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Trisomy correction in Down syndrome induced pluripotent stem cells

Li B Li1, Kai-Hsin Chang, Pei-Rong Wang

  • 1Department of Medicine, University of Washington, Seattle, WA 98195, USA.

Cell Stem Cell
|October 23, 2012
PubMed

Insights

Researchers successfully removed a chromosome to correct Down syndrome (DS) in lab-grown cells. This targeted trisomy removal offers potential for future clinical and research applications in genetic disorders.

Area of Science:

  • Genetics
  • Stem Cell Biology
  • Developmental Biology

Background:

  • Human trisomies, such as Down syndrome (DS), lead to altered cellular phenotypes and congenital abnormalities.
  • Induced pluripotent stem cells (iPSCs) are valuable tools for studying genetic disorders in vitro.

Purpose of the Study:

  • To develop a method for targeted removal of an extra chromosome in human cells.
  • To investigate the cellular and developmental consequences of trisomy correction.

Main Methods:

  • Generated iPSCs from Down syndrome fibroblasts.
  • Introduced a TKNEO transgene into chromosome 21 for gene targeting.
  • Selected for cells that lost the transgene, primarily through chromosome loss.

Main Results:

  • Spontaneous chromosome loss was the predominant mechanism (~10^-4 frequency) for inactivating the TKNEO transgene.
  • Other inactivation mechanisms like point mutations, epigenetic silencing, and TKNEO deletions occurred at lower frequencies.
  • Derived disomic cells exhibited enhanced proliferation and in vivo endothelial production compared to isogenic trisomic cells.
  • In vitro hematopoietic differentiation was not consistently altered.

Conclusions:

  • Successfully demonstrated targeted removal of human trisomy 21 using gene targeting and selection.
  • Disomic cells show improved proliferative and endothelial-forming capabilities.
  • This approach holds promise for both clinical and research applications in understanding and potentially treating trisomic conditions.

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