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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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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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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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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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The process of chromosome duplication during cell division requires genome-wide disruption and re-assembly of chromatin. The chromatin structure must be accurately inherited, reassembled, and maintained in the daughter cells to ensure lineage propagation.
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Epigenetics is the study of inherited changes in a cell's phenotype without changing the DNA sequences. It provides a form of memory for the differential gene expression pattern to maintain cell lineage, position-effect variegation, dosage compensation, and maintenance of chromatin structures such as telomeres and centromeres. For example, the structure and location of the centromere on chromosomes are epigenetically inherited. Its functionality is not dictated or ensured by the underlying...
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Chromatin dynamics during cellular reprogramming.

Effie Apostolou1, Konrad Hochedlinger

  • 11] Massachusetts General Hospital Center for Regenerative Medicine, 185 Cambridge Street, Boston, Massachusetts 02114, USA. [2] Harvard Stem Cell Institute, 1350 Masschusetts Avenue, Cambridge, Massachusetts 02138, USA. [3] Howard Hughes Medical Institute, 4000 Jones Bridge Road, Chevy Chase, Maryland 20815, USA. [4] Department of Stem Cell and Regenerative Biology, Harvard University and Harvard Medical School, 7 Divinity Avenue, Cambridge, Massachusetts 02138, USA.

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Summary
This summary is machine-generated.

Induced pluripotency generates patient-specific stem cells and reveals insights into transcription factors and chromatin structure. Studying these dynamics may advance regenerative medicine and cancer therapies.

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Area of Science:

  • * Stem cell biology and epigenetics.
  • * Molecular mechanisms of cell fate determination.

Background:

  • * Induced pluripotency (iPSC) technology enables patient-specific stem cell generation.
  • * iPSC technology offers a model to study transcription factor-chromatin interactions.
  • * Understanding chromatin dynamics is crucial for cell state transitions.

Purpose of the Study:

  • * To review recent advances in chromatin dynamics during induced pluripotency.
  • * To compare iPSC chromatin events with germ cell maturation and tumorigenesis.
  • * To explore potential applications in regenerative medicine and cancer treatment.

Main Methods:

  • * Review of current literature on induced pluripotency and chromatin dynamics.
  • * Comparative analysis of chromatin remodeling in iPSCs, germ cells, and tumors.
  • * Synthesis of findings to propose integrated mechanistic insights.

Main Results:

  • * Chromatin undergoes significant dynamic changes during the induction of pluripotency.
  • * Similarities exist in chromatin remodeling processes across pluripotency, germ cell development, and cancer.
  • * These dynamic chromatin events are key to regulating cell fate.

Conclusions:

  • * Induced pluripotency provides a valuable framework for studying fundamental cell biology.
  • * An integrated view of chromatin dynamics in diverse processes can yield new therapeutic strategies.
  • * Further research may unlock novel regenerative medicine and cancer treatment approaches.