The <i>Drosophila</i> Receptor Tyrosine Kinase Alk Constrains Long-Term Memory Formation

Abstract

In addition to mechanisms promoting protein-synthesis-dependent long-term memory (PSD-LTM), the process appears to also be specifically constrained. We present evidence that the highly conserved receptor tyrosine kinase dAlk is a novel PSD-LTM attenuator in Drosophila. Reduction of dAlk levels in adult / mushroom body (MB) neurons during conditioning elevates LTM, whereas its overexpression impairs it. Unlike other memory suppressor proteins and miRNAs, dAlk within the MBs constrains PSD-LTM specifically but constrains learning outside the MBs as previously shown. Dendritic dAlk levels rise rapidly in MB neurons upon conditioning, a process apparently controlled by the 3UTR of its mRNA, and interruption of the 3UTR leads to enhanced LTM. Because its activating ligand Jeb is dispensable for LTM attenuation, we propose that postconditioning elevation of dAlk within / dendrites results in its autoactivation and constrains formation of the energy costly PSD-LTM, acting as a novel memory filter.