AI Article Synopsis
- HOXD13 is a homeobox gene located at chromosome 2q31.1, and mutations in this gene are often linked to limb malformations, particularly synpolydactyly.
- A novel mutation (758-2delA) was found in a family with foot abnormalities, specifically bilateral partial duplication of the 2nd metatarsals, despite not having the typical synpolydactyly symptoms.
- This mutation affects the splice site of exon 2, likely disrupting normal splicing of HOXD13 and supporting the idea that haploinsufficiency of this gene can lead to unique phenotypes.
Article Abstract
HOXD13 is the most 5' of the HOXD cluster of homeobox genes in chromosome band 2q31.1. Heterozygous expansions of a polyalanine tract in HOXD13 are typically associated with synpolydactyly characterized by insertional digit duplication associated with syndactyly. We screened for mutations of HOXD13 in patients with a variety of limb malformations and identified a novel heterozygous mutation (758-2delA) in a three-generation family without the typical synpolydactyly phenotype in the hands, but with bilateral partial duplication of the 2nd metatarsals within the first web space of the feet. This mutation locates in the acceptor splice site of exon 2 and is predicted to cause failure of normal splicing of HOXD13. The foot abnormality in this family is similar to that described in two families by Goodman et al. [1998: Am. J. Hum. Genet. 63: 992-1000] in which different deletions of HOXD13 were reported. These findings together lend support to a distinct phenotype resulting from haploinsufficiency of HOXD13.
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| http://dx.doi.org/10.1002/ajmg.a.20103 | DOI Listing |
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