Elongator complex is required for long-term olfactory memory formation in Drosophila

Area of Science:

• Neuroscience
• Molecular Biology
• Genetics

Background:

• The Elongator Complex is vital for transcriptional elongation.
• Elp3, a catalytic subunit, has histone acetyltransferase activity and is linked to human neurodegeneration.
• Elp1, a scaffolding subunit, is associated with familial dysautonomia when mutated.

Purpose of the Study:

• To investigate the role of Elongator Complex subunits, Elp1 and Elp3, in Drosophila long-term olfactory memory formation.
• To determine if Elp1 and Elp3 are necessary for the neural traces underlying long-term memory.

Main Methods:

• RNAi-mediated knockdown of Elp3 and Elp1 in adult Drosophila mushroom bodies.
• Assessment of long-term memory (LTM) and earlier memory forms.
• Analysis of calcium influx in mushroom body neurons to identify memory traces.
• Rescue experiments using cDNA coexpression.

Main Results:

• Knockdown of Elp3 or Elp1 in mushroom bodies specifically impaired LTM, not earlier memory stages.
• The LTM deficits were associated with the abolishment of a memory trace, indicated by altered calcium influx.
• Coexpression of Elp3 or Elp1 cDNA rescued both the LTM impairment and the memory trace defect.

Conclusions:

• The Elongator Complex is essential for long-term olfactory memory in adult Drosophila.
• Elp1 and Elp3 function within mushroom body neurons to establish and maintain long-term memory and its associated neural trace.