PuSH - Publication Server of Helmholtz Zentrum München: Diverse prevalence of large deletions within the OA1 gene in ocular albinism type 1 patients from Europe and North America.

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Bassi, M.T.* ; Bergen, A.A.* ; Bitoun, P.* ; Charles, S.J.* ; Clementi, M.* ; Gosselin, R.* ; Hurst, J.* ; Lewis, R.A.* ; Lorenz, B.* ; Meitinger, T.* ; Messiaen, L.* ; Ramesar, R.S.* ; Ballabio, A.* ; Schiaffino, M.V.*

Diverse prevalence of large deletions within the OA1 gene in ocular albinism type 1 patients from Europe and North America.

Hum. Genet. 108, 51-54 (2001)

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Open Access Green as soon as Postprint is submitted to ZB.

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Ocular albinism type 1 (OA1) is an X-linked disorder mainly characterized by congenital nystagmus and photodysphoria, moderate to severe reduction of visual acuity, hypopigmentation of the retina, and the presence of macromelanosomes in the skin and eyes. We have previously isolated the gene for OA1 and characterized its protein product as melanosomal membrane glycoprotein displaying structural and functional features of G protein-coupled receptors. We and others have identified mutations of various types within the OA1 gene in patients with this disorder, including deletions and splice site, frameshift, nonsense, and missense mutations. However, different prevalences of large intragenic deletions have been reported, ranging from 10% to 50% in independent studies. To determine whether these differences might be related to the geographic origin of the OA1 families tested, we performed a further extensive mutation analysis study leading to the identification of pathogenic mutations in 30 unrelated OA1 patients mainly from Europe and North America. These results, together with our earlier mutation reports on OA1, allow us to resolve the apparent discrepancies between previous studies and point to a substantial difference in the frequency of large intragenic deletions in European (<10%) compared with North American (>50%) OA1 families. These observations and our overall refinement of point mutation distribution within the OA1 gene have important implications for the molecular diagnosis of OA1 and for the establishment of any mutation detection program for this disorder.

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