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Acta Médica Costarricense

On-line version ISSN 0001-6002Print version ISSN 0001-6012


CALDERON-BRENES, Melissa; PORRAS-MORENO, Adriana; GRANADOS-ALFARO, Paola  and  CARTIN-SANCHEZ, Walter. Hemoglobin H disease: first case of double heterozygous hemoglobin Constant Spring / Southeast Asian in Costa Rica. Acta méd. costarric [online]. 2020, vol.62, n.1, pp.38-42. ISSN 0001-6002.

Hemoglobin H disease occurs in patients with alpha thalassemia, diseases associated with hypochromic microcytic anemia, mainly due to deletions in the alpha globin gene, which decreases the production of the alpha globin chain and promotes the formation of hemoglobin variants. When hemoglobin variants are detected in alpha thalassemias it is usually due to homozygoys or doublé heterozygous genotypes, for mutations and deletions of the alpha globin gene. This article describes the first case in Costa Rica of two siblings with hemoglobin H disease, who phenotypically presented the hemoglobin H and Constant Spring hemoglobin variants in the electrophoretic analysis of the hemoglobin, and whose molecular DNA analysis of the alpha globin gene detected both, the Southeast Asian deletion and the mutation for Constant Spring Hemoglobin, being diagnosed as compound heterozygous for alpha thalassemia (genotipe --SEA/ααCS).

Keywords : Hemoglobin; anemia; thalassemia alfa; hemoglobin H.

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