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• W2078748462 abstract "<h3>Objective:</h3> The disparate occurrence of few cases of retinoblastoma in the same extended pedigree confronts us with the unsolved problem of a low-penetrant autosomal-dominant trait vs fortuitous familial aggregation of sporadic cases. Determination as to whether the disease arises from a common inherited mutation or sporadic mutations has important implications for genetic counseling. This is illustrated in this report of two presumed low-penetrant retinoblastoma pedigrees characterized by two distantly affected relatives connected through apparently healthy carriers. <h3>Design:</h3> We mathematically modeled the inheritance patterns and calculated the a priori relative probabilities of heredity with low penetrance vs chance occurrence of independent mutations for each pedigree. The derived odds clearly show that the disease, which occurred twice in each family, most likely resulted from unrelated mutations. To prove this, extensive DNA testing was conducted, including determination of intragenic<i>RB1</i>DNA sequence polymorphisms and screening for mutation using the polymerase chain reaction coupled with single-strand conformation polymorphism analysis. <h3>Patients:</h3> All living key members from both pedigrees were included. <h3>Results:</h3> Consistent with our initial expectation, there was no common intragenic haplotype or common germline mutation that segregated with the disease phenotype in either of these two families. <h3>Conclusions:</h3> We therefore conclude that collateral incidence of retinoblastoma in these two pedigrees occurred by chance and not according to autosomal-dominant inheritance with low penetrance. Furthermore, our data provide the first evidence, to our knowledge, that related individuals may have independent mutations involving an identical gene locus, giving rise to an artefactual inheritance pattern." @default.
• W2078748462 created "2016-06-24" @default.
• W2078748462 creator A5086070782 @default.
• W2078748462 date "1993-11-01" @default.
• W2078748462 modified "2023-10-11" @default.
• W2078748462 title "Pseudo Low Penetrance in Retinoblastoma" @default.
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• W2078748462 doi "https://doi.org/10.1001/archopht.1993.01090110073028" @default.
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