Social context matters when studying the genetics of social behavior
Social behavior is heritable but heterogeneous. A mother reporting on her toddler learning to share, a teacher observing a schoolchild navigating friendships and peer relations, and a teenager describing their own social relations are all examples of social behavior within a social context.
Vocal communication is a behavior shared by many vertebrates, starting from birth with infants' cries. These cries differ in various situations to call for parental care that suits the infant's needs, and across species to suit each species' ecology and social system. This variety offers a chance to discover the mechanisms behind flexible neonatal vocal behaviors and their development over time.
Previously, researchers described neonatal vocalizations in North American deer mice, a model for studying behavioral evolution, and found genetic differences in these vocalizations. Now, they are looking at one aspect of these vocalizations, their timing, which conveys information about the infant's distress. They discovered that the timing in deer mouse cries differs more between species than the frequency of their sounds.
Furthermore, they found that the length of a cry affects the likelihood of a parent responding to their pup's cries. To understand the reasons behind this natural variation in cry length, they first examined the cerebellar system, a brain part that helps regulate the timing of motor movements. They discovered differences in the size of the neonatal cerebellum and another brain region, the inferior olive, across the species.
They also found that changing the function of the connection between these two regions alters the timing of the neonatal cries. Finally, they mapped the genetic factors that influence the length of the neonatal cries across species. They found a specific gene region significantly linked to cry duration, and some of the genes in this region are likely responsible for the differences in the timing of infant crying.
Some of these genes are expressed differently in each species, work in the developing cerebellum, and are involved in regulating the duration of neonatal vocal signals in house mice. Overall, their research shows how the cerebellar system contributes to neonatal social behaviors and proposes testable theories about the origin of infant crying based on neural and genetic factors.
Written by urgent.news from bioRxiv's reporting — not their text. Machine-written — may contain errors; check the original before relying on it.
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