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The molecular basis of X-linked spondyloepiphyseal dysplasia tarda.

Abstract：

:The X-linked form of spondyloepiphyseal dysplasia tarda (SEDL), a radiologically distinct skeletal dysplasia affecting the vertebrae and epiphyses, is caused by mutations in the SEDL gene. To characterize the molecular basis for SEDL, we have identified the spectrum of SEDL mutations in 30 of 36 unrelated cases of X-linked SEDL ascertained from different ethnic populations. Twenty-one different disease-associated mutations now have been identified throughout the SEDL gene. These include nonsense mutations in exons 4 and 5, missense mutations in exons 4 and 6, small (2-7 bp) and large (>1 kb) deletions, insertions, and putative splicing errors, with one splicing error due to a complex deletion/insertion mutation. Eight different frameshift mutations lead to a premature termination of translation and account for >43% (13/30) of SEDL cases, with half of these (7/13) being due to dinucleotide deletions. Altogether, deletions account for 57% (17/30) of all known SEDL mutations. Four recurrent mutations (IVS3+5G-->A, 157-158delAT, 191-192delTG, and 271-275delCAAGA) account for 43% (13/30) of confirmed SEDL cases. The results of haplotype analyses and the diverse ethnic origins of patients support recurrent mutations. Two patients with large deletions of SEDL exons were found, one with childhood onset of painful complications, the other relatively free of additional symptoms. However, we could not establish a clear genotype/phenotype correlation and therefore conclude that the complete unaltered SEDL-gene product is essential for normal bone growth. Molecular diagnosis can now be offered for presymptomatic testing of this disorder. Appropriate lifestyle decisions and, eventually, perhaps, specific SEDL therapies may ameliorate the prognosis of premature osteoarthritis and the need for hip arthroplasty.

journal_name

Am J Hum Genet

journal_title

American journal of human genetics

authors

Gedeon AK,Tiller GE,Le Merrer M,Heuertz S,Tranebjaerg L,Chitayat D,Robertson S,Glass IA,Savarirayan R,Cole WG,Rimoin DL,Kousseff BG,Ohashi H,Zabel B,Munnich A,Gecz J,Mulley JC

doi

10.1086/320592

subject

Has Abstract

pub_date

2001-06-01 00:00:00

pages

1386-97

issue

eissn

0002-9297

issn

1537-6605

pii

S0002-9297(07)61049-0

journal_volume

pub_type

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The molecular basis of X-linked spondyloepiphyseal dysplasia tarda.