Method for identifying lineage-related antibodies
In certain embodiments, the method may comprise: a) obtaining the antibody sequences from a population of B cells; b) grouping the antibody sequences to provide a plurality of groups of lineage-related antibodies; c) testing a single antibody from each of the groups in a bioassay and, after the first antibody has been identified, d) testing further antibodies that are in the same group as the first antibody in a second bioassay. In another embodiment, the method may comprise: a) testing a plurality of antibodies obtained from a first portion of an antibody producing organ of an animal; b) obtaining the sequence of a first identified antibody; c) obtaining from a second portion of said antibody producing organ the sequences of further antibodies that are related by lineage to said first antibody; and, c) testing the further antibodies in a second bioassay.
1. A method comprising:
obtaining the amino acid sequences of at least the CDR3 regions of a plurality of immunoglobulin heavy chains and a plurality of immunoglobulin light chains from an individual that has been immunized with an antigen;
grouping said immunoglobulin heavy chain sequences so that immunoglobulin heavy chain sequences within each group are related to one another by lineage, wherein said grouping the immunoglobulin heavy chain sequences comprises comparing the heavy chain CDR3 sequences to one another and wherein the immunoglobulin heavy chains within each group have the same heavy chain CDR3 amino acid sequence and the different groups contain heavy chains that have different heavy chain CDR3 amino acid sequences;
grouping said immunoglobulin light chains sequences so that immunoglobulin light chain sequences within each group are related to one another by lineage, wherein said grouping the immunoglobulin light chain sequences comprises comparing the heavy chain CDR3 sequences to one another and wherein the immunoglobulin light chains within each group have the same light chain CDR3 amino acid sequence and the different groups contain light chains that have different light chain CDR3 amino acid sequences;
selecting a single heavy chain from each of a plurality of the heavy chain groups and a single light chain from each of a plurality of the light chain groups to produce a plurality of candidate heavy chains and a plurality of candidate light chains; and
testing said candidate heavy chains and said candidate light chains in a pairwise manner for binding to said antigen.
2. The method of claim 1 , wherein said obtaining comprises obtaining at least 1,000 heavy chain CDR3 sequences and at least 1,000 light chain CDR3 sequences from a population of antibody-producing cells obtained from said individual.
3. The method of claim 1 , further comprising identifying an antibody that binds to said antigen.
4. The method of claim 3 , wherein the identified antibody has non-naturally paired heavy and light chains.
5. The method of claim 1 , wherein the individual is a mouse.
6. The method of claim 1 , wherein the individual is a rabbit.
7. The method of claim 1 , wherein said obtaining is done by sequencing cDNA encoding said immunoglobulin heavy chains and said immunoglobulin light chains.
8. The method of claim 1 , wherein said obtaining comprises amplifying polynucleotides encoding said immunoglobulin heavy chains and said immunoglobulin light chains from cDNA using universal primers, and then sequencing said polynucleotides.
9. The method of claim 1 , wherein said immunoglobulin heavy and light chains are from antibodies that are enriched.
10. The method of claim 1 , wherein said testing comprises systematically testing all of said candidate heavy chains and all of said candidate light chains in a pairwise manner to identify an antibody that binds to said antigen.
11. The method of claim 1 , wherein said testing is done by ELISA.
12. The method of claim 1 , wherein said testing is done using a blocking assay or a neutralization assay.
13. The method of claim 1 , wherein said selecting comprises selecting a single heavy chain from each of at least 20% of the heavy chain groups selecting a single light chain from each of at least 20% of the light chain groups.
14. The method of claim 1 , wherein said selecting comprises selecting a single heavy chain from each of at least 80% of the heavy chain groups selecting a single light chain from each of at least 80% of the light chain groups.