Modeling a genetic risk for schizophrenia in iPSCs and mice reveals neural stem cell deficits associated with adherens junctions and polarity

Cell Stem Cell. 2014 Jul 3;15(1):79-91. doi: 10.1016/j.stem.2014.05.003.

Abstract

Defects in brain development are believed to contribute toward the onset of neuropsychiatric disorders, but identifying specific underlying mechanisms has proven difficult. Here, we took a multifaceted approach to investigate why 15q11.2 copy number variants are prominent risk factors for schizophrenia and autism. First, we show that human iPSC-derived neural progenitors carrying 15q11.2 microdeletion exhibit deficits in adherens junctions and apical polarity. This results from haploinsufficiency of CYFIP1, a gene within 15q11.2 that encodes a subunit of the WAVE complex, which regulates cytoskeletal dynamics. In developing mouse cortex, deficiency in CYFIP1 and WAVE signaling similarly affects radial glial cells, leading to their ectopic localization outside of the ventricular zone. Finally, targeted human genetic association analyses revealed an epistatic interaction between CYFIP1 and WAVE signaling mediator ACTR2 and risk for schizophrenia. Our findings provide insight into how CYFIP1 regulates neural stem cell function and may contribute to the susceptibility of neuropsychiatric disorders.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Actin-Related Protein 2 / metabolism
  • Adaptor Proteins, Signal Transducing / genetics
  • Adherens Junctions / genetics*
  • Adherens Junctions / pathology
  • Adult
  • Animals
  • Autistic Disorder / genetics
  • Autistic Disorder / metabolism*
  • Autistic Disorder / pathology
  • Cell Line
  • Cell Polarity / genetics
  • Chromosome Aberrations
  • Chromosomes, Human, Pair 15 / genetics
  • DNA Copy Number Variations
  • Epistasis, Genetic
  • European Continental Ancestry Group
  • Genetic Association Studies
  • Haploinsufficiency
  • Humans
  • Induced Pluripotent Stem Cells / physiology*
  • Intellectual Disability / genetics
  • Male
  • Mice
  • Mice, Inbred Strains
  • Middle Aged
  • Neural Stem Cells / physiology*
  • Risk
  • Schizophrenia / genetics
  • Schizophrenia / metabolism*
  • Schizophrenia / pathology
  • Wiskott-Aldrich Syndrome Protein Family / metabolism

Substances

  • Actin-Related Protein 2
  • Adaptor Proteins, Signal Transducing
  • CYFIP1 protein, human
  • WASF1 protein, human
  • Wiskott-Aldrich Syndrome Protein Family

Supplementary concepts

  • Duplication 15q11-q13 Syndrome