MaggotTracker

MaggotTracker performs automated, high-resolution single-animal tracking and quantitative analysis of Drosophila larval locomotion to characterize locomotor phenotypes.

Key Features:

• Automated Tracking: Uses a motorized microscope stage to maintain the subject within the viewing center during video capture for consistent single-animal tracking.
• Midline Representation: Reduces each larva into 13 evenly distributed points along its midline to represent body shape.
• Behavioral Parameter Quantification: Computes over 20 behavioral parameters from video-derived midline data.
• Locomotion Metrics Evaluated: Evaluates shape, peristalsis movement, stamina, and the track of the animal.
• Fixed-Duration Recording: Tracks each larva for four minutes during analysis.

Scientific Applications:

• Correlation Analysis: Identified correlations between distance traveled and striding speed and relationships among striding speed, stride distance, and stride duration.
• Sexual Dimorphism Studies: Observed sexual dimorphism in body length while locomotive parameters such as speed showed no significant sex differences.
• Developmental and Substrate Effects: Demonstrated that locomotive parameters are influenced by developmental stage and the surface on which larvae crawl.
• Genetic Mutant Analysis — Circadian Genes: Reported no significant changes in movement speed for period (per), timeout, and timeless (tim) mutants.
• Genetic Mutant Analysis — Neuromuscular Junction Genes: Detected significant alterations in multiple locomotive parameters for ether a go-go (eag), Shaker (Sh), slowpoke (slo), and dunce (dnc) mutants consistent with neuromuscular functions.
• K+ Channel Phenotypic Similarity: Found highly similar phenotypic patterns among the K+ channel genes eag, Sh, and slo.

Methodology:

Video capture with a motorized microscope stage to keep the larva centered; representation of each larva as 13 evenly distributed midline points; computation of over 20 locomotion-related parameters from four-minute recordings.