| Modification Notes |
DNA replication, recombination and repair, all of which are necessary for genomic stability, require the presence of exonucleases. In DNA replication, these enzymes are involved in the processing of Okazaki fragments, whereas in DNA repair, they function to excise damaged DNA fragments and correct recombinational mismatches. These exonucleases include the family of DNA polymerases. TRF4 (topoisomerase-related function protein 4-1), also known as POLS (polymerase sigma), POLK (polymerase ˚) or LAK-1, is a member of the Y-family of translesion DNA polymerases and is involved in DNA replication and repair. In addition, TRF4 may be involved in the cohesion of sister chromatids in association with the replicaton fork. Once replicated, sister chromatids must be held together until anaphase to ensure accurate chromosome segregation. |