Two coding single nucleotide polymorphisms in the SALL1 gene in Townes-Brocks syndrome: a case report and review of the literature.

Ying Liang, Dihua Shen, Wei Cai

Journal: Journal of pediatric surgery 2008;43(2):391-3

PMID: 18280297

Full Text on Elsevier Science View on PubMed

Abstract

Townes-Brocks syndrome (TBS) is an autosomal dominantly inherited malformation syndrome characterized by imperforate anus and limb and ear malformations with sensorineural hearing loss. Mutations in SALL1, a gene mapping to chromosome 16q21.1, are responsible for TBS. Here, we described a 16-month-old male patient with typical TBS clinical features including imperforate anus and preaxial polydactyly. Two coding polymorphism sites were identified in this case. One is silent (rs1965024, 2574 C > T), whereas the other yields a new codon encoding a different amino acid (rs4614723, 3823 G > A). The hot spot mutations in exon 2 were not suggested. Therefore, lack of SALL1 gene mutations and the presence of variable phenotypes in the sporadic cases might suggest DNA alternations in the noncoding regions of SALL1 gene and/or in other genes modulating SALL1 gene expression or functions.

Address: Department of Pediatric Surgery, Shanghai Institute for Pediatric Research, Xinhua Hospital Affiliated to School of Medicine, Shanghai Jiaotong University, Shanghai 200092, China.

DOI: 10.1016/j.jpedsurg.2007.09.079

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MeSH Terms: Abnormalities, Multiple, Anus, Imperforate, DNA Mutational Analysis, Ear, External, Follow-Up Studies, Forms and Records Control, Genetic Code, Hearing Loss, Sensorineural, Humans, Infant, Limb Deformities, Congenital, Male, Mutation, Polydactyly, Polymorphism, Single Nucleotide, Syndrome, Transcription Factors