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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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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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Assessing reprogramming by chimera formation and tetraploid complementation.

Xin Li1, Bao-long Xia, Wei Li

  • 1State Key Laboratory of Reproductive Biology, Institute of Zoology, Chinese Academy of Sciences, 1 Beichen West Road, Chaoyang District, Beijing, 100101, P. R. China.

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This study details methods for assessing stem cell pluripotency using chimera formation and tetraploid complementation. These stringent assays help determine if induced pluripotent stem cells (iPS cells) are functionally equivalent to embryonic stem cells (ESCs).

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Area of Science:

  • Stem cell biology
  • Developmental biology
  • Regenerative medicine

Background:

  • Pluripotent stem cells (PSCs) are crucial for developmental and regenerative studies.
  • Assessing the functional pluripotency of PSCs, especially induced pluripotent stem cells (iPS cells), is challenging.
  • Established methods like marker expression and teratoma formation have limitations in fully evaluating pluripotency.

Purpose of the Study:

  • To present detailed protocols for chimera formation and tetraploid complementation assays.
  • To establish these methods as the most stringent criteria for assessing stem cell pluripotency.
  • To provide a reliable framework for comparing the functional equivalence of different pluripotent stem cell types, including iPS cells and embryonic stem cells (ESCs).

Main Methods:

  • Detailed procedural description of chimera formation using aggregated embryos.
  • Step-by-step protocol for tetraploid complementation assay.
  • Comparative analysis of assessment criteria for stem cell pluripotency.

Main Results:

  • Successful implementation of chimera formation protocols.
  • Demonstration of tetraploid complementation as a highly stringent assay for pluripotency.
  • Establishment of a robust methodology for functional pluripotency assessment.

Conclusions:

  • Chimera formation and tetraploid complementation are the most rigorous methods for evaluating stem cell pluripotency.
  • These assays are essential for confirming the functional equivalence of iPS cells to ESCs.
  • The presented procedures offer a standardized approach for critical pluripotency assessment in stem cell research.