TY - JOUR
A1 - Soliman, Mohamed
A1 - El-Edel, Rawhia
A1 - AbdElhameed, Amal
A1 - Ragab, Seham
A1 - Mansour, Manal
A1 - Helwa, Mohamed
T1 - Genetic polymorphism of BCL11A (rs11886868) in Egyptian patients with β-thalassemia
Y1 - 2021/1/1
JF - Menoufia Medical Journal
JO - Menoufia Med J
SP - 305
EP - 309
VL - 34
IS - 1
UR - http://www.mmj.eg.net/article.asp?issn=1110-2098;year=2021;volume=34;issue=1;spage=305;epage=309;aulast=Soliman
DO - 10.4103/mmj.mmj_232_19
N2 -
Objectives
To study the effect of BCL11A (rs11886868) gene polymorphism on clinical status of Egyptian patients with β-thalassemia.
Background
β-thalassemia is a genetic disorder that results from β-globin gene mutations leading to defective synthesis of adult hemoglobin (Hb A). Clinical consequences vary tremendously from nearly asymptomatic to severely anemic and transfusion-dependent patients. Phenotypic variations have been linked not only to the type of β-globin gene mutations and amount of synthesized Hb A but also to recently discovered genetic modifiers mapping outside the β-globin gene cluster including BCL11A gene polymorphism. These modifiers are associated with increased fetal hemoglobin (Hb F) levels.
Patients and methods
Blood samples were collected from 120 patients with β-thalassemia before transfusion of blood. Complete blood count, quantitative measurement of different Hb types by high-performance liquid chromatography, and analysis of single nucleotide polymorphism rs11886868 in the BCL11A gene by Taqman single nucleotide polymorphism genotyping assay and real-time PCR were done.
Results
The genotype distribution of BCL11A gene polymorphism showed low frequency of CC genotype (15%) among Egyptian patients with β-thalassemia. The CT genotype was 41.7% and TT genotype was 43.3%. There was a significant relation between BCL11A (rs11886868) genotypes and Hb F levels, with the highest Hb F levels were observed in the CC genotype followed by CT genotype, whereas Hb F levels were the lowest in TT genotype. Patients with CC genotype had mild disease phenotype owing to increased Hb F production. Hb F utilizes some of the free α-chain and ameliorates clinical presentation.
Conclusion
Screening of BCL11A gene variants may be used as a marker for severity risk in newly diagnosed patients with β-thalassemia and as a predictor of clinical outcome of this disorder.
ER -