Abstract
The poly(ADP-ribose) polymerase (PADPRP) gene (13q33-qter) depicts a two-allele (A/B) polymorphism. In the noncancer population, the frequency of the B allele is higher among blacks than among whites. Since the incidence of multiple myeloma and prostate and lung cancer is higher in the U.S. black population, we have analyzed the B-allele frequency in germ-line DNA to determine whether the PADPRP gene correlates with a polymorphic susceptibility to these diseases. For multiple myeloma and prostate cancer, an increased frequency of the B allele appeared to be striking only in black patients. In contrast, the distribution of the B allele in germ-line DNA did not differ among white patients with these diseases, when compared with the control group. An elevated B-allele frequency was also found in germ-line DNA in blacks with colon cancer. These observations suggest that the PADPRP polymorphism may provide a valid marker for a predisposition to these cancers in black individuals. To determine the genomic structure of the polymorphic PADPRP sequences, a 2.68-kb HindIII clone was isolated and sequenced from a chromosome 13-enriched library. Sequence analysis of this clone (A allele) revealed a close sequence similarity (91.8%) to PADPRP cDNA (1q42) and an absence of introns, suggesting that the gene on 13q exists as a processed pseudogene. A 193-bp conserved duplicated region within the A allele was identified as the source of the polymorphism. The nucleotide differences between the PADPRP gene on chromosome 13 and related PADPRP genes were exploited to develop oligonucleotides that can detect the difference between the A/B genotypes in a PCR. This PCR assay offers the opportunity for analyzing additional black cancer patients, to determine how the PADPRP processed pseudogene or an unidentified gene that cosegregates with the PADPRP gene might be involved with the development of malignancy.
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Selected References
These references are in PubMed. This may not be the complete list of references from this article.
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