20 c.481C>T p.Arg161X p.R161X Familial VHL
Between 1994 and 2001, the Dutch VHL working group conducted DNA analysis on 146 probands with VHL-associated manifestations. DNA of probands was extracted from peripheral blood samples. Exons 1, 2 and 3 of the VHL gene and their flanking untranslated and intronic coding sequences were amplified by PCR and subjected to semi-automated sequence analysis. Screening for structural rearrangements, including deletions, involving the VHL gene was performed by Southern blot analysis and the multiplex ligation-dependent probe amplification (MLPA) assay. Deletions encompassing the entire VHL gene were confirmed by FISH analysis on lymphocytes from affected individuals. VHL mutations were identified in 43 families. Family 20 has one affected member. Genetic analysis reveals mutation R161*(c.481C>T) in the VHL gene. The patient has a family history of VHL disease and presented with retinal capillary hemangioma, renal cyst and pancreatic cysts. ACMG: 'PP4' because the patient's phenotype and family history are highly specific for a disease with single genetic etiology.