| 300650 | ||||||
| ALBINISM, OCULAR, WITH LATE-ONSET SENSORINEURAL DEAFNESS; OASD | ||||||
| Alternative titles; symbols | ||||||
| OCULAR ALBINISM WITH SENSORINEURAL DEAFNESS DEAFNESS AND OCULAR ALBINISM | ||||||
| HGNC Approved Gene Symbol: OASD | ||||||
| Gene Phenotype Relationships | ||||||
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| Clinical Synopsis | ||||||
| TEXT | ||||||
| In a large Afrikaner kindred, Winship et al. (1984) observed 7 males in 4 sibships in 3 generations with the combination of typical ocular albinism and sensorineural deafness of late onset. Typicality of the ocular albinism was supported by numerous macromelanosomes demonstrated on skin biopsy of both affected males and carriers. Deafness was moderately severe by late middle age. The pedigree pattern was consistent with X-linked recessive inheritance. In the same large South African family, Winship et al. (1993) found tight linkage to the DXS452 locus at Xp22.3 using 25 informative meioses, with a maximum lod score of 7.1 at a recombination fraction of 0.0. Since OA1 (300500) has been mapped to Xp22.3-p22.2, Winship et al. (1993) suggested that OA1 and OASD may be allelic variants or that they may be due to contiguous gene defects. See 103470 for a similar but autosomal dominant disorder. The X-linked disorder described in 300700 differs by the presence of patchy, cutaneous hypo- and hyperpigmentation and the absence of significant eye involvement. | ||||||
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