Social isolation upregulates takeout gene in female flies to drive increased sugar-seeking

Researchers led by Elisabeth A. Tawa, Lisa Schneper, Daniel A. Notterman, and colleagues have published in PLOS Genetics a study examining how social isolation changes gene expression and behaviour differently in male and female Drosophila melanogaster.

Adult flies were housed in isolation for seven days and then assessed for a range of behaviours and transcriptomic changes. The team found significant sex-based differences: isolated female flies showed increased preference for sucrose, while isolated males did not display the same effect to the same degree. Transcriptomic analysis identified elevated expression of the gene takeout in the brains of isolated females as a key driver of this heightened sucrose preference. takeout encodes a protein previously associated with feeding regulation and circadian timing in Drosophila.

The study adds to a body of research — much of it in invertebrate model systems — suggesting that social isolation induces brain states resembling starvation, and that these effects are not uniform across sexes. The authors used genetic tools to confirm the role of takeout specifically, moving beyond correlational transcriptomics to a mechanistic finding.

The research is a model-organism study; the authors draw no direct conclusions about human behaviour or clinical implications, though the findings contribute to the broader scientific literature on how social environment shapes gene expression in the nervous system.