A novel stable polyalanine [poly(A)] expansion in the HOXA13 gene associated with hand-foot-genital syndrome: proper function of poly(A)-harbouring transcription factors depends on a critical repeat length?

Abstract:

:Hand-foot-genital syndrome (HFGS) is a dominantly inherited congenital malformation affecting the distal limbs and genitourinary tract. Here, we describe the phenotype and its molecular basis in a family that presented with HFGS. Genetic analysis revealed that the condition is caused by an 18-bp in-frame duplication within a cryptic trinucleotide repeat sequence encoding an 18-residue polyalanine tract in the homeoboxgene ( HOX) A13. This mutation expands the stretch with six extra alanine residues. Similar types of mutation (plus eight alanines) have recently been found in another HFGS family and also in the human HOXD13 gene (plus seven up to plus 14 residues) where it leads to synpolydactyly (SPD), a further congenital limb malformation rarely associated with genital abnormalities. As observed in our family, all the expanded tracts encoding polyalanine, either reported for HOXA13 or HOXD13, are quite stable when transmitted within affected families. Unlike disorders with unstable expansions of perfect trinucleotide repeats the molecular mechanism underlying these polyalanine expansions should be unequal crossing-over rather than replication slippage. The alanine tract elongation may prevent protein-protein interactions of the mutant HOXA13, thereby inducing a localized heterochrony in the sequence of distal limb and genitourinary development.

journal_name

Hum Genet

journal_title

Human genetics

authors

Utsch B,Becker K,Brock D,Lentze MJ,Bidlingmaier F,Ludwig M

doi

10.1007/s00439-002-0712-8

keywords:

subject

Has Abstract

pub_date

2002-05-01 00:00:00

pages

488-94

issue

5

eissn

0340-6717

issn

1432-1203

journal_volume

110

pub_type

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