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Somatic to iPS Cell Reprogramming01:29

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Reprogramming alters the gene expression in somatic cells, transforming them into induced pluripotent stem (iPS) cells over several generations. Scientists can reprogram cells by introducing genes for four transcription factors—Oct4, Sox2, Klf4, and c-Myc (OSKM) by viral or non-viral methods. These factors are also known as Yamanaka factors after Shinya Yamanaka, who first generated iPS cells using mouse skin cells. Yamanaka was awarded the Nobel Prize in Physiology or Medicine in 2012...
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Methods of Nuclear Reprogramming01:24

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Nuclear reprogramming is a process of transforming one cell type into an unrelated cell type by epigenetic changes that alter the cell’s original gene expression pattern. Such epigenetic changes force cells to express a different set of genes, which play a significant role in inducing transformation into other cell types. Nuclear reprogramming offers applications in reproductive cloning for livestock propagation and regenerative medicine — developing patient-specific cells for...
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Stem cells are undifferentiated cells that divide and produce different types of cells. Ordinarily, cells that have differentiated into a specific cell type are post-mitotic—that is, they no longer divide. However, scientists have found a way to reprogram these mature cells so that they “de-differentiate” and return to an unspecialized, proliferative state. These cells are also pluripotent like embryonic stem cells—able to produce all cell types—and are therefore...
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Induced Pluripotent Stem Cells01:06

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Stem cells are undifferentiated cells that divide and produce different cell types. Ordinarily, cells that have differentiated into a specific cell type are terminally differentiated; however, scientists have found a way to reprogram these mature cells so that they dedifferentiate and return to an unspecialized, proliferative state. These cells are pluripotent like embryonic stem cells—able to produce all cell types—and are called induced pluripotent stem cells (iPSCs).
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Chromatin Modification in iPS Cells01:32

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Chromatin modification alters gene expression; therefore, scientists can add histone-modifying enzymes, histone variants, and chromatin remodeling complexes to somatic cells to aid reprogramming into pluripotent stem (iPS) cells.
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Combinatorial Gene Control02:33

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Combinatorial gene control is the synergistic action of several transcriptional factors to regulate the expression of a single gene. The absence of one or more of these factors may lead to a significant difference in the level of gene expression or repression.
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Related Experiment Video

Updated: May 2, 2026

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Vectorology and factor delivery in induced pluripotent stem cell reprogramming.

Kejin Hu1

  • 1Department of Biochemistry and Molecular Genetics, UAB Stem Cell Institute, School of Medicine, University of Alabama at Birmingham , Birmingham, Alabama.

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|March 15, 2014
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Summary

Induced pluripotent stem cell (iPSC) reprogramming needs specific factors for 10-30 days. This review explores advanced vector technologies overcoming limitations of older retroviral methods for safer, efficient iPSC generation.

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Generation of Integration-free Induced Pluripotent Stem Cells from Human Peripheral Blood Mononuclear Cells Using Episomal Vectors
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Area of Science:

  • Stem cell biology
  • Molecular biology
  • Biotechnology

Background:

  • Induced pluripotent stem cell (iPSC) reprogramming demands sustained expression of reprogramming factors for 10-30 days.
  • Conventional methods using lentiviral or simple retroviral vectors present significant drawbacks, including insertional mutagenesis, gene silencing, and immunogenicity.

Purpose of the Study:

  • To review and summarize emerging vector technologies and factor delivery systems for iPSC reprogramming.
  • To highlight advancements that overcome the limitations of traditional retroviral reprogramming methods.

Main Methods:

  • Exploration of various advanced reprogramming technologies.
  • Summarization of vectorologies and factor delivery systems.
  • Analysis of methods including adenoviral vectors, protein transduction, RNA transfection, minicircle DNA, and others.

Main Results:

  • Identified limitations of retroviral reprogramming: insertional mutagenesis, silencing, residual expression, and immunogenicity.
  • Detailed various alternative technologies: adenoviral vectors, protein transduction, RNA, minicircle DNA, PiggyBac transposon, Cre-lox, RNA replicons, and episomal plasmids.

Conclusions:

  • Advanced vector technologies offer improved safety and efficiency for iPSC reprogramming.
  • The reviewed methods provide alternatives to overcome retroviral limitations, paving the way for clinical applications.