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Abedini SS, Forouzesh Pour F, Karimi K, Ghaderi Z, Farashi S, Tavakoli Koudehi A, Javadi Pirouz H, Mobini Nejad SB, Azarkeivan A, Najmabadi H. Frequency of α-Globin Gene Triplications and Coinheritance with β-Globin Gene Mutations in the Iranian Population. Hemoglobin 2018; 42:252-256. [PMID: 30451045 DOI: 10.1080/03630269.2018.1526192] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Numerical variation in α-globin genes is very important due to their roles as an effective factor for phenotype presentation. An unequal crossover from misalignment of a homologous sequence of an α-globin gene during meiosis can produce a numerical alteration. A single α-globin gene deletion is the most frequent mutation in α-thalassemia (α-thal) worldwide, while the additional α-globin chain is relatively common. The excess α-globin gene plays a critical role in pathophysiology of thalassemia, especially when in coinherited with β-thalassemia (β-thal). α-Globin triplication leads to an imbalanced ratio between α- and β-globin chains, thus, it can exacerbate the clinical and hematological features of β-thal. Different studies have been performed in various countries to determine the frequency of α-globin triplication and its genotype-phenotype correlation with β-thal. In this study, we focused on the frequency of α-globin gene triplication and its characterization, either solely or in coexistence with β-globin gene mutations in Iranian populations. We have investigated the α-globin gene rearrangements in 4010 individuals from different provinces of Iran with normal to abnormal hematological parameters. In total, the frequency of the αααanti 3.7 triplication was 1.7% and phenotype aggravation was observed in α-globin triplication patients who were carriers of β-thal. Therefore, identification of genotype-phenotype correlation of α-globin triplication with β-thal can be very useful for predicting the severity of clinical manifestations during genetic counseling.
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Affiliation(s)
- Seyedeh Sedigheh Abedini
- a Genetics Research Center, University of Social Welfare and Rehabilitation Sciences , Tehran , Iran
| | | | - Keyvan Karimi
- b Kariminejad-Najmabadi Pathology & Genetics Center , Tehran , Iran
| | - Zhila Ghaderi
- b Kariminejad-Najmabadi Pathology & Genetics Center , Tehran , Iran
| | - Samaneh Farashi
- a Genetics Research Center, University of Social Welfare and Rehabilitation Sciences , Tehran , Iran.,b Kariminejad-Najmabadi Pathology & Genetics Center , Tehran , Iran
| | | | | | | | - Azita Azarkeivan
- b Kariminejad-Najmabadi Pathology & Genetics Center , Tehran , Iran.,c Department of Thalassemia Clinic , Transfusion Research Center Organization, High Institute for Research and Education in Transfusion Medicine , Tehran , Iran
| | - Hossein Najmabadi
- a Genetics Research Center, University of Social Welfare and Rehabilitation Sciences , Tehran , Iran.,b Kariminejad-Najmabadi Pathology & Genetics Center , Tehran , Iran
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