A new locus for split hand/foot malformation with long bone deficiency (SHFLD) at 2q14.2 identified from a chromosome translocation.

Abstract:

:Split hand/foot malformation (SHFM) with long bone deficiency (SHFLD) is a distinct entity in the spectrum of ectrodactylous limb malformations characterised by associated tibial a/hypoplasia. Pedigrees with multiple individuals affected by SHFLD often include non-penetrant intermediate relatives, making genetic mapping difficult. Here we report a sporadic patient with SHFLD who carries a de novo chromosomal translocation t(2;18)(q14.2;p11.2). Characterisation of the breakpoints revealed that neither disrupts any known gene; however, the chromosome 2 breakpoint lies between GLI2 and INHBB, two genes known to be involved in limb development. To investigate whether mutation of a gene in proximity to the chromosome 2 breakpoint underlies the SHFLD, we sought independent evidence of mutations in GLI2, INHBB and two other genes (RALB and FLJ14816) in 44 unrelated patients with SHFM, SHFLD or isolated long bone deficiency. No convincing pathogenic mutations were found, raising the possibility that a long-range cis acting regulatory element may be disrupted by this translocation. The previous description of a translocation with a 2q14.2 breakpoint associated with ectrodactyly, and the mapping of the ectrodactylous Dominant hemimelia mouse mutation to a region of homologous synteny, suggests that 2q14.2 represents a novel locus for SHFLD.

journal_name

Hum Genet

journal_title

Human genetics

authors

Babbs C,Heller R,Everman DB,Crocker M,Twigg SR,Schwartz CE,Giele H,Wilkie AO

doi

10.1007/s00439-007-0390-7

subject

Has Abstract

pub_date

2007-09-01 00:00:00

pages

191-9

issue

2

eissn

0340-6717

issn

1432-1203

journal_volume

122

pub_type

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