Biological clocks: Comparison of circadian rhythms between Drosophila and Musca
The article in G3: Genes, Genomes, Genetics focuses on the ability of circadian clock to adapt to various temperatures and describes conserved and unique features of circadian clock genes of two fly species and.
Figure: Musca (left) and Drosophila (right) display comparable bimodal activity patterns at hot temperatures (in red color), but differ in activity at cold temperatures (in blue).
Circadian clocks orchestrate daily activity patterns and free running periods of locomotor activity under constant conditions. While the first often depends on temperature, the latter is temperature-compensated over a physiologically relevant range. We explored the locomotor activity of the temperate housefly Musca domestica. Under low temperatures, activity was centered round a major and broad afternoon peak, while high temperatures resulted in activity throughout the photophase with a mild midday depression, which was especially pronounced in males exposed to long photoperiods. While period (per) mRNA peaked earlier under low temperatures, no temperature-dependent splicing of the last per 3' end intron was identified. The expression of timeless, vrille, and Par domain protein 1 was also influenced by temperature, each in a different manner. Our data indicated that comparable behavioral trends in daily activity distribution have evolved in Drosophila melanogaster and M. domestica, yet the behaviors of these two species are orchestrated by different molecular mechanisms.
Bazalová O., Doležel D. (2017) Daily Activity of the Housefly, Musca domestica, Is Influenced by Temperature Independent of 3' UTR period Gene Splicing G3: Genes, Genomes, Genetics 7: 1-13.