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Though smoking leads to an overall decrease in DNA methylation, several critical genes become hypermethylated. Two of the most noteworthy of these genes are p16 and p53. These genes are critical to cell cycle regulation and were shown to have higher levels of methylation in smokers than in non smokers. [3]
p53, also known as Tumor protein P53, cellular tumor antigen p53 (UniProt name), or transformation-related protein 53 (TRP53) is a regulatory protein that is often mutated in human cancers. The p53 proteins (originally thought to be, and often spoken of as, a single protein) are crucial in vertebrates, where they prevent cancer formation. [5]
Apoptosis-stimulating of p53 protein 2 (ASPP2) also known as Bcl2-binding protein (Bbp) and tumor suppressor p53-binding protein 2 (p53BP2) is a protein that in humans is encoded by the TP53BP2 gene. [ 5 ] [ 6 ] [ 7 ] Multiple transcript variants encoding different isoforms have been found for this gene.
Tumor suppressor p53-binding protein 1 also known as p53-binding protein 1 or 53BP1 is a protein that in humans is encoded by the TP53BP1 gene. [5] [6] [7]
The p53 p63 p73 family is a family of tumor suppressor genes. [1] [2] This gene family codes the proteins: p53; TP73L (also known as "p63") p73; They are sometimes considered part of a "p53 family." When overexpressed, these proteins are known to be involved in tumor pathogenesis. [3]
P53, a transcription factor, can bind two sites within the human TIGAR gene to activate expression. [9] [13] One site is found within the first intron, and binds p53 with high affinity. [9] [13] The second is found just prior to the first exon, binds p53 with low affinity, [9] [13] and is conserved between mice and humans. [9]
The previous finding of RTVP1 (GLIPR1) as a p53 target gene with tumor suppressor functions prompted the researches to initiate a genome-wide sequence homology search for RTVP1/GLIPR1-like (GLIPR1L) genes. [8] p53, the tumor suppressor gene is the most commonly mutated gene in human cancer. [8] Mutation in p53 gene can lead to cellular ...
This gene is a transcription factor that regulates the cell cycle and hence functions as a tumor suppressor. By inducing G ( guanine ) to T ( thymidine ) transversions in transversion hotspots within p53 , there is a probability that benzo[ a ]pyrene diol epoxide inactivates the tumor suppression ability in certain cells, leading to cancer.
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