Oxytocin receptor or vasopressin 1a receptor knockout suppresses same-sex conspecific aggression without affecting partner preference in male prairie voles (Microtus ochrogaster).
Level 5 - mechanism / opinion, no new human data
Non-human animal experimental study.
PubMed 42413323 · doi:10.1016/j.yhbeh.2026.105968
What was done
CRISPR/Cas9 genome editing was used to generate vasopressin 1a receptor knockout (V1aR KO) male prairie voles, with functional receptor loss verified via in vitro receptor assays and autoradiography. Following pair-bond formation, aggression toward a male stranger, female stranger, and female partner was evaluated and compared among V1aR KO, oxytocin receptor knockout (OXTR KO), and wild-type (WT) males alongside tests for partner preference and social investigation.
What was found
The abstract reports no numerical values, counts, or statistical metrics. Qualitatively, WT males displayed selective aggression toward male strangers (prolonged bouts, frequent biting) and minimal aggression toward female partners. Both V1aR KO and OXTR KO males showed a marked reduction in aggression toward male strangers. Partner preference and social investigation remained intact in both knockout lines.
Why it matters
This work provides genetic evidence that V1aR and OXTR signaling mediate selective aggression toward same-sex intruders in pair-bonded male prairie voles, demonstrating that this post-bonding aggression can be dissociated from pair-bond maintenance.
Limits
The abstract reports no sample sizes (n is unknown), variance, or quantitative measurements. Findings are limited to male prairie voles and preclinical animal behavior paradigms, with uncertain applicability to other species.
Cited by
- contradicts Genetically modifying prairie voles to make their vasopressin receptors non-responsive causes them to switch from monogamous to polygamous behavior.