High-resolution analysis of the B cell repertoire before and after polyethylene glycol fusion reveals preferential fusion of rare antigen-specific B cells

Article type: Research Article

Authors: Dubois, Axel R.S.X. | Buerckert, Jean-Philippe | Sinner, Regina | Faison, William J. | Molitor, Anne M. | Muller, Claude P.^*

Affiliations: WHO-EURO Regional Reference Laboratory for Measles and Rubella, Luxembourg Institute of Health (former Centre de Recherche Public de la Santé), Esch-Sur-Alzette, Grand-Duchy of Luxembourg

Correspondence: [*] Corresponding author: Claude P. Muller, WHO-EURO Regional Reference Laboratory for Measles and Rubella, Luxembourg Institute of Health (former Centre de Recherche Public de la Santé), Esch-Sur-Alzette, Grand-Duchy of Luxembourg. Tel.: +352 26970 620; Fax: +352 490 686; E-mail:claude.muller@lih.lu

Abstract: OBJECTIVE: The hybridoma technology is one of the most important advances in clinical immunology. Little is known about the differences between the antibodies produced during the in vivo immune response and those recovered in hybridoma libraries. Here, we investigate a potential fusion bias inherent to the hybridoma production process. METHODS: Transgenic rats carrying human Ig heavy and light chain loci were immunized with measles virus (MV) to generate human mAbs. Usin g high-throughput sequencing of IgH mRNA, we compared the IgH repertoire of lymph nodes and the derived hybridoma library using the sequences of the MV-specific hybridoma clones as a reference set with known specificity. RESULTS: We observed that large clonotypes from the lymph nodes were not represented in the hybridoma library, but low-frequency B cell populations became highly enriched and most hybridoma clones were derived from these. Our data also showed that identical CDR3s evolved from diverse VDJ recombinations, indicating convergence of different B cells subpopulations towards expression of antibodies with similar paratopes. CONCLUSION: The efficient generation of mAbs results from a fusion process highly selective for rare antigen-specific B cells rather than in vivo expanded populations. Antibodies of particular interest may therefore be missed during classical hybridoma production.

Keywords: Hybridoma, lymph nodes, polyethylene glycol, transgenic animals, B cell repertoire, measles virus, next-generation sequencing, immunoglobulin

DOI: 10.3233/HAB-150288

Journal: Human Antibodies, vol. 24, no. 1-2, pp. 1-15, 2016