Format

Send to

Choose Destination
Can J Ophthalmol. 2008 Oct;43(5):596-9. doi: 10.3129/i08-143.

Molecular analysis of the XLRS1 gene in 4 females affected with X-linked juvenile retinoschisis.

Author information

1
Department of Biological and Biomedical Sciences, Aga Khan University, Karachi, Pakistan. ds436@medschl.cam.ac.uk

Abstract

BACKGROUND:

X-linked juvenile retinoschisis (XLRS) is the most common cause of juvenile macular degeneration in males. Because of its X-linked mode of transmission, the disease is rare in females. In this article, we describe a mutation screen conducted on a family in which 4 female patients affected with XLRS presented with an unusually severe phenotype.

METHODS:

DNA was extracted from peripheral blood, and the XLRS1 gene was amplified on DNA samples of all the available family members. The mutation screen was conducted by performing direct DNA sequencing using an MJ Research PTC-225 Peltier Thermal Cycler.

RESULTS:

A novel mutation, 588-593ins.C, was identified in exon 6 of the gene. The affected father was found to be heterozygous for the mutation, whereas all the female patients were homozygous for this mutation. The homozygosity of the mutation in the affected females led to severe phenotypes. The defective allele was expressed in infancy in 1 patient, whereas the disease manifested itself at variable ages in the other patients, reflecting a variation in the phenotype.

INTERPRETATION:

This report describes a novel mutation in a family in which consanguinity has led to XLRS in 4 females. A variation in the phenotype of the disease is consistent with the published literature and suggests the involvement of genetic modifiers or environmental factors in influencing the clinical severity of the disease.

PMID:
18982040
DOI:
10.3129/i08-143
[Indexed for MEDLINE]

Supplemental Content

Full text links

Icon for Elsevier Science
Loading ...
Support Center