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Title page for ETD etd-08042014-210109


Type of Document Dissertation
Author Dean, Benjamin Jurrien
Author's Email Address benjamin.j.dean@vanderbilt.edu
URN etd-08042014-210109
Title Neurogenic Determinants of Left-Right Brain Asymmetry: Developmental Investigations of the Zebrafish Habenular Nuclei
Degree PhD
Department Neuroscience
Advisory Committee
Advisor Name Title
David M. Miller III Committee Chair
Charles C. Hong Committee Member
Douglas G. McMahon Committee Member
Joshua T. Gamse Committee Member
Keywords
  • brain development
  • neurogenesis
  • Danio rerio
Date of Defense 2014-07-18
Availability unrestricted
Abstract
Left-Right asymmetry of the CNS is a highly conserved feature across vertebrate classes. Asymmetry is manifest at the levels of function and connectivity. But the neural correlates of these asymmetries and their developmental underpinnings are just beginning to be explored. The zebrafish habenular nuclei have functional as well as neuronal asymmetries and offer a molecularly manipulable and highly visualizable model to studying the cellular and developmental origins of CNS left-right asymmetry. Here I report an evolving developmental network that regulates the timing of habenular neurogenesis. This network involved environmental and endocrine cues (light and melatonin), morphogenetic pathways (FGF and Nodal) and several neurogenic genes (dbx1b, lhx9, kip2 and her6). These components act as a temporal ‘neurogenic gate,’ dictating the onset of neurogenesis. This neurogenic gate is regulated asymmetrically – acting first in the left habenula driving earlier neurogenesis there – and impacts neuronal cell type specification. Together these findings deepen our understanding of the molecular mechanisms that drive neural fate specification and how these components can give rise to left-right asymmetry in the CNS.
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