Abstract
Chemosensory systems mediate some of the most vital animal behaviors. However, our knowledge of the genetic mechanisms that underlie behavioral responses to olfactory cues remains fragmented. Genome-wide association mapping has greatly advanced our ability to identify candidate loci associated with variation in olfactory behavior, but functional validation of these candidates remain a necessary next step in understanding the mechanisms by which these genes influence chemoreception. In previous genome-wide association analyses, a genomic region that spans multiple polymorphic loci on the left arm of the third chromosome was found to be significantly associated with variation in olfactory behavioral responses to the odorant 2,3-butanedione, a volatile compound present in fermenting fruit. In this study, behavioral analysis of flies possessing either the major or minor haplotype for this region confirmed the association between polymorphisms in the region and variation in olfactory behavior. Moreover, functional dissection of the genes within this region using P-element insertional mutagenesis together with targeted RNAi experiments revealed that the gene CG6767, a gene of previously unknown function but predicted to encode an enzyme responsible for the synthesis and metabolism of nucleic acids, affects olfactory behavioral responses to 2,3-butanedione. Specifically, RNAi mediated knockdown of CG6767 expression in different neuroanatomical populations of the olfactory system suggests that this gene functions in local interneurons of the antennal lobe. These results reveal a new role for CG6767 and its importance in olfactory behavior.
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Acknowledgements
We would like to thank John Layne for helpful discussions and critical feedback on the manuscript. We also thank members of the Rollmann lab for technical assistance and/or helpful discussions. We wish to acknowledge TRiP at the Harvard Medical School (NIH/NIGMS R01-GM084947) for providing transgenic RNAi stocks. This work was supported by the National Institutes of Health [Grant No. GM080592 to S.M.R.], the National Science Foundation Research Experiences for Undergraduates [Grant No. DBI-1262863, E.R.], and the University of Cincinnati Graduate School Dean’s Fellowship [E.B.].
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Brown, E., Rayens, E. & Rollmann, S.M. The Gene CG6767 Affects Olfactory Behavior in Drosophila melanogaster. Behav Genet 49, 317–326 (2019). https://doi.org/10.1007/s10519-019-09949-8
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DOI: https://doi.org/10.1007/s10519-019-09949-8