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Related Experiment Videos

Graded retinoid responses in the developing hindbrain

S F Godsave1, C H Koster, A Getahun

  • 1Netherlands Institute for Developmental Biology, Utrecht.

Developmental Dynamics : an Official Publication of the American Association of Anatomists
|September 11, 1998
PubMed
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Retinoids, like retinoic acid (RA), likely do not pattern the entire vertebrate central nervous system (CNS). However, RA gradients may pattern the developing hindbrain by inducing specific genes at different concentrations.

Area of Science:

  • Developmental Biology
  • Neuroscience
  • Molecular Biology

Background:

  • Morphogens are signaling molecules that guide tissue patterning during development.
  • Retinoids, a class of compounds related to vitamin A, are known to play crucial roles in embryonic development.
  • The precise role of retinoids in specifying the anteroposterior (a-p) axis of the vertebrate central nervous system (CNS) remains an area of active investigation.

Purpose of the Study:

  • To investigate whether retinoids function as morphogens in patterning the developing vertebrate CNS.
  • To determine the concentration-dependent effects of retinoic acid (RA) on the expression of a-p patterning genes in neural tissue.

Main Methods:

  • In vivo and in vitro experimental systems were utilized to study neural patterning.

Related Experiment Videos

  • The expression patterns of specific a-p patterning genes were analyzed in response to varying concentrations of RA.
  • Concentration-dependent effects of RA on gene induction were characterized.

    • Main Results:

    • Retinoic acid (RA) is unlikely to specify the anteroposterior (a-p) level across the entire CNS.
    • Data suggest that RA acts as a morphogen within a specific region of the developing CNS.
    • The developing hindbrain appears to be patterned by a gradient of RA, with higher concentrations inducing more posterior gene expression patterns.

    Conclusions:

    • The findings challenge the notion of retinoids patterning the entire CNS a-p axis.
    • Evidence supports a role for RA gradients in the localized patterning of the developing hindbrain.
    • Specific RA concentration windows correlate with the induction of distinct hindbrain patterning genes, indicating regional specificity.