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A Social Network Approach Reveals Associations between Mouse Social Dominance and Brain Gene Expression.

So N, Franks B, Lim S, Curley JP - PLoS ONE (2015)

Bottom Line: Though grooming ties between individuals were largely independent of other social networks, sniffing relationships were highly predictive of the directionality of agonistic relationships.Individual variation in dominance status was associated with brain gene expression, with more dominant individuals having higher levels of corticotropin releasing factor mRNA in the medial and central nuclei of the amygdala and the medial preoptic area of the hypothalamus, as well as higher levels of hippocampal glucocorticoid receptor and brain-derived neurotrophic factor mRNA.This study demonstrates the potential and significance of combining complex social housing and intensive behavioral characterization of group-living animals with the utilization of novel statistical methods to further our understanding of the neurobiological basis of social behavior at the individual, relationship and group levels.

View Article: PubMed Central - PubMed

Affiliation: Psychology Department, Columbia University, New York, NY 10027, United States of America; Doctoral Program in Neurobiology and Behavior, Columbia University, New York, NY 10025, United States of America.

ABSTRACT
Modelling complex social behavior in the laboratory is challenging and requires analyses of dyadic interactions occurring over time in a physically and socially complex environment. In the current study, we approached the analyses of complex social interactions in group-housed male CD1 mice living in a large vivarium. Intensive observations of social interactions during a 3-week period indicated that male mice form a highly linear and steep dominance hierarchy that is maintained by fighting and chasing behaviors. Individual animals were classified as dominant, sub-dominant or subordinate according to their David's Scores and I& SI ranking. Using a novel dynamic temporal Glicko rating method, we ascertained that the dominance hierarchy was stable across time. Using social network analyses, we characterized the behavior of individuals within 66 unique relationships in the social group. We identified two individual network metrics, Kleinberg's Hub Centrality and Bonacich's Power Centrality, as accurate predictors of individual dominance and power. Comparing across behaviors, we establish that agonistic, grooming and sniffing social networks possess their own distinctive characteristics in terms of density, average path length, reciprocity out-degree centralization and out-closeness centralization. Though grooming ties between individuals were largely independent of other social networks, sniffing relationships were highly predictive of the directionality of agonistic relationships. Individual variation in dominance status was associated with brain gene expression, with more dominant individuals having higher levels of corticotropin releasing factor mRNA in the medial and central nuclei of the amygdala and the medial preoptic area of the hypothalamus, as well as higher levels of hippocampal glucocorticoid receptor and brain-derived neurotrophic factor mRNA. This study demonstrates the potential and significance of combining complex social housing and intensive behavioral characterization of group-living animals with the utilization of novel statistical methods to further our understanding of the neurobiological basis of social behavior at the individual, relationship and group levels.

No MeSH data available.


Related in: MedlinePlus

Frequency of observed social interactions.a) Fighting, b) Chasing, c) All aggression, d) Sniffing, e) Grooming. Behaviors are directed from individuals in rows to those in columns.
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pone.0134509.g002: Frequency of observed social interactions.a) Fighting, b) Chasing, c) All aggression, d) Sniffing, e) Grooming. Behaviors are directed from individuals in rows to those in columns.

Mentions: The frequency interaction sociomatrices and binarizedsociomatrices are presented in Fig 2 and S2 and S3 Figs.


A Social Network Approach Reveals Associations between Mouse Social Dominance and Brain Gene Expression.

So N, Franks B, Lim S, Curley JP - PLoS ONE (2015)

Frequency of observed social interactions.a) Fighting, b) Chasing, c) All aggression, d) Sniffing, e) Grooming. Behaviors are directed from individuals in rows to those in columns.
© Copyright Policy
Related In: Results  -  Collection

License
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getmorefigures.php?uid=PMC4520683&req=5

pone.0134509.g002: Frequency of observed social interactions.a) Fighting, b) Chasing, c) All aggression, d) Sniffing, e) Grooming. Behaviors are directed from individuals in rows to those in columns.
Mentions: The frequency interaction sociomatrices and binarizedsociomatrices are presented in Fig 2 and S2 and S3 Figs.

Bottom Line: Though grooming ties between individuals were largely independent of other social networks, sniffing relationships were highly predictive of the directionality of agonistic relationships.Individual variation in dominance status was associated with brain gene expression, with more dominant individuals having higher levels of corticotropin releasing factor mRNA in the medial and central nuclei of the amygdala and the medial preoptic area of the hypothalamus, as well as higher levels of hippocampal glucocorticoid receptor and brain-derived neurotrophic factor mRNA.This study demonstrates the potential and significance of combining complex social housing and intensive behavioral characterization of group-living animals with the utilization of novel statistical methods to further our understanding of the neurobiological basis of social behavior at the individual, relationship and group levels.

View Article: PubMed Central - PubMed

Affiliation: Psychology Department, Columbia University, New York, NY 10027, United States of America; Doctoral Program in Neurobiology and Behavior, Columbia University, New York, NY 10025, United States of America.

ABSTRACT
Modelling complex social behavior in the laboratory is challenging and requires analyses of dyadic interactions occurring over time in a physically and socially complex environment. In the current study, we approached the analyses of complex social interactions in group-housed male CD1 mice living in a large vivarium. Intensive observations of social interactions during a 3-week period indicated that male mice form a highly linear and steep dominance hierarchy that is maintained by fighting and chasing behaviors. Individual animals were classified as dominant, sub-dominant or subordinate according to their David's Scores and I& SI ranking. Using a novel dynamic temporal Glicko rating method, we ascertained that the dominance hierarchy was stable across time. Using social network analyses, we characterized the behavior of individuals within 66 unique relationships in the social group. We identified two individual network metrics, Kleinberg's Hub Centrality and Bonacich's Power Centrality, as accurate predictors of individual dominance and power. Comparing across behaviors, we establish that agonistic, grooming and sniffing social networks possess their own distinctive characteristics in terms of density, average path length, reciprocity out-degree centralization and out-closeness centralization. Though grooming ties between individuals were largely independent of other social networks, sniffing relationships were highly predictive of the directionality of agonistic relationships. Individual variation in dominance status was associated with brain gene expression, with more dominant individuals having higher levels of corticotropin releasing factor mRNA in the medial and central nuclei of the amygdala and the medial preoptic area of the hypothalamus, as well as higher levels of hippocampal glucocorticoid receptor and brain-derived neurotrophic factor mRNA. This study demonstrates the potential and significance of combining complex social housing and intensive behavioral characterization of group-living animals with the utilization of novel statistical methods to further our understanding of the neurobiological basis of social behavior at the individual, relationship and group levels.

No MeSH data available.


Related in: MedlinePlus