Genetic analysis in Bartter syndrome from India

Area of Science:

• Nephrology
• Medical Genetics
• Molecular Biology

Background:

• Bartter syndrome is a group of inherited salt-losing tubulopathies.
• Characterized by hypokalemic metabolic alkalosis, hyperreninemia, and hyperaldosteronism.
• Genetic testing for these conditions is not routinely performed in the Indian population.

Observation:

• Two cases of Bartter syndrome from India underwent genetic analysis.
• The first case presented with antenatal Bartter syndrome, massive polyuria, and hyperkalemia.
• The second case exhibited classical Bartter syndrome phenotype.

Findings:

• Compound heterozygous mutations in the KCNJ1 (ROMK) gene, specifically p(Leu220Phe) and p(Thr191Pro), were identified in the first patient.
• A novel heterozygous mutation in the SLC12A gene, p(Ala232Thr), was found in the second patient.
• This study represents the first genetic analysis of Bartter syndrome cases in India.

Implications:

• Bartter syndrome is primarily a clinical diagnosis.
• Genetic analysis is crucial for accurate prognostication.
• Genetic testing aids in providing effective genetic counseling for affected families.