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Related Experiment Video

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Germline-specific dgcr8 knockout in zebrafish using a BACK approach.

Yun Liu1,2, Zeyao Zhu2,3, Idy H T Ho2,4,3

  • 1State Key Laboratory of Biocontrol, Institute of Aquatic Economic Animals, and the Guangdong Province Key Laboratory for Aquatic Economic Animals, Sun Yat-Sen University, Guangzhou, China.

Cellular and Molecular Life Sciences : CMLS
|February 23, 2017
PubMed
Summary

Researchers developed a new bacterial artificial chromosome-rescue-based knockout (BACK) method for conditional gene knockout in zebrafish. This technique enables studying gene functions, like dgcr8, in early development and human disease models.

Keywords:
Crispr-cas9Germ layer specificationMaternal-zygotic transitionSmall regulatory RNAs

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Area of Science:

  • Developmental biology
  • Genetics
  • Molecular biology

Background:

  • Zebrafish are crucial models for studying development and diseases.
  • Efficient spatial and temporal gene knockout methods are needed in zebrafish.

Purpose of the Study:

  • To develop a novel conditional gene knockout strategy in zebrafish.
  • To investigate the role of dgcr8 in early zebrafish development.

Main Methods:

  • Developed the bacterial artificial chromosome-rescue-based knockout (BACK) strategy.
  • Utilized the Cre/loxP system for gene deletion.
  • Generated and analyzed maternal-zygotic dgcr8 (MZdgcr8) zebrafish embryos.

Main Results:

  • Successfully achieved conditional gene knockout of dgcr8 in zebrafish germ line using the BACK method.
  • MZdgcr8 embryos displayed morphological defects resembling MZdicer-like phenotypes.
  • MicroRNA-430 (miR-430) rescued these developmental defects.

Conclusions:

  • The BACK strategy enables effective Cre/loxP-mediated tissue-specific gene knockout in zebrafish.
  • Canonical microRNAs are critical for early embryonic development in zebrafish.