Comparative analysis of the brain transcriptome in a hyper-aggressive fruit fly, Drosophila prolongata

Area of Science:

• Evolutionary biology
• Neurogenetics
• Animal behavior

Background:

• Aggressive behavior varies significantly across animal species.
• The genetic underpinnings of aggression have been explored in Drosophila melanogaster, focusing on intra-species variation.
• The role of genes in the evolution of aggression between species remains largely unexamined.

Purpose of the Study:

• To identify genes associated with the evolution of aggressiveness in Drosophila prolongata by analyzing brain transcriptomes.
• To compare these genes with those known to influence aggression within Drosophila melanogaster.

Main Methods:

• Performed de novo transcriptome analysis on the brains of male Drosophila prolongata.
• Compared gene expression profiles to identify differentially expressed genes.
• Contrasted identified genes with previously documented aggression-related genes in Drosophila melanogaster.

Main Results:

• Identified 21 differentially expressed genes in the brains of male Drosophila prolongata.
• The identified genes did not overlap with aggression-related genes found in Drosophila melanogaster.
• Expression levels of the 21 identified genes showed greater similarity between sexes within D. prolongata than between D. prolongata and related species.

Conclusions:

• Genes involved in the evolution of inter-species aggressiveness are distinct from those regulating intra-species variation in Drosophila.
• The identified genes may play a conserved role in aggression across sexes within Drosophila prolongata, despite behavioral differences.