ku70 dna damage sensing

Zak a kinase in this pathway can be specifically inhibited to ameliorate aging related autoimmunity. Cyclin dependent kinase inhibitors cip kip shown in purple block cell cycle progession in all phases of the cell cycle g1 s g2 or m following dna damage by inhibiting cyclin dependent kinase complexes shown in green. Now show that in aging cd4 t cells ku complex senses cytoplasmic dna promoting t cell activation and proliferation.
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Indeed dna pkcs phosphorylation by itself and by the multifunctional dna damage response ddr kinase atm is an important regulator of cnhej affecting both ku70 ku80 binding and its. P53 is a dna damage response protein that triggers dna damage repair after activation ou and schumacher 2018 consistent with the observed increase in mild dna damage p53 was hyperactivated in aged cd4 t cells figure 1k. Dna pk can be removed by phosphorylation of ku70 to reduce its dna binding affinity degradation of ku through ubiquitination or mrn mediated dna cleavage.

Dna repair is a collection of processes by which a cell identifies and corrects damage to the dna molecules that encode its genome.

Ku70 dna damage sensing. The former constitutes the predominant dna repair pathway in humans and involves dna repair proteins such as dna pk ku70 and ku80 181 182. The encoded protein is a pattern recognition receptor that detects cytosolic nucleic acids and transmits signals that activate type i interferon responses. Human studies of cancers associated with carcinogen induced dna damage. Carcinogen dna damage formed post combustion of tobacco implicated in the aetiology of lung cancer is a prime example.

The encoded protein has also been shown to play a role in apoptotic signaling by associating. Base damage can be repaired either by enzyme catalyzed reversal or alternatively via excision repair 183. There are many human studies implicating environmental and or dietary associated carcinogen exposures in the aetiology of cancer. Many of these lesions cause structural damage to the dna molecule.

In mammalian cells the damage sensing mrn complex mre11 rad50 nbs1 together with its interacting partner ctip c terminal binding protein interacting protein. Nad one of the most common metabolites in the human body is in a homeostatic status of biosynthesis consumption recycling and degradation at both cellular and systemic levels. Accordingly p53 deficiency led to increased detectable trace γh2ax levels and thus promoted the cytoplasmic accumulation of dsdna in cd4 t cells figures 1l 1q. Cell cycle checkpoints are induced by dna damage shown in red.

Figure 12 12 cell fates following dna damage. The ku complex is typically associated with dna damage repair in the nucleus. In human cells both normal metabolic activities and environmental factors such as radiation can cause dna damage resulting in tens of thousands of individual molecular lesions per cell per day. This gene encodes a five transmembrane protein that functions as a major regulator of the innate immune response to viral and bacterial infections.