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In Vitro Modeling of Down Syndrome Neurogenesis Using Human-Induced Pluripotent Stem Cells
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Elevated Id2 expression results in precocious neural stem cell depletion and abnormal brain development.

Hee Jung Park1, Mingi Hong, Roderick T Bronson

  • 1The Jackson Laboratory, Bar Harbor, Maine, USA.

Stem Cells (Dayton, Ohio)
|February 8, 2013
PubMed
Summary

Elevated Id2 expression in embryonic brains causes microcephaly and seizures by disrupting neural stem cell development. Id2 also modulates the p53 pathway, influencing brain tumor formation.

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Area of Science:

  • Neuroscience
  • Developmental Biology
  • Genetics

Background:

  • Id2 is a helix-loop-helix transcription factor crucial for development.
  • Dysregulated Id2 expression is linked to neurological disorders.
  • The sufficiency of Id2 dysregulation in causing brain abnormalities is unknown.

Purpose of the Study:

  • To investigate if elevated Id2 expression during embryonic development is sufficient to cause neurological defects.
  • To determine the cell-context specificity of Id2's effects on neural stem cells (NSCs).
  • To elucidate the role of Id2 in NSC self-renewal and its interaction with the p53 pathway.

Main Methods:

  • Generation of Id2 transgenic mice with embryonic Id2 overexpression.
  • Analysis of brain development and function in transgenic and knockout models.
  • Investigation of Id2's impact on neural stem cell (NSC) behavior in vivo and in vitro.
  • Functional studies involving p53 deletion in Id2-transgenic brains.

Main Results:

  • Embryonic Id2 overexpression leads to microcephaly and seizures, particularly in females.
  • Id2's effect on NSCs is cell-context dependent, causing apoptosis in early stages and altered G1 cyclin/p53 expression in later stages.
  • Id2 negatively regulates NSC self-renewal in vivo, contrasting with prior cell culture findings.
  • Deletion of p53 rescues apoptosis but increases brain tumor incidence; Id2 modulates p53-null NSC self-renewal.

Conclusions:

  • Elevated embryonic Id2 expression is sufficient to disrupt normal brain development and function.
  • Id2 dysregulation impacts NSC self-renewal, differentiation, and survival, leading to microcephaly, seizures, and tumors.
  • Id2 interacts with and modulates the p53 pathway in neural stem cells.