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Related Experiment Video

Updated: May 22, 2025

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Cardiac-Specific Gene Editing via an AAV9-Tnnt2-SaCas9-miR122TS Vector.

Luzi Yang1, Congting Guo1, Yueshen Sun2

  • 1School of Basic Medical Sciences, Institute of Cardiovascular Sciences, State Key Laboratory of Vascular Homeostasis and Remodeling, Peking University Health Science Center, Beijing, China.

Bio-Protocol
|March 14, 2025
PubMed
Summary
This summary is machine-generated.

This study introduces a novel adeno-associated virus (AAV9) vector that enhances cardiac-specific gene editing. By incorporating microRNA-122 target sequences, it effectively reduces unwanted gene expression in the liver.

Keywords:
Adeno-associated virusCardiac-specificGene editingmicroRNA-122 target sequence

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Area of Science:

  • Molecular Biology
  • Gene Therapy
  • Cardiovascular Research

Background:

  • Adeno-associated virus serotype 9 (AAV9) with the cardiac troponin T (Tnnt2) promoter is typically cardiac-specific.
  • Ectopic AAV9-Tnnt2 expression in the liver can be significant in CRISPR/Cas9 gene editing, impacting results.
  • MicroRNA-122 (miR122) is highly specific to liver tissue.

Purpose of the Study:

  • To develop a novel AAV9 vector for enhanced cardiac-specific gene editing.
  • To mitigate off-target gene editing in the liver by reducing ectopic expression.
  • To provide a detailed protocol for constructing and validating this improved vector.

Main Methods:

  • Design of sgRNA and construction of plasmids for the AAV9-Tnnt2-SaCas9-miR122TS vector.
  • AAV packaging and in vivo validation in a mouse model.
  • Utilizing publicly available materials and tools for vector development and analysis.

Main Results:

  • Successful construction and validation of the AAV9-Tnnt2-SaCas9-miR122TS vector.
  • Demonstrated reduction of ectopic gene expression in the liver due to miR122 target sequences.
  • Precise quantification of cardiac-specific gene editing efficiency using amplicon sequencing.

Conclusions:

  • The developed AAV9 vector with miR122 target sequences achieves robust cardiac-specific gene editing.
  • This approach effectively circumvents liver-based gene expression leakages, improving specificity.
  • The protocol facilitates precise and sensitive evaluation of gene editing efficiency and tissue tropism in vivo.