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. 2007 Aug;44(8):537-40.
doi: 10.1136/jmg.2006.048736. Epub 2007 Apr 27.

Genotype phenotype correlation of 30 patients with Smith-Magenis syndrome (SMS) using comparative genome hybridisation array: cleft palate in SMS is associated with larger deletions

J Andrieux, C Villenet, S Quief, S Lignon, S Geffroy, C Roumier, H de Leersnyder, M-C de Blois, S Manouvrier, B Delobel, B Benzacken, P Bitoun, T Attie-Bitach, S Thomas, S Lyonnet, M Vekemans, J-P Kerckaert

Genotype phenotype correlation of 30 patients with Smith-Magenis syndrome (SMS) using comparative genome hybridisation array: cleft palate in SMS is associated with larger deletions

J Andrieux et al. J Med Genet. 2007 Aug.

Abstract

Background: Smith-Magenis syndrome (SMS) is rare (prevalence 1 in 25 000) and is associated with psychomotor delay, a particular behavioural pattern and congenital anomalies. SMS is often due to a chromosomal deletion of <4 Mb at the 17p11.2 locus, leading to haploinsufficiency of numerous genes. Mutations of one of these gemes, RAI1, seems to be responsible for the main features found with heterozygous 17p11.2 deletions.

Methods: We studied DNA from 30 patients with SMS using a 300 bp amplimers comparative genome hybridisation array encompassing 75 loci from a 22 Mb section from the short arm of chromosome 17.

Results: Three patients had large deletions (10%). Genotype-phenotype correlation showed that two of them had cleft palate, which was not found in any of the other patients with SMS (p<0.007, Fisher's exact test). The smallest extra-deleted region associated with cleft palate in SMS is 1.4 Mb, contains <16 genes and is located at 17p11.2-17p12. Gene expression array data showed that the ubiquitin B precursor (UBB) is significantly expressed in the first branchial arch in the fourth and fifth weeks of human development.

Conclusion: These data support UBB as a good candidate gene for isolated cleft palate.

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Conflict of interest statement

Competing interests: None declared.

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