The False-negative Phenotype.

Area of Science:

• Genetics
• Bioethics
• Clinical Diagnostics

Background:

• Genome sequencing can identify genetic variants with uncertain clinical significance.
• Ethical dilemmas arise when pathogenic variants are found in asymptomatic individuals.
• Variable penetrance and expressivity can complicate variant interpretation.

Purpose of the Study:

• To analyze the implications of identifying pathogenic genetic variants in patients without symptoms.
• To explore two distinct interpretations of such findings: false positive versus true positive with delayed phenotyping.

Main Methods:

• Conceptual analysis of genetic variant interpretation.
• Discussion of ethical considerations in clinical genetics.
• Exploration of the 'falsely negative' phenotype concept.

Main Results:

• Two primary interpretations for asymptomatic pathogenic variants are presented: false positive results or true positive results with unexpressed phenotypes.
• The concept of a 'falsely negative' phenotype is introduced to account for true positive variants not yet manifesting clinically.

Conclusions:

• Asymptomatic pathogenic variants necessitate careful consideration of both testing accuracy and future clinical expression.
• The interpretation of genetic test results requires nuanced understanding of genetic principles and potential phenotypical evolution.
• Clinical practice may implicitly treat some cases as having a 'falsely negative' phenotype, highlighting the complexities of genetic variant interpretation.