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Maintenance of the ES Cell State01:14

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The cells of the blastocyst inner cell mass only remain pluripotent for a short time. This state of pluripotency and self-renewal can be maintained in embryonic stem (ES) cell culture by adding specific chemicals or growth factors to ensure the cells can continue dividing and later differentiate into different cell types. In some cases, the cells are grown on a feeder layer of differentiated cells, which provides the growth factors and extracellular matrix components necessary for stem cell...
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Oct4GiP Reporter Assay to Study Genes that Regulate Mouse Embryonic Stem Cell Maintenance and Self-renewal
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The epigenome in pluripotency and differentiation.

Rathi D Thiagarajan1, Robert Morey, Louise C Laurent

  • 11 Department of Reproductive Medicine, The University of California, San Diego, La Jolla, CA, USA.

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Pluripotent stem cells are valuable for studying cell development, but epigenetic variations can limit their use as in vitro models. This review examines DNA methylation and histone modifications in pluripotency and differentiation.

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Area of Science:

  • Stem cell biology
  • Epigenetics
  • Developmental biology

Background:

  • Culturing pluripotent stem cells (PSCs) and directing their differentiation offers a powerful system for studying pluripotency, development, and cellular differentiation.
  • High-throughput transcriptomic and epigenomic profiling of PSCs and their derivatives has identified cell-type-specific patterns and novel regulatory elements.
  • Epigenetic variability and instability in PSCs, particularly at imprinted and X-inactivated loci, present limitations for their use as in vitro developmental models.

Purpose of the Study:

  • To review the roles of DNA methylation and histone modifications in the context of pluripotency and differentiation.
  • To highlight the insights gained from high-throughput profiling of PSCs and their derivatives.
  • To discuss the limitations of PSCs as in vitro models due to epigenetic variability and instability.

Main Methods:

  • Review of existing literature on pluripotent stem cells, differentiation, and epigenetics.
  • Analysis of high-throughput transcriptomic and epigenomic data.
  • Focus on DNA methylation and histone modifications as key epigenetic mechanisms.

Main Results:

  • Identification of cell-type-specific epigenetic patterns in PSCs and differentiated cells.
  • Discovery of new regulatory features within the epigenome.
  • Insights into the complex interactions among regulatory elements during differentiation.
  • Characterization of epigenetic variability and instability in PSCs.

Conclusions:

  • Pluripotent stem cells are essential tools for modeling development and differentiation.
  • Epigenetic mechanisms, including DNA methylation and histone modifications, are critical regulators of pluripotency and differentiation.
  • Epigenetic variability and instability in PSCs necessitate careful consideration when using them as in vitro models.