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Related Concept Videos

Introduction to Nuclear Reprogramming01:14

Introduction to Nuclear Reprogramming

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Nuclear reprogramming is the process of switching gene expression of one cell type to that of another cell type, usually from a differentiated cell state to an undifferentiated cell state. Differentiation occurs during processes such as development and morphogenesis, tissue regeneration, and malignancy. Cells can also be artificially induced to reprogram their gene expression by techniques such as nuclear transfer, induced pluripotency, and cell fusion. Such techniques have many applications in...
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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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Redox Reactions01:27

Redox Reactions

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Redox reactions are vital biochemical processes that underpin energy metabolism in cells. These reactions involve the transfer of electrons between molecules, occurring in tandem as oxidation and reduction. Oxidation refers to the loss of electrons, while reduction denotes their gain. This coupling ensures the seamless flow of electrons through metabolic pathways. For example, in bacterial metabolism, glucose undergoes oxidation to carbon dioxide, while oxygen is simultaneously reduced to...
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Forced Transdifferentiation01:28

Forced Transdifferentiation

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Transdifferentiation, also known as lineage reprogramming, was first discovered by Selman and Kafatos in 1974 in silkmoths. They observed that the moths’ cuticle-producing cells transformed into salt-producing cells. Many such cases of natural transdifferentiation occur in organisms. In humans, pancreatic alpha cells can become beta cells. In newts, the loss of the eye’s lens causes the pigmented epithelial cells to transdifferentiate into the lens cells.
Artificial...
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Chromatin Modification in iPS Cells01:32

Chromatin Modification in iPS Cells

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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.
Compact chromatin makes reprogramming difficult. Enzymes, such as histone demethylases and acetyltransferases, are often added during reprogramming to loosen the chromatin, making the DNA more accessible to transcription factors. Molecules that inhibit histone...
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Methods of Nuclear Reprogramming01:24

Methods of Nuclear Reprogramming

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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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Related Experiment Video

Updated: Aug 8, 2025

Monitoring On-Target Signaling Responses in Larval Zebrafish - Z-REX Unmasks Precise Mechanisms of Electrophilic Drugs and Metabolites
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Oct4 redox sensitivity potentiates reprogramming and differentiation.

Zuolian Shen, Yifan Wu, Asit Mana

    Biorxiv : the Preprint Server for Biology
    |March 3, 2023
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    Summary
    This summary is machine-generated.

    A key cysteine in Oct4 (Pou5f1) controls pluripotency and reprogramming. Oxidation of this residue regulates Oct4 DNA binding, impacting cell differentiation and development.

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    Area of Science:

    • Stem cell biology
    • Molecular mechanisms of pluripotency
    • Epigenetics and gene regulation

    Background:

    • Oct4 (Pou5f1) is a crucial transcription factor for maintaining pluripotency and reprogramming somatic cells.
    • Understanding Oct4's regulatory mechanisms is key to advancing regenerative medicine and developmental biology.

    Approach:

    • Utilized domain swapping and mutagenesis to investigate Oct4's reprogramming capabilities.
    • Focused on a redox-sensitive cysteine residue (Cys48) within the DNA binding domain.
    • Analyzed the impact of Cys48 mutations on Oct4 function, gene expression, and cellular differentiation in embryonic stem cells (ESCs) and in vivo models.

    Key Points:

    • Identified Oct4 Cys48 as a critical determinant of reprogramming and differentiation.
    • Demonstrated that Cys48 oxidation inhibits Oct4 DNA binding and promotes ubiquitylation.
    • Pou5f1C48S mutation in ESCs leads to impaired differentiation and teratoma formation.
    • Pou5f1C48S (Janky) mice exhibit severe developmental restrictions and sterility.

    Conclusions:

    • Uncovered a novel redox-sensitive mechanism regulating Oct4 function.
    • This mechanism is essential for both the initiation and termination of pluripotency.
    • Findings provide new insights into the dynamic regulation of pluripotency and cellular fate.