Abstract
X-linked juvenile retinoschisis (RS) is a bilateral vitreoretinal disorder with no known cure. The gene responsible for the disease was recently isolated by positional cloning methods and a spectrum of mutations has been described in families with RS pathology. In this report, we screened six sporadic cases of RS for mutations in the RS gene to understand the etiology of isolated cases. Our extensive studies revealed a novel 4 bp insertion in one family and the remaining families did not show mutations in the RS gene. This mutation altered the reading frame including codon 55 resulting in nine aberrant amino acid residues. The unaffected mother did not contain this mutation. Additionally, it was not found in 60 normal control chromosomes, suggesting that the insertion mutation is disease related in the family analyzed.
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