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  • Title: Liddle's syndrome in an African male due to a novel frameshift mutation in the beta-subunit of the epithelial sodium channel gene.
    Author: Freercks R, Meldau S, Jones E, Ensor J, Weimers-Willard C, Rayner B.
    Journal: Cardiovasc J Afr; 2017 Sep 23; 28(4):e4-e6. PubMed ID: 29144530.
    Abstract:
    Resistant hypertension is a common clinical problem in South Africa and is frequently associated with low renin and aldosterone levels, especially in black Africans. In South Africa, novel variants in the epithelial sodium channel (ENaC) have been described to be associated with varying degrees of hypokalaemia and hypertension due to primary sodium retention. We report here a case of Liddle's syndrome due to a novel c.1709del11 (p.Ser570Tyrfs*20) deletion in the beta-subunit of the ENaC in a young black African male. We discuss the likely pathogenesis of hypertension in this setting as well as the treatment options available in South Africa aimed at the ENaC. This case highlights the need for vigilance in detecting and appropriately treating low-renin and low-aldosterone hypertension in view of the frequency of the described variants of the ENaC channel in our country. Specific therapy such as amiloride should be made more widely available.
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