Mutation analyses of Uroplakin II in children with renal tract malformations

Dagan Jenkins*, Maria Bitner-Glindzicz, Sue Malcolm, Jennifer Allison, Rose de Bruyn, Sarah Flanagan, David F M Thomas, Rachel A. Belk, Sally A. Feather, Coralie Bingham, Jennifer Southgate, Adrian S. Woolf

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Background. Uroplakin (UP) proteins cover urothelial apical surfaces. Mice lacking UPIIIa have elevated urothelial permeability and congenital renal tract anomalies, and UPIIIa mutations have been reported in children with kidney and ureter malformations. Mice with null mutation of another UP family member, UPII are often born with congenital hydronephrosis. We hypothesized that UPII mutations may be present in humans with renal tract malformations. Methods. Mutations were sought, using direct sequencing of the five UPII exons, in 42 children with diverse renal tract anomalies. Results. No UPII abnormalities were detected in 41 patients, whereas one index case had a heterozygous frameshift change which, if expressed, would generate a truncated protein. This Caucasian child presented with vesicoureteric reflux (VUR), bilateral nephropathy and renal failure. The genetic change was also found in the index case's mother who had normal renal ultrasonography, but it was absent in 150 healthy Caucasian control individuals (96 assessed by direct sequencing and another 54 assessed by restriction digests). UPII was immunolocalized in urothelium of the normal human embryonic renal pelvis in a pattern similar to UPIIIa. Conclusion. This study offers no definitive support for UPII mutations causing human renal tract malformations. In rare patients, UPII variants might be implicated in pathogenesis when acting in conjunction with other yet-to-be-defined, genetic or environmental modifying factors.

Original languageEnglish
Pages (from-to)3415-3421
Number of pages7
JournalNephrology Dialysis and Transplantation
Issue number12
Publication statusPublished - 1 Dec 2006


  • Gene
  • Malformation
  • Renal failure
  • Uroplakin
  • VUR

Cite this