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OLIG2 Drives Abnormal Neurodevelopmental Phenotypes in Human iPSC-Based Organoid and Chimeric Mouse Models of Down

Ranjie Xu1, Andrew T Brawner2, Shenglan Li3

  • 1Department of Cell Biology and Neuroscience, Rutgers University, Piscataway, NJ 08854, USA; Department of Developmental Neuroscience, Munroe-Meyer Institute and Mary & Dick Holland Regenerative Medicine Program, University of Nebraska Medical Center, Omaha, NE 68198, USA.

Cell Stem Cell
|May 28, 2019
PubMed

Insights

Down syndrome (DS) involves neurodevelopmental issues. Researchers found that overproducing OLIG2 in Down syndrome cells leads to more inhibitory neurons, causing memory deficits, but reducing OLIG2 improved these cognitive defects.

Area of Science:

  • Neuroscience
  • Genetics
  • Developmental Biology

Background:

  • Down syndrome (DS) is a genetic disorder associated with cognitive impairments.
  • Imbalances in neurotransmission are implicated in DS-related neurodevelopmental defects.
  • Human induced pluripotent stem cells (hiPSCs) offer a model to study DS pathogenesis.

Purpose of the Study:

  • To investigate the role of OLIG2 in neurodevelopmental abnormalities in Down syndrome.
  • To identify molecular mechanisms linking DS to altered neurotransmission and cognitive deficits.
  • To explore OLIG2 as a potential therapeutic target for DS.

Main Methods:

  • Generation and analysis of hiPSCs from DS patients.
  • Differentiation of hiPSCs into neural progenitors and cerebral organoids.
  • Assessment of gene expression, interneuron production, and behavioral deficits in neuronal chimeric mice.
  • shRNA-mediated knockdown of OLIG2.

Main Results:

  • DS hiPSCs overproduce OLIG2+ ventral forebrain neural progenitors.
  • DS organoids exhibit excessive GABAergic interneuron production.
  • Increased OLIG2 directly upregulates interneuron transcription factors.
  • OLIG2 knockdown in DS models reverses gene expression, reduces interneuron overproduction, and improves recognition memory in chimeric mice.

Conclusions:

  • Altered OLIG2 expression is a key factor in DS-related neurodevelopmental abnormalities.
  • Overproduction of OLIG2 contributes to excessive interneuron generation and cognitive deficits in DS.
  • Targeting OLIG2 presents a potential therapeutic strategy for improving cognitive function in Down syndrome.
Keywords:
Down syndromeOLIG1OLIG2brain organoidchimeric mouse brainhuman induced pluripotent stem cellinterneuronneurodevelopmental disorder

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