Abstract
Autosomal dominant polycystic kidney disease (ADPKD) is a common nephropathy caused by mutations in either PKD1 or PKD2. Mutations in PKD1 account for ∼85% of cases and cause more severe disease than mutations in PKD2. Diagnosis of ADPKD before the onset of symptoms is usually performed using renal imaging by either ultrasonography, CT or MRI. In general, these modalities are reliable for the diagnosis of ADPKD in older individuals. However, molecular testing can be valuable when a definite diagnosis is required in young individuals, in individuals with a negative family history of ADPKD, and to facilitate preimplantation genetic diagnosis. Although linkage-based diagnostic approaches are feasible in large families, direct mutation screening is generally more applicable. As ADPKD displays a high level of allelic heterogeneity, complete screening of both genes is required. Consequently, such screening approaches are expensive. Screening of individuals with ADPKD detects mutations in up to 91% of cases. However, only ∼65% of patients have definite mutations with ∼26% having nondefinite changes that require further evaluation. Collation of known variants in the ADPKD mutation database and systematic scoring of nondefinite variants is increasing the diagnostic value of molecular screening. Genic information can be of prognostic value and recent investigation of hypomorphic PKD1 alleles suggests that allelic information may also be valuable in some atypical cases. In the future, when effective therapies are developed for ADPKD, molecular testing may become increasingly widespread. Rapid developments in DNA sequencing may also revolutionize testing.
Key Points
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Molecular diagnostics is available and increasingly informative in autosomal dominant polycystic kidney disease (ADPKD)
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Determining the disease status of potential living, related donors is where molecular diagnostics is most valuable at present
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A molecular diagnosis can clarify the disease status in patients with a negative family history and/or unusually mild or severe polycystic kidney disease
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Determining whether a family carries mutations in PKD1 or PKD2 is of prognostic value
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Hypomorphic PKD1 alleles can significantly modify the ADPKD phenotype and the identification of specific alleles may be of prognostic value, especially in early-onset ADPKD
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As therapies for ADPKD are developed, molecular testing will likely become increasingly valuable
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Harris, P., Rossetti, S. Molecular diagnostics for autosomal dominant polycystic kidney disease. Nat Rev Nephrol 6, 197–206 (2010). https://doi.org/10.1038/nrneph.2010.18
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DOI: https://doi.org/10.1038/nrneph.2010.18
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