Variant reclassification and clinical implications

Area of Science:

• Genomics
• Clinical Genetics
• Medical Diagnostics

Background:

• Genomic technologies have revolutionized clinical genetic testing, making accurate molecular diagnoses essential.
• Variant classification is fundamental, but reclassification over time challenges diagnostic legitimacy.
• Variant reclassification frequency ranges from 3.6% to 58.8% based on accumulating evidence.

Purpose of the Study:

• To review the medical and scientific literature on variant reclassification.
• To focus on the clinical implications of variant reclassification.
• To explore factors influencing variant reclassification and its impact on patient care.

Main Methods:

• Literature review of medical and scientific publications.
• Analysis of studies on variant reclassification frequency and influencing factors.
• Examination of the impact of variants of uncertain significance (VUS) on clinical practice.

Main Results:

• Significant changes in variant classifications can occur within a year of initial assignment.
• Variants of uncertain significance (VUS) are problematic, influencing treatment despite recommendations against it.
• Key factors influencing reclassification include standardized guidelines, deep phenotyping, ancestry studies, databases, and bioinformatics tools.

Conclusions:

• Variant reclassification affects patient diagnosis, precision therapy, and family screening.
• Standardized guidelines and understanding influencing factors are vital for precise molecular genetic diagnoses.
• Addressing VUS reclassification is essential to enhance genetic testing credibility and clinical impact.