Abstract
We have identified a novel RPGR gene mutation in a large Dutch family with X-linked retinitis pigmentosa (RP3). In affected members, a G-->T transversion was found at position +1 of the 5' splice site of intron 5 of the RPGR (retinitis pigmentosa GTPase regulator) gene. Analysis of this mutation at the RNA level showed cryptic splicing upstream of the mutation in exon 5 leading to a frameshift and downstream termination codon. Identification of the causative mutation in this family has facilitated the detection of females at risk of having an affected son.
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