Homozygosity Mapping with SNP Arrays Identifies TRIM32, an E3 Ubiquitin Ligase, as a Bardet-Biedl Syndrome Gene (BBS11)

• Published in: Proceedings of the National Academy of Sciences - PNAS Vol. 103; no. 16; pp. 6287 - 6292
• Main Authors: Chiang, Annie P., Beck, John S., Yen, Hsan-Jan, Tayeh, Marwan K., Scheetz, Todd E., Swiderski, Ruth E., Nishimura, Darryl Y., Braun, Terry A., Kim, Kwang-Youn A., Huang, Jian, Elbedour, Khalil, Carmi, Rivka, Slusarski, Diane C., Casavant, Thomas L., Stone, Edwin M., Sheffield, Val C.
• Format: Journal Article
• Language: English
• Published: United States National Academy of Sciences 18-04-2006
• Subjects: Alleles; Animals; Arrays; Bardet-Biedl Syndrome - genetics; Biological Sciences; Chromosome Mapping; Danio rerio; DNA Mutational Analysis; Embryos; Enzymes; Gene expression; Genes; Genetic disorders; Genetic loci; Genetic mutation; Genetic screening; Genome, Human; Genotype & phenotype; Homozygote; Humans; Melanosomes; Messenger RNA; Mutation; Oligonucleotide Array Sequence Analysis; Phenotypes; Polymorphism, Single Nucleotide; Proteins; Transcription Factors - genetics; Transcription Factors - metabolism; Tripartite Motif Proteins; Ubiquitin-Protein Ligases - genetics; Zebrafish; Zebrafish Proteins - genetics
• ISSN: 0027-8424; 1091-6490
• DOI: 10.1073/pnas.0600158103

The identification of mutations in genes that cause human diseases has largely been accomplished through the use of positional cloning, which relies on linkage mapping. In studies of rare diseases, the resolution of linkage mapping is limited by the number of available meioses and informative marker density. One recent advance is the development of high-density SNP microarrays for genotyping. The SNP arrays overcome low marker informativity by using a large number of markers to achieve greater coverage at finer resolution. We used SNP microarray genotyping for homozygosity mapping in a small consanguineous Israeli Bedouin family with autosomal recessive Bardet-Biedl syndrome (BBS; obesity, pigmentary retinopathy, polydactyly, hypogonadism, renal and cardiac abnormalities, and cognitive impairment) in which previous linkage studies using short tandem repeat polymorphisms failed to identify a disease locus. SNP genotyping revealed a homozygous candidate region. Mutation analysis in the region of homozygosity identified a conserved homozygous missense mutation in the TRIM32 gene, a gene coding for an E3 ubiquitin ligase. Functional analysis of this gene in zebrafish and expression correlation analyses among other BBS genes in an expression quantitative trait loci data set demonstrate that TRIM32 is a BBS gene. This study shows the value of high-density SNP genotyping for homozygosity mapping and the use of expression correlation data for evaluation of candidate genes and identifies the proteasome degradation pathway as a pathway involved in BBS.