Social Dominance Reorganizes the Transcriptomic Neuropeptidome in a Highly Social Cichlid Fish

Area of Science:

• Neuroscience
• Genomics
• Behavioral Biology

Background:

• Social behavior is regulated by complex gene networks in the brain.
• The preoptic area (POA) and hypothalamus are key brain regions for social behavior.
• Understanding gene networks in these regions is crucial for deciphering social behavior regulation.

Purpose of the Study:

• To investigate how social status affects cellular gene expression in the hypothalamus and POA.
• To explore changes in gene co-expression networks related to social status.
• To analyze the transcriptomic neuropeptidome's role in social dominance.

Main Methods:

• Single-nucleus RNA sequencing was performed on the hypothalamus and POA of *Astatotilapia burtoni*.
• Gene co-expression networks were analyzed to identify changes associated with social status.
• A novel approach was used to integrate the transcriptomic neuropeptidome and social state.

Main Results:

• Social status significantly alters gene co-expression networks across neuronal populations.
• Specific transcriptomic signatures of social dominance were identified in AVP neuronal cell types.
• The study provides insights into the integration of the transcriptomic neuropeptidome with social state.

Conclusions:

• Social status influences gene expression networks at the cellular level in the hypothalamus and POA.
• Neuropeptide gene networks play a significant role in regulating social behavior and dominance.
• This research offers a framework for studying the evolution of social behavior mechanisms.