Gene expression in neuroendocrine tissues of a cooperatively lekking bird, the wire-tailed manakin


SOCIETY FOR INTEGRATIVE AND COMPARATIVE BIOLOGY
2021 VIRTUAL ANNUAL MEETING (VAM)
January 3 – Febuary 28, 2021

Meeting Abstract


16-6  Sat Jan 2  Gene expression in neuroendocrine tissues of a cooperatively lekking bird, the wire-tailed manakin Bolton, P E*; Balakrishnan, CN; Ryder, T B; Dakin, R; Moore, I T; Horton, B M; East Carolina University; East Carolina University; Smithsonian Institution; Smithsonian Institution; Virginia Tech; Millersville University peri.bolton@gmail.com

Testosterone (T) is an important modulator of trade-offs in social traits in vertebrates, where high T is typically associated with increased aggression at the expense of prosocial behaviors such as parental care. In the wire-tailed manakin (Pipra filicauda), territorial males participate in cooperative lekking displays with subordinate floater males who generally have lower circulating T. Cooperative behavior positively predicts paternity among territorial males, and ascension of floaters to territorial rank. Recent work has demonstrated that T modulates individual variation in cooperative behavior, with status specific effects. In this study we sought to characterize social status specific gene expression and regulatory networks using RNAseq across steroid responsive tissues in the avian Hypothalamic-Pituitary-Gonadal axis, and the Social Behavior Network of the brain. Across tissues, we identified a ‘landscape’ of differential expression – differences in the numbers of differentially expressed genes. These landscapes varied according to each of the behavioral and hormonal traits measured, showing different tissues have different roles within the SBN and HPG depending on the trait regulated. We also identified tissue and status specific patterns of gene expression using weighted gene co-expression network analysis. We find enrichment for behavioral and neuroendocrine related gene ontology categories, including known key regulators of social behavior such as androgen receptor, and prolactin expression. Our study is the first to use transcriptomics across multiple tissues to address complex social behaviors in a wild animal. Our results are discussed in the context of an integrative understanding of the evolution of androgen mediated phenotypes in birds.

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