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Tissue-specific transcription factors contribute to diverse cellular functions in mammals. For example, the gene for beta globin, a major component of hemoglobin, is present in all cells of the body. However, it is only expressed in red blood cells because the transcription factors that can bind to the promoter sequences of the beta globin gene are only expressed in these cells. Tissue-specific transcription factors also ensure that mutations in these factors may impair only the function of...
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Cis-regulatory sequences are short fragments of non-coding DNA that are present on the same chromosomes as the genes that they regulate. These fragments serve as binding sites for transcriptional regulators, proteins that are responsible for controlling gene transcription and differential gene expression across cell types in eukaryotes. Cis-regulatory sequences can be close to the gene of interest or thousands of bases away in the DNA sequence; however, those sequences that are further away are...
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Genetic screens are tools used to identify genes and mutations responsible for phenotypes of interest. Genetic screens help identify individuals or a group of people at risk of developing  genetic diseases and help them with early intervention, targeted therapy, and reproductive options.
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The flow of genetic information in cells from DNA to mRNA to protein is described by the central dogma, which states that genes specify the sequence of mRNAs, which in turn specify the sequence of amino acids making up all proteins. The decoding of one molecule to another is performed by specific proteins and RNAs. Because the information stored in DNA is so central to cellular function, it makes intuitive sense that the cell would make mRNA copies of this information for protein synthesis...
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Related Experiment Video

Updated: Jun 9, 2025

High Resolution Whole Mount In Situ Hybridization within Zebrafish Embryos to Study Gene Expression and Function
10:06

High Resolution Whole Mount In Situ Hybridization within Zebrafish Embryos to Study Gene Expression and Function

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Codon optimality influences homeostatic gene expression in zebrafish.

Michelle L DeVore1, Ariel A Bazzini1,2

  • 1Stowers Institute for Medical Research, 1000 E 50th Street, Kansas City, MO 64110, USA.

G3 (Bethesda, Md.)
|October 24, 2024
PubMed
Summary
This summary is machine-generated.

Codon optimality, the regulatory impact of specific sequences on mRNA stability, significantly influences gene expression in zebrafish. This study confirms codon content affects mRNA and protein levels in vivo, advancing our understanding of gene regulation.

Keywords:
codon optimalitygene regulationhomeostasismRNAtranslationzebrafish

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Area of Science:

  • Molecular Biology
  • Genetics
  • Developmental Biology

Background:

  • The genetic code specifies amino acids during protein translation by ribosomes.
  • Codons, three-nucleotide sequences, possess regulatory functions influencing mRNA stability, a phenomenon termed codon optimality.
  • Previous research indicated codon optimality affects mRNA stability in human cell lines and during vertebrate embryogenesis.

Purpose of the Study:

  • To investigate the in vivo impact of codon optimality on gene expression in whole zebrafish under physiological conditions.
  • To determine if codon composition influences homeostatic mRNA and protein levels in a whole organism.
  • To expand on previous findings regarding codon optimality's role in mRNA stability.

Main Methods:

  • Utilized reporter constructs with nearly identical nucleotide sequences but varying codon compositions.
  • Ensured all reporter constructs were expressed from the same genomic locus for controlled comparison.
  • Assessed the influence of codon composition on gene expression levels in zebrafish.

Main Results:

  • Demonstrated a robust effect of codon optimality on homeostatic mRNA and protein levels in zebrafish.
  • Showed that codon composition significantly influences gene expression, even with highly similar nucleotide sequences.
  • Confirmed codon optimality is a key regulatory factor in vivo for vertebrates.

Conclusions:

  • Codon optimality plays a significant regulatory role in vertebrate gene expression in vivo.
  • Understanding codon usage is crucial for genetic and translational research, impacting synthetic gene design and therapeutics.
  • This study highlights the importance of codon composition in regulating gene expression and mRNA stability.