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  • Title: Truncating variants in p53AIP1 disrupting DNA damage-induced apoptosis are associated with prostate cancer risk.
    Author: Wang X, Wang F, Taniguchi K, Seelan RS, Wang L, Zarfas KE, McDonnell SK, Qian C, Pan K, Lu Y, Shridhar V, Couch FJ, Tindall DJ, Beebe-Dimmer JL, Cooney KA, Isaacs WB, Jacobsen SJ, Schaid DJ, Thibodeau SN, Liu W.
    Journal: Cancer Res; 2006 Nov 01; 66(21):10302-7. PubMed ID: 17079449.
    Abstract:
    Germ line mutations in several genes (BRCA1, BRCA2, and CHEK2) whose products are involved in the DNA damage-signaling pathway have been implicated in prostate cancer risk. To identify additional genes in this pathway that might confer susceptibility to this cancer, we analyzed a recently identified DNA damage-response gene, p53AIP1 (a gene encoding for p53-regulated apoptosis-inducing protein 1), for genetic variants in prostate cancer. Five novel germ line variants were identified. The two truncating variants (Ser(32)Stop and Arg(21)insG) were found in 3% (4 of 132) of unselected prostate tumor samples. Genotyping of the two variants in an additional 393 men with sporadic prostate cancer showed a frequency of 3.1% (12 of 393) in contrast to 0.6% (2 of 327) in 327 unaffected men (Fisher's exact test, P = 0.018), with an odds ratio (OR) of 5.1 [95% confidence interval (95% CI), 1.1-23.0]. In addition, two of six tumors carrying the truncating variants were associated with loss of heterozygosity of the wild-type alleles, suggesting that p53AIP1 may act as a tumor suppressor. We also showed that the truncated p53AIP1 was unable to induce apoptosis and suppress cell growth in HeLa and COS-7 cells. These results suggest that loss-of-function variants in p53AIP1 associated with the risk of sporadic prostate cancer and further support the concept that the genetic defects in the DNA damage-response genes play an important role in the development of prostate cancer.
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