We have isolated and sequenced the promoter region of the mouse gene (
mOAT) encoding ornithine aminotransferase. A comparison of these mOAT
sequences with previously reported sequences for the rat and human gen
es encoding .OAT, rOAT and hOAT, respectively, revealed a 256-bp regio
n flanking the transcription start point that is highly conserved betw
een the three genes. This region contains sequence motifs resembling b
inding sites for general transcription factors, as well as other trait
s-acting regulatory proteins.