Abstract |
Hemoglobin ( Hb) A2 (alpha2delta2) is a minor hemoglobin in human red blood cells. An abnormal increase in the level of HbA2 is the most significant parameter in the diagnosis of beta-thalassemia carriers. In this study, we produced two monoclonal antibodies (mAbs) that specifically react to the delta-globin chain of HbA2. A sandwich type ELISA was developed employing the produced anti-HbA2 mAbs. HbA2 levels quantified by the developed sandwich ELISA were highly correlated with those obtained from the standard HPLC method (r = 0.934, p < 0.001). HbA2 levels determined by the ELISA were 4.4 +/- 1.9% in beta-thalassemia heterozygotes compared to 1.4 +/- 0.8, 1.9 +/- 0.8, 1.5 +/- 0.8 and 1.5 +/- 0.6% in normal subjects, HbE heterozygotes, suspected alpha-thalassemia heterozygotes and HbE homozygotes, respectively. Using a cut-off value of 2.5%, beta-thalassemia heterozygotes could be separated from non- beta-thalassemia heterozygotes with the same accuracy as obtained using the standard HPLC method. More importantly, the developed ELISA was able to determine HbA2 levels in HbE-bearing individuals which could not be done by the HPLC method. Our results suggest that this sandwich ELISA can be applied for mass screening for beta-thalassemia heterozygotes, especially in resource-limited countries, where beta-thalassemia is highly prevalent.
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Authors | Surakit Kuntaruk, Thanusak Tatu, Tiemjan Keowkarnkah, Watchara Kasinrerk |
Journal | International journal of hematology
(Int J Hematol)
Vol. 91
Issue 2
Pg. 219-28
(Mar 2010)
ISSN: 1865-3774 [Electronic] Japan |
PMID | 20066573
(Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
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Chemical References |
- Antibodies, Monoclonal
- Hemoglobin A2
- Hemoglobin E
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Topics |
- Adult
- Animals
- Antibodies, Monoclonal
(immunology)
- Antibody Specificity
- Enzyme-Linked Immunosorbent Assay
(methods, standards)
- Hemoglobin A2
(genetics, immunology, metabolism)
- Hemoglobin E
(immunology, metabolism)
- Heterozygote
- Homozygote
- Humans
- Immunization
- Mass Screening
(methods, standards)
- Mice
- Mice, Inbred BALB C
- Reproducibility of Results
- alpha-Thalassemia
(blood, diagnosis)
- beta-Thalassemia
(blood, diagnosis)
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