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Assessing the digenic model in rare disorders using population sequencing data.

Nerea Moreno-Ruiz1,2,3, , Oscar Lao2

  • 1Servei de Genòmica, Department of Medicine and Life Sciences, Universitat Pompeu Fabra, Parc de Recerca Biomèdica de Barcelona, Barcelona, Spain.

European Journal of Human Genetics : EJHG
|October 3, 2022
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Summary
This summary is machine-generated.

Many rare disorder patients lack genetic diagnoses. This study introduces a framework to analyze digenic inheritance, where variants in two related genes cause disease, improving diagnosis for undiagnosed rare genetic disorders.

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Area of Science:

  • Genomics
  • Medical Genetics
  • Bioinformatics

Background:

  • A significant portion of rare disorder patients remain undiagnosed after comprehensive genetic sequencing.
  • Current diagnostic approaches primarily focus on monogenic inheritance, overlooking complex genetic interactions.
  • Digenic inheritance, involving variants in two functionally related genes, presents a potential explanation for these undiagnosed cases.

Purpose of the Study:

  • To develop and validate a computational framework for assessing the significance of digenic inheritance patterns in rare disorders.
  • To evaluate the statistical power of this framework across various genetic scenarios.
  • To provide a novel approach for identifying genetic causes in patients with unexplained rare diseases.

Main Methods:

  • Development of a statistical framework to identify and evaluate digenic combinations.
  • Testing the framework's power using simulated and real-world genetic data scenarios.
  • Comparison of digenic variant frequencies between patient cohorts and healthy controls.

Main Results:

  • The developed framework can statistically evaluate the significance of digenic combinations.
  • The approach demonstrates potential in identifying disease-causing digenic variants.
  • Digenic combinations implicated in rare disorders are expected to be underrepresented in healthy populations.

Conclusions:

  • Digenic inheritance is a plausible and significant etiological model for a fraction of rare genetic disorders.
  • The proposed framework offers a powerful tool for uncovering complex genetic bases of diseases.
  • This approach will be increasingly relevant with large-scale sequencing initiatives.