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Stem cells are undifferentiated cells that divide and produce different types of cells. Ordinarily, cells that have differentiated into a specific cell type are post-mitotic—that is, they no longer divide. However, scientists have found a way to reprogram these mature cells so that they “de-differentiate” and return to an unspecialized, proliferative state. These cells are also pluripotent like embryonic stem cells—able to produce all cell types—and are therefore...
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RNA editing is a post-transcriptional modification where a precursor mRNA (pre-mRNA) nucleotide sequence is changed by base insertion, deletion, or modification. The extent of RNA editing varies from a few hundred bases, in mitochondrial DNA of trypanosomes, to a just single base, in nuclear genes of mammals. Even a single base change in the pre-mRNA can convert a codon for one amino acid into the codon for another amino acid or a stop codon. This type of re-coding can significantly affect the...
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Introducing Point Mutations into Human Pluripotent Stem Cells Using Seamless Genome Editing
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Toward a Universal Solution: Editing Compatibility into Pluripotent Stem Cells.

Alan Trounson1, Nicholas R Boyd1, Richard L Boyd1

  • 1Hudson Institute of Medical Research, Monash University, Clayton, VIC, Australia; Cartherics Pty. Ltd., Clayton, VIC, Australia.

Cell Stem Cell
|April 6, 2019
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Summary
This summary is machine-generated.

Editing induced pluripotent stem cells (iPSCs) to remove major histocompatibility antigens could create universal stem cell lines. However, this may trigger minor histocompatibility responses and impair T-cell immunity against infections and cancer.

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Area of Science:

  • Stem cell biology
  • Immunology
  • Gene editing

Background:

  • Induced pluripotent stem cells (iPSCs) hold promise for regenerative medicine.
  • Histocompatibility antigens are key determinants of immune compatibility.
  • Current stem cell therapies face challenges with immune rejection.

Purpose of the Study:

  • To investigate the potential of editing iPSCs' major histocompatibility antigens.
  • To assess the feasibility of creating universally compatible stem cell lines for therapy.
  • To identify potential immunological risks associated with such modifications.

Main Methods:

  • Gene editing techniques were applied to iPSCs.
  • Major histocompatibility antigen expression was analyzed.
  • Potential T-cell responses to modified iPSCs were evaluated.

Main Results:

  • Editing major histocompatibility antigens on iPSCs is demonstrated.
  • This modification could lead to a limited set of universally compatible stem cell lines.
  • Potential for minor histocompatibility responses in patients was identified.
  • Deficiencies in T-cell repertoire against infection and cancer may occur.

Conclusions:

  • iPSC antigen editing offers a potential strategy for universal stem cell therapies.
  • Careful consideration of minor histocompatibility responses and T-cell function is crucial.
  • Further research is needed to balance therapeutic potential with immunological safety.