1)List the two mechanisms of DNA repair that involve double strand breaks

1)List the two mechanisms of DNA repair that involve double strand breaks. Explain key differences between the two mechanisms. For each, give the name of a protein that is an important sensor for detecting the break.
2)List the three mechanisms of DNA repair (not simple proofreading nor direct repair) that do not involve double strand breaks. Explain the specialty of each mechanism and the consequences of their failure. For each, give an enzyme that is specific to each mechanism and explain its specific function.