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This then allows recruitment of the DNA repair enzyme MRE11, to initiate DNA repair, within 13 seconds. [51] γH2AX, the phosphorylated form of H2AX is also involved in the early steps leading to chromatin decondensation after DNA double-strand breaks. The histone variant H2AX constitutes about 10% of the H2A histones in human chromatin.
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Individuals with an inherited impairment in DNA repair capability are often at increased risk of cancer. [45] When a mutation is present in a DNA repair gene, the repair gene will either not be expressed or be expressed in an altered form. Then the repair function will likely be deficient, and, as a consequence, damages will tend to accumulate.
OGG1 is the primary enzyme responsible for the excision of 8-oxoguanine (8-oxoG), a mutagenic base byproduct that occurs as a result of exposure to reactive oxygen species (ROS). OGG1 is a bifunctional glycosylase, as it is able to both cleave the glycosidic bond of the mutagenic lesion and cause a strand break in the DNA backbone.
DNA glycosylases are a family of enzymes involved in base excision repair, classified under EC number EC 3.2.2. Base excision repair is the mechanism by which damaged bases in DNA are removed and replaced.
FEN1 is over-expressed in the majority of cancers of the breast, [17] prostate, [18] stomach, [19] [20] neuroblastomas, [21] pancreatic, [22] and lung. [23]FEN1 is an essential enzyme in an inaccurate pathway for repair of double-strand breaks in DNA called microhomology-dependent alternative end joining or microhomology-mediated end joining (MMEJ). [24]
Base excision repair (BER) is a cellular mechanism, studied in the fields of biochemistry and genetics, that repairs damaged DNA throughout the cell cycle. It is responsible primarily for removing small, non-helix-distorting base lesions from the genome.
In this case, the term PRR would encompasses all processes that facilitate the replication of damaged DNA, including those that repair replication-induced double-strand breaks. Melanoma cells are commonly defective in postreplication repair of DNA damages that are in the form of cyclobutane pyrimidine dimers , a type of damage caused by ...
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