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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Homozygosity for Waardenburg syndrome.

In a large kindred including many individuals affected with Waardenburg (WS) type 1 (WS1) syndrome, a child affected with a very severe form of WS type 3 was born. This child presented with dystopia canthorum, partial albinism, and very severe upper-limb defects. His parents were first cousins, both affected with a mild form of WS1. Molecular analysis of PAX3, the gene that was determined by linkage to cause the disorder in the family, demonstrated a novel missense mutation (S84F) in exon 2 of PAX3 within the paired box. While individuals affected with WS1 were heterozygous for the mutation, the child with WS3 was homozygous for S84F. The observation that the PAX3 homozygote in humans may allow life at least in early infancy and does not cause neural tube defects was unexpected, since, in all the mutations known in mice (splotch), homozygosity has led to severe neural tube defects and intrauterine or neonatal death.[1]


  1. Homozygosity for Waardenburg syndrome. Zlotogora, J., Lerer, I., Bar-David, S., Ergaz, Z., Abeliovich, D. Am. J. Hum. Genet. (1995) [Pubmed]
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