Mutations in the SALL1 putative transcription factor gene cause Townes-Brocks syndrome

Nature Genetics
Jürgen KohlhaseW Engel


Townes-Brocks syndrome (TBS, OMIM #107480) is a rare autosomal-dominant malformation syndrome with a combination of anal, renal, limb and ear anomalies. Cytogenetic findings suggested that the gene mutated in TBS maps to chromosome 16q12.1, where SALL1 (previously known as HSAL1), a human homologue of spalt (sal), is located. SAL is a developmental regulator in Drosophila melanogaster and is conserved throughout evolution. No phenotype has yet been attributed to mutations in vertebrate sal-like genes. The expression patterns of sal-like genes in mouse, Xenopus and the fish Medaka, and the finding that Medaka sal is regulated by Sonic hedgehog (Shh; ref. 11), prompted us to examine SALL1 as a TBS candidate gene. Here we demonstrate that SALL1 mutations cause TBS in a family with vertical transmission of TBS and in an unrelated family with a sporadic case of TBS. Both mutations are predicted to result in a prematurely terminated SALL1 protein lacking all putative DNA binding domains. TBS therefore represents another human developmental disorder caused by mutations in a putative C2H2 zinc-finger transcription factor.


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