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A functional cellular framework for sex and estrous cycle-dependent gene expression and behavior.

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This study reveals how specific estrogen receptor 1-expressing (Esr1+) neurons control sex-specific behaviors. Researchers identified distinct Esr1+ cell types crucial for male sex recognition and female mating, highlighting cellular specialization in social behavior regulation.

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Area of Science:

  • Neurobiology
  • Endocrinology
  • Behavioral Neuroscience

Background:

  • Sex hormones significantly influence gendered behaviors.
  • The precise neuronal mechanisms underlying sex-typical behavior regulation by sex hormone-responsive populations remain largely unknown.

Purpose of the Study:

  • To investigate the role of individual estrogen receptor 1-expressing (Esr1+) neuronal populations in regulating sex-specific behaviors.
  • To identify specific Esr1+ cell types and their functions within broader neuronal networks.

Main Methods:

  • Orthogonal, genetically targeted sequencing of four Esr1+ populations.
  • Differential gene expression analysis between sexes and estrous states.
  • Functional characterization of identified Esr1+ cell types (BNSTprTac1/Esr1 and VMHvlCckar/Esr1).

Main Results:

  • Identified 1,415 differentially expressed genes across 137 Esr1+ cell types.
  • Discovered that BNSTprTac1/Esr1 cells are essential for male sex recognition.
  • Found that VMHvlCckar/Esr1 cells are crucial for female mating behavior.
  • Demonstrated distinct projections for VMHvlCckar/Esr1 cells compared to other VMHvlEsr1 cells.

Conclusions:

  • Specific Esr1+ cell types exhibit functional and projection specialization.
  • This cellular specialization enables sex hormone-responsive populations to regulate diverse social behaviors.
  • Understanding these dimorphic cell types provides insights into the neurobiological basis of sex-typical behaviors.