Summary
Loss of function of both copies of the RB1 gene is a causal event in the development of retinoblastoma. The predisposition to this tumor can be inherited as an autosomal dominant trait. Direct detection of the genetic defect is important for presymptomatic DNA diagnosis and genetic counseling in families with hereditary retinoblastoma. We have used multiplex polymerase chain reaction and high-resolution polyacrylamide gel electrophoresis to detect RB1 gene deletions as small as one base pair. By using three independent sets of amplification reactions, which cover 26% of the RB1 gene coding region, we identified RB1 gene deletions in the DNA of peripheral blood cells in 3 out of 24 (12.5%) unrelated patients with hereditary retinoblastoma. In one case, formalin-fixed paraffin-embedded tumor material was also used to detect the mutation. Sequencing of the mutated alleles revealed deletions of 1, 3 and 10 base pairs. Each deleted region was flanked by direct repeats.
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Lohmann, D., Horsthemke, B., Gillessen-Kaesbach, G. et al. Detection of small RB1 gene deletions in retinoblastoma by multiplex PCR and high-resolution gel electrophoresis. Hum Genet 89, 49–53 (1992). https://doi.org/10.1007/BF00207041
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DOI: https://doi.org/10.1007/BF00207041