Molecular characterization of a human monoclonal antibody to B antigen in ABO blood type

Mika Kaneko, Yukinari Kato, Hidekazu Horiuchi, Motoki Osawa

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

A human anti-B antibody of clone BT97 was obtained from a healthy individual of type A of the ABO blood group without immunization. Cloning was performed by means of heterohybridoma formation of cell fusion between human peripheral lymphocytes and mouse myeloma cells. The antibody selectively reacted with B-antigen in flow cytometry using red blood cells and enzyme-linked immunosorbent assay. The VH and VL genes of BT97 were derived from the germline genes of DP-47 and 3p.81A4, respectively, with a couple of somatic mutational events. Comparative analysis with other reported anti-A, B and H antibodies revealed that the amino acid sequence of the VH region was more homologous than that of the VL region. The sequence of BT97 showed complete identity with one anti-H natural antibody reported by Marks et al., with the exception of the CDR3 region. It is not known whether the homologies include the common properties of the natural antibodies; however, a particular germline gene potentially changes to anti-ABH antibodies. We think that this method is suitable for cDNA preparation of human monoclonal antibodies to blood group antigens and for sequence analysis.

Original languageEnglish
Pages (from-to)45-51
Number of pages7
JournalImmunology Letters
Volume86
Issue number1
DOIs
Publication statusPublished - 2003 Mar 3
Externally publishedYes

Keywords

  • ABO histo-blood type
  • Heterohybridoma
  • Human monoclonal antibody
  • Natural antibody

ASJC Scopus subject areas

  • Immunology and Allergy
  • Immunology

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