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DNA polymerase theta is an enzyme that in humans is encoded by the POLQ gene. [ 5 ] [ 6 ] This polymerase plays a key role in one of the three major double strand break repair pathways: theta-mediated end joining (TMEJ).
[7] [8] NHEJ is the main pathway in higher eukaryotes for repair of DNA DSBs. Chromosomal DSBs are the most severe type of DNA damage. During NHEJ, duplexes generated by the alignment of broken DNA ends usually contain small gaps that need to be filled in by a DNA polymerase. DNA polymerase lambda can perform this function. [9]
Since DNA polymerase requires a free 3' OH group for initiation of synthesis, it can synthesize in only one direction by extending the 3' end of the preexisting nucleotide chain. Hence, DNA polymerase moves along the template strand in a 3'–5' direction, and the daughter strand is formed in a 5'–3' direction.
Eukaryotic Ku is a heterodimer consisting of Ku70 and Ku80, and forms a complex with DNA-PKcs, which is present in mammals but absent in yeast. Ku is a basket-shaped molecule that slides onto the DNA end and translocates inward. Ku may function as a docking site for other NHEJ proteins, and is known to interact with the DNA ligase IV complex ...
Microhomology-mediated end joining (MMEJ), also known as alternative nonhomologous end-joining (Alt-NHEJ) is one of the pathways for repairing double-strand breaks in DNA. As reviewed by McVey and Lee, [1] the foremost distinguishing property of MMEJ is the use of microhomologous sequences during the alignment of broken ends before joining, thereby resulting in deletions flanking the original ...
Pyrosequencing is a method of DNA sequencing (determining the order of nucleotides in DNA) based on the "sequencing by synthesis" principle, in which the sequencing is performed by detecting the nucleotide incorporated by a DNA polymerase. Pyrosequencing relies on light detection based on a chain reaction when pyrophosphate is released. Hence ...
5430 20020 Ensembl ENSG00000284832 ENSG00000181222 ENSMUSG00000005198 UniProt P24928 P08775 RefSeq (mRNA) NM_000937 NM_009089 NM_001291068 RefSeq (protein) NP_000928 NP_001277997 Location (UCSC) Chr 17: 7.48 – 7.51 Mb Chr 11: 69.62 – 69.65 Mb PubMed search Wikidata View/Edit Human View/Edit Mouse DNA-directed RNA polymerase II subunit RPB1, also known as RPB1, is an enzyme that is encoded ...
After cleavage of the 3' signaling region that directs the assembly of the complex, polyadenylate polymerase (PAP) adds the polyadenine tail to the new 3' end. The rate at which PAP adds adenine nucleotides is dependent on the presence of another regulatory protein, PABPII (poly-adenine binding protein II).