Asunto(s)

Eliminación de Secuencia , Talasemia alfa , Humanos , Talasemia alfa/genética , Brasil , Masculino , Globinas alfa/genética , Niño , Femenino , Hemoglobina H/genética

Asunto(s)

Elementos de Facilitación Genéticos , Hemoglobina H/genética , Globinas alfa/genética , Talasemia alfa/genética , Adulto , Alelos , Cromatina/genética , Cromatina/ultraestructura , Cromosomas Humanos Par 16/genética , Cromosomas Humanos Par 16/ultraestructura , Eritroblastos/patología , Eritropoyesis , Femenino , Eliminación de Gen , Regulación de la Expresión Génica , Genotipo , Hemoglobina E/genética , Hemoglobina H/análisis , Humanos , Masculino , Linaje , ARN Mensajero/biosíntesis , ARN Mensajero/genética , Eliminación de Secuencia , Suriname/etnología , Globinas alfa/biosíntesis , Talasemia alfa/sangre , Globinas beta/genética

RESUMEN

Resumen La enfermedad por hemoglobina H es un cuadro clínico que se presenta en las alfa talasemias, las cuales son enfermedades que cursan con anemia microcítica hipocrómica, debidas principalmente a deleciones en el gen de alfaglobina, lo que disminuye la producción de la cadena de alfa globina y promueve la formación de variantes de hemoglobina. Cuando se detectan variantes de hemoglobina en las alfa talasemias, por lo general, se debe a genotipos homocigotas o dobles heterocigotas para mutaciones y deleciones del gen de alfa globina coheredadas. En este artículo se describe el primer caso en Costa Rica, de dos hermanos con enfermedad por hemoglobina H, que fenotípicamente presentaron las variantes de hemoglobina H y hemoglobina Constant Spring en el análisis electroforético de la hemoglobina, y cuyo análisis molecular del gen de alfa globina detectó tanto la deleción sudeste asiático como la mutación para hemoglobina Constant Spring, siendo diagnosticados como dobles heterocigotos por alfa talasemia (genotipo --SEA/ααCS).

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Abstract 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).

Asunto(s)

Humanos , Femenino , Lactante , Hemoglobina H , Talasemia alfa , Costa Rica , Hemoglobinopatías/genética , Tamización de Portadores Genéticos , Anemia Hipocrómica

RESUMEN

BACKGROUND: Sickle cell anemia (SCA) patients exhibit sub-phenotypes associated to hemolysis and vaso-occlusion. The disease has a chronic inflammatory nature that has been also associated to alterations in the lipid profile. This study aims to analyze hematological and biochemical parameters to provide knowledge about the SCA sub-phenotypes previously described and suggest a dyslipidemic sub-phenotype. METHODS: A cross-sectional study was conducted from 2013 to 2014, and 99 SCA patients in steady state were enrolled. We assessed correlations and associations with hematological and biochemical data and investigated the co-inheritance of -α3.7Kb-thalassemia (-α3.7Kb-thal). Correlation analyses were performed using Spearman and Pearson coefficient. The median of quantitative variables between two groups was compared using t-test and Mann-Whitney. P-values <0.05 were considered statistically significant. RESULTS: We found significant association of high lactate dehydrogenase levels with decreased red blood cell count and hematocrit as well as high levels of total and indirect bilirubin. SCA patients with low nitric oxide metabolites had high total cholesterol, high-density lipoprotein cholesterol, and low-density lipoprotein cholesterol and reduced very low-density cholesterol, triglycerides, direct bilirubin level and reticulocyte counts. In SCA patients with high-density lipoprotein cholesterol greater than 40 mg/dL, we observed increased red blood cell count, hemoglobin, hematocrit, and fetal hemoglobin and decreased nitric oxide metabolites levels. The presence of -α3.7Kb-thal was associated with high red blood cell count and low mean corpuscular volume, mean corpuscular hemoglobin, platelet count and total and indirect bilirubin levels. CONCLUSIONS: Our results provide additional information about the association between biomarkers and co-inheritance of -α3.7Kb-thal in SCA, and suggest the role of dyslipidemia and nitric oxide metabolites in the characterization of this sub-phenotype.

