Miller, C.J., Carlson, J.R. (2010). Regulation of Odor Receptor Genes in Trichoid Sensilla of the Drosophila Antenna. Genetics 186(1): 79--95.
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This study concerns the problem of odor receptor gene choice in the fruit fly Drosophila melanogaster. From a family of 60
Odor receptor genes, only one or a small number are selected for expression by each olfactory receptor neuron. Little is known
about how an olfactory receptor neuron selects a receptor, or how the nucleotide sequences flanking a receptor gene dictate
its expression in a particular neuron. Previous investigation has primarily concerned the maxillary palp, the simpler of the
fly's two olfactory organs. Here we focus on genes encoding four antennal receptors that respond to fly odors in an in vivo
expression system. To investigate the logic of odor receptor expression, we carry out a genetic analysis of their upstream
regulatory sequences. Deletion analysis reveals that relatively short regulatory regions are sufficient to confer expression
in the appropriate neurons, with limited if any misexpression. We find evidence for both positive and negative regulation.
Multiple repressive functions restrict expression to the antenna, to a region of the antenna, and to neurons. Through deletion
and base substitution mutagenesis we identify GCAATTA elements and find evidence that they act in both positive and negative
regulation.
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