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TGFBI Gene Mutation Analysis in Chinese Families with Corneal Dystrophies.

AIMS: To identify transforming growth factor beta-induced (TGFBI) gene mutations in four Chinese families affected by corneal dystrophies.

METHODS: In this study, three families (21 patients and 18 normal relatives), respectively, with Reis-Bücklers corneal dystrophy (RBCD), classic lattice corneal dystrophy (LCDI), and variant LCD (LCDI/IIIA) were assessed. All subjects underwent a complete ophthalmological evaluation, including biomicroscopic inspection and dilated fundus examination. As a control, 100 individuals without corneal disease were selected from the general population. Polymerase chain reaction (PCR) and direct sequencing were used to screen for mutations in TGFBI.

RESULTS: For the three families, a single heterozygous c.371G>T (R124L) point mutation was found in exon 4 of TGFBI in 14 affected members with RBCD, a single heterozygous c.370C>T (R124C) point mutation was found in exon 4 of TGFBI in four affected members with LCDI, and a single heterozygous c.1877A>G (H626R) point mutation was found in exon 14 of TGFBI in four affected members with LCDI/IIIA. TGFBI gene mutation had not been detected in the unaffected members and 100 normal controls.

CONCLUSIONS: TGFBI gene mutations were present in all three Chinese families with corneal dystrophy, and our study further verified the relationship between phenotype and genotype of corneal dystrophy.

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