Asunto(s)

Anemia de Células Falciformes/fisiopatología , Dislipidemias/etiología , Anemia de Células Falciformes/sangre , Anemia de Células Falciformes/complicaciones , Anemia de Células Falciformes/genética , Bilirrubina/sangre , Biomarcadores/sangre , Brasil , Estudios Transversales , Recuento de Eritrocitos , Índices de Eritrocitos , Eliminación de Gen , Hematócrito , Hemoglobina H/genética , Heterocigoto , Homocigoto , Humanos , L-Lactato Deshidrogenasa/sangre , Lípidos/sangre , Óxido Nítrico/sangre , Recuento de Plaquetas , Talasemia alfa/complicaciones , Talasemia alfa/genética

RESUMEN

BACKGROUND Renal failure is common among older patients with sickle cell disease; this is preceded by subclinical glomerular hyperfiltration. Data about renal function of adults with sickle cell disease have been reported, but data on children is scarce, especially when comparing heterozygotic and homozygotic patients. OBJECTIVE The goal of this study was to investigate the glomerular filtration rate of heterozygotic and homozygotic children with sickle cell disease. METHODS The glomerular filtration rate of 11 children with sickle cell disease [7 homozygotic (SS) and 4 heterozygotic (SC)] with a mean age of 11 years (standard deviation: ± 5 years) was evaluated using standard laboratory techniques. Results are presented as descriptive analysis. RESULTS Our results suggest that glomerular hyperfiltration is present in children with sickle cell disease; this is more evident in homozygotic than heterozygotic children. CONCLUSION There is evidence of a need to monitor the renal function of children with sickle cell disease when special attention should be paid to homozygotic patients.

Asunto(s)

Humanos , Talasemia alfa , Anemia de Células Falciformes , Niño , Barrera de Filtración Glomerular , Hemoglobina H , Enfermedad de la Hemoglobina SC , Hemoglobina Falciforme

RESUMEN

La enfermedad por Hemoglobina H es la forma más común de talasemia intermedia y posee muchas características que requieren cuidadosa consideración en su manejo clínico. En lamayoría de los casos, la enfermedad por Hemoglobina H resulta de un estado doble heterocigoto producido por unadeleción tipo α0 que remueve ambos genes de α-globina en uno de los cromosoma 16 y de una deleción tipo α+ en uno de los genes de α-globina en el otro cromosoma 16, resultando enuna condición tipo (--/-α). El exceso de cadenas β de globina precipita y forma una hemoglobina anormal característica; la hemoglobina H (Hb H), un tetrámero de β globina (β4). Lospacientes con hemoglobina H que se encuentran en estado compensado pueden tener niveles de hemoglobina entre 9 y 10 g/dL, sin embargo durante las crisis hemolíticas, que se desarrollan durante o después de infecciones agudas con fiebres altas, la hemoglobina puede llegar a disminuirsignificativamente y los pacientes pueden desarrollar shock y fallo renal. Aún cuando la esplenectomía eleva la hemoglobina significativamente, no se recomienda porque la mayoría delos pacientes tienen un nivel aceptable de hemoglobina mientras se encuentren compensados. Se presenta el primercaso descrito en Costa Rica de enfermedad por hemoglobina H variante del sudeste asiático (-α3.7/ --SEA).

