Application of a monoclonal antibody specific for the delta chain of hemoglobin A2 in the diagnosis of beta thalassemia.

Abstract:

:We have developed a murine monoclonal antibody (mAb) specific for the delta chain of hemoglobin (Hb) A2 that does not cross-react with alpha, beta, or gamma chains. The mAb reacted with Hb P-Nilotic (beta delta hybrid), but not with Hb Lepore-Boston (delta beta hybrid), indicating an epitope consisting of positions 116 (Arg) and 117 (Asn) or 125 (Gln) and 126 (Met) of the delta chain. By using this antibody, we have established a simple and rapid enzyme-linked immunosorbent assay (ELISA) for the detection and quantification of Hb A2 in adult, cord, and fetal hemolysates. We analyzed 70 adult, 8 newborn, and 19 fetal hemolysates from normal subjects and those with various hemoglobinopathies. The mean percentage of Hb A2 was 2.5 for normal adults, 5.4 for beta thalassemic (beta thal) heterozygotes, and less than 0.1% in beta thal fetal samples. We were able to distinguish and characterize certain phenotypes of beta thal patients such as beta thal heterozygotes, beta 0 thal homozygotes, and C beta 0 thal, and C beta + thal double heterozygotes with the aid of this and other mAbs we have generated. This technique is a valuable addition to current methods for the diagnosis of beta thal based on quantification of Hb A2.

journal_name

Am J Hematol

authors

Shyamala M,Kiefer CR,Moscoso H,Garver FA

doi

10.1002/ajh.2830380311

subject

Has Abstract

pub_date

1991-11-01 00:00:00

pages

214-9

issue

3

eissn

0361-8609

issn

1096-8652

journal_volume

38

pub_type

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