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Quantitative trait transcripts for nicotine resistance in Drosophila melanogaster
Gisele Passador-Gurgel1, Wen-Ping Hsieh, Priscilla Hunt
1Department of Genetics, North Carolina State University, Raleigh, North Carolina 27695, USA.
Nature Genetics
|January 24, 2007
Summary
Fruit fly transcript abundance, specifically ornithine aminotransferase, is linked to nicotine resistance. This suggests detoxification and neurotransmitter pathways mediate the response, potentially an evolved trait.
Area of Science:
- Genetics
- Toxicology
- Neurobiology
Background:
- Genetic association studies typically focus on nucleotide polymorphisms.
- Transcript abundance is also a relevant factor for complex traits and phenotypes.
- Quantitative trait transcripts (QTTs) offer a complementary approach to understanding genetic influences.
Purpose of the Study:
- To identify quantitative trait transcripts associated with nicotine resistance in Drosophila melanogaster.
- To investigate the role of specific gene expression levels in mediating responses to nicotine exposure.
- To explore potential environmental influences on nicotine resistance mechanisms.
Main Methods:
- Performed a scan for quantitative trait transcripts in adult female fruit fly heads.
- Analyzed the abundance of ornithine aminotransferase transcripts.
- Conducted genetic analysis and metabolite profiling for ornithine and GABA levels.
- Compared nicotine resistance between fruit fly populations from different geographic locations.
Main Results:
- The strongest association was found for the abundance of ornithine aminotransferase transcripts.
- This implicates detoxification and neurotransmitter biosynthesis pathways in nicotine response.
- Ornithine and GABA levels were confirmed to play a complex role in survival time during chronic nicotine exposure.
- Differences between North Carolina and California populations suggest an evolved environmental response.
Conclusions:
- Ornithine aminotransferase transcript abundance is a significant factor in nicotine resistance in fruit flies.
- Detoxification and neurotransmitter biosynthesis are key mechanisms mediating nicotine response.
- Nicotine resistance may be an evolved trait influenced by environmental factors, as suggested by population differences.