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Hemoglobin H (Hb H) disease is the most common form of thalassemia intermedia and has many features that require careful consideration in its management. In the majority of cases, the disease results from double heterozygosity for α0- thalassemia due to deletions that remove both linked α-globin genes on one chromosome 16, and deletional α+ from single α-globin gene deletions on the other chromosome 16 resulting in a (--/-α) condition. The excess β globin chainprecipitates and forms a characteristic abnormal hemoglobin: hemoglobin H a β globin tetramer (β4). In a steady state,patients with Hb H disease have hemoglobin levels around 9 to 10 g/dL however, during a hemolytic crisis, which frequently occur in or after acute infections causing high fever, the hemoglobin may drop significantly and the patients can develop shock or renal shutdown. Even though splenectomy leads to significant elevation of hemoglobin levels, it is not recommended because the majority of patients do well with said steady-state hemoglobin levels. We present here the first case of hemoglobin H (-α3.7/ --SEA) southeast Asia variant described in Costa Rica.

Asunto(s)

Humanos , Femenino , Preescolar , Anemia Hemolítica/diagnóstico , Hemoglobina H , Talasemia alfa/diagnóstico , Costa Rica

RESUMEN

Introdução: Talassemia alfa é uma síndrome associada à redução da síntese de cadeias de globina do tipo alfa. A gravidade das manifestações clínicas está relacionada com a quantidade de globinas produzida e a estabilidade das cadeias beta presentes em excesso. A talassemia alfa mínima resulta da deleção de apenas um dos quatro genes a (-α/αα). Clinicamente apresenta anemia leve com microcitose ou ausência de anemia, sendo o diagnóstico realizado por meio de visualização da hemoglobina (Hb) H por eletroforese alcalina em acetato de celulose ou por identificação de inclusões celulares de Hb H coradas pelo azul de crezil brilhante. Objetivo: Avaliar portadores de talassemia alfa e seus respectivos progenitores, correlacionando perfil hematológico e presença de Hb H, utilizando procedimentos laboratoriais clássicos em três diferentes amostragens. Discussão e conclusão: Os dados obtidos mostram que a presença de Hb H, indicativo de talassemia alfa, pode não ser confirmada em uma análise posterior. Entre os fatores que podem influenciar no não aparecimento de Hb H em pessoa comprovadamente com talassemia alfa está a deficiência de ferro. A talassemia alfa está associada a defeitos envolvendo os genes codificadores da cadeia alfa, mas também pode estar relacionada com desbalanciamento temporário na expressão dos genes globina, diminuição de alfa ou aumento de beta, o que poderia explicar o aparecimento de tetrâmeros de cadeia beta (Hb H), sugerindo diagnóstico de talassemia alfa mínima.

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Introduction: Alpha thalassemia is a syndrome with associated with the reduction of alpha globin chain synthesis. The severity of clinical manifestations is related to the amount of globins produced and the stability of beta chains that are present in excess. Alpha thalassemia minor is caused by the deletion of one of the four genes a (-α/αα). Clinically, it presents mild anemia with microcytosis or absence of anemia. The diagnosis is made by the visualization of Hb H through alkaline electrophoresis on cellulose acetate or by the identification of inclusion bodies stained with brilliant cresyl blue. Objective: Evaluate alpha thalassemia carriers and their respective progenitors, correlating their hematology profile and the presence of Hb H by means of standard laboratory procedures in three different samplings. Discussion and conclusion: The results show that the presence of Hb H, which is indicative of alpha thalassemia, may not be confirmed in a subsequent analysis. Iron deficiency in Hb H carriers is among the factors that may influence on the absence of Hb H in alpha thalassemia proven patients. Alpha thalassemia is associated with genetic defects involving alpha chain encoding genes, but may be also associated with a temporary imbalance of globin gene expression, alpha chain reduction or beta increase, which could explain the presence of beta chain tetramer (Hb H) leading to the diagnosis of alpha thalassemia minor.

