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Hereditary hypophosphatemic rickets with hypercalciuria.

M Tieder, D Modai, R Samuel

    The New England Journal of Medicine
    |March 7, 1985
    PubMed
    Summary
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    This study identifies a new hereditary syndrome causing hypophosphatemic rickets and hypercalciuria. Phosphate supplementation reversed most symptoms, suggesting a renal phosphate leak as the primary defect.

    Area of Science:

    • Endocrinology
    • Nephrology
    • Genetics

    Background:

    • Hereditary hypophosphatemic rickets and hypercalciuria is a rare condition.
    • Understanding its genetic basis and pathophysiology is crucial for effective treatment.

    Purpose of the Study:

    • To characterize a novel hereditary syndrome presenting with hypophosphatemic rickets and hypercalciuria.
    • To investigate the underlying mechanisms and therapeutic responses.

    Main Methods:

    • Clinical evaluation of six affected individuals from one family.
    • Biochemical analyses including serum calcium, phosphate, 1,25-dihydroxyvitamin D, and parathyroid hormone levels.
    • Measurement of renal phosphate clearance (TmP/GFR) and urinary calcium excretion.

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    Main Results:

    • Patients exhibited rickets, short stature, increased renal phosphate clearance, hypercalciuria, and elevated 1,25-dihydroxyvitamin D.
    • Serum calcium was normal, with suppressed parathyroid function.
    • Phosphate supplementation normalized clinical and biochemical findings, except for decreased TmP/GFR.

    Conclusions:

    • The syndrome is characterized by a renal phosphate leak leading to hypophosphatemia and secondary hypercalciuria.
    • Elevated 1,25-dihydroxyvitamin D plays a key role in calcium absorption and parathyroid suppression.
    • Phosphate is critical in regulating 1,25-dihydroxyvitamin D production in humans.