Bardet-Biedl syndrome in Denmark--report of 13 novel sequence variations in six genes

Human Mutation
Tina Duelund HjortshøjKaren Brøndum-Nielsen

Abstract

Bardet-Biedl syndrome (BBS) is an autosomal recessive disease characterized by retinal dystrophy, polydactyly, obesity, learning disabilities, renal involvement, and male hypogenitalism. BBS is genetically heterogeneous with mutations of 14 genes, accounting for approximately 70% of cases. Triallelic inheritance has been suggested in about 5% of cases. Forty-nine unrelated BBS patients were screened for mutations by DHPLC analysis in BBS1, BBS2, BBS4, BBS6/MKKS, BBS10, and BBS12. The selected genes either account for more than 5% of the mutational load or are commonly reported in triallelic inheritance. Eight patients with only one or no BBS mutation were further investigated by single nucleotide polymorphism (SNP) analysis. In total, mutations were detected in 44 patients. Twenty percent had two mutations in BBS1, 18% in BBS2, 4% in BBS9, 43% in BBS10, and 2% in BBS12. Five patients were heterozygous for a sequence variation in BBS6/MKKS. We found eight patients with three sequence variations in two genes, which could be explained by triallelic inheritance, by the prevalence of heterozygous carriers or the third sequence variations representing rare polymorphisms. All changes found in a second BBS gene were amino acid substitu...Continue Reading

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