Journal
BIOMEDICINES
Volume 10, Issue 9, Pages -Publisher
MDPI
DOI: 10.3390/biomedicines10092265
Keywords
uromodulin; chronic kidney disease (CKD); autosomal dominant tubulointerstitial kidney disease (ADTKD); kidney failure (KF)
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Funding
- Foundation for Poison Control [MOST 108-2314-B-400-041-MY3, MOST 111-2314-B-400-039, MOST 106-2314-B-037-063-MY3]
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This study reveals the significance of ADTKD-UMOD as a cause of chronic kidney disease in the Taiwanese population, identifying two previously unreported UMOD missense variants.
UMOD is the first identified and the most commonly mutated gene that causes autosomal dominant tubulointerstitial kidney disease (ADTKD). Recent studies have shown that ADTKD-UMOD is a relatively common cause of chronic kidney disease (CKD). However, the status of ADTKD-UMOD in Taiwan remains unknown. In this study, we identified three heterozygous UMOD missense variants, c.121T > C (p.Cys41Arg), c.179G > A (p.Gly60Asp), and c.817G > T (p.Val273Phe), in a total of 221 selected CKD families (1.36%). Two of these missense variants, p.Cys41Arg and p.Gly60Asp, have not been reported previously. In vitro studies showed that both uromodulin variants have defects in cell membrane trafficking and excretion to the culture medium. The structure model predicted altered disulfide bond formation in both variants, but only p.Gly60Asp was predicted to cause protein destabilization. Our findings extend the mutation spectrum and indicate that the ADTKD-UMOD contributed to a small but significant cause of CKD in the Taiwanese population.
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