Variant Classification for Pompe disease; ACMG/AMP specifications from the ClinGen Lysosomal Diseases Variant...

Area of Science:

• Genomics and Precision Medicine
• Clinical Genetics
• Biocuration

Background:

• Accurate clinical significance determination of genetic variants is crucial for integrating genomics into healthcare.
• The Clinical Genome Resource (ClinGen) utilizes Variant Curation Expert Panels (VCEPs) to specify gene- and disease-specific guidelines for variant classification.
• Pompe disease diagnosis, carrier identification, and newborn screening interpretation rely on accurate genetic variant classification.

Purpose of the Study:

• To specify the American College of Medical Genetics & Genomics and Association for Molecular Pathology's (ACMG/AMP) criteria for GAA variants in Pompe disease.
• To update GAA-specific variant classification guidelines and compare ClinGen Lysosomal Diseases (LD) VCEP classifications with existing ClinVar data.
• To enhance the public knowledge base on GAA variant pathogenicity and resolve classification discrepancies.

Main Methods:

• Specification of ACMG/AMP criteria tailored for GAA variants by the ClinGen LD VCEP.
• Submission of expert-curated GAA variant classifications and supporting data to public databases (ClinVar, ClinGen Evidence Repository).
• Comparative analysis of LD VCEP's GAA variant classifications against those submitted to ClinVar.

Main Results:

• The LD VCEP has submitted classifications for 243 GAA variants to public databases.
• The VCEP's efforts have increased the number of expert-curated GAA variants in ClinVar.
• This work aids in resolving conflicting classifications and addressing variants of uncertain significance.

Conclusions:

• The ClinGen LD VCEP has successfully adapted and specified ACMG/AMP criteria for GAA variants in Pompe disease.
• The curated variant data improves the reliability of genetic testing for Pompe disease diagnosis and newborn screening.
• This initiative significantly contributes to the understanding and clinical interpretation of GAA variants.