3q26.3 region including neuroligin 1 gene (NLGN1) was supported by empirical statistic significance. To investigate the effect of genetic heterogeneity in linkage analysis, we classified CGD2 families into two subgroups. Although we could not find a significant evidence for correlation between the 3q26.3 region and CGD2 phenotypes, this first genome-wide analysis with CGD2 families in Korea has a very important value for offering insights in genetics of CGD2. In addition, the co-segregating loci with CGD2 including 3q26.3 would be a good target for further study to understand the pathophysiology of CGD2.

Keyword

corneal dystrophies, hereditary; genome-wide association study; neurofibromin 2; polymorphism, single nucleotide; transforming growth factor beta1

MeSH Terms

Cell Adhesion Molecules, Neuronal/genetics
Chromosomes, Human, Pair 3/*genetics
Chromosomes, Human, Pair 5/*genetics
Computer Simulation
Corneal Dystrophies, Hereditary/*genetics
Female
Genetic Linkage
*Genetic Loci
*Genome-Wide Association Study
Genotype
Humans
Male
Models, Genetic
Polymorphism, Single Nucleotide
Transforming Growth Factor beta1/genetics
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