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Neural patterning in the vertebrate embryo.

C R Altmann1, A H Brivanlou

  • 1The Rockefeller University, New York, New York 10021, USA.

International Review of Cytology
|December 29, 2000
PubMed
Summary

Embryonic central nervous system (CNS) development involves intricate patterning along multiple axes. Understanding the complex interplay of signaling pathways is crucial for deciphering CNS formation.

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Area of Science:

  • Developmental biology
  • Neuroscience
  • Genetics

Background:

  • The embryonic central nervous system (CNS) is patterned along antero-posterior, dorsal-ventral, and left-right axes.
  • Key signaling pathways like SHH, BMP/GDF, Wnt, and retinoic acid are involved in dorsal-ventral patterning.
  • Antero-posterior patterning establishes major brain divisions and spinal cord identity, influenced by FGF, Wnt, retinoic acid, and Hox genes.

Purpose of the Study:

  • To elucidate the complex signaling interactions governing embryonic CNS patterning.
  • To detail the roles of various signaling pathways in establishing axial and regional identities within the developing nervous system.

Main Methods:

  • Review and synthesis of existing literature on embryonic CNS patterning.
  • Analysis of gene expression patterns, including Hox genes and neuromeric organization.
  • Examination of signaling pathway involvement (SHH, BMP/GDF, Wnt, retinoic acid, FGF, Nodal, Lefty).

Main Results:

  • Dorsal-ventral patterning is controlled by opposing SHH and BMP/GDF gradients, with Wnt and retinoic acid also playing roles.
  • Antero-posterior patterning involves FGF, Wnt, and retinoic acid, leading to distinct brain regions and spinal cord, further refined by Hox gene expression.
  • Left-right axis patterning initiates early via activin, Nodal, and Lefty signaling.

Conclusions:

  • Embryonic CNS patterning is a highly coordinated process involving multiple signaling pathways acting both temporally and spatially.
  • Further research is needed to fully understand the intricate interactions between these pathways in generating the complex adult nervous system.

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