Comparative neurotranscriptomics reveal widespread species differences associated with bonding.

Area of Science:

• Neuroscience
• Genetics
• Behavioral Biology

Background:

• Pair bonding is rare in mammals but central to human social behavior.
• Previous research on prairie voles identified some neural mechanisms for pair bonding.
• Limited studies explored the full spectrum of neural gene expression differences across species.

Purpose of the Study:

• To test if neural gene expression differences underlie varying capacities for pair bonding.
• To compare gene expression in brain regions critical for social behavior between prairie and meadow voles.
• To investigate gene expression changes at baseline, after mating, and during bond formation.

Main Methods:

• RNA-sequencing of amygdala, hypothalamus, and ventral pallidum/nucleus accumbens.
• Comparison of gene expression in virgin and post-mating prairie voles (Microtus ochrogaster) and meadow voles (M. pennsylvanicus).
• Analysis of species and brain region effects on gene expression, including co-regulated gene modules.

Main Results:

• Species and brain region were primary drivers of gene expression.
• Virgin voles showed species differences in genes related to cell structure, translation, and metabolism.
• Post-mating, differential expression of genes involved in transcription, neuron structure, and synaptic plasticity was observed.
• Co-regulated gene modules correlated with brain region in both species and with post-mating time in prairie voles.

Conclusions:

• Pre-mating neural differences confer pair-bonding ability in prairie voles.
• Gene ontology analysis supports the role of transcriptional regulation and neuronal structure changes in pair bonding.
• Findings expand knowledge of genes involved in pair bonding and suggest future research directions.