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Related Experiment Videos

Protein-truncating mutations in ASPM cause variable reduction in brain size.

Jacquelyn Bond1, Sheila Scott, Daniel J Hampshire

  • 1Molecular Medicine Unit, University of Leeds, St. James's University Hospital, Leeds, United Kingdom. j.bond@leeds.ac.uk

American Journal of Human Genetics
|October 24, 2003
PubMed
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This summary is machine-generated.

Mutations in the ASPM gene are the primary cause of autosomal recessive primary microcephaly (MCPH), a developmental brain disorder. This study identified 19 ASPM gene mutations in 23 families, revealing protein-truncating changes across the gene.

Area of Science:

  • Genetics
  • Developmental Biology
  • Neurology

Background:

  • Autosomal recessive primary microcephaly (MCPH) is a severe congenital condition characterized by reduced brain size and intellectual disability.
  • Mutations in the ASPM gene are strongly implicated as a leading genetic cause of MCPH, particularly at the MCPH5 locus.
  • Understanding ASPM gene mutations is crucial for diagnosing and potentially treating this neurodevelopmental disorder.

Purpose of the Study:

  • To conduct the first comprehensive mutation screen of the entire ASPM gene.
  • To identify and characterize mutations responsible for MCPH in a cohort of consanguineous families.
  • To investigate the relationship between mutation location and phenotypic variability in MCPH patients.

Main Methods:

  • Comprehensive mutation screening of the 10.4-kb ASPM gene.

Related Experiment Videos

  • Analysis of 23 consanguineous families with affected individuals.
  • Genotyping and phenotypic assessment of 51 individuals with MCPH.

    • Main Results:

    • Nineteen distinct mutations were identified within the ASPM gene.
    • All identified mutations were predicted to result in protein truncation.
    • Mutations were distributed throughout the ASPM gene.
    • Phenotypic variation, including the severity of microcephaly and intellectual disability, was observed but did not correlate with mutation position.

    Conclusions:

    • ASPM gene mutations are a frequent cause of autosomal recessive primary microcephaly.
    • The identified mutations are predominantly protein-truncating, affecting ASPM gene function.
    • The degree of microcephaly and intellectual impairment in MCPH patients shows variability independent of the specific mutation site within the ASPM gene.