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Efficient ectopic gene expression targeting chick mesoderm.

Kerby C Oberg1, Charmaine U Pira, Jean-Pierre Revelli

  • 1Department of Pathology and Human Anatomy, Loma Linda University, Loma Linda, California 92350, USA. koberg@som.llu.edu

Developmental Dynamics : an Official Publication of the American Association of Anatomists
|July 12, 2002
PubMed
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Researchers optimized gene delivery methods for chick mesoderm development. Confined microelectroporation (CMEP) with a beta-actin promoter vector and mineral oil proved most effective for consistent, reproducible ectopic gene expression in early vertebrate development.

Area of Science:

  • Developmental Biology
  • Molecular Biology
  • Gene Expression

Background:

  • The chick embryo is a key model for studying early vertebrate development and pattern formation.
  • Understanding gene interactions requires precise control over ectopic gene expression.

Purpose of the Study:

  • To develop and optimize consistent methods for focal ectopic gene expression in chick mesoderm.
  • To compare different gene delivery techniques and expression vectors for efficiency and reproducibility.

Main Methods:

  • Evaluated viral vector-mediated gene transfer, direct adenoviral injection, and electroporation (EP) in chick wing bud mesoderm (stages 19-21).
  • Utilized beta-galactosidase and green fluorescent protein (GFP) as reporters.
  • Compared expression constructs including CMV and beta-actin promoters, and IRES-GFP vectors.

Related Experiment Videos

  • Assessed functional gene transfer using Shh and Hoxb-8 constructs to induce digit duplication.

    • Main Results:

    • A beta-actin promoter vector with a bovine papilloma virus fragment showed superior mesodermal expression compared to CMV-driven vectors.
    • Mineral oil enhanced vector localization and containment at the injection site for EP and viral injection.
    • Confined microelectroporation (CMEP) using insulated microelectrodes was favored for its speed, efficiency, consistency, and reproducibility.

    Conclusions:

    • Optimized gene transfer into chick mesoderm is achievable using CMEP.
    • The beta-actin promoter and mineral oil are key components for enhancing ectopic gene expression.
    • CMEP offers a reliable method for dissecting gene function in early vertebrate development.