A Prevalent Mutation with Founder Effect in Xeroderma Pigmentosum Group C from North Africa

作者：Soufir Nadem^*; Ged Cecile; Bourillon Agnes; Austerlitz Frederic; Chemin Cecile; Stary Anne; Armier Jacques; Pham Daniele; Khadir Khadija; Roume Joelle; Hadj Rabia Smail; Bouadjar Bakar; Taieb Alain; de Verneuil Hubert; Benchiki Hakima; Grandchamp Bernard; Sarasin Alain

来源：Journal of Investigative Dermatology, 2010, 130(6): 1537-1542.

DOI：10.1038/jid.2009.409

Xeroderma pigmentosum (XP) is a rare autosomal recessive disorder that is associated with an inherited defect of the nucleotide excision repair pathway (NER). In this study, we investigated the involvement of XP genes in 86 XP patients belonging to 66 unrelated families, most of them consanguineous and originating from Maghreb. Sequencing analysis was performed either directly (44 probands) or after having previously characterized the involved XP gene by complementation assay (22 families). XPC and XPA mutations were respectively present in 56/66 and 8/66 probands. Strikingly, we identified the same homozygous frameshift mutation c.1643_1644delTG (p.Val548AlafsX25) in 87% of XP-C patients. Haplotype analysis showed a common founder effect for this mutation in the Mediterranean region, with an estimated age of 50 generations or 1,250 years. Among 7/8 XP-A patients, we found the previously reported nonsense homozygous XPA mutation (p.Arg228X). Six mutations-to our knowledge previously unreported ( five in XPC, one in XPA) were also identified. In conclusion, XPC appears to be the major disease-causing gene concerning xeroderma pigmentosum in North Africa. As the (p.Val548AlafsX25) XPC mutation is responsible for a huge proportion of XP cases, our data imply an obvious simplification of XP molecular diagnosis, at least in North Africa.

• 出版日期2010-6