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Expression of the mouse hypoxanthine phosphoribosyltransferase gene deletional analysis of the promoter region of an x chromosome linked housekeeping gene

, : Expression of the mouse hypoxanthine phosphoribosyltransferase gene deletional analysis of the promoter region of an x chromosome linked housekeeping gene. Cell 44(2): 319-328

The mouse hypoxanthine phosphoribosyltransferase gene, like several other housekeeping genes, lacks many of the features associated with promoters of RNA polymerase II-transcribed genes. HPRT transcripts have multiple initiation sites and an HPRT minigene was used to show that only 49 bases of 5' flanking sequence was necessary for normal expression in cultured cells. The essential region, which occurs within a complex series of direct repeats is homologous to sequences upstream of other housekeeping genes. When this sequence was deleted, cryptic upstream initiation sites were revealed. Similar aberrant patterns of initiation were seen with all minigenes assayed in Xenopus oocytes. We speculate that this region of the HPRT promoter is involved in a different interaction with the transcriptional machinery to that occurring at more conventional promoters.

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