Cloning and chromosomal mapping of the human DNA polymerase theta (POLQ), the eighth human DNA polymerase.


We have cloned the cDNA for the eighth human DNA polymerase, DNA ...
We have cloned the cDNA for the eighth human DNA polymerase, DNA polymerase θ. The human cDNA encodes a putative DNA polymerase of 1762 amino acids with a calculated molecular mass of 198 kDa. The derived protein sequence is homologous to the Drosophila melanogaster mus308 protein product, a putative DNA polymerase-helicase involved in repair of interstrand crosslinks. The C-terminal region contains the canonical DNA polymerase motifs A, B, and C found in the family A type of DNA polymerases, which includes Escherichia coli polymerase I. The N-terminal region contains a putative ATP binding domain but not motifs for a helicase. The gene was mapped by radiation hybrid analysis to chromosome 3q within an interval flanked by proximal marker D3S1303 and distal marker D3S3576 and, based on proximity to a gene that has been mapped cytogenetically, within band 3q13.31.




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