Asunto(s)

Humanos , Masculino , Femenino , Hemoglobina H , Talasemia alfa/diagnóstico , Talasemia alfa/genética

RESUMEN

We are reporting here the results of differential gene expression experiments comparing two siblings, a 21-yr-old male and a 19-yr-old female, with the same alpha-thalassemia genotype (-alpha(3.7)/(--SEA)) and quite different levels of Hb H in the peripheral blood (18.7 and 5%, respectively). By using mRNA differential-display reverse-transcription-PCR and suppression subtractive hybridization, two main transcripts were selected in both procedures and validated by qRT-PCR, one corresponding to the phosphatidylinositol phosphate 4-kinase type II-alpha (PIP4KIIA) gene and the other to the beta-globin gene, both over expressed in the patient with the higher percentage of Hb H. Type II PIP kinases produce phosphatidylinositol 4,5 biphosphate, a critical and pleiotropic regulatory molecule involved in diverse cellular activities, including gene expression. Our results suggest that PIP4KIIA may be one of the factors related to the regulation of the beta-globin gene expression and the different levels of Hb H in alpha-thalassemic patients.

Asunto(s)

Regulación Enzimológica de la Expresión Génica , Hemoglobina H/biosíntesis , Fosfotransferasas (Aceptor de Grupo Alcohol)/biosíntesis , Reticulocitos/enzimología , Hermanos , Talasemia alfa/enzimología , Globinas beta/biosíntesis , Femenino , Humanos , Masculino , Fosfatidilinositol 4,5-Difosfato/metabolismo , Adulto Joven

RESUMEN

Nas talassemias alfa, a HbH pode ser detectada, nos eritrócitos do sangue periférico como inclusões celulares quando coradas com azul crezil brillante. Este teste simples é útil para o diagnóstico de talassemia alfa, no entanto, a identificação dos corpos de inclusão de HbH é um processo laborioso e os resultados são altamente dependentes do observador. No intuito de melhorar a identificação das inclusões, foi testado um método alternativo para espalhar as amostras nas lâminas. Amostras de sangue foram espalhadas nas lâminas usando-se o método clássico e o método alternativo. O método alternativo permitiu uma melhor identificação das inclusões de HbH do que o método clássico. Nossos resultados mostraram que o método alternativo é uma opção útil para a pesquisa dos corpúsculos de inclusão de HbH naquelas amostras onde o método clássico não o permite.

Asunto(s)

Humanos , Talasemia alfa , Técnicas de Laboratorio Clínico , Hemoglobina H

RESUMEN

Alpha-Thalassemia is one of the most prevalent hemoglobin disorders in the world, in South-East Asians, the --SEA allele is widely found in the HbH disease patients. The purpose of this work is to describe the molecular characteristics of Hemoglobin H disease in three patients from two Mexican families, as well to analyze the DNA sequence of the --SEA allele to determine the precise site of the crossover. The -alpha 3.7 and --SEA alleles were identified using an established long-PCR method modified in our laboratory. The crossover site of --SEA mutation was analyzed by DNA sequencing. The three HbH subjects showed the same genotype -alpha3.7/--SEA. The -alpha3.7 allele has been observed in almost every racial studied group, whereas the --SEA allele is predominant in South-East Asian countries. DNA analysis through the breakpoint sites of the SEA allele in both families showed the 5' breakpoint at the third base of codon 28 in the psi alpha 2 gene and the 3' breakpoint within an Alu-Jo sequence, 1,328 nucleotides upstream of the 3'HVR. Therefore the size of the deletion is 19,303 nucleotides. This is the first report in which the flanking deletion sites of the --SEA mutation have been analyzed in Mexican patients, the 5' and 3' ends of the deletion is well determined.

