Study finds that prairie voles without oxytocin receptors can bond with mates and young. The vital role of oxytocin—the “love hormone”—for social attachments is being called into question. More than forty years of pharmacological and behavioral research has pointed to oxytocin receptor signaling
wanted to know whether pair-bonding was really controlled by oxytocin receptor signaling. To test this, they used CRISPR to generate prairie voles that lack functional oxytocin receptors. Then, they tested these mutant oxytocin-receptor-less voles to see whether they could form enduring partnerships with other voles. To their surprise, the mutant voles formed pair-bonds just as readily as normal voles.
“We found that mutant voles are not only able to give birth, but actually nurse,” says Shah. Both male and female mutants engaged in the usual parental behaviors of huddling, licking, and grooming, and were able to rear pups to weaning age. When asked why their results differ from previously published studies that used drugs to block oxytocin receptor signaling, the authors point to the key difference between genetic and pharmacological studies: precision. “Drugs can be dirty,” says Manoli, “in the sense that they can bind to multiple receptors, and you don’t know which binding action is causing the effect.
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