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Molecular aspects of monogamy
1Department of Psychiatry and Behavioral Sciences, Emory University, Atlanta, Georgia 30322, USA. insel@rmy.emory.edu
Annals of the New York Academy of Sciences
|January 15, 1997
Summary
Species differences in oxytocin (OT) receptor brain expression influence pair bonding behaviors in voles. Gene sequencing revealed subtle differences between prairie and montane voles, suggesting complex regulatory mechanisms for OT receptor expression.
Area of Science:
- Neuroscience
- Behavioral Biology
- Genetics
Background:
- Comparative studies reveal species-specific regional expression of oxytocin (OT) receptors in the brains of monogamous and nonmonogamous voles.
- These OT receptor distribution differences are functionally relevant, impacting pair-bonding behaviors in monogamous species like the prairie vole.
Purpose of the Study:
- To investigate the genetic mechanisms controlling tissue-specific oxytocin receptor expression.
- To compare the oxytocin receptor gene sequences of prairie voles and montane voles.
Main Methods:
- Comparative neuroanatomy of neurotransmitter receptors.
- Gene sequencing of the oxytocin receptor in prairie voles and montane voles.
- Pharmacological manipulation using OT agonists and antagonists.
Main Results:
- Significant species differences in OT receptor brain expression were observed, correlating with mating systems (monogamy vs. promiscuity).
- While prairie voles and montane voles show regulatory sequence differences from rats and humans, their own sequences exhibit only subtle variations.
- Pharmacological studies confirmed the role of OT in pair-bonding behaviors.
Conclusions:
- Species-specific regulation of oxytocin receptor expression is a key factor in the evolution of social behaviors, particularly pair bonding.
- Subtle genetic differences in regulatory sequences may underlie significant neuroanatomical and behavioral variations.
- Further research is needed to explore transactivating factors influencing OT receptor expression and the functional consequences of subtle vole species differences.