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. 1988 Apr;85(7):2210–2214. doi: 10.1073/pnas.85.7.2210

Human retinoblastoma susceptibility gene: genomic organization and analysis of heterozygous intragenic deletion mutants.

R Bookstein 1, E Y Lee 1, H To 1, L J Young 1, T W Sery 1, R C Hayes 1, T Friedmann 1, W H Lee 1
PMCID: PMC279959  PMID: 2895471

Abstract

A gene in chromosome region 13q14 has been identified as the human retinoblastoma susceptibility (RB) gene on the basis of altered gene expression found in virtually all retinoblastomas. In order to further characterize the RB gene and its structural alterations, we examined genomic clones of the RB gene isolated from both a normal human genomic library and a library made from DNA of the retinoblastoma cell line Y79. First, a restriction and exon map of the RB gene was constructed by aligning overlapping genomic clones, yielding three contiguous regions ("contigs") of 150 kilobases total length separated by two gaps. At least 20 exons were identified in genomic clones, and these were provisionally numbered. Second, two overlapping genomic clones that demonstrated a DNA deletion of exons 2 through 6 from one RB allele were isolated from the Y79 library. To confirm and extend this result, a unique sequence probe from intron 1 was used to detect similar and possibly identical heterozygous deletions in genomic DNA from three retinoblastoma cell lines, thereby explaining the origins of their shortened RB mRNA transcripts. The same probe detected genomic rearrangements in fibroblasts from two hereditary retinoblastoma patients, indicating that intron 1 includes a frequent site for mutations conferring predisposition to retinoblastoma. Third, this probe also detected a polymorphic site for BamHI with allele frequencies near 0.5/0.5. Identification of commonly mutated regions will contribute significantly to genetic diagnosis in retinoblastoma patients and families.

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