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:
a) obtaining antibody heavy chain sequences and antibody light chain sequences from a population of B cells of an animal, wherein said population of B cells comprises B cells that produce antibodies that specifically bind to a target antigen;
b) grouping the antibodies based on their lineage to provide a plurality of groups of antibodies, wherein the antibodies in each group have heavy chain CDR3 regions that have 0, 1 or 2 amino acid substitutions relative to one another and light chain CDR3 regions that have 0, 1 or 2 amino acid substitutions relative to one another;
c) testing a single antibody from each group of a plurality of the groups of b) in a first assay to identify a first antibody that has an activity; and, after said first antibody has been identified:
d) testing a further antibody that is in the same group as the first antibody in a second assay, thereby identifying a second antibody that has said activity.
2. The method of claim 1 , wherein step a) comprises obtaining at least 1,000 heavy chain sequences and at least 1,000 light chain sequences from said population of B cells.
3. The method of claim 1 , wherein said population of B cells is enriched by affinity for a substrate comprising said target antigen.
4. The method of claim 1 , wherein each of said groups of antibodies comprises at least two members.
5. The method of claim 1 , wherein said single antibody from each of said groups comprises naturally paired heavy chain and