Back to Search
Start Over
A nonsynonymous single-nucleotide polymorphism in the PDZ-Rho guanine nucleotide exchange factor (Ser1416Gly) modulates the risk of lung cancer in Mexican Americans.
- Source :
-
Cancer [Cancer] 2006 Jun 15; Vol. 106 (12), pp. 2716-24. - Publication Year :
- 2006
-
Abstract
- Background: Based on in vitro studies, Rho guanine nucleotide exchange factors (RhoGEFs) are key regulators of mitogenic and transforming pathways. At least 1 family member, PDZ-RhoGEF, also integrates signaling between monomeric Rho G proteins and heterotrimeric G proteins through a so-called regulator of G-protein signaling (RGS) domain. Recently, the authors reported that 3 single-nucleotide polymorphisms (SNPs) in 2 members of the RGS family were associated with significant reductions in the risk of cancer.<br />Methods: For the current report, the authors studied the risk of lung cancer associated with a nonsynonymous SNP (rs868188; Ser1416Gly) in PDZ-RhoGEF in a large lung cancer case-control study of 2260 Caucasians and 369 Mexican Americans.<br />Results: Compared with individuals who had the wild-type genotype (AA), Mexican Americans with the variant genotypes (AG and GG) had a significantly reduced risk for lung cancer (odds ratio [OR], 0.57; 95% confidence interval [95%CI], 0.34-0.94). The protective effect appeared to be more evident in younger individuals (OR, 0.42; 95%CI, 0.20-0.91), men (OR, 0.36; 95%CI, 0.18-0.71), and ever smokers (OR, 0.50; 95%CI, 0.29-0.88). A joint effect was observed between Ser1416Gly and polymorphisms in 2 cell-cycle control genes: p53 (intron 3) and cyclin D1 (CCND1). Tallying the variant alleles of the 4 RGS gene SNPs, a gene-dosage effect was apparent. Compared with individuals who had < 3 variant alleles, patients with > or = 3 variant alleles had a 51% reduction in lung cancer risk (OR, 0.49; 95%CI, 0.28-0.88).<br />Conclusions: To the authors' knowledge, this is the first epidemiological study to link PDZ-RhoGEF polymorphisms with cancer risk. The results suggest that there are interactions between RGS2, RGS6, and PDZ-RhoGEF and validate this family of proteins as key regulators of tumorigenesis.<br /> (Copyright 2006 American Cancer Society.)
- Subjects :
- Aged
Alleles
Case-Control Studies
Cell Transformation, Neoplastic genetics
Cell Transformation, Neoplastic pathology
Cyclin D1 genetics
Cyclin D1 physiology
DNA, Neoplasm analysis
DNA, Neoplasm genetics
Female
GTP-Binding Proteins physiology
Genotype
Glycine analysis
Guanine Nucleotide Exchange Factors chemistry
Guanine Nucleotide Exchange Factors physiology
Humans
Lung Neoplasms epidemiology
Lung Neoplasms ethnology
Male
Middle Aged
Odds Ratio
Rho Guanine Nucleotide Exchange Factors
Risk Factors
Serine analysis
Signal Transduction physiology
Tumor Suppressor Protein p53 genetics
Tumor Suppressor Protein p53 physiology
Guanine Nucleotide Exchange Factors genetics
Lung Neoplasms genetics
Mexican Americans genetics
Polymorphism, Single Nucleotide genetics
Subjects
Details
- Language :
- English
- ISSN :
- 0008-543X
- Volume :
- 106
- Issue :
- 12
- Database :
- MEDLINE
- Journal :
- Cancer
- Publication Type :
- Academic Journal
- Accession number :
- 16691626
- Full Text :
- https://doi.org/10.1002/cncr.21944