eLife digest Sleep affects memory: if you do not sleep well after a learning task, chances are
you will not be able to recall whatever you tried to learn earlier. This is seen in almost all animals
ranging from the fruit fly Drosophila, to mice and humans. However, the precise details of how
memory and sleep are connected remain unclear.
Drosophila is an excellent model for teasing out the connections between memory and sleep.
This is because its brain has a simple and well-studied memory region that contains a pair of nerve
cells called the dorsal paired medial neurons. These neurons enable memories to be stored for the
long term. Here, Haynes et al. asked whether these neurons can also affect sleep, and if so, how.
The experiments show that the dorsal paired medial neurons promote sleep in fruit flies. The
neurons release a signaling molecule called GABA, which is detected by a type of neighboring
‘mushroom body’ neuron that usually promotes wakefulness. This leads to increases in the levels of
chloride ions in the mushroom body neurons, but no change in the levels of calcium ions and a
molecule called cAMP, which indicates that GABA inhibits these cells. Flies that have lower levels of
two receptor proteins that detect GABA sleep less than normal flies.
Haynes et al.'s findings suggest that dorsal paired medial neurons deactivate their neighbors to
promote sleep in fruit flies. This result was unexpected because current models of memory
formation propose that dorsal paired medial neurons can activate the mushroom body neurons.
Understanding how inhibiting mushroom body neurons influences memory will require researchers
to reassess these models.