Abstract
Split-hand/foot malformation (SHFM) is a congenital limb deformity due to the absence or dysplasia of central rays of the autopod. Six SHFM loci have already been identified. Here we describe a Chinese family with autosomal-dominant SHFM1 that has previously been mapped to 7q21.2-21.3. The two affected family members, mother and son, showed deep median clefts between toes, ectrodactyly and syndactyly; the mother also showed triphalangeal thumbs. Exome sequencing and variant screening of candidate genes in the six loci known to be responsible for SHFM revealed a novel heterozygous mutation, c.558G>T (p.(Gln186His)), in distal-less homeobox 5 (DLX5). As DLX5 encodes a transcription factor capable of transactivating MYC, we also tested whether the mutation could affect DLX5 transcription acitivity. Results from luciferase reporter assay revealed that a mutation in DLX5 compromised its transcriptional activity. This is the first report of a mutation in DLX5 leading to autosomal-dominant SHFM1.
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Acknowledgements
We thank the family members for participating in our study, and Professor Joseph R Testa (Fox Chase Cancer Center, Philadelphia, PA) and Dr Mark D Minden (Department of Cellular and Molecular Biology, Ontario Cancer Institute, Toronto, Canada) for plasmids. This work was supported by grants from the Natural Science Foundation of China (81072452, 81273281) and Ph.D. Programs Foundation of Ministry of Education of China (20100131110035).
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Wang, X., Xin, Q., Li, L. et al. Exome sequencing reveals a heterozygous DLX5 mutation in a Chinese family with autosomal-dominant split-hand/foot malformation. Eur J Hum Genet 22, 1105–1110 (2014). https://doi.org/10.1038/ejhg.2014.7
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DOI: https://doi.org/10.1038/ejhg.2014.7
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