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Novel CASK mutations in cases with syndromic microcephaly

Francesca Cristofoli1, Koen Devriendt2, Erica E Davis3

  • 1Laboratory for Cytogenetics and Genome Research, Center for Human Genetics, KU Leuven, Leuven, Belgium.

Human Mutation
|April 26, 2018
PubMed

Insights

Novel CASK gene mutations cause microcephaly (MC) and intellectual disability. A zebrafish model confirmed these mutations lead to loss-of-function, impacting brain development and recapitulating MC phenotypes.

Area of Science:

  • Genetics
  • Neuroscience
  • Developmental Biology

Background:

  • Mutations in the CASK gene are linked to a range of neurodevelopmental disorders, including X-linked intellectual disability and microcephaly (MC) with pontocerebellar hypoplasia.
  • Predicting the pathogenicity and phenotypic outcomes of new CASK mutations solely based on genetic data is challenging.

Purpose of the Study:

  • To investigate the functional consequences of novel CASK mutations identified in individuals with syndromic MC.
  • To establish and validate a zebrafish model for assessing the impact of CASK variants on brain development.

Main Methods:

  • Whole exome sequencing was used to identify four novel CASK mutations in patients with syndromic MC.
  • A transient loss-of-function zebrafish model was created to study the effects of these mutations.
  • In vivo complementation studies were performed to confirm the functional impact of the mutations.

Main Results:

  • The zebrafish model successfully recapitulated key neuroanatomical phenotypes associated with MC.
  • In vivo complementation studies demonstrated that three of the identified point mutations result in a loss-of-function effect.
  • The study identified four novel CASK mutations associated with syndromic MC.

Conclusions:

  • Zebrafish serve as an effective and rapid model system for evaluating the functional effects of novel CASK variants on brain development.
  • The findings provide insights into the pathogenicity of CASK mutations and their role in microcephaly and related disorders.
Keywords:
CASKcerebellar defectsloss-of-functionmicrocephalyzebrafish

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