The Diagnostic Dilemma of Missing Variants in Alport Syndrome
A recent article in Nature Reviews Nephrology addresses a critical challenge in molecular diagnostics for Alport syndrome, a genetic kidney disease. The authors explore the explanations for “missing” disease-causing variants when clinical suspicion of the syndrome is high. They discuss strategies for how pathology laboratories and clinicians can manage these diagnostically ambiguous cases, focusing on the integration of clinical findings with advanced genetic testing methodologies. This review highlights the evolving landscape of genetic diagnosis, where a negative molecular test does not necessarily rule out disease, emphasizing the need for comprehensive diagnostic algorithms in nephropathology.
Study Significance: For pathologists and molecular diagnosticians, this work underscores the limitations of current next-generation sequencing (NGS) panels and the importance of robust variant interpretation in genetic pathology. It directly impacts diagnostic accuracy and laboratory quality control protocols, urging a shift towards more integrative models that combine histopathology, immunohistochemistry, and molecular findings. Navigating these “missing variant” scenarios is essential for accurate tumor grading, risk stratification, and guiding patient management in hereditary renal disorders.
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