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Related Experiment Video

Updated: Jan 22, 2026

Generation of Induced Pluripotent Stem Cells from Muscular Dystrophy Patients: Efficient Integration-free Reprogramming of Urine Derived Cells
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Efficient exogenous DNA-free reprogramming with suicide gene vectors.

Minhyung Lee1,2, Jeongmin Ha1,2, Ye Seul Son1,2

  • 1Stem Cell Convergence Research Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB), Daejeon, 34141, Republic of Korea.

Experimental & Molecular Medicine
|July 21, 2019
PubMed
Summary
This summary is machine-generated.

This study introduces a novel method using cytosine deaminase (CD) episomal vectors and 5-fluorocytosine (5-FC) treatment to rapidly generate exogene-free induced pluripotent stem cells (iPSCs) and neural stem cells.

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Area of Science:

  • Stem Cell Biology
  • Molecular Biology
  • Gene Therapy

Background:

  • Episomal vectors offer a safe method for generating induced pluripotent stem cells (iPSCs) without genomic integration.
  • Current methods for removing episomal DNA from iPSCs can be lengthy, exceeding 70 days.
  • Occasional genomic integration of exogenous genes remains a challenge in current reprogramming techniques.

Purpose of the Study:

  • To develop a rapid and efficient method for isolating exogene-free reprogrammed cells.
  • To improve the safety and reduce the time required for generating induced pluripotent stem cells (iPSCs).
  • To create a system for eliminating both episomal vectors and integrated transgenes from reprogrammed cells.

Main Methods:

  • Insertion of the yeast cytosine deaminase (CD) gene into episomal vectors.
  • Reprogramming of human fibroblasts into iPSCs using CD episomal vectors.
  • Treatment of reprogrammed cells with 5-fluorocytosine (5-FC) to eliminate vectors and integrated genes.
  • Direct reprogramming of fibroblasts into induced neural stem cells using CD episomal vectors and 5-FC.

Main Results:

  • CD episomal vectors were efficiently eliminated from iPSCs within seven days of 5-FC treatment.
  • Human fibroblasts were successfully reprogrammed into iPSCs lacking exogenous DNA.
  • Cells with integrated CD genes were eliminated within two days of 5-FC treatment.
  • Exogene-free induced neural stem cells were generated after a single passage.

Conclusions:

  • The novel CD episomal vector system enables rapid and efficient isolation of exogene-free reprogrammed cells.
  • This method significantly reduces the time and improves the safety of generating iPSCs and other reprogrammed cell types.
  • The approach holds promise for applications in disease modeling and clinical settings.