Cloning and functional analysis of the mouse 5-lipoxygenase promoter

American Journal of Respiratory Cell and Molecular Biology
Eric S SilvermanWeining Lu

Abstract

5-lipoxygenase (ALOX5), an enzyme essential for the formation of all leukotrienes, is highly regulated at multiple levels, including gene transcription. The human ALOX5 promoter sequence has been cloned and is well characterized. Several important cis-acting elements have been identified including a G+C-rich sequence approximately 145-179 base pairs (bp) upstream from the ATG start codon. This region contains consensus-binding sites for the transcription factor serum protein 1, a zinc-finger transcription factor (SP1) and early growth-response protein 1, a zinc-finger transcription factor (EGR-1) and is unique in that functionally significant polymorphisms alter these sequences. To further understand the significance of these polymorphisms and other regulatory sequences in the promoter we cloned approximately 2,000 bp of the mouse promoter sequence from a 129/SvJ BAC library for direct comparison with the human gene. Like the human promoter, the mouse Alox5 promoter lacks a TATA box and has multiple start sites. The first 292 bp immediately upstream of the translational start site function as a core promoter that is capable of mediating high basal transcription in RAW cells but not 3T3 cells. There are vast differences in the d...Continue Reading

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