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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Isolation and characterization of the human cyclin T1 promoter.

Cyclin T1 (CycT1) is a regulatory subunit of a general RNA polymerase II (RNAP II) elongation factor termed P-TEFb. The human immunodeficiency virus Tat protein directly associates with CycT1 to utilize CycT1/P-TEFb (also called TAK) for activation of RNAP II elongation of the integrated proviral genome. CycT1 mRNA and protein levels are induced in activated human peripheral blood lymphocytes and CycT1 protein levels are induced by a post-transcriptional mechanism when human U937 promonocytic cells are stimulated to differentiate into macrophage-like cells. To investigate mechanisms that regulate CycT1 RNA expression, we isolated the CycT1 promoter. Multiple transcription start sites were identified within 330 nucleotides upstream of the ATG initiation codon at +1. The CycT1 promoter lacks a TATA element and possesses high constitutive activity in plasmid transfection assays. Two distinct regions of the promoter were identified upstream of +1 that contain critical regulatory elements for CycT1 promoter function.[1]


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