Asunto(s)

Hemoglobina H/genética , Talasemia alfa/genética , Alelos , Niño , Análisis Mutacional de ADN , Femenino , Humanos , Masculino , México , Reacción en Cadena de la Polimerasa

RESUMEN

α-Thalassemia is one of the most prevalent hemoglobin disorders in the world, in South-East Asians, the--SEA allele is widely found in the HbH disease patients. The purpose of this work is to describe the molecular characteristics of Hemoglobin H disease in three patients from two Mexican families, as well to analyze the DNA sequence of the --SEA allele to determine the precise site of the crossover. The -α3.7 and --SEA alleles were identified using an established long-PCR method modified in our laboratory. The crossover site of --SEA mutation was analyzed by DNA sequencing. The three HbH subjects showed the same genotype -α3.7/--SEA. The -α3.7 allele has been observed in almost every racial studied group, whereas the --SEA allele is predominant in South-East Asian countries. DNA analysis through the breakpoint sites of the --SEA allele in both families showed the 5' breakpoint at the third base of codon 28 in the ψα2 gene and the 3' breakpoint within an Alu-Jo sequence, 1,328 nucleotides upstream of the 3'HVR. Therefore the size of the deletion is 19,303 nucleotides. This is the first report in which the flanking deletion sites of the--SEA mutation have been analyzed in Mexican patients, the 5' and 3' ends of the deletion is well determined.

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La Talasemia-α es uno de los desórdenes de la hemoglobina más prevalences en el mundo. En el sureste de Asia, --SEA es el alelo más frecuente en pacientes con enfermedad por HbH (EHbH). En el presente trabajo se describen las características moleculares de tres pacientes con EHbH de dos familias mexicanas, y se analiza la secuencia de DNA del alelo --SEA, para determinar los sitios de ruptura. Los alelos -α3.7y --SEA se identificaron por un método de PCR modificado en nuestro laboratorio y los sitios de ruptura por secuenciación de DNA. Los tres pacientes con EHbH mostraron el genotipo -a3.7/--SEA. El alelo -α3.7 está ampliamente distribuido en el mundo, mientras que el alelo--SEA predomina en los países del sureste de Asia. El análisis de DNA del alelo--SEA mostró en 5' el sitio de ruptura en el codón 28 del pseudogén ψα2 y en 3', dentro de la secuencia Alu-Jo, localizada a 1,328 nucleótidos de la región HVR3', lo que da un segmento delecionado de 19,303 nucleótidos. Éste es el primer reporte en el que se analizan los sitios que flanquean la deleción del alelo --SEA en pacientes mexicanos y se definen con precisión los extremos 5' y 3' de la deleción.

Asunto(s)

Niño , Femenino , Humanos , Masculino , Hemoglobina H/genética , Talasemia alfa/genética , Alelos , Análisis Mutacional de ADN , México , Reacción en Cadena de la Polimerasa

RESUMEN

We describe a child with ATR-16 [alpha-thalassemia (thal)/mental retardation], who was referred for genetic evaluation because of minor anomalies and developmental delay. Cytogenetic analysis demonstrated a de novo complex rearrangement of chromosome 16. Fluorescence in situ hybridization (FISH) analysis, using chromosome 16 subtelomeric probes, showed that this patient had a deletion of the distal short arm of chromosome 16 that contains the alpha-globin genes and a duplication of 16q. Analysis of the alpha-globin locus by Southern blot showed a half normal dose of the alpha-globin gene. Microsatellite marker studies revealed that the duplicated 16q region was maternal in origin. Hematological studies revealed anemia, hypochromia and occasional cells with Hb H inclusion bodies. A hematological screening for alpha-thal should be considered in patients with mild developmental delay and a suggestive phenotype of ATR-16 with microcytic hypochromic anemia and normal iron status. The stellate pattern of the iris, a new finding in our patient, may contribute to a better clinical delineation of both syndromes, ATR-16 and/or duplication of 16qter.

