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Related Concept Videos

MicroRNAs01:22

MicroRNAs

MicroRNA (miRNA) are short, regulatory RNA transcribed from introns—non-coding regions of a gene—or intergenic regions—stretches of DNA present between genes. Several processing steps are required to form biologically active, mature miRNA. The initial transcript, called primary miRNA (pri-mRNA), base-pairs with itself forming a stem-loop structure. Within the nucleus, an endonuclease enzyme, called Drosha, shortens the stem-loop structure into hairpin-shaped pre-miRNA. After the pre-miRNA ends...
MicroRNAs01:22

MicroRNAs

MicroRNA (miRNA) are short, regulatory RNA transcribed from introns (non-coding regions of a gene) or intergenic regions (stretches of DNA present between genes). Several processing steps are required to form biologically active, mature miRNA. The initial transcript, called primary miRNA (pri-mRNA), base-pairs with itself, forming a stem-loop structure. Within the nucleus, an endonuclease enzyme, called Drosha, shortens the stem-loop structure into hairpin-shaped pre-miRNA. After the pre-miRNA...

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Related Experiment Video

Updated: Jul 6, 2026

Micromanipulation of Gene Expression in the Adult Zebrafish Brain Using Cerebroventricular Microinjection of Morpholino Oligonucleotides
05:48

Micromanipulation of Gene Expression in the Adult Zebrafish Brain Using Cerebroventricular Microinjection of Morpholino Oligonucleotides

Published on: May 23, 2013

MicroRNAs regulate brain morphogenesis in zebrafish.

Antonio J Giraldez1, Ryan M Cinalli, Margaret E Glasner

  • 1Developmental Genetics Program, Skirball Institute of Biomolecular Medicine and Department of Cell Biology, New York University School of Medicine, New York, NY 10016, USA. giraldez@saturn.med.nyu.edu

Science (New York, N.Y.)
|March 19, 2005
PubMed
Summary
This summary is machine-generated.

Maternal-zygotic dicer (MZdicer) zebrafish mutants lack mature microRNAs (miRNAs), impacting development. Restoring specific miRNAs rescues brain defects, highlighting their crucial role in morphogenesis.

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Area of Science:

  • Developmental Biology
  • Molecular Biology
  • Genetics

Background:

  • MicroRNAs (miRNAs) are key post-transcriptional regulators of gene expression.
  • The Dicer enzyme is essential for miRNA processing and function.
  • Understanding miRNA roles in development requires tools to block miRNA biogenesis.

Purpose of the Study:

  • To investigate the essential roles of microRNAs (miRNAs) in zebrafish development.
  • To characterize the function of Dicer domains in miRNA biogenesis and silencing.
  • To identify specific developmental processes dependent on miRNAs.

Main Methods:

  • Generation and analysis of maternal-zygotic dicer (MZdicer) zebrafish mutants.
  • Assessment of miRNA processing and gene silencing in mutant embryos.
  • Rescue experiments involving injection of precursor miRNAs and specific mature miRNAs (e.g., miR-430).
  • Morphological and developmental analysis of MZdicer mutants.

Main Results:

  • MZdicer mutants are unable to process precursor miRNAs into mature miRNAs.
  • Disrupted Dicer domains are dispensable for later stages of miRNA silencing.
  • Mutant embryos exhibit severe defects in morphogenesis, including brain, somite, and heart development.
  • Injection of miR-430 miRNAs rescues brain developmental defects in MZdicer mutants.

Conclusions:

  • Dicer's ribonuclease III and double-stranded RNA-binding domains are essential for miRNA processing but not necessarily for all downstream silencing steps.
  • MicroRNAs, particularly miR-430, play critical and essential roles in zebrafish morphogenesis.
  • This study provides a valuable genetic tool (MZdicer mutants) for dissecting miRNA functions in vivo.