Cytochrome P450 1B1 gene mutations in Japanese patients with primary congenital glaucoma(1).
OBJECTIVE
To report a novel missense mutation and DNA polymorphism of the CYP1B1gene in Japanese patients with primary congenital glaucoma.


METHODS
A series of 11 unrelated patients with primary congenital glaucoma was examined. Patients were followed in the Kagoshima University Hospital between 1979 and 1998. DNA was extracted from leukocytes of the patients, their families, and unrelated healthy individuals. Amplicons spanning the coding regions of the CYP1B1 gene were examined by direct sequencing and enzyme-restriction detection.


RESULTS
In the 11 unrelated patients, besides the previously reported insertional mutation (1620 ins G), a novel missense mutation was identified at codons 444 to replace arginine with glutamine (R444Q) in one patient. The novel missense mutation cosegregated in the relevant family as an autosomal recessive pattern and was not found in other patients or control individuals. In addition, five polymorphic sites were found at codons 48, 119, 330, 432, and 449. These polymorphic alleles did not cosegregate with the disease, and they were found in healthy individuals as well.


CONCLUSIONS
Approximately 20% of Japanese patients with primary congenital glaucoma may be affected by mutations in the CYP1B1 gene. Further studies are justified to explore whether a relationship exists between the phenotypic expressivity of the disease and the type of mutation.
Kakiuchi-Matsumoto
T
T
Department of Ophthalmology, Kagoshima University Faculty of Medicine, Sakuragaoka 8-35-1, Kagoshima 890-4520, Japan.
Isashiki
Y
Y
Ohba
N
N
Kimura
K
K
Sonoda
S
S
Unoki
K
K
D017668:Age of Onset; D001189:Aryl Hydrocarbon Hydroxylases; D002648:Child; D002675:Child, Preschool; D065633:Cytochrome P-450 CYP1B1; D003577:Cytochrome P-450 Enzyme System / Q000235:genetics*; D004252:DNA Mutational Analysis; D017931:DNA Primers / Q000737:chemistry; D005260:Female; D005901:Glaucoma / Q000151:congenital* / Q000208:ethnology / Q000235:genetics*; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D007564:Japan / Q000453:epidemiology; D008297:Male; D020125:Mutation, Missense; D010375:Pedigree; D016133:Polymerase Chain Reaction; D011110:Polymorphism, Genetic
D017931:DNA Primers; D003577:Cytochrome P-450 Enzyme System; D001189:Aryl Hydrocarbon Hydroxylases; C585496:CYP1B1 protein, human; D065633:Cytochrome P-450 CYP1B1