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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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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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Sequential regulatory loops as key gatekeepers for neuronal reprogramming in human cells.

Yuanchao Xue1,2, Hao Qian2, Jing Hu2

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Directly converting human adult fibroblasts into functional neurons requires overcoming two key barriers. Sequential inactivation of PTB and nPTB proteins unlocks neuronal reprogramming and maturation pathways.

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Area of Science:

  • Cellular reprogramming
  • Regenerative medicine
  • Neuroscience

Background:

  • Direct conversion of somatic cells to neurons is crucial for regenerative medicine.
  • Neuronal conversion is less efficient in human cells than in mouse cells, with key barriers unclear.
  • Previous studies identified a PTB-mediated RNA program for converting mouse cells into neurons.

Purpose of the Study:

  • To investigate the barriers to efficient neuronal reprogramming in human adult fibroblasts (HAFs).
  • To identify molecular mechanisms controlling neuronal maturation in human cells.
  • To enable deterministic reprogramming of HAFs into functional neurons.

Main Methods:

  • Utilized a PTB-REST-miR-124 loop in HAFs.
  • Investigated the role of PTB paralog nPTB in neuronal maturation.
  • Analyzed a novel self-enforcing loop involving nPTB, BRN2, and miR-9.

Main Results:

  • The PTB-REST-miR-124 loop generated only immature neurons in HAFs.
  • Sequential inactivation of PTB and nPTB was necessary for functional neuronal conversion.
  • Inactivation of nPTB initiated a new loop crucial for neuronal maturation.

Conclusions:

  • Two distinct gatekeepers control neuronal conversion and maturation in human cells.
  • Overcoming these gatekeepers sequentially enables deterministic reprogramming of HAFs into functional neurons.
  • Findings provide a new strategy for advancing regenerative medicine through cell reprogramming.