Cited by 46Microtubule and mitosis dynamicsNeurogenesis and neuroplasticity mechanismsGenetics and Neurodevelopmental Disorders

Microcephaly Modeling of Kinetochore Mutation Reveals a Brain-Specific Phenotype

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Omer Javed, Attya, Li, Yun, Muffat, Julien, Su, Kuan-Chung, Cohen, Malkiel A., Lungjangwa, Tenzin, Aubourg, Patrick, Cheeseman, Iain M. +1 more·2018·Cell Reports

Abstract

Most genes mutated in microcephaly patients are expressed ubiquitously, and yet the brain is the only major organ compromised in most patients. Why the phenotype remains brain specific is poorly understood. In this study, we used in vitro differentiation of human embryonic stem cells to monitor the effect of a point mutation in kinetochore null protein 1 (KNL1; CASC5), identified in microcephaly patients, during in vitro brain development. We found that neural progenitors bearing a patient mutation showed reduced KNL1 levels, aneuploidy, and an abrogated spindle assembly checkpoint. By contrast, no reduction of KNL1 levels or abnormalities was observed in fibroblasts and neural crest cells. We established that the KNL1 patient mutation generates an exonic splicing silencer site, which mainly affects neural progenitors because of their higher levels of splicing proteins. Our results provide insight into the brain-specific phenomenon, consistent with microcephaly being the only major phenotype of patients bearing KNL1 mutation.

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Crossref · 10.1016/j.celrep.2018.09.032

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  • Protein-coding changes in cell cycle-related genes are highly relevant candidates for human-specific traits, with the brain being specifically sensitive to such changes.

    “It has been proposed previously that protein-coding changes in cell cycle-related genes are highly relevant candidates for human-specific traits1,20, with the brain being specifically sensitive to such changes61.”

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Authors
Omer Javed, A., Li, Y., Muffat, J., Su, K.-C., Cohen, M. A., Lungjangwa, T., Aubourg, P., Cheeseman, I. M., & Jaenisch, R.
Affiliations
  • University of Toronto (CA)
  • Whitehead Institute for Biomedical Research (US)
  • Inserm (FR)
Corresponding author
Jaenisch, Rudolf
Venue
Cell Reports
Publisher
Elsevier BV
Published
2018-10
Volume
25
Issue
2
Pages
368-382.e5
ISSN
2211-1247 (ISSN-L)
OpenAlex
W2896687431
Cited by
46
References
43
Citations by year
2026: 4 · 2025: 4 · 2024: 6 · 2023: 5 · 2022: 6 · 2021: 5 · 2020: 11 · 2019: 4 · 2018: 1
FWCI
2.91
Type
journal article
Language
en
Open access
Locations
  • Cell Reports (publishedVersion, cc-by-nc-nd)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion, other-oa)
  • PubMed Central (acceptedVersion, cc-by-nc-nd)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
  • DSpace@MIT (Massachusetts Institute of Technology) (submittedVersion, cc-by-nc-nd)
  • Archivio Istituzionale della Ricerca - Università Vita-Salute San Raffaele (submittedVersion)
Funders
  • Association Européenne contre les Leucodystrophies
  • National Institutes of Health (R37-CA084198, 1U19AI131135-01, HD 045022)
  • International Rett Syndrome Foundation
  • National Alliance for Research on Schizophrenia and Depression
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Microtubule and mitosis dynamics
  • Life Sciences › Neuroscience › Developmental Neuroscience › Neurogenesis and neuroplasticity mechanisms
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetics and Neurodevelopmental Disorders
Keywords
microcephaly, KNL1, point mutations, neural progenitor cells, aneuploidy, spindle assembly checkpoint, exonic splicing silencer, alternative splicing, human embryonic stem cell differentiation, fibroblasts, neural crest cells
MeSH terms
Brain, Cells, Cultured, Humans, Microcephaly, Microtubule-Associated Proteins, Mutation, Phenotype, RNA Splicing, Kinetochores, Embryonic Stem Cells, Neural Stem Cells, M Phase Cell Cycle Checkpoints

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