p53 in dna damage response

Considering dna as a major target of radiation damage we hypothesized that tardigrade unique proteins associate with dna to protect and or to effectively repair dna in the tardigrade. This activation is marked by two major events. P53 becomes activated in response to myriad stressors including but not limited to dna damage induced by either uv ir or chemical agents such as hydrogen peroxide oxidative stress osmotic shock ribonucleotide depletion and deregulated oncogene expression.
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In this review we will focus on the multiple functions of p21 in cell cycle regulation apoptosis and gene transcription after dna damage and briefly discuss the pathways and factors that have critical roles in p21 expression and activity. Several h after uv exposure however and damage response signals abate epidermal keratinocytes proliferate robustly mediated by a variety of epidermal. P53 tp53 is a transcription factor whose protein levels and post translational modification state alter in response to cellular stress e g.

The differential use of p53 isoforms combined with the antagonism between apoptosis and autophagy ensures the generation of an appropriate p53 biological response to stress.

P53 in dna damage response. In addition p21 can play a role in dna repair by interacting with proliferating cell nuclear antigen pcna. Since reduced p53 expression leads to greater rns induced dna damage hpv infection acts as a dna damaging agent in the presence of rns stress. Hypoxia dna and spindle damage. P53 acts primarily at the g1 checkpoint controlling the g1.

In addition atm also turns on and stabilizes p53 via. Damage signals such as p53 activation profoundly alter keratinocyte physiology mediating cell cycle arrest activating dna repair and inducing apoptosis if the damage is sufficiently great. Activated atm is recruited to the dna damage sites for starting the dna damage response. This appeared to occur due to the ability of hpv to greatly reduce protein expression of the dna damage repair response gene p53 when infected cells were stressed by rns.

Using ipsc and cm extracts in western blots we found markedly reduced activation reflected in phosphorylation of several dna damage response components like p53 chk1 2 and γh2a x in mutant. Role of p53 isoforms in the dna damage response during drosophila oogenesis. Activation of p53 occurs by several mechanisms including phosphorylation by atm atr chk1 and mapks. Atm activates brca1 and atf2 to promote cascades of dna damage repair signaling path ways that involve hundreds of sensors transducers and effectors.

Ser1981 and ser2996 as well as acetylation on lys3016. When there is too much damage apoptosis is triggered in order to protect the organism from potentially harmful cells 7 p53 also known as a tumor suppressor gene is a major regulatory protein in the dna damage response system which binds directly to the promoters of its target genes.