Abstract
The human AE2 gene ( SLC4A2) is transcribed in a widespread fashion from the upstream promoter, the resultant full-length transcript AE2a being encountered in most tissues. Moreover, alternate promoter sequences within intron 2 may drive tissue-restricted expression of variants AE2b 1 and AE2b 2, mainly in liver and kidney. AE2b 2 proximal promoter sequences are highly active in transfected liver-derived HepG2 cells and contain an HNF1 motif. Mutation-disruption of this motif dramatically decreased alternate promoter activity in HepG2 cells but not in prostate-derived PC-3 cells. Electromobility shift and supershift assays indicated that HNF1α from HepG2 nuclear extracts binds the HNF1 sequence. Transactivation studies in PC-3 cells showed enhanced activity of the wild-type construct upon cotransfection with an HNF1α expression plasmid, while activity of the HNF1-mutated construct remained unaffected. Since liver AE2 is putatively involved in the biliary secretion of bicarbonate, HNF1α may have a role in increasing bicarbonate secretion in response to certain stimuli.
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