Foraging behaviour in Drosophila larvae: mushroom body ablation

Area of Science:

• Behavioral genetics
• Neuroethology
• Animal behavior

Background:

• Drosophila melanogaster larvae exhibit a natural polymorphism in locomotor activity during foraging, categorized as 'rover' and 'sitter' morphs.
• This behavioral variation is linked to the foraging (for) gene, which encodes cGMP-dependent protein kinase (PGK).
• Rover larvae show higher PGK expression and activity, correlating with longer foraging trails compared to sitters.

Purpose of the Study:

• To investigate the role of the foraging gene and associated PGK in mediating behavioral differences in Drosophila larvae.
• To determine the involvement of mushroom bodies (MBs) in the expression of the foraging behavioral polymorphism using structure-function analysis.

Main Methods:

• Genetic analysis of the foraging (for) gene and its role in cGMP-dependent protein kinase (PGK) expression.
• Pharmacological ablation of mushroom bodies (MBs) in newly hatched larvae using hydroxyurea.
• Comparative analysis of locomotor activity and foraging trail patterns in rover and sitter morphs before and after MB ablation.

Main Results:

• Locomotor activity levels during foraging in both rover and sitter larval morphs were not significantly affected by mushroom body ablation.
• The foraging (for) gene and its encoded PGK are crucial for the observed behavioral polymorphism.
• Mushroom bodies do not appear to be the primary mediators of this specific foraging behavioral polymorphism in Drosophila larvae.

Conclusions:

• The foraging gene and PGK levels are key determinants of the rover/sitter behavioral polymorphism in Drosophila larvae.
• Mushroom bodies are not essential for mediating the locomotor activity differences between rover and sitter morphs.
• Further research is needed to explore alternative neural circuits or mechanisms underlying this behavioral variation.