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APR 30, 2015 8:00 AM PDT

Swimming in Transcriptomics: Using Next-Gen sequencing to study the evolution of neural circuitry and swimming behavior of sea slugs

Speaker
  • NSERC Postdoctoral Research Fellow, Neuroscience Institute, Georgia State University
    Biography
      Dr. Adriano Senatore obtained his Ph.D. at the University of Waterloo in Ontario, Canada, where he studied the molecular physiology and evolution of ion channels. He received a Governor General's Gold Medal Award for his discoveries about the mechanisms of ion channel selectivity and its evolution. As an NSERC-funded postdoctoral research fellow at Georgia State University (GSU), Adriano has spearheaded efforts to implement transcriptomics towards the study how rhythmic neural circuits in the sea slug brain independently evolved to give rise to analogous forms of swimming behavior in different species. He has also played a central role in promoting transcriptome research at GSU, where he has overseen the establishment of numerous bioinfomatic software pipelines for transcriptome assembly and annotation on the local high performance (HPC) computer, and was part of a consortium of researchers that orchestrated a hardware expansion of the HPC system. Adriano is now preparing for a faculty position at the University of Toronto Mississauga, where he intends to merge his backgrounds in molecular biology and ion channel physiology with transcriptomics and systems level analyses to study evolution of the nervous system.

    Abstract

    Sea slugs (Mollusca, Gastropoda, Nudipleura) provide unique opportunities for studying the evolution of behavior at the levels of single neurons, neural circuits, and their synaptic connections. Of particular interest to us are the mechanisms by which analogous forms of swimming behavior, such as dorsal-ventral (DV) or left-right (LR) body flexions, evolved independently in certain sea slug clades. Transcriptome sequencing has been useful for this research in two ways: first, it provides a means for characterizing the phylogenetic relationships amongst sea slug species, where robust phylogenetic trees can be constructed using hundreds of orthologous gene sequences. Indeed, a strong understanding of species phylogeny is a necessary pre-requisite for formulating hypotheses about how DV and LR swimming might have evolved in different lineages. Secondly, transcriptome sequencing provides unprecedented access to gene sequences from the sea slug brain, which can be used to probe the molecular mechanisms by which single neurons are recruited into rhythmic circuits to drive analogous forms of swimming. To illustrate, the lab previously found that in two species that independently evolved DV swimming, homologous single neurons called C2 independently acquired sensitivity to serotonin (5HT) to potentiate their synapses and activate their corresponding DV swimming neural circuits. We are now testing the hypothesis that convergent alterations in 5HT receptor function/expression in C2 neurons is responsible for this synaptic potentiation, having identified from the transcriptomes full length sequences for all known molluscan 5HT receptors.

    Learning Objectives:
    • Learn how transcriptome sequencing has been useful for the research of sea slugs and the mechanisms by which analogous forms of swimming behavior, such as dorsal-ventral (DV) or left-right (LR) body flexions, evolved independently in certain sea slug clades
    • Learn how transcriptome sequencing provides a means for characterizing the phylogenetic relationships amongst sea slug species, where robust phylogenetic trees can be constructed using hundreds of orthologous gene sequences.
    • Learn how transcriptome sequencing provides unprecedented access to gene sequences from the sea slug brain, which can be used to probe the molecular mechanisms by which single neurons are recruited into rhythmic circuits to drive analogous forms of swimming

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