Sequencing and cloning of antigen specific antibodies from mouse memory B cells
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.
Nature Protocols