Bilateral multiple renal oncocytomas and cysts associated with a constitutional translocation (8;9)(q24.1;q34.3) and a rare constitutional VHL missense substitution.
We report here on a patient with bilateral multifocal renal oncocytomas and cysts. Cytogenetic analysis of the patient's lymphocytes revealed a constitutional 46,XY,add (9)(q34.3) karyotype. The rearrangement was further resolved as a constitutional reciprocal t(8;9)(q24.1;q34.3) by microdissection and FISH. Because the 9q breakpoint was located in the same region as the tuberous sclerosis type I locus (TSC1), which is associated with renal tumors, we performed FISH with two TSC1 flanking cosmids that were mapped proximal to the 9q breakpoint, thus excluding its involvement. Loss of heterozygosity (LOH) studies of the tumors revealed LOH in chromosome I, further strengthening the molecular diagnosis of oncocytoma. A previously unreported germline missense substitution, Pro40Arg, in exon I of the VHL gene was also found in the patient's constitutional DNA, adding to the complexity of the genetic profile.
Teh
B T
BT
Department of Urology, Princess Alexandra Hospital, Woolloongabba, Brisbane, Australia.
Blennow
E
E
Giraud
S
S
Sahlén
S
S
Hii
S I
SI
Brookwell
R
R
Brauch
H
H
Nordenskjöld
M
M
Larsson
C
C
Nicol
D
D
D018249:Adenoma, Oxyphilic / Q000235:genetics*; D019943:Amino Acid Substitution / Q000235:genetics*; D001120:Arginine / Q000235:genetics; D002898:Chromosomes, Human, Pair 8 / Q000235:genetics*; D002899:Chromosomes, Human, Pair 9 / Q000235:genetics*; D016147:Genes, Tumor Suppressor / Q000235:genetics; D006801:Humans; D052177:Kidney Diseases, Cystic / Q000235:genetics*; D008025:Ligases; D008297:Male; D008875:Middle Aged; D009378:Neoplasms, Multiple Primary / Q000235:genetics*; D011392:Proline / Q000235:genetics; D011506:Proteins / Q000235:genetics*; D014178:Translocation, Genetic / Q000235:genetics*; D025521:Tumor Suppressor Proteins; D044767:Ubiquitin-Protein Ligases; D051794:Von Hippel-Lindau Tumor Suppressor Protein
D011506:Proteins; D025521:Tumor Suppressor Proteins; D001120:Arginine; D011392:Proline; D044767:Ubiquitin-Protein Ligases; D051794:Von Hippel-Lindau Tumor Suppressor Protein; D008025:Ligases; C497446:VHL protein, human