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Liddle's syndrome mechanisms, diagnosis and management.

Benjamin T Enslow1, James D Stockand1, Jonathan M Berman2

  • 1UT Health, San Antonio, TX, USA.

Integrated Blood Pressure Control
|October 1, 2019
PubMed
Summary

Liddle's syndrome is a genetic disorder causing hypertension due to increased sodium reabsorption from mutations in the Epithelial Sodium Channel (ENaC). Treatments include potassium-sparing diuretics and low-sodium diets.

Keywords:
ENaCLiddle’s syndromeblood pressuredistal nephronhypertension

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Area of Science:

  • Nephrology
  • Genetics
  • Molecular Biology

Background:

  • Liddle's syndrome is a rare genetic disorder characterized by early-onset hypertension, hypokalemic metabolic alkalosis, hyporeninemia, and suppressed aldosterone.
  • It stems from excessive sodium reabsorption in the distal nephron, primarily due to mutations in the Epithelial Sodium Channel (ENaC).

Purpose of the Study:

  • To review the clinical features, molecular mechanisms, diagnosis, and prevalence of Liddle's syndrome.
  • To differentiate Liddle's syndrome from other genetic disorders with similar phenotypes.

Main Methods:

  • Literature review focusing on clinical presentation, genetic mutations, and molecular pathways of Liddle's syndrome.
  • Examination of diagnostic criteria, differential diagnoses, and population-level prevalence data.

Main Results:

  • Mutations in ENaC subunits lead to increased channel activity by impairing ubiquitination and reducing internalization, or by increasing channel open probability.
  • Clinical diagnosis is based on phenotype and confirmed by genetic testing.
  • Potassium-sparing diuretics and dietary sodium restriction are effective treatments.

Conclusions:

  • Liddle's syndrome results from gain-of-function mutations in ENaC, leading to severe hypertension and electrolyte imbalances.
  • Understanding the molecular basis is crucial for accurate diagnosis and effective management.
  • Further research into population prevalence is warranted.