Abstract
p16 (MTS 1) and p15 (MTS 2) are negative regulators of cell cycle progression at the G1 cell cycle checkpoint and function as tumor suppressor genes (TSG). Both p15 and p16 are located on chromosome 9p21 and alterations have been demonstrated in a variety of human malignancies and human cancer cell lines. In testicular germ cell tumors (TGCT) loss of heterozygosity of 9p21 to 23 has been observed in 41% to 72% of informative cases. The aim of our study was to examine TGCT and testicular cancer cell lines for deletions and mutations of the p15 and p16 genes. 24 testicular germ cell tumors, 4 testicular cancer cell lines (TERA I, TERA II, HTE, HTH), 8 benign testicular tumors and 9 samples of normal testicular parenchyma were examined. Examinations for loss of heterozygosity (LOH) on 9p21 were performed for IFNA, D9S171, D9S126, D9S161, D9S1748 and PKY9 locus using Southern Blot analysis. Southern Blot analysis of the p16 gene to examine gross alterations was done using random primer labeled p16 cDNA. In addition all samples were examined for mutations of exons 1 to 3 of p16 and exons 1 to 2 of p15 by polymerase chain reaction (PCR) followed by single strand conformation polymorphism (SSCP) analysis on MDE-gels. All observed band...Continue Reading
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