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Related Concept Videos

In-vitro Mutagenesis01:16

In-vitro Mutagenesis

To learn more about the function of a gene, researchers can observe what happens when the gene is inactivated or “knocked out,” by creating genetically engineered knockout animals. Knockout mice have been particularly useful as models for human diseases such as cancer, Parkinson’s disease, and diabetes.
CRISPR01:59

CRISPR

Genome editing technologies allow scientists to modify an organism’s DNA via the addition, removal, or rearrangement of genetic material at specific genomic locations. These types of techniques could potentially be used to cure genetic disorders such as hemophilia and sickle cell anemia. One popular and widely used DNA-editing research tool that could lead to safe and effective cures for genetic disorders is the CRISPR-Cas9 system. CRISPR-Cas9 stands for Clustered Regularly Interspaced Short...

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Updated: May 14, 2026

CRISPR/Cas9 Editing of the C. elegans rbm-3.2 Gene using the dpy-10 Co-CRISPR Screening Marker and Assembled Ribonucleoprotein Complexes.
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Published on: December 11, 2020

Successful In Vitro Modification of the Dmd Gene Using Prime Editing.

Ayesha Siddika1,2, Fatima El Husseiny1,2, Joël Rousseau2

  • 1Département de Médecine Moléculaire, Université Laval, Quebec City, QC G1V 0A6, Canada.

Cells
|May 13, 2026
PubMed
Summary
This summary is machine-generated.

Prime editing shows promise for Duchenne muscular dystrophy (DMD). Optimizing guide RNA sequences, specifically removing a TTCT motif, significantly improved editing efficiency in mouse cells, paving the way for precise genetic correction strategies.

Keywords:
CRISPR/Cas9Dmd geneDuchenne muscular dystrophyRTT–PBS optimizationgenome editingmyogenic cellspoint mutationprime editing

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biotechnology

Background:

  • Duchenne muscular dystrophy (DMD) is a severe X-linked genetic disorder caused by mutations in the dystrophin gene.
  • Prime editing offers a precise method for correcting point mutations without inducing double-strand DNA breaks, a key advantage for therapeutic development.

Purpose of the Study:

  • To investigate the efficacy of prime editing for correcting DMD-equivalent mutations in vitro.
  • To identify sequence-specific factors influencing prime editing efficiency in engineered guide RNAs.

Main Methods:

  • Application of prime editing technology to mouse C2C12 myoblasts containing mdx-4cv and mdx-5cv mutation-equivalent sites.
  • Systematic analysis of engineered prime editing guide RNA (epegRNA) sequences, focusing on the impact of a 5'-TTCT-3' motif.
  • Rational redesign of epegRNAs to optimize editing efficiency.

Main Results:

  • Initial prime editing efficiencies were low, correlated with the presence of a 5'-TTCT-3' motif in epegRNAs.
  • Eliminating the TTCT motif through silent substitution significantly enhanced editing outcomes.
  • Redesigned epegRNAs achieved up to 21% modification efficiency at target Dmd mutation sites.

Conclusions:

  • Specific sequence motifs within epegRNAs can critically impact prime editing performance.
  • Rational design of epegRNAs, by removing detrimental motifs, can substantially improve editing efficiency for targeting Dmd mutations.
  • These findings provide crucial insights for optimizing prime editing strategies for genetic disorders like DMD.