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Single-nucleus DNA sequencing reveals hidden somatic loss-of-heterozygosity in Cerebral Cavernous Malformations

Andrew K Ressler1, Daniel A Snellings2, Romuald Girard3

  • 1Department of Molecular Genetics and Microbiology, Duke University School of Medicine, Durham, NC, 27710, USA. akr55@duke.edu.

Nature Communications
|November 3, 2023
PubMed

Insights

Researchers developed a novel single-nucleus DNA sequencing method to uncover hidden genetic mutations in Cerebral Cavernous Malformations (CCMs). This approach identifies previously undetected somatic loss-of-heterozygosity, revealing new insights into CCM pathogenesis.

Area of Science:

  • Genetics
  • Neuroscience
  • Oncology

Background:

  • Cerebral Cavernous Malformations (CCMs) are CNS vascular defects causing neurological symptoms.
  • CCMs often involve a three-hit mutational mechanism, including PIK3CA oncogene activation and biallelic CCM gene mutations.
  • Standard sequencing methods frequently miss critical pathogenic mutations in CCMs due to low variant frequency or bulk sequencing limitations.

Purpose of the Study:

  • To develop a sensitive method for identifying hidden mutations in Cerebral Cavernous Malformations.
  • To explore an alternative genetic mechanism driving CCM pathogenesis.
  • To establish a versatile sequencing approach for studying disorders with multiple somatic mutations.

Main Methods:

  • Implemented a single-nucleus DNA sequencing strategy.
  • Leveraged CCM biology to detect somatic loss-of-heterozygosity.
  • Applied advanced sequencing to overcome limitations of bulk short-read approaches.

Main Results:

  • Identified a class of previously hidden mutations in CCM lesions.
  • Uncovered an alternative genetic mechanism contributing to CCM development.
  • Demonstrated the efficacy of single-nucleus sequencing for detecting low-frequency and loss-of-heterozygosity variants.

Conclusions:

  • Single-nucleus DNA sequencing is effective for uncovering complex genetic mutations in CCMs.
  • This method reveals a new pathway in CCM pathogenesis.
  • The developed technique can be applied to investigate other genetic disorders characterized by multiple somatic mutations.

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