A homozygous missense mutation in human KLOTHO causes severe tumoral calcinosis

Shoji Ichikawa, Erik A. Imel, Mary L. Kreiter, Xijie Yu, Donald S. Mackenzie, Andrea H. Sorenson, Regina Goetz, Moosa Mohammadi, Kenneth E. White, Michael J. Econs

Research output: Contribution to journalArticle

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Abstract

Familial tumoral calcinosis is characterized by ectopic calcifications and hyperphosphatemia due to inactivating mutations in FGF23 or UDP-N-acetyl- α-D-galactosamine:polypeptide N-acetylgalactosaminyltransferase 3 (GALNT3). Herein we report a homozygous missense mutation (H193R) in the KLOTHO (KL) gene of a 13-year-old girl who presented with severe tumoral calcinosis with dural and carotid artery calcifications. This patient exhibited defects in mineral ion homeostasis with marked hyperphosphatemia and hypercalcemia as well as elevated serum levels of parathyroid hormone and FGF23. Mapping of H193R mutation onto the crystal structure of myrosinase, a plant homolog of KL, revealed that this histidine residue was at the base of the deep catalytic cleft and mutation of this histidine to arginine should destabilize the putative glycosidase domain (KL1) of KL, thereby attenuating production of membrane-bound and secreted KL. Indeed, compared with wild-type KL, expression and secretion of H193R KL were markedly reduced in vitro, resulting in diminished ability of FGF23 to signal via its cognate FGF receptors. Taken together, our findings provide what we believe to be the first evidence that loss-of-function mutations in human KL impair FGF23 bioactivity, underscoring the essential role of KL in FGF23-mediated phosphate and vitamin D homeostasis in humans.

Original languageEnglish (US)
Pages (from-to)2684-2691
Number of pages8
JournalJournal of Clinical Investigation
Volume117
Issue number9
DOIs
StatePublished - Sep 4 2007

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Calcinosis
Missense Mutation
Hyperphosphatemia
Mutation
Histidine
Homeostasis
Acetylgalactosamine
Fibroblast Growth Factor Receptors
Uridine Diphosphate
Glycoside Hydrolases
Hypercalcemia
Parathyroid Hormone
Carotid Arteries
Vitamin D
Minerals
Arginine
Phosphates
Ions
Membranes
Serum

ASJC Scopus subject areas

  • Medicine(all)

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A homozygous missense mutation in human KLOTHO causes severe tumoral calcinosis. / Ichikawa, Shoji; Imel, Erik A.; Kreiter, Mary L.; Yu, Xijie; Mackenzie, Donald S.; Sorenson, Andrea H.; Goetz, Regina; Mohammadi, Moosa; White, Kenneth E.; Econs, Michael J.

In: Journal of Clinical Investigation, Vol. 117, No. 9, 04.09.2007, p. 2684-2691.

Research output: Contribution to journalArticle

Ichikawa, S, Imel, EA, Kreiter, ML, Yu, X, Mackenzie, DS, Sorenson, AH, Goetz, R, Mohammadi, M, White, KE & Econs, MJ 2007, 'A homozygous missense mutation in human KLOTHO causes severe tumoral calcinosis', Journal of Clinical Investigation, vol. 117, no. 9, pp. 2684-2691. https://doi.org/10.1172/JCI31330
Ichikawa, Shoji ; Imel, Erik A. ; Kreiter, Mary L. ; Yu, Xijie ; Mackenzie, Donald S. ; Sorenson, Andrea H. ; Goetz, Regina ; Mohammadi, Moosa ; White, Kenneth E. ; Econs, Michael J. / A homozygous missense mutation in human KLOTHO causes severe tumoral calcinosis. In: Journal of Clinical Investigation. 2007 ; Vol. 117, No. 9. pp. 2684-2691.
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abstract = "Familial tumoral calcinosis is characterized by ectopic calcifications and hyperphosphatemia due to inactivating mutations in FGF23 or UDP-N-acetyl- α-D-galactosamine:polypeptide N-acetylgalactosaminyltransferase 3 (GALNT3). Herein we report a homozygous missense mutation (H193R) in the KLOTHO (KL) gene of a 13-year-old girl who presented with severe tumoral calcinosis with dural and carotid artery calcifications. This patient exhibited defects in mineral ion homeostasis with marked hyperphosphatemia and hypercalcemia as well as elevated serum levels of parathyroid hormone and FGF23. Mapping of H193R mutation onto the crystal structure of myrosinase, a plant homolog of KL, revealed that this histidine residue was at the base of the deep catalytic cleft and mutation of this histidine to arginine should destabilize the putative glycosidase domain (KL1) of KL, thereby attenuating production of membrane-bound and secreted KL. Indeed, compared with wild-type KL, expression and secretion of H193R KL were markedly reduced in vitro, resulting in diminished ability of FGF23 to signal via its cognate FGF receptors. Taken together, our findings provide what we believe to be the first evidence that loss-of-function mutations in human KL impair FGF23 bioactivity, underscoring the essential role of KL in FGF23-mediated phosphate and vitamin D homeostasis in humans.",
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AU - Mackenzie, Donald S.

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