Naked Mole-Rat Queens Suppress Reproduction With 1 Odour Compound, Blocking 5 of 6 Pregnancies
Updated
Updated · Nature.com · Jul 15
Naked Mole-Rat Queens Suppress Reproduction With 1 Odour Compound, Blocking 5 of 6 Pregnancies
1 articles · Updated · Nature.com · Jul 15
Summary
Researchers identified isopropyl myristate, or IPM, as a queen-enriched scent in naked mole-rats that suppresses reproduction in non-breeders and helps keep colonies socially stable.
771 samples from 351 animals showed IPM was abundant in queens, nearly absent in non-breeders, peaked around ovulation, and activated olfactory neurons and brain circuits tied to smell and behavior.
In isolated opposite-sex pairs, daily IPM exposure prevented pregnancies in 0 of 7 pairs, while 5 of 6 control pairs conceived; colony bedding also blocked pregnancies, suggesting queen-linked odours can maintain infertility.
In a queenless colony, 12 weeks of daily IPM kept prolactin high, progesterone low and aggression absent; after withdrawal, fighting began within a week, one female was killed, and another became the new breeding queen.
The findings offer rare evidence of a mammalian chemical cue acting like an insect queen pheromone, linking smell to hormone-driven reproductive hierarchy in a eusocial species.
A chemical in cosmetics controls mole-rat society. Should we re-evaluate the biological effects of common industrial ingredients?
If one molecule can build a stable society, could this discovery lead to new forms of social or reproductive control?
How did nature turn a simple chemical, also found in coconuts, into a 'social hormone' that prevents civil war?
The Chemical Key to Mammalian Eusociality: How Isopropyl Myristate Orchestrates Reproductive Suppression in Naked Mole-Rats (2026 Breakthrough)
Overview
In July 2026, scientists made a groundbreaking discovery by identifying isopropyl myristate (IPM) as the chemical key behind the eusocial structure of naked mole-rat colonies. Years of research revealed that the queen produces IPM, which acts as a scent signal to suppress reproduction in other colony members and maintain social order. This is the first time such a chemical has been definitively linked to social control in a mammal. The finding builds on earlier work showing naked mole-rats have a sophisticated sense of smell, highlighting how a single compound can orchestrate complex social behavior.