Novel mutation in FZD4 gene in a Japanese pedigree with familial exudative vitreoretinopathy.
OBJECTIVE
To identify the genetic defect in the FZD4 gene responsible for familial exudative vitreoretinopathy (FEVR) in a Japanese family.


METHODS
Interventional case report.


METHODS
Complete ophthalmologic examinations were performed, and the FZD4 gene was analyzed by direct genomic sequencing.


RESULTS
Fundus examination of a 13-year-old Japanese girl who had had esotropia and exudative retinal detachment at 3 years exhibited peripheral avascular areas bilaterally, a dragged disk, and retinal holes unilaterally. In contrast, her asymptomatic father had only bilateral avascular areas in the peripheral retina. Molecular genetic analysis revealed that both the proband and her father had a heterozygous missense mutation of A to G at 1026 bp of the FZD4 gene (Met342Val).


CONCLUSIONS
A novel mutation in the FZD4 gene was identified in Japanese patients with FEVR. Our observations support the hypothesis that the FZD4-associated FEVR might represent a milder form than that associated with other genetic origins.
Department of Ophthalmology, Kyushu University Graduate School of Medical Sciences, Fukuoka, Japan. yosida@med.kyushu-u.ac.jp <yosida@med.kyushu-u.ac.jp>
Shigeo
S
Yoshida
Ryo-Ichi
R
Arita
Ayako
A
Yoshida
Hanayo
H
Tada
Aki
A
Emori
Yoshihiro
Y
Noda
Shintaro
S
Nakao
Kimihiko
K
Fujisawa
Tatsuro
T
Ishibashi
D000293:Adolescent; D018389:Codon, Nonsense / Q000235:genetics; D004252:DNA Mutational Analysis; D015785:Eye Diseases, Hereditary / Q000235:genetics* / Q000473:pathology; D005260:Female; D051157:Frizzled Receptors; D006801:Humans; D007564:Japan; D020125:Mutation, Missense; D010375:Pedigree; D011506:Proteins / Q000235:genetics*; D011956:Receptors, Cell Surface / Q000235:genetics; D043562:Receptors, G-Protein-Coupled; D012164:Retinal Diseases / Q000235:genetics* / Q000473:pathology; D014822:Vitreous Body
D018389:Codon, Nonsense; C402930:FZD4 protein, human; D051157:Frizzled Receptors; D011506:Proteins; D011956:Receptors, Cell Surface; D043562:Receptors, G-Protein-Coupled