Some Mice Are Doting Dads, While Others Ignore or Attack Their Offspring. Researchers Just Figured Out Why

In African striped mice, the activity of one gene can dramatically change a male’s parenting style, according to a new study

Sarah Kuta | Daily Correspondent

March 17, 2026

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Most mammalian dads don’t stick around to help raise their offspring, leaving that job solely to their female mates. Even among the roughly three to five percent of mammal species in which males do participate in caregiving, scientists have observed a wide range of fatherly behaviors—from doting to neglectful to violent.

Now, new research suggests that a mix of social circumstances and genetics might help explain these differences in one species: the African striped mouse. Social context can affect gene activity in the animals’ brains, and one gene in particular seems to act like a molecular “switch” that can change a male mouse’s parenting style, according to a study published February 18 in the journal Nature.

Biologically speaking, all the species’ males have “what they need to be good dads,” says study co-author Catherine Peña, a neuroscientist at Princeton University, to Scientific American’s Jackie Flynn Mogensen. However, the findings suggest there “may be optimal conditions to help promote one’s own best parenting.”

Native to southern Africa, the African striped mouse is a small, adaptable rodent with four parallel lines running down its back. Males’ parenting styles vary greatly: Some fathers groom and protect their pups from the elements, while others ignore or even attack their young.

Researchers wondered if some neurobiological or environmental factors might help explain this natural variation, so they set up a series of laboratory experiments involving male mice and pups.

They raised some of the males in solitary cages, and others in communal housing with three to four other males around the same age. When they introduced pups, the males that had been raised alone tended to be more caring toward the youngsters than those that had been raised in groups.

In another experiment, researchers exposed male mice to either an empty cage or an unfamiliar pup. Being near the pup lit up an area of the mice’s brain known as the medial preoptic area (MPOA); it was especially active in the more nurturing males. This region has long been associated with maternal care in mammals, and it seems to act as a parenting hub within the brain.

“Many of the same neural responses … that are beginning to be so well documented for maternal behavior, those same brain regions are at work in males as well,” says Sarah Hrdy, an anthropologist at the University of California, Davis, who was not involved with the research, to Science News’ Viviane Callier.

Measuring gene activity in MPOA cells revealed that a gene called Agouti was more active in the hostile males than in the nurturing males. The Agouti gene is more widely known for its involvement in metabolism and skin pigmentation—including the development of the mice’s signature stripes—so this finding was surprising.

Artificially boosting Agouti gene expression in the MPOA made mice more ambivalent or hostile toward pups. And when scientists moved mice from group housing to solo cages, their Agouti expression naturally decreased and they became more nurturing.

Together, the results support Agouti’s key role in parenting behavior among African striped mice fathers. Based on the findings, scientists think the gene probably responds to social cues and switches off paternal behaviors in males.

“The study is highly rigorous, and the results are exciting, revealing a surprising molecular mechanism by which social environment actively represses parenting in males by modulating Agouti expression in the hypothalamic MPOA,” says Catherine Dulac, a neuroscientist at Harvard University who was not involved with the study, in an accompanying research briefing in Nature.

Researchers don’t fully understand why Agouti expression seems to change based on the animals’ social setting. But they suspect it has something to do with social competition and population density, which might affect the mice’s innate focus on self-preservation versus investment in their offspring.

“This animal has evolved the ability to take in information from its environment and to regulate its behaviors that are often energetically demanding,” study co-author Ricardo Mallarino, a molecular biologist at Princeton University, tells Science News.

Humans also have the MPOA and Agouti gene. However, the researchers urge against applying the findings more broadly. Future research might explore whether neurobiological factors might play a similar role in child abuse and neglect in people.

For now, however, they’re not suggesting “you can take a pill to become a better parent, or that struggles with parenting reflect some molecular deficiency,” Peña says in a statement.

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Sarah Kuta is a writer and editor based in Longmont, Colorado. She covers history, science, travel, food and beverage, sustainability, economics and other topics.