Brief disruption of activity in a subset of dopaminergic neurons during consolidation impairs long-term memory by fragmenting sleep.

Disrupting activity in a specific subset of dopaminergic neurons during memory consolidation impairs long-term memory by causing sleep fragmentation in Drosophila melanogaster.

• Why it matters: Sleep disturbances are linked to poor long-term memory formation, but the neural circuits and cell types involved remain unclear, hindering targeted interventions.
• What they did: The study used brief activation or inhibition of two dorsal posterior medial dopamine neurons (DPM) in male and female flies during early consolidation, revealing that sleep loss and fragmentation impair 24-hour LTM, which can be rescued pharmacologically.
• The result: A microcircuit involving PAM-α1 dopamine neurons, DPM neurons, and MBON-α1 mediates sleep-memory interactions, with the PAM-α1 to DPM pathway playing a key role in maintaining sleep for effective memory consolidation.