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© 1994 Oxford University Press

OTHER

A new locus for autosomal dominant retinitis pigmentosa on the short arm of chromosome 17

Jacquie Greenberg*, Rene Goliath, Peter Beighton and Rajkumar Ramesar

MRC Research Unit for Medical Genetics, Department of Human Genetics, University of Cape Town Medical School Observatory 7925, South Africa

*To whom correspondence should be addressed

Received February 1, 1994; Revised April 9, 1994; Accepted April 9, 1994

Retinitis pigmentosa (RP) is a group of genetically and clinically heterogeneous retinopathies, some of which have been shown to result from mutations in two different known retinal genes, rhodopsin (3q) and peripherin-rds (6p). Three additional anonymous loci at 7p, 7q and pericentric 8 have been implicated by linkage studies. There are still, however, a few families in which all known loci have been excluded. In this report we present data indicating a location, on the short arm of chromosome 17, for the autosomal dominant RP (ADRP) locus in a large South African (SA) family of British ancestry. Positive two-point lod scores have been obtained for nine markers (D17S938, Z = 5.43; D17S796, Z = 4.82; D17S849, Z = 3.6; D17S786, Z = 3.55; TP53, Z = 3.55; D17S578, Z = 3.29; D17S960, Z = 3.16; D17S926, Z = 1.51; D17S804, Z = 0.47 all at {theta} = 0.10 except D17S804 and D17S926, {theta} = 0.20). These data provide definitive evidence for the localization of an ADRP gene on chromosome 17p. The human recoverin gene has been localized to 17p13.1 and was consequently a prime candidate for ADRP in the family studied. However, mutation screening of the three exons of this gene failed to produce any evidence of recoverin being the gene involved in the pathogenesis of ADRP in this SA family.


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