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A novel P gene missense mutation in a Japanese patient with oculocutaneous albinism type II (OCA2)
Atsushi Kato1, Kazuyoshi Fukai, Naoki Oiso
1Department of Dermatology, Osaka City University Graduate School of Medicine, 1-4-3, Asahimachi Abenoku, Osaka 545-8585, Japan.
Background:
Oculocutaneous albinism type II (OCA2) is an autosomal recessively inherited disorder, characterized by white hair and skin, and loss of pigment in the eyes. Mutations in P gene have been shown to result in OCA2. So far, two cases have been reported from Japan.
Objective:
We had an opportunity to examine a case of albinism, and screened the mutations of tyrosinase and P gene.
Methods:
Genomic DNA was prepared from peripheral leukocytes. All of the exons and flanking introns of tyrosinase and P gene were PCR-direct-sequenced.
Results:
Although no mutations were found in tyrosinase, we found two missense substitutions, A481T and Q799H in P gene. The A481T has previously been shown to result in partial function of the P protein.
Conclusion:
The Q799H mutation is not a common polymorphism among normal Japanese, seems most likely to be a pathological OCA2 mutation among Japanese with this form of albinism.
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