A gene for Waardenburg syndrome type 2 maps close to the human homologue of the microphthalmia gene at chromosome 3p12-p14.1.
Waardenburg syndrome (WS), an autosomal dominant syndrome of hearing loss and pigmentary disturbances, comprises at least two separate conditions. WS type 1 is normally caused by mutations in PAX3 located at chromosome 2q35 and is distinguished clinically by minor facial malformations. We have now located a gene for WS type 2. Two families show linkage to a group of microsatellite markers located on chromosome 3p12-p14.1. D3S1261 gave a maximum lod score of 6.5 at zero recombination in one large Type 2 family. In a second, smaller family the adjacent marker D3S1210 gave a lod of 2.05 at zero recombination. Interestingly, the human homologue (MITF) of the mouse microphthalmia gene, a good candidate at the phenotypic level, has recently been mapped to 3p12.3-p14.4.
Department of Medical Genetics, Belfast City Hospital, UK.
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Hughes
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Newton
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Liu
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D000818:Animals; D002874:Chromosome Mapping; D002893:Chromosomes, Human, Pair 3; D004276:DNA, Satellite / Q000235:genetics; D005260:Female; D005799:Genes, Dominant; D008040:Genetic Linkage; D005819:Genetic Markers; D006801:Humans; D008297:Male; D051379:Mice; D008850:Microphthalmos / Q000235:genetics*; D010375:Pedigree; D014849:Waardenburg Syndrome / Q000145:classification / Q000235:genetics*
D004276:DNA, Satellite; D005819:Genetic Markers