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Sequencing and cloning of antigen-specific antibodies from mouse memory B cells

Abstract

Methods to identify genes encoding immunoglobulin heavy and light chains from single B lymphocytes vary in efficiency, error rate and practicability. Here we describe a protocol to sequence and clone the variable antibody region of single antigen-specific mouse memory B cells for antibody production. After purification, antigen-specific mouse memory B cells are first single-cell-sorted by fluorescence-activated cell sorting (FACS), and V(D)J transcripts are amplified by RT-PCR. Fragments are then combined with linearized expression vectors, assembled in vitro as part of a sequence- and ligation-independent cloning (SLIC) reaction and then transformed into Escherichia coli. Purified vectors can then be used to produce monoclonal antibodies in HEK293E suspension cells. This protocol improves the amplification efficiency of antibody variable genes and accelerates the cloning workflow. Antibody sequences will be available in 3–4 d, and microgram to milligram amounts of antibodies are produced within 14 d. The new protocol should be useful for addressing fundamental questions about antigen-specific memory B cell responses, as well as for characterizing antigen-specific antibodies.

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Figure 1: Schematic representation of the steps from antigen-specific memory B cell single-cell sorting to antibody purification.
Figure 2: Gating strategy for the identification of antigen-specific memory B cells.

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Acknowledgements

We thank K. Velinzon and N. Thomas for assistance with single-cell FACS and Z. Jankovic for laboratory support. This work was supported by grants to M.C.N. from US National Institutes of Health (NIH) Center for HIV/AIDS Vaccine Immunology and Immunogen Discovery (CHAVI-ID) UM1 AI100663, Bill and Melinda Gates Foundation (grant OPP1033115), NIH (grants AI037526 and U19 AI109632) and HIVRAD/P01 AI100148. L.v.B. is supported by grant no. UL1 TR000043 from the National Center for Advancing Translational Sciences (NCATS), NIH Clinical and Translational Science Award (CTSA) program. A.D.G. is supported by MSTP grant T32GM07739 to the Weill Cornell/Rockefeller/Sloan-Kettering Tri-Institutional MD-PhD Program. M.C.N. is a Howard Hughes Medical Institute Investigator. We thank members of the Nussenzweig and Ravetch laboratory for critical reading and helpful comments on the manuscript.

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Contributions

L.v.B. designed the experiments; L.v.B. and M.C.N. wrote the manuscript; L.v.B., C.L. and S.A. performed the experiments; A.D.G., Q.W., A.G. and all other authors critically read the manuscript and contributed to the manuscript preparation.

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Correspondence to Lotta von Boehmer.

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The authors declare no competing financial interests.

Integrated supplementary information

Supplementary Figure 1 Agarose gel electrophoresis of single cell sorted IgG1+ PE specific memory B cells amplified with gamma chain specific primers

Cells were reverse transcribed with random primers. The 1st PCR was performed with the primers 1mFH_I – 1mFH_XI and 1mRG, primers for the nested sequencing PCR are indicated in Table 1. First two rows are from plate 1 with 51% (49/56 positive wells) amplification efficiency, rows 3 and 4 are from plate 2 with 59% (57/96 positive wells) amplification efficiency. Experiments were performed according to the protocols approved by the IACUC at Rockefeller University.

Supplementary information

Supplementary Table 1

Primers for first and sequencing PCR. (XLSX 32 kb)

Supplementary Table 2

Primers for cloning PCR. (PDF 215 kb)

Supplementary text and figures

Supplementary Figure 1. (PDF 238 kb)

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von Boehmer, L., Liu, C., Ackerman, S. et al. Sequencing and cloning of antigen-specific antibodies from mouse memory B cells. Nat Protoc 11, 1908–1923 (2016). https://doi.org/10.1038/nprot.2016.102

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