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Mutation analysis of TGFBI and KRT12 in a case of concomitant keratoconus and granular corneal dystrophy.

Graefes Arch. Clin. Exp. Ophthalmol.2017 Sep;255(9):1779-1786. Epub 2017 May 31
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摘要


PURPOSE:This study is to summarize the concurrent keratoconus (KC) and granular corneal dystrophy (GCD) phenotype and identify the underlying genetic cause in a 23-year-old male patient. METHODS:A detailed family history and clinical data from the patient and his parents were collected by ophthalmologic examination. The candidate genes were captured and sequenced by targeted next-generation sequencing, and the results were confirmed by Sanger sequencing. RESULTS:The proband was clinically diagnosed as a case of concurrent KC and GCD, which is a very rare presentation. His father and grandmother were diagnosed as GCD in both eyes. There was no character of KC in his father's and grandmother's eyes. A heterozygous TGFBI mutation in exon 4 (c.370G > A) was identified in the proband, which was predicted to generate a missense mutation (p.R124H). The mutation also existed in his father and grandmother. A heterozygous KRT12 mutation in exon 8 (c.1456-1457ins GTA) was identified in the proband, which was predicted to generate an insert mutation and created a premature termination codon. The mutation did not exist in his father and grandmother. The two mutations did not exist in his mother and 200 unrelated normal controls. CONCLUSIONS:KC can co-exist with GCD. The missense mutation (c.370G > A) in the TGFBI gene and insert mutation (c.1456-1457ins GAT) in the KRT12 gene were identified in a 23-year-old male patient with concurrent KC and GCD.

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