Asunto(s)

Aberraciones Cromosómicas , Cromosomas Humanos Par 16/genética , Discapacidad Intelectual/genética , Talasemia alfa/genética , Análisis Citogenético/métodos , Análisis Mutacional de ADN/métodos , Genotipo , Hemoglobina H/análisis , Hemoglobinas Anormales/genética , Humanos , Hibridación Fluorescente in Situ/métodos , Lactante , Discapacidad Intelectual/diagnóstico , Masculino , Mutación Puntual/genética , Eliminación de Secuencia , Talasemia alfa/diagnóstico

RESUMEN

CONTEXTO: O prognóstico da anemia aplástica grave melhorou com o advento do transplante de medula óssea e do tratamento imunossupressor com globulina antitimocitária. Em contraste com o sucesso destes protocolos, os estudos com seguimento a longo prazo mostraram a ocorrência de doenças clonais, tais como: hemoglobinúria paroxística noturna, síndrome mielodisplásica e leucemia aguda. RELATO DE CASO: Nós relatamos o primeiro caso descrito no Brasil de um paciente com anemia aplástica que evoluiu para síndrome mielodisplásica e leucemia mielóide aguda associada a presença de hemoglobina H e aumento da hemoglobina fetal.

Asunto(s)

Humanos , Masculino , Adulto , Anemia Aplásica/complicaciones , Hemoglobina H , Leucemia Mieloide/etiología , Enfermedad Aguda , Anemia Aplásica/tratamiento farmacológico , Anemia Aplásica/cirugía , Suero Antilinfocítico/administración & dosificación , Suero Antilinfocítico/efectos adversos , Protocolos de Quimioterapia Combinada Antineoplásica/efectos adversos , Trasplante de Médula Ósea/efectos adversos , Resultado Fatal , Globinas/biosíntesis , Leucemia Mieloide/tratamiento farmacológico , Síndromes Mielodisplásicos/complicaciones , Factores de Tiempo

RESUMEN

CONTEXT: The prognosis of severe aplastic anemia has improved since the introduction of bone marrow transplantation and treatment with antithymocyte globulin. In contrast to the success of these protocols, studies with long term follow-up have shown the occurrence of clonal diseases such as paroxysmal nocturnal hemoglobinuria, myelodysplastic syndrome and acute leukemia in aplastic anemia. CASE REPORT: We report the first case of a Brazilian patient with aplastic anemia who developed myelodysplastic syndrome and acute myeloid leukemia showing acquired hemoglobin H and increased fetal hemoglobin.

Asunto(s)

Anemia Aplásica/complicaciones , Hemoglobina H , Leucemia Mieloide/etiología , Enfermedad Aguda , Adulto , Anemia Aplásica/sangre , Resultado Fatal , Humanos , Leucemia Mieloide/sangre , Masculino , Síndromes Mielodisplásicos/complicaciones , Factores de Tiempo

RESUMEN

The first case of haemoglobin H (HbH) disease in combination with haemoglobin C (HbC) is reported in a man of Surinamese origin. Only haemoglobin A (HbA) and HbC were detected by electrophoresis. The amount of HbC was much less than expected in HbC heterozygotes. The synthesis ratio (beta A+ beta C/alpha) indicated an alpha-thalassaemia defect with two non-functional alpha genes, which did not correlate with the degree of haemolysis and anaemia displayed by the patient. The DNA analysis of the alpha-genes clusters revealed a defect combination -SEA/-alpha 3.7. The haematological data and the physiopathology of this atypical case are compared with the typical HbH disease found in a first cousin of the propositus. Data on the globin chains expression and on the formation of beta A and beta C homotetramers in HbH/HbC disease are presented.

Asunto(s)

Eliminación de Gen , Hemoglobina H/genética , Hemoglobinopatías/genética , Heterocigoto , Adulto , Electroforesis en Gel de Almidón , Enfermedad de la Hemoglobina C/complicaciones , Enfermedad de la Hemoglobina C/genética , Hemoglobinopatías/complicaciones , Humanos , Masculino , Linaje , Talasemia alfa/complicaciones , Talasemia alfa/genética

RESUMEN

Os autores fazem um estudo da prevalência de hemoglobinopatias em doadores do Banco de Sangue do Hospital Universitário de Santa Maria - HUSM-, no período de maio/94 a agosto/94, acrescido de revisao bibliográfica sobre o assunto. Analisaram-se amostras de 500 doadores assintomáticos entre os quais foram detectados 6 portadores (1,2 por cento) de hemoglobinas anormais. Comprando-se esse achados com os daqueles relacionados às diferentes populaçoes mundiais, incluindo estudos com a populaçao brasileira, verificou-se semelhança no que tange aos tipos de hemoglobinopatias encontrados, embora a prevalência no grupo estudado tenha sido comparativamente menor.

