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Nail-patella syndrome

S G Sabnis, T T Antonovych, W P Argy

    Clinical Nephrology
    |September 1, 1980
    PubMed
    Summary
    This summary is machine-generated.

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    Three patients with collagenation of the glomerular basement membrane, a kidney condition, showed symptoms without typical nail-patella syndrome features. This suggests partial gene penetrance for this hereditary disorder.

    Area of Science:

    • Nephrology
    • Genetics
    • Pathology

    Background:

    • Collagenation of the glomerular basement membrane is a pathological finding in the kidneys.
    • Nail-patella syndrome (NPS) is a rare hereditary disorder with ectodermal and mesodermal abnormalities, including nephropathy.
    • The typical clinical manifestations of NPS include nail dystrophy, patellar hypoplasia, and bony abnormalities.

    Observation:

    • Three patients (ages 8, 13, and 27) presented with varying renal manifestations: nephrotic syndrome, recurrent urinary tract infections with proteinuria and edema, and proteinuria with renal insufficiency.
    • Electron microscopy revealed collagenation of the glomerular basement membrane in all three cases.
    • These patients lacked the characteristic nail and bony abnormalities typically associated with nail-patella syndrome.

    Findings:

    Related Experiment Videos

    • The observed GBM collagenation was morphologically identical to that seen in classic nail-patella syndrome.
    • Despite the distinct renal pathology, the absence of typical ectodermal and mesodermal features challenges a full NPS diagnosis.
    • The findings suggest a potential for partial gene penetrance or isolated manifestation of the renal component of the NPS gene complex.

    Implications:

    • These cases highlight that renal pathology resembling nail-patella syndrome can occur even without the classic physical stigmata.
    • The findings expand the understanding of the clinical spectrum and genetic variability of nail-patella syndrome.
    • Further research into the genetic underpinnings of NPS is warranted to elucidate mechanisms of variable expressivity and incomplete penetrance.