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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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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.
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Determination01:51

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During embryogenesis, cells become progressively committed to different fates through a two-step process: specification followed by determination. Specification is demonstrated by removing a segment of an early embryo, “neutrally” culturing the tissue in vitro—for example, in a petri dish with simple medium—and then observing the derivatives. If the cultured region gives rise to cell types that it would normally generate in the embryo, this means that it is specified. In...
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How does a complex organism such as a human develop from a single cell? It all starts from a single fertilized egg which gives rise to a vast array of cell types, such as nerve cells, muscle cells, and epithelial cells that characterize the adult? Throughout development and adulthood, cellular differentiation leads cells to assume their final morphology and physiology. Differentiation is the process by which unspecialized cells become specialized to carry out distinct functions.
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iPS Cell Differentiation01:22

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The ability of induced pluripotent stem cells or iPSCs to differentiate into most body cell types has stimulated repair and regenerative medicine research over the past few decades. iPSC-derived blood cells, hepatocytes, beta islet cells, cardiomyocytes, neurons, and other cell types can repair injuries or regenerate damaged tissue in diseases such as diabetes and neurodegenerative disorders.
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Derivation of Adult Human Fibroblasts and their Direct Conversion into Expandable Neural Progenitor Cells
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La disección de tipos de células diseñadas y la mejora de la conversión del destino celular a través de CellNet.

Samantha A Morris1, Patrick Cahan1, Hu Li2

  • 1Stem Cell Transplantation Program, Division of Pediatric Hematology and Oncology, Manton Center for Orphan Disease Research, Howard Hughes Medical Institute, Boston Children's Hospital and Dana Farber Cancer Institute, Boston, MA 02115, USA; Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Boston, MA 02115, USA; Harvard Stem Cell Institute, Cambridge, MA 02138, USA.

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CellNet, una plataforma de biología en red, mejora el desarrollo de células diseñadas para la medicina regenerativa mediante la identificación y corrección de errores de regulación genética. Esta tecnología mejora la conversión celular y revela nuevos potenciales terapéuticos para las células diseñadas.

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Área de la Ciencia:

  • La reprogramación celular y la medicina regenerativa.
  • Biología de la red y redes de regulación génica.
  • Biotecnología y bioingeniería.

Sus antecedentes:

  • Los protocolos actuales de ingeniería celular a menudo no logran replicar las características de las células diana, lo que limita las aplicaciones en medicina regenerativa.
  • Recapitular fielmente la identidad y función celular in vitro sigue siendo un desafío significativo.
  • La comprensión de las redes reguladoras de genes es crucial para el éxito de la ingeniería celular.

Objetivo del estudio:

  • Introducir CellNet, una plataforma de biología en red para evaluar y mejorar las células diseñadas.
  • Para diagnosticar redes de regulación genética aberrantes en células diseñadas.
  • Identificar los reguladores de la transcripción para mejorar las conversiones celulares.

Principales métodos:

  • Desarrollo y aplicación de la plataforma CellNet.
  • Análisis de las redes reguladoras de genes que rigen la identidad celular.
  • Validación experimental de los reguladores previstos en los protocolos de conversión celular (por ejemplo, las células B a los macrófagos, los fibroblastos a los hepatocitos).

Principales resultados:

  • CellNet mejoró con éxito la eficiencia de la conversión de células B a macrófagos, tanto desde el punto de vista transcripcional como funcional.
  • CellNet identificó un programa intestinal inesperado en los fibroblastos convertidos en hepatocitos inducidos (iHeps), regulados por Cdx2.2.
  • Los hepatocitos inducidos demostraron un injerto funcional a largo plazo en el colon del ratón, lo que indica un potencial como progenitores del endodermo.

Conclusiones:

  • CellNet es una herramienta valiosa para mejorar la conversión celular directa y garantizar la fidelidad de las células diseñadas.
  • La plataforma puede descubrir propiedades no apreciadas previamente y aplicaciones potenciales de células de ingeniería.
  • Este trabajo avanza en el campo de la medicina regenerativa al proporcionar un método para mejorar la ingeniería celular y descubrir nuevas funcionalidades celulares.