Abstract
The pathogenesis of high-altitude pulmonary edema (HAPE) has been at least partially attributed to the local dysregulation of the renin–angiotensin–aldosterone system (RAAS) cascade. To address this issue, we conducted the largest nested case-control study to-date to explore the association between variations in RAAS genes and HAPE in Chinese population. We recruited 140 HAPE patients and 144 controls during the construction of Qinghai-Tibet railway and genotyped 10 gene polymorphisms evenly interspersed in 5 RAAS candidate genes. The data were analyzed by haplotype and multifactor dimensionality reduction (MDR). The single-locus analysis showed that CYP11B2 C-344T and K173R and ACE A-240T polymorphisms were significantly associated with HAPE after Bonferroni correction (P < 0.005). The linkage analysis constructed a linkage block including C-344T and K173R polymorphisms in complete linkage disequilibrium with each other, while occurred with significantly different frequencies between HAPE and control groups. The gene-gene interaction analysis found the overall best model including ACE A-240T and A2350G and CYP11B2 C-344T polymorphisms with strong synergistic effect. This model had a maximum testing accuracy of 68.61% and a maximum cross validation consistency of 9 out of 10 (P = 0.004). The homozygous genotype combination of −240AA, 2350GG and −344TT conferred high genetic susceptibility to HAPE, which was further strengthened by haplotype analysis. Our results add evidence for synergistic effect of RAAS gene polymorphisms on HAPE susceptibility. Moreover, we proposed a promising data-mining analytical approach (MDR) for detecting and characterizing gene-gene interactions.
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Acknowledgements
We heartily thank the kind assistance and support of the faculty and doctors at battlefront. We also gratefully thank the dedicators for their enthusiastic participation. Our work is supported by three item National Science Foundation of China (Grant No. 30393130, 30470651 and 30271152) and National Basic Research Program (973 project) (2006 CB 504163).
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Qi, Y., Niu, W., Zhu, T. et al. Synergistic effect of the genetic polymorphisms of the renin–angiotensin–aldosterone system on high-altitude pulmonary edema: a study from Qinghai-Tibet altitude. Eur J Epidemiol 23, 143–152 (2008). https://doi.org/10.1007/s10654-007-9208-0
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DOI: https://doi.org/10.1007/s10654-007-9208-0