DNA polymerase that promotes microhomology-mediated end-joining (MMEJ), an alternative non-homologous end-joining (NHEJ) machinery triggered in response to double-strand breaks in DNA. MMEJ is an error-prone repair pathway that produces deletions of sequences from the strand being repaired and promotes genomic rearrangements, such as telomere fusions (PubMed:24614976). Required to prevent extensive loss of sequences near G-quadruplex (G4) DNA sites, which are prone to cause genome alterations, by generating deletions (PubMed:24496117). a 2'-deoxyribonucleoside 5'-triphosphate + DNA(n) = diphosphate + DNA(n+1) Belongs to the DNA polymerase type-A family.