Abstract | BACKGROUND:
Familial juvenile hyperuricemic nephropathy (FJHN) is a dominantly inherited condition characterized by young-onset hyperuricemia, gout, and renal disease. The etiologic genes are unknown, although a locus on chromosome 16 has been identified in some kindreds. Mutations in the gene encoding hepatocyte nuclear factor (HNF)-1beta have been associated with dominant inheritance of a variety of disorders of renal development, particularly renal cystic disease and early onset diabetes; hyperuricemia has been reported in some kindreds. METHODS: To assess a possible role for the HNF-1beta gene in some FJHN kindreds we sequenced the HNF-1beta gene in subjects from three unrelated FJHN families with atypical features of renal cysts or abnormalities of renal development. We also compared serum urate levels in subjects with HNF-1beta mutations with populations of controls, type 2 diabetic subjects, and subjects with mild chronic renal failure without HNF-1beta mutations. RESULTS: A splice-site mutation in intron 2, designated IVS2+1G>T, showed complete co-segregation with FJHN in one family with diabetes. Serum urate levels were significantly higher in the HNF-1beta subjects compared with the normal control subjects (384 micromol/L vs. 264 micromol/L, P = 0.002) and the type 2 diabetic subjects (397 micromol/L vs. 271 micromol/L, P = 0.01). Comparison of serum urate levels in the HNF-1beta subjects with gender-matched subjects with renal impairment of other causes did not reach significance (402 micromol/L vs. 352 micromol/L, P = 0.2). CONCLUSION:
Hyperuricemia and young-onset gout are consistent features of the phenotype associated with HNF-1beta mutations, but the mechanism is uncertain. Families with HNF-1beta mutations may fit diagnostic criteria for FJHN. Identification of HNF-1beta patients by recognizing the features of diabetes and disorders of renal development is important in resolving the genetic heterogeneity in FJHN.
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Authors | Coralie Bingham, Sian Ellard, William G van't Hoff, H Anne Simmonds, Anthony M Marinaki, Michael K Badman, Peter H Winocour, Amanda Stride, Christopher R Lockwood, Anthony J Nicholls, Katharine R Owen, Ghislaine Spyer, Ewan R Pearson, Andrew T Hattersley |
Journal | Kidney international
(Kidney Int)
Vol. 63
Issue 5
Pg. 1645-51
(May 2003)
ISSN: 0085-2538 [Print] United States |
PMID | 12675839
(Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
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Chemical References |
- DNA-Binding Proteins
- HNF1B protein, human
- Transcription Factors
- Hepatocyte Nuclear Factor 1-beta
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Topics |
- Adult
- Child
- DNA-Binding Proteins
(genetics)
- Family Health
- Female
- Gout
(genetics)
- Hepatocyte Nuclear Factor 1-beta
- Humans
- Hyperuricemia
(genetics)
- Kidney Diseases
(genetics)
- Male
- Pedigree
- Phenotype
- Transcription Factors
(genetics)
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