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Ophthalmic Genet. 2011 Sep;32(3):181-7. doi: 10.3109/13816810.2011.567319. Epub 2011 Apr 4.

BBS mutational analysis: a strategic approach.

Author information

1
Genetics and Genome Biology Program, The Hospital for Sick Children, Toronto, Ontario, Canada.

Abstract

BACKGROUND:

Bardet-Biedl syndrome (BBS, OMIM 209900) is a rare autosomal recessive, clinically and genetically heterogeneous disorder with 15 genes identified. The large amount of coding sequence challenges the cost effectiveness of mutational analysis of BBS.

MATERIAL AND METHODS:

We present our mutational analysis experience (83 BBS families) in the context of the literature published up to September 2010, to provide a comprehensive tabulation of all BBS1-BBS12 mutant alleles and optimize a screening approach.

RESULTS:

We identified two BBS disease alleles in 76% of probands. Together BBS1, BBS2, BBS10 and BBS12 account for 82.4% of published unrelated alleles. On average 82% of published alleles are private. The 267 published principal mutations were positioned and analysis of their distribution allowed the design of a mutation screening strategy. Starting by screening for recurrent mutations, for example BBS1 M390R (10% of our cohort) and BBS10 C91LfsX5 (6% of our cohort), allowed a capture of 23.5% of the principal mutated alleles. Following a hierarchy of frequently involved exons, subsequent sequencing of the 4 most commonly involved genes, BBS1, BBS10, BBS2 and BBS12 could bring this mutation detection to at least 62%. The 16 most frequently recurring alleles could be identified with the use of simple screening methods such as restriction enzyme digest and ARMS assay and require sequencing in only a few instances.

CONCLUSION:

Our results suggest that mutational analysis of such a "rare" genetically heterogeneous condition benefits from pooling of data. This allows the development of efficient and cost-conscious screening mutational analysis strategies.

PMID:
21463199
DOI:
10.3109/13816810.2011.567319
[Indexed for MEDLINE]

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