Genetic disorders of phosphate regulation.

Pediatric Nephrology : Journal of the International Pediatric Nephrology Association
Jyothsna Gattineni, Michel G Baum

Abstract

Regulation of phosphate homeostasis is critical for many biological processes, and both hypophosphatemia and hyperphosphatemia can have adverse clinical consequences. Only a very small percentage (1%) of total body phosphate is present in the extracellular fluid, which is measured by routine laboratory assays and does not reflect total body phosphate stores. Phosphate is absorbed from the gastrointestinal tract via the transcellular route [sodium phosphate cotransporter 2b (NaPi2b)] and across the paracellular pathway. Approximately 85% of the filtered phosphate is reabsorbed from the kidney, predominantly in the proximal tubule, by NaPi2a and NaPi2c, which are present on the brush border membrane. Renal phosphate transport is tightly regulated. Dietary phosphate intake, parathyroid hormone (PTH), 1,25 (OH)2 vitamin D3, and fibroblast growth factor 23 (FGF23) are the principal regulators of phosphate reabsorption from the kidney. Recent advances in genetic techniques and animal models have identified many genetic disorders of phosphate homeostasis. Mutations in NaPi2a and NaPi2c; and hormonal dysregulation of PTH, FGF23, and Klotho, are primarily responsible for most genetic disorders of phosphate transport. The main focus of t...Continue Reading

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Citations

Sep 20, 2012·Pediatric Nephrology : Journal of the International Pediatric Nephrology Association·Cristina ViganòAlberto Bettinelli
Mar 9, 2013·Frontiers of Medicine·Eryuan Liao
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Jun 3, 2021·Genes·Anna PapadopoulouFotini-Eleni Karachaliou

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Methods Mentioned

BETA
glycosylation

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