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    Nat Genet. 2007 Feb;39(2):264-8. Epub 2007 Jan 21.

    Quantitative trait transcripts for nicotine resistance in Drosophila melanogaster.

    Passador-Gurgel G, Hsieh WP, Hunt P, Deighton N, Gibson G.

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    Department of Genetics, North Carolina State University, Raleigh, North Carolina 27695, USA.

    Abstract

    Although most genetic association studies are performed with the intention of detecting nucleotide polymorphisms that are correlated with a complex trait, transcript abundance should also be expected to associate with diseases or phenotypes. We performed a scan for such quantitative trait transcripts in adult female heads of the fruit fly (Drosophila melanogaster) that might explain variation for nicotine resistance. The strongest association was seen for abundance of ornithine aminotransferase transcripts, implicating detoxification and neurotransmitter biosynthesis as mediators of the quantitative response to the drug. Subsequently, genetic analysis and metabolite profiling confirmed a complex role for ornithine and GABA levels in modification of survival time upon chronic nicotine exposure. Differences between populations from North Carolina and California suggest that the resistance mechanism may be an evolved response to environmental exposure.

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    PMID:
    17237783
    [PubMed - indexed for MEDLINE]

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