Dinucleotide polymorphism of p73 gene is associated with a reduced risk of lung cancer in a Chinese population.

Journal Article (Journal Article)

p73, a structural and functional homologue of p53, shares some p53-like tumor suppressor activity but also possesses oncogenic activity. Therefore, p73 plays an important role in modulating cell-cycle control and apoptosis. A potentially functional dinucleotide polymorphism, G4C14-to-A4T14, has been identified in the 5' untranslated region (UTR) of exon 2 of the p73 gene, which may theoretically form a stem-loop structure and affect gene expression. To test the hypothesis that these 2 common variants play a role in lung cancer susceptibility, we conducted a case-control study of 425 lung cancer patients and 588 cancer-free controls frequency-matched to the cases on age and sex in a Chinese population. The results showed that these 2 polymorphisms were in complete linkage disequilibrium and the frequencies of variant p73 AT haplotype (A4T14) were less common in the cases (0.225) than in the controls (0.287) (p = 0.0018), suggesting that this AT haplotype was protective against lung cancer. Compared to the p73 GC/GC homozygotes, both the AT/AT variant homozygotes and GC/AT heterozygotes were associated with a significantly decreased risk (adjusted OR: 0.45, 95% CI: 0.26-0.80 and OR: 0.70, 95% CI: 0.53-0.92, respectively). These results suggest that this p73 dinucleotide polymorphism may have a role in lung cancer susceptibility in our study population. Further studies are needed to elucidate potential functional relevance of the p73 AT variant allele.

Full Text

Duke Authors

Cited Authors

  • Hu, Z; Miao, X; Ma, H; Tan, W; Wang, X; Lu, D; Wei, Q; Lin, D; Shen, H

Published Date

  • April 10, 2005

Published In

Volume / Issue

  • 114 / 3

Start / End Page

  • 455 - 460

PubMed ID

  • 15578704

International Standard Serial Number (ISSN)

  • 0020-7136

Digital Object Identifier (DOI)

  • 10.1002/ijc.20746


  • eng

Conference Location

  • United States