p53 pathway gene single nucleotide polymorphisms and chronic lymphocytic leukemia

The p53 pathway plays a critical role in chronic lymphocytic leukemia (CLL). The association between the single-nucleotide polymorphism (SNP) within the p53 gene (R72P) and its downstream target/regulators, BAX (G125A) and MDM2 (SNP309), and clinical parameters/prognostic markers was investigated in 83 CLL patients. Although the p53 R72P SNP and MDM2 SNP309 did not associate with any of the parameters studied, the BAX G125A SNP was associated with a more advanced Binet stage at diagnosis, supporting a potential role for this variant in CLL disease progression. In reporter assays, however, the BAX 5′ untranslated region G125A SNP surprisingly caused a 1.8-fold increase in basal promoter activity and did not alter the ability of p53 to trans-activate the promoter. Further studies are required to understand the role of SNS in the p53 pathway in CLL.