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Initiation of neural induction by FGF signalling before gastrulation
A Streit1, A J Berliner, C Papanayotou
1Department of Genetics and Development, Columbia University, New York, New York 10032, USA.
Nature
|July 14, 2000
Summary
Neural induction begins before gastrulation, challenging previous timelines. Early response gene ERNI and fibroblast growth factor signaling from the organizer initiate this crucial developmental process.
Area of Science:
- Developmental biology
- Embryogenesis
- Molecular biology
Background:
- Neural induction establishes the vertebrate nervous system from ectodermal cells.
- This process is typically associated with the mid-gastrula stage of embryogenesis.
- The 'organizer' region, including Hensen's node, plays a critical role in directing neural development.
Purpose of the Study:
- To investigate the precise timing of neural induction during vertebrate embryogenesis.
- To identify early molecular markers and signaling pathways involved in neural induction.
- To challenge the established timeline of neural induction onset.
Main Methods:
- Isolation and characterization of ERNI, an early response gene.
- Utilizing ERNI as a molecular marker to track neural induction.
- Investigating the role of fibroblast growth factor (FGF) signaling from the organizer.
Main Results:
- Evidence suggests neural induction commences prior to gastrulation.
- ERNI expression serves as an early indicator of neural induction.
- The organizer and its precursor cells secrete FGF, initiating and sustaining neural induction.
Conclusions:
- Neural induction initiates earlier in embryonic development than previously understood.
- FGF signaling from the organizer is essential for initiating neural induction.
- ERNI is a key early marker for understanding the onset of neural development.
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