The empirical risk of retinitis pigmentosa in Japan

The empirical risk of hereditary retinitis pigmentosa (RP), was studied based on a survey of the data from 378 families with RP who were seen in Juntendo University hospital from 1980 to 1988. If the cases have had affected sibling, the empirical risk is 19% for the other siblings, and 29% if they h...

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Bibliographic Details
Published inNippon Ganka Gakkai zasshi Vol. 96; no. 2; p. 231
Main Authors Tanabe, U, Fujiki, K, Hayakawa, M, Nakajima, A, Kabasawa, K
Format Journal Article
LanguageJapanese
Published Japan 01.02.1992
Subjects
Adolescent
Adult
Child
Female
Genetic Counseling
Heterozygote
Humans
Japan - epidemiology
Male
Middle Aged
Prevalence
Retinitis Pigmentosa - epidemiology
Retinitis Pigmentosa - genetics
Risk
Japan
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Summary:The empirical risk of hereditary retinitis pigmentosa (RP), was studied based on a survey of the data from 378 families with RP who were seen in Juntendo University hospital from 1980 to 1988. If the cases have had affected sibling, the empirical risk is 19% for the other siblings, and 29% if they have parental consanguinity. Moreover the risk for male siblings is about 1.7 times higher than for female siblings. The prevalence in the general population of carriers with autosomal recessive hereditary RP was calculated to be about 0.8 to 1.7 in 100 persons. If a hereditary RP case marries a normal and unrelated partner, the risk is 0.4-0.9% for their child. If a case has many affected relatives (parents, grandparents, uncles or aunt etc), the risk is 24% for a son, and 30% for a daughter. Some normal persons among autosomal dominant families with incomplete penetrance are suspected to be carriers. The rate of penetration of the autosomal dominant gene was estimated to be 0.54. Therefore, the risk is 8.6% for the children of such persons. If the carriers are among X-linked families, the risk is 36% for their son. The risk is 1% or more for children of sporadic cases.
ISSN:0029-0203