Increased expression of chloramphenicol acetyltransferase by carotenoid and retinoid replacement in drosophila opsin promoter fusion stocks

Dexue Sun, De Mao Chen, Allan Harrelson, William S. Stark

    Research output: Contribution to journalArticle

    19 Scopus citations

    Abstract

    Drosophila promoter fusion stocks containing a chloramphenicol acetyltransferase (CAT) reporter gene fused to a 2·8 kb DNA fragment from the Rh1 opsin promoter were carotenoid deprived from egg to adult, and then adults were replaced by feeding carrot juice. CAT activity, determined by radiometric assay, was low in deprived flies; it increased rapidly during the first 3 days of replacement and then declined back to the control level. Retinoic acid increased peak CAT activity as much as carrot juice and more than β-carotene, all-trans retinol or all-trans retinal. These findings suggest that vitamin A serves not only as rhodopsin's chromophore but also influences Rh1 opsin gene transcription. Three stocks with various deletions in the Rh1 opsin promoter lacked the carrot juice-dependent elevation of CAT activity. All three deletions include the region from -701 to -488, suggesting that this region may contain a vitamin A-responsive DNA sequence.

    Original languageEnglish (US)
    Pages (from-to)177-187
    Number of pages11
    JournalExperimental Eye Research
    Volume57
    Issue number2
    DOIs
    StatePublished - Aug 1993

    Keywords

    • Carotenoids
    • Drosophila
    • Promoter
    • Retinoic acid
    • Rhodopsin
    • Transcription
    • Vitamin A

    ASJC Scopus subject areas

    • Ophthalmology
    • Sensory Systems
    • Cellular and Molecular Neuroscience

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