Asunto(s)

Humanos , Talasemia alfa/epidemiología , Anemia de Células Falciformes/epidemiología , Bancos de Sangre , Donantes de Sangre , Hemoglobina H , Hemoglobina Falciforme , Hemoglobinopatías/epidemiología , Talasemia alfa/diagnóstico , Anemia de Células Falciformes/diagnóstico , Electroforesis en Gel de Agar , Electroforesis en Acetato de Celulosa , Hemoglobinopatías/diagnóstico , Microscopía , Prevalencia , Estudios Prospectivos

Asunto(s)

Aberraciones Cromosómicas/genética , Cromosomas Humanos/fisiología , Citogenética/tendencias , Hemoglobina H/genética

RESUMEN

A doenca por hemoglobina H (Hb H) e uma forma de alfa talassemia, caracterizada por baixa sintese de cadeia alfa e alta concentracao de cadeia beta; consequentemente a este desequilibrio ha formacao de tetrameros de cadeia beta ('beta IND.4'). A Hb H e relativamente comum na Tailandia e Grecia. Casos isolados tem sido relatados em chineses, filipinos e malasianos, confirmando que esta hemoglobina e frequente no Extremo Oriente; no Oriente Proximo sao relatados casos de Cipriota-grego e Arabe-jordaniano. Italia, Espanha, Canada, Indonesia e outros paises sao citados por terem apresentado casos de individuos portadores desta anomalia; no Brasil, foram publicados relatos de Hb H em familias de origens italiana, chinesa e negra. Nos identificamos a Hb H atraves de eletroforese, instabilidade e seus corpusculos caracteristicos.

Asunto(s)

Adulto , Humanos , Masculino , Hemoglobina H/análisis , Talasemia/diagnóstico , Etnicidad , Hemoglobinas Anormales/análisis

RESUMEN

Hemoglobin H (Hb H) disease is an alpha thalassemia form characterized by low synthesis of alpha chain and high beta chain concentration; this unbalance induces the beta chain tetramers formation. Hb H is relatively frequent in Thailand and Greece. Isolated cases have been reported in Chinese, Filipinos, Malaysians. In the Near East occasional cases were observed in Greek Cypriots and Jordanian Arabs. Hb H carriers were found in Italy, Spain, Canada, Indonesia and other countries. In Brazil there are descendants of Italians, Chinese and people of negro origin who are carriers of Hb H. We identified the Hb H by electrophoresis, instability and characteristic inclusion bodies.

Asunto(s)

Hemoglobina H/análisis , Talasemia alfa/diagnóstico , Adulto , Electroforesis en Acetato de Celulosa , Humanos , Masculino , Factores de Tiempo

RESUMEN

Foram analisados 60 pacientes portadores de doenças linfo e mieloproliferativas (DLMP) com o objetivo de determinar a prevalência da associaçäo com a talassemia alfa. A talassemia alfa foi diagnósticada pela presença de agregados intra-eritrocitários de Hb H. Os resultados mostraram que 46,6% dos portadores de DLPM têm talassemia alfa; no grupo controle, composto por pessoas aparentemente sadias, a prevalência de talassemia alfa foi de 3,9%

Asunto(s)

Niño , Adolescente , Adulto , Persona de Mediana Edad , Humanos , Masculino , Femenino , Preescolar , Hemoglobina H/análisis , Leucemia Linfoide/complicaciones , Leucemia Linfoide/complicaciones , Linfoma no Hodgkin/complicaciones , Talasemia/complicaciones