MicroRNAs Regulate Multiple Aspects of Locomotor Behavior inDrosophila

Abstract

Locomotion is an ancient and fundamental output of the nervous system required for animals to perform many other complex behaviors. Although the formation of motor circuits is known to be under developmental control of transcriptional mechanisms that define the fates and connectivity of the many neurons, glia and muscle constituents of these circuits, relatively little is known about the role of post-transcriptional regulation of locomotor behavior. MicroRNAs have emerged as a potentially rich source of modulators for neural development and function. In order to define the microRNAs required for normal locomotion in Drosophila melanogaster, we utilized a set of transgenic Gal4-dependent competitive inhibitors (microRNA sponges, or miR-SPs) to functionally assess ca. 140 high-confidence Drosophila microRNAs using automated quantitative movement tracking systems followed by multiparametric analysis. Using ubiquitous expression of miR-SP constructs, we identified a large number of microRNAs that modulate aspects of normal baseline adult locomotion. Addition of temperature-dependent Gal80 to identify microRNAs that act during adulthood revealed that the majority of these microRNAs play developmental roles. Comparison of ubiquitous and neural-specific miR-SP expression suggests that most of these microRNAs function within the nervous system. Parallel analyses of spontaneous locomotion in adults and in larvae also reveal that very few of the microRNAs required in the adult overlap with those that control the behavior of larval motor circuits. These screens suggest that a rich regulatory landscape underlies the formation and function of motor circuits and that many of these mechanisms are stage and/or parameter-specific.

MicroRNA-Dependent Control of Sensory Neuron Function Regulates Posture Behavior in Drosophila

“…Previous work showed that miR-263b plays an important role in the Drosophila peripheral nervous system, where it forms part of a gene regulatory pathway that represses apoptosis during sense organ development (Hilgers, et al 2010); other studies report that downregulation or mutation of miR-263b lead to distortions of adult locomotion patterns (Donelson, et al, 2020) or affects stereotypical parameters of male-female courtship (Iftikhar et al, 2019), respectively.…”