Abstract
Oct-1 is a sequence-specific transcription and DNA replication factor that recognizes the octameric sequence ATGCAAAT. This protein shares an extended region of sequence similarity, called the POU domain, with the lymphoid-specific transcription factor Oct-2, the pituitary-specific transcription factor Pit-1, and the Caenorhabditis elegans cell lineage gene product unc-86. Two subdomains, POU-related homeobox and POU-specific box, lie within the POU domain. Unlike other POU or homeodomain proteins. Oct-1 is ubiquitously expressed. A ubiquitous 95- to 100-kDa protein that has the same DNA-binding properties and is variously referred to as OTF-1, NFIII, or OBP100 is probably identical to Oct-1. The human gene was mapped by Southern blot analyses of human × rodent hybrid cell lines to chromosome 1, region cen-q32. In Chinese hamster × mouse hybrid cell lines the mouse locus was also mapped to chromosome 1. With the BXD (from progenitor strains C57BL 6J and DBA 2J ) set of recombinant inbred strains of mice, the murine gene was localized on the linkage map of mouse chromosome 1. There were no recombinants among 26 strains with Ly-22 and 1 recombinant among 24 strains with Ltw-4. The gene symbol is OTF1 for humans and Oct-1 for mouse.
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