Catalytic component of the DNA polymerase epsilon complex (PubMed:10801849). Participates in chromosomal DNA replication (By similarity). Required during synthesis of the leading DNA strands at the replication fork, binds at/or near replication origins and moves along DNA with the replication fork (By similarity).

Has 3'-5' proofreading exonuclease activity that corrects errors arising during DNA replication (By similarity). Involved in DNA synthesis during DNA repair (PubMed:20227374, PubMed:27573199). Along with DNA polymerase POLD1 and DNA polymerase POLK, has a role in excision repair (NER) synthesis following UV irradiation (PubMed:20227374)

Component of the DNA polymerase epsilon complex consisting of four subunits: the catalytic subunit POLE and the accessory subunits POLE2, POLE3 and POLE4. Interacts with RAD17 and TOPBP1

The DNA polymerase activity domain resides in the N-terminal half of the protein, while the C-terminus is necessary for maintenance of the complex

The CysA-type zinc finger is required for PCNA-binding

The CysB motif binds 1 4Fe-4S cluster and is required for the formation of polymerase complexes

• Colorectal cancer 12 (CRCS12)

  A complex disease characterized by malignant lesions arising from the inner wall of the large intestine (the colon) and the rectum. Genetic alterations are often associated with progression from premalignant lesion (adenoma) to invasive adenocarcinoma. Risk factors for cancer of the colon and rectum include colon polyps, long-standing ulcerative colitis, and genetic family history.

  CRCS12 is characterized by a high-penetrance predisposition to the development of colorectal adenomas and carcinomas, with a variable tendency to develop multiple and large tumors. Onset is usually before age 40 years. The histologic features of the tumors are unremarkable.

• Facial dysmorphism, immunodeficiency, livedo, and short stature (FILS)

  A syndrome characterized by mild facial dysmorphism, mainly malar hypoplasia, livedo on the skin since birth, and immunodeficiency resulting in recurrent infections. Growth impairment is observed during early childhood and results in variable short stature in adulthood.

• Intrauterine growth retardation, metaphyseal dysplasia, adrenal hypoplasia congenita, genital anomalies, and immunodeficiency (IMAGEI)

  An autosomal recessive disorder characterized by intrauterine growth retardation, postnatal growth failure, metaphyseal dysplasia, adrenal hypoplasia congenita, growth hormone deficiency, genital anomalies, and immunodeficiency resulting in increased infections.