Cited by 116Microtubule and mitosis dynamicsGenomics and Rare DiseasesGenetics and Neurodevelopmental Disorders

Kinetochore KMN network gene CASC5 mutated in primary microcephaly

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Genin, A., Desir, J., Lambert, N., Biervliet, M., Van Der Aa, N., Pierquin, G., Killian, A., Tosi, M. +5 more·2012·Human Molecular Genetics

Abstract

Several genes expressed at the centrosome or spindle pole have been reported to underlie autosomal recessive primary microcephaly (MCPH), a neurodevelopmental disorder consisting of an important brain size reduction present since birth, associated with mild-to-moderate mental handicap and no other neurological feature nor associated malformation. Here, we report a mutation of CASC5 (aka Blinkin, or KNL1, or hSPC105) in MCPH patients from three consanguineous families, in one of which we initially reported the MCPH4 locus. The combined logarithm of odds score of the three families was >6. All patients shared a very rare homozygous mutation of CASC5. The mutation induced skipping of exon 18 with subsequent frameshift and truncation of the predicted protein. CASC5 is part of the KMN network of the kinetochore and is required for proper microtubule attachment to the chromosome centromere and for spindle-assembly checkpoint (SAC) activation during mitosis. Like MCPH gene ASPM, CASC5 is upregulated in the ventricular zone (VZ) of the human fetal brain. CASC5 binds BUB1, BUBR1, ZWINT-1 and interestingly it binds to MIS12 through a protein domain which is truncated by the mutation. CASC5 localized at the equatorial plate like ZWINT-1 and BUBR1, while ASPM, CEP152 and PCTN localized at the spindle poles in our patients and in controls. Comparison of primate and rodent lineages indicates accelerated evolution of CASC5 in the human lineage. Our data provide strong evidence for CASC5 as a novel MCPH gene, and underscore the role of kinetochore integrity in proper volumetric development of the human brain.

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Authors
Genin, A., Desir, J., Lambert, N., Biervliet, M., Van Der Aa, N., Pierquin, G., Killian, A., Tosi, M., Urbina, M., Lefort, A., Libert, F., Pirson, I., & Abramowicz, M.
Affiliations
  • Université Libre de Bruxelles (BE)
  • Antwerp University Hospital (BE)
  • University of Liège (BE)
  • Inserm (FR)
Corresponding author
Pirson, I.
Venue
Human Molecular Genetics
Published
2012-09-13
Volume
21
Issue
24
Pages
5306-5317
ISSN
  • 0964-6906 (ISSN-L)
  • 1460-2083
OpenAlex
W2157294078
Cited by
116
References
43
Citations by year
2026: 1 · 2025: 4 · 2024: 2 · 2023: 7 · 2022: 4 · 2021: 10 · 2020: 9 · 2019: 12 · 2018: 8 · 2017: 14 · 2016: 15 · 2015: 10 · 2014: 12 · 2013: 8
FWCI
4.53
Type
journal article
Language
en
Open access
Locations
  • Human Molecular Genetics (publishedVersion)
  • PubMed (publishedVersion)
  • Dépôt institutionnel de l'Université libre de Bruxelles (Université Libre de Bruxelles) (submittedVersion, other-oa)
  • Open Repository and Bibliography (University of Liège) (submittedVersion)
  • VUBIR (Vrije Universiteit Brussel) (submittedVersion)
Funders
  • Fonds Erasme
  • Fonds De La Recherche Scientifique - FNRS
  • Fonds pour la Formation à la Recherche dans l’Industrie et dans l’Agriculture
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Microtubule and mitosis dynamics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genomics and Rare Diseases
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetics and Neurodevelopmental Disorders
Keywords
primary microcephaly, kinetochore, KMN network, spindle assembly checkpoint, centrosome, ASPM, exon skipping, consanguineous family, brain development, ventricular zone, BUB1, BubR1, protein evolution, neurodevelopmental disorders
MeSH terms
Cell Line, Cells, Cultured, Humans, Microcephaly, Microtubule-Associated Proteins, Mitosis, Mutation, Nerve Tissue Proteins, Nuclear Proteins, Protein Binding, Immunoblotting, Polymerase Chain Reaction, Protein Serine-Threonine Kinases, Kinetochores, Cell Cycle Proteins, Intracellular Signaling Peptides and Proteins

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