ZFIN ID: ZDB-PUB-040304-8
Identification and morphogenesis of the eminentia thalami in the zebrafish
Wullimann, M.F., and Mueller, T.
Date: 2004
Source: The Journal of comparative neurology   471(1): 37-48 (Journal)
Registered Authors: Mueller, Thomas, Wullimann, Mario F.
Keywords: none
MeSH Terms:
  • Animals
  • Basic Helix-Loop-Helix Transcription Factors
  • Body Patterning/physiology
  • Cell Differentiation/physiology
  • Cell Movement/physiology
  • ELAV Proteins
  • Entopeduncular Nucleus/embryology*
  • Entopeduncular Nucleus/growth & development
  • Entopeduncular Nucleus/metabolism
  • Eye Proteins
  • Gene Expression Profiling
  • Gene Expression Regulation, Developmental*
  • Homeodomain Proteins/metabolism
  • Immunohistochemistry
  • Morphogenesis
  • Nerve Tissue Proteins/metabolism*
  • Neurons/metabolism*
  • Paired Box Transcription Factors
  • Proliferating Cell Nuclear Antigen/metabolism
  • RNA-Binding Proteins/metabolism
  • Repressor Proteins
  • Thalamus/embryology*
  • Thalamus/growth & development
  • Thalamus/metabolism
  • Transcription Factors/metabolism
  • Zebrafish/embryology*
  • Zebrafish/metabolism
  • Zebrafish Proteins/metabolism*
PubMed: 14983474 Full text @ J. Comp. Neurol.
ABSTRACT
This study documents early zebrafish brain expression patterns (2-5 days postfertilization) of proliferating neural (PCNA) as well as early-determined (Pax6, Zash-1a, Zash-1b, neurogenin1, neuroD) and differentiating (Hu-proteins) neuronal cells. These patterns are used to outline the spatiotemporal local dynamics of secondary neurogenesis as well as neuronal migration and differentiation in the region of the eminentia thalami. The analysis presented not only allows identification for the first time of the eminentia thalami in the zebrafish model system (because it forms a neurogenin1/neuroD-guided locus of neurogenesis in contrast to adjacent preoptic region and ventral thalamus) but furthermore shows that the entopeduncular complex is a derivative of the embryonic zebrafish eminentia thalami, which has never been reported for a teleost before. An analysis of the relevant literature shows that the mammalian entopeduncular nucleus/avian paleostriatum primitivum/reptilian globus pallidus clearly are part of the basal ganglia (i.e., the pallidum). In amniote embryos, an anterior entopeduncular area is recognized at the base of the medial ganglionic eminence (i.e., the future pallidum; part of alar plate of prosomere 5), separate from the more posterior eminentia thalami (alar prosomere 4). There is a comparable periventricular eminentia thalami in (young and adult) amphibians and teleosts. However, the migrated anterior entopeduncular nucleus of anuran amphibians likely is homologous to part of the pallidum of other vertebrates and has no developmental relationship to the eminentia thalami. In contrast, the migrated teleostean entopeduncular complex does not correspond to a pallidal division but is indeed the adult derivative of the early-recognized eminentia thalami as shown in this study.
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