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Genetic screening of LCA in Belgium: predominance of CEP290 and identification of potential modifier alleles in AHI1 of CEP290-related phenotypes.

par Coppieters, Frauke;Casteels, Ingele;Meire, Françoise ;De Jaegere, Sarah;Hooghe, Sally;Van Regemorter, Nicole ;Van Esch, Hilde;Matuleviciene, Ausra;Nunes, Luis;Meersschaut, Valérie;Walraedt, Sophie;Standaert, Lieve;Coucke, P.;Hoeben, Heidi;Kroes, Hester Y;Schurmans, Thierry ;de Ravel, Thomy;Leroy, Bart P;De Baere, Elfride
Référence Human mutation, 31, 10, page (E1709-E1766)
Publication Publié, 2010-10

Article révisé par les pairs

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Résumé :

Leber Congenital Amaurosis (LCA), the most severe inherited retinal dystrophy, is genetically heterogeneous, with 14 genes accounting for 70% of patients. Here, 91 LCA probands underwent LCA chip analysis and subsequent sequencing of 6 genes (CEP290, CRB1, RPE65, GUCY2D, AIPL1and CRX), revealing mutations in 69% of the cohort, with major involvement of CEP290 (30%). In addition, 11 patients with early-onset retinal dystrophy (EORD) and 13 patients with Senior-Loken syndrome (SLS), LCA-Joubert syndrome (LCA-JS) or cerebello-oculo-renal syndrome (CORS) were included. Exhaustive re-inspection of the overall phenotypes in our LCA cohort revealed novel insights mainly regarding the CEP290-related phenotype. The AHI1 gene was screened as a candidate modifier gene in three patients with the same CEP290 genotype but different neurological involvement. Interestingly, a heterozygous novel AHI1 mutation, p.Asn811Lys, was found in the most severely affected patient. Moreover, AHI1 screening in five other patients with CEP290-related disease and neurological involvement revealed a second novel missense variant, p.His758Pro, in one LCA patient with mild mental retardation and autism. These two AHI1 mutations might thus represent neurological modifiers of CEP290-related disease.