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Related Concept Videos

Fixed Action Patterns01:06

Fixed Action Patterns

A fixed action pattern (FAP) is a specific, hard-wired sequence of behaviors that occurs in response to an external stimulus, called a sign stimulus. The behavior is “fixed” because it is essentially unchangeable—proceeding similarly across individuals of a species every time it occurs.
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Control of Cell Geometry through Infrared Laser Assisted Micropatterning
11:04

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Published on: July 10, 2021

Vg1 has specific processing requirements that restrict its action to body axis patterning centers.

John Terrig Thomas1, Malcolm Moos

  • 1Division of Cellular and Gene Therapies, Center for Biologics Evaluation and Research, U.S. Food and Drug Administration, Bethesda, MD 20892, USA. john.thomas@fda.hhs.gov

Developmental Biology
|August 21, 2007
PubMed
Summary

Vg1 protein requires specific enzyme cleavage for activation, unlike other TGF-beta members. This restricted processing explains why Vg1 typically remains inactive in Xenopus embryos, enabling localized developmental patterning.

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Area of Science:

  • Developmental Biology
  • Molecular Biology
  • Protein Biochemistry

Background:

  • Transforming growth factor-beta (TGF-beta) superfamily members play crucial roles in embryonic development.
  • Vg1, a member of the TGF-beta superfamily, has not shown significant phenotypic effects upon overexpression in Xenopus embryos.
  • Previous studies suggested stringent requirements for Vg1 activation, possibly due to proteolytic processing.

Purpose of the Study:

  • To investigate the proteolytic processing requirements for Vg1 activation.
  • To understand the biological and biochemical mechanisms underlying Vg1's limited in vivo activity.
  • To reconcile Vg1's function with models of embryonic pattern formation.

Main Methods:

  • Utilized artificial chimeric constructs of Vg1.
  • Analyzed a second allele of Vg1.
  • Performed biological and biochemical assays to study proteolytic cleavage.
  • Examined expression patterns of Vg1 and associated proteases in Xenopus embryos.

Main Results:

  • Demonstrated that Vg1 requires cleavage by two distinct proteases for effective activation.
  • Showed a highly restricted overlap in the expression patterns of Vg1 and the necessary activating proteases.
  • Confirmed that the majority of Vg1 protein in vivo exists in an unprocessed form.

Conclusions:

  • Two specific proteases are essential for Vg1 activation.
  • Limited protease availability and restricted expression patterns explain Vg1's inactive state in vivo.
  • This mechanism supports localized Vg1 action, consistent with developmental pattern formation models.