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In search of genetic alterations responsible for high fetal hemoglobin (Hb F) phenotypes in the population of eastern India, 91 probands were screened for four polymorphisms by sequencing and/or restriction fragment length polymorphism (RFLP) analysis. These are the A>G allele on the rs4895441 locus in the intergenic region between HBS1L and MYB on chromosome 6, the G>A allele on the rs4671393 locus on chromosome 2 (BCL11A gene), the A>C allele on the rs2071348 (HBBP1 gene) and the XmnI polymorphism (rs7482144, -158 position of HBG2) on chromosome 11. We found a significant association (p = 0.002 and 0.0013) of Hb F levels with rs2071348 and rs4895441, respectively. However, the polymorphism rs4671393 gene did not show significant association with Hb F levels (p = 0.0655). As is well known, the XmnI polymorphism (p <0.0001) showed the strongest association.
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http://dx.doi.org/10.3109/03630269.2012.735626 | DOI Listing |
Br J Biomed Sci
July 2025
Department of Life Sciences and Biotechnology, University of Ferrara, Ferrara, Italy.
Introduction: The β-thalassemias are inherited genetic disorders affecting the hematopoietic system and caused by mutations of the adult β-globin gene, leading to low or absent production of adult hemoglobin. In addition, an excess of free α-globin is associated with ineffective erythropoiesis. In fact, the free α-globin molecules are prone to precipitate, causing toxicity to the erythroid cells, and interference with red cell maturation.
View Article and Find Full Text PDFFront Biosci (Schol Ed)
June 2025
Centro de Investigação em Antropologia e Saúde (CIAS), Universidade de Coimbra, 3000 Coimbra, Portugal.
Background: While an increase in fetal hemoglobin (HbF) has no consequences in healthy adults, clinical benefits can be promoted in sickle cell disease (SCD) and β-thalassemia patients. Single-nucleotide polymorphisms (SNPs) in three genomic regions: the gene cluster, the gene, and the () intergenic region, have been associated with HbF regulation. Therefore, the present study aimed to examine the potential association of SNPs in (rs11886868 and rs1427407), (rs66650371 and rs4895441), (rs7482144), and (rs7924684) with HbF levels in an adult population sample from São Tomé e Príncipe (Central Africa).
View Article and Find Full Text PDFFront Med (Lausanne)
February 2025
Servicio de Hematología y Hemoterapia, Hospital Clínico San Carlos, Madrid, Spain.
Objective/background: Sickle cell disease (SCD) is a monogenic disease with a highly variable phenotype depending on the amount of fetal hemoglobin (HbF), the main modulator. Variation of HbF levels among patients is genetically regulated. HbF determines both the phenotype of the disease and the response to treatment with the main drug used, hydroxyurea.
View Article and Find Full Text PDFHemoglobin
January 2025
Department of Biomedical and Science Therapeutic, Faculty of Medicine and Health Sciences, Universiti Malaysia Sabah, Kota Kinabalu, Malaysia.
Sabah has the highest prevalence of β-thalassemia in Malaysia, with the Filipino β-deletion as the predominant mutation. Patients with the homozygous Filipino β-deletion exhibit phenotypic heterogeneity due to various genetic modifiers, yet the effects of these modifiers on the clinical phenotype remain poorly understood. This study investigated the effects of the coinheritance of α-thalassemia, I-γ rs7482144, rs766432, and 5'HS4 rs16912979 polymorphisms on the clinical phenotype of homozygous Filipino β-deletion patients in Sabah.
View Article and Find Full Text PDFCell Mol Biol (Noisy-le-grand)
July 2024
Genetics Research Center, University of Social Welfare and Rehabilitation Sciences, Tehran, Iran.
The XmnI Gg -158 C/T polymorphism has been widely associated with fetal hemoglobin (HbF) levels, the severity of disease, and the response to the drug hydroxyurea (HU) in both β-thalassemia (β-thal) and sickle cell disease (SCD) patients. However, the functional significance of this single nucleotide polymorphism (SNP) remains unclear. To gain insight, green fluorescence protein (GFP) cassettes harboring the XmnI C or T alleles in their left homology arms (i.
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