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A Rapid In Vivo Bioassay for Developmentally Active Enhancers
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A medium-scale assay for enhancer validation in amniotes.

Jingchen Chen1, Andrea Streit1

  • 1Department of Craniofacial Development and Stem Cell Biology, Dental Institute, King's College London, London, United Kingdom.

Developmental Dynamics : an Official Publication of the American Association of Anatomists
|July 17, 2015
PubMed
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Researchers developed a new method to test gene enhancers in chick embryos. This rapid, cost-effective technique validates enhancer activity in vertebrates, offering an alternative to transgenic models.

Area of Science:

  • Developmental Biology
  • Genetics
  • Molecular Biology

Background:

  • Enhancers regulate gene expression crucial for development, homeostasis, and disease.
  • Genome-wide studies predict many enhancers, but in vivo validation is challenging.
  • Current high-throughput enhancer evaluation methods are limited to invertebrates and in vitro systems.

Purpose of the Study:

  • To develop a novel method for validating potential enhancers in vivo within an amniote embryo.
  • To establish a medium-scale, efficient assay for assessing enhancer spatiotemporal activity.

Main Methods:

  • A novel assay was designed for the chick embryo (an amniote vertebrate).
  • Unique barcodes were incorporated into reporter vectors to distinguish multiple enhancers.
Keywords:
PCRconserved regulatory elementselectroporationgreen fluorescent protein (GFP)otic placoderegulatory regionsreporter plasmid

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  • One-step RT-PCR was used to detect the activity of nine distinct enhancers simultaneously within a single embryo.

    • Main Results:

    • The method successfully validated the activity of nine separate enhancers in a single chick embryo.
    • The assay demonstrated high sensitivity, allowing for potential expansion with more barcoded vectors.
    • This technique enables medium-scale enhancer validation in a vertebrate model.

    Conclusions:

    • This method offers a rapid, sensitive, and cost-effective approach for assessing enhancer activity in amniote vertebrates.
    • It presents a valuable alternative to generating transgenic animals for enhancer validation.
    • The technique advances the field of gene regulation studies in vertebrates.