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      La doble heterocigosis por la mutación común en el codón 39 (C>T) (β0) y la deleción siciliana (δβ0) 13.4 kb causa una beta-talasemia transfusión dependiente en dos pacientes costarricenses Translated title: Double heterozygosity for the common mutation at codon 39 (C>T) (β0) and the Sicilian (δβ0) 13.4 kb deletion, causes transfusiondependent beta-thalassemia in two Costa Rican patients

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          Abstract

          Resumen Las talasemias son desórdenes autosómicos recesivos de las cadenas de hemoglobina que poseen expresión clínica variable según el tipo de mutación o deleción. Presentamos el caso de dos jóvenes mujeres costarricenses no relacionadas entre sí y ambas diagnosticadas con la mutación común en el codón 39 (C>T) (β0) en combinación con la deleción siciliana (δβ0) 13.4 kb. La caracterización de doble heterocigota no había sido descrita antes en la literatura médica, y discutimos el significado de este genotipo que causa un defecto tipo β0 talasemia transfusión dependiente.

          Translated abstract

          Abstract Thalassemia are autosomal recessive disorders of hemoglobin chains with variable clinical expression depending on the type of mutation or deletion present. We present the common codon 39(C>T) (β0) in combination with the δβ0 13.4 kb Sicilian deletion in two non-related young women from Costa Rica. We report the characterization of the compound heterozygous not previously described phenotype, and discuss the significance of this genotype combination with a transfusion dependent β0 defect Thalassemia.

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          Clinical Classification, Screening and Diagnosis for Thalassemia

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            Interpreting elevated fetal hemoglobin in pathology and health at the basic laboratory level: new and known γ- gene mutations associated with hereditary persistence of fetal hemoglobin

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              Application of multiplex ligation-dependent probe amplification to screen for β-globin cluster deletions: detection of two novel deletions in a multi ethnic population.

              Hereditary persistence of fetal hemoglobin (HPFH) and δβ-thalassemia (δβ-thal) are heterogeneous disorders caused by deletions within the β-globin gene cluster. When combined with other β-thal mutations or structural hemoglobin (Hb) variants, these deletions give rise to clinical phenotypes ranging from an asymptomatic condition to β-thal major (β-TM). Overlap in hematological parameters and variability in expression of Hbs A2 and F make molecular testing necessary to distinguish clinically relevant deletions. Multiplex ligation-dependent probe amplification (MLPA) was used to screen for β-globin gene cluster deletions in 49 unresolved samples referred for a suspected β-thal anomaly. The 1.39 kb Black β(0), 3.5 kb Thai β(0), 118 kb Filipino β(0), 11.8 kb Black (δβ)(0), 13.4 kb Sicilian (δβ)(0), 35.8 kb Black ((A)γδβ)0, Hb Lepore-Boston-Washington (Hb LBW) and HPFH-2 deletions, and two novel deletions, a 61.7 kb Pakistani β(0) deletion and an ((A)γδβ)(0) deletion, were identified in 15 cases. Detection of both known and unknown deletional Hb disorders provides for appropriate clinical management and genetic counseling.
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                Author and article information

                Journal
                amc
                Acta Médica Costarricense
                Acta méd. costarric
                Colegio de Médicos y Cirujanos de Costa Rica (San José, San José, Costa Rica )
                0001-6012
                0001-6002
                September 2022
                : 64
                : 3
                : 50-55
                Affiliations
                [2] San José orgnameCaja Costarricense de Seguro Social orgdiv1Hospital Nacional de Niños Dr. Carlos Sáenz Herrera orgdiv2Laboratorio de Estudios Especializados e Investigación Costa Rica
                [4] San José orgnameCaja Costarricense de Seguro Social orgdiv1Hospital Nacional de Niños Dr. Carlos Sáenz Herrera orgdiv2Laboratorio de Estudios Especializados e Investigación Costa Rica
                [3] San José orgnameCaja Costarricense de Seguro Social orgdiv1Hospital Nacional de Niños Dr. Carlos Sáenz Herrera orgdiv2Laboratorio de Tamizaje Neonatal Costa Rica
                [1] San José orgnameCaja Costarricense de Seguro Social orgdiv1Hospital Nacional de Niños Dr. Carlos Sáenz Herrera orgdiv2Servicio de Hematología Costa Rica
                Article
                S0001-60022022000300050 S0001-6002(22)06400300050
                6a0e513f-d203-41e4-892b-79a5903c188c

                This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 International License.

                History
                : 08 February 2022
                : 30 November 2022
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 10, Pages: 6
                Product

                SciELO Costa Rica

                Categories
                Casos clínicos

                Beta (β) thalassemia,doble heterocigosis,anemia,deleción siciliana,delta-beta (δβ)-talasemia,Beta (β)-talasemia,compound heterozygous,sicilian deletion,delta-beta (δβ) thalassemia

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