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Mota NO, Kimura EM, Ferreira RD, Pedroso GA, Albuquerque DM, Ribeiro DM, Santos MNN, Bittar CM, Costa FF, Sonati MDF. Rare α0-thalassemia deletions detected by MLPA in five unrelated Brazilian patients. Genet Mol Biol 2017; 40:768-773. [PMID: 28981562 PMCID: PMC5738609 DOI: 10.1590/1678-4685-gmb-2016-0330] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2016] [Accepted: 07/23/2017] [Indexed: 11/21/2022] Open
Abstract
Alpha-thalassemias are among the most common genetic diseases in the world. They are characterized by hypochromic and microcytic anemia and great clinical variability, ranging from a practically asymptomatic phenotype to severe anemia, which can lead to intrauterine or early neonatal death. Deletions affecting the α-globin genes, located on chromosome 16p13.3, are the main causes of α-thalassemia. Multiplex ligation-dependent probe amplification (MLPA) can be used to detect rearrangements that cause α-thalassemia, particularly large deletions involving the whole α cluster and/or deletions in the HS-40 region. Here, MLPA was used to investigate the molecular basis of α-thalassemia in five unrelated patients, three of whom had Hb H disease. In addition to the -α3.7 deletion identified in the patients with Hb H disease, four different α0 deletions removing 15 to 225 kb DNA segments were found: two of them remove both the α genes, one affects only the regulatory element (HS-40) region, and another one extends over the entire α cluster and the HS-40 region. These results illustrate the diversity of α-thalassemia deletions in the Brazilian population and highlight the importance of molecular investigation in cases that present with microcytosis and hypochromia without iron deficiency and normal or reduced Hb A2 levels..
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Affiliation(s)
- Natália O Mota
- Laboratório de Hemoglobinopatias, Departamento de Patologia Clínica, Faculdade de Ciências Médicas, Universidade Estadual de Campinas (UNICAMP), Campinas, SP, Brazil
| | - Elza M Kimura
- Laboratório de Hemoglobinopatias, Departamento de Patologia Clínica, Faculdade de Ciências Médicas, Universidade Estadual de Campinas (UNICAMP), Campinas, SP, Brazil
| | - Roberta D Ferreira
- Laboratório de Hemoglobinopatias, Departamento de Patologia Clínica, Faculdade de Ciências Médicas, Universidade Estadual de Campinas (UNICAMP), Campinas, SP, Brazil
| | - Gisele A Pedroso
- Laboratório de Hemoglobinopatias, Departamento de Patologia Clínica, Faculdade de Ciências Médicas, Universidade Estadual de Campinas (UNICAMP), Campinas, SP, Brazil
| | | | - Daniela M Ribeiro
- Laboratório de Hemoglobinopatias, Departamento de Patologia Clínica, Faculdade de Ciências Médicas, Universidade Estadual de Campinas (UNICAMP), Campinas, SP, Brazil
| | - Magnun N N Santos
- Laboratório de Hemoglobinopatias, Departamento de Patologia Clínica, Faculdade de Ciências Médicas, Universidade Estadual de Campinas (UNICAMP), Campinas, SP, Brazil
| | | | - Fernando F Costa
- Hemocentro, Universidade Estadual de Campinas (UNICAMP), Campinas, SP, Brazil
| | - Maria de Fatima Sonati
- Laboratório de Hemoglobinopatias, Departamento de Patologia Clínica, Faculdade de Ciências Médicas, Universidade Estadual de Campinas (UNICAMP), Campinas, SP, Brazil
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Suemasu C, Kimura E, Oliveira D, Bezerra M, Araújo A, Costa F, Sonati M. Characterization of alpha thalassemic genotypes by multiplex ligation-dependent probe amplification in the Brazilian population. Braz J Med Biol Res 2011; 44:16-22. [DOI: 10.1590/s0100-879x2010007500144] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2010] [Accepted: 12/03/2010] [Indexed: 11/22/2022] Open
Affiliation(s)
| | | | | | | | - A.S. Araújo
- Fundação de Hematologia e Hemoterapia de Pernambuco, Brasil
| | - F.F. Costa
- Universidade Estadual de Campinas, Brasil
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Dastidar R, Gajra B, De M. Molecular and Hematological Characterization of Hemoglobin H Disease in the Bengali Population of Kolkata, India. Genet Test Mol Biomarkers 2011; 15:93-6. [DOI: 10.1089/gtmb.2010.0062] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- Rinini Dastidar
- Vivekananda Institute of Medical Sciences, Ramakrisna Mission Seva Pratisthan, Kolkata, India
| | - Bani Gajra
- Vivekananda Institute of Medical Sciences, Ramakrisna Mission Seva Pratisthan, Kolkata, India
| | - Madhusnata De
- Vivekananda Institute of Medical Sciences, Ramakrisna Mission Seva Pratisthan, Kolkata, India
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