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The VUS Challenge in Cystic Kidney Disease: A Case-Based Review. | LitMetric

The VUS Challenge in Cystic Kidney Disease: A Case-Based Review.

Kidney360

Division of Nephrology and Hypertension, Mayo Clinic, Rochester, Minnesota.

Published: January 2024

AI Article Synopsis

  • * Targeted next-generation sequencing enables affordable genetic testing in clinics, making pre- and post-testing counseling vital to ensure proper understanding and assessment of genetic variants.
  • * The presence of variants of uncertain significance (VUS) poses challenges for clinicians, but using tools like the Mayo/Polycystic Kidney Disease Foundation variant database helps in evaluating these variants through patient-specific and allele-related factors.

Article Abstract

Genetic testing in nephrology is becoming increasingly important to diagnose patients and to provide appropriate care. This is especially true for autosomal dominant polycystic kidney disease (ADPKD) because this is a common cause of kidney failure and genetically complex. In addition to the major genes, PKD1 and PKD2 , there are at least six minor loci, and phenotypic, and in some cases, genetic overlap with other cystic disorders. Targeted next-generation sequencing, a low-cost, high-throughput technique, has made routine genetic testing viable in nephrology clinics. Appropriate pre- and post-testing genetic counseling is essential to the testing process. Carefully assessing variants is also critical, with the genetic report classifying variants in accordance with American College of Medical Genetics and Genomics guidelines. However, variant of uncertain significance (VUSs) may pose a significant challenge for the ordering clinician. In ADPKD, and particularly within PKD1 , there is high allelic heterogeneity; no single variant is present in more than 2% of families. The Mayo/Polycystic Kidney Disease Foundation variant database, a research tool, is the best current database of PKD1 and PKD2 variants containing over 2300 variants identified in individuals with polycystic kidney disease, but novel variants are often identified. In patients with a high pretest probability of ADPKD on the basis of clinical criteria, but no finding of a pathogenic (P) or likely pathogenic (LP) variant in a cystic kidney gene, additional evaluation of cystic gene VUS can be helpful. In this case-based review, we propose an algorithm for the assessment of such variants in a clinical setting and show how some can be reassigned to a diagnostic grouping. When assessing the relevance of a VUS, we consider both patient/family-specific and allele-related factors using population and variant databases and available prediction tools, as well as genetic expertise. This analysis plus further family studies can aid in making a genetic diagnosis.

Download full-text PDF

Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10833605PMC
http://dx.doi.org/10.34067/KID.0000000000000298DOI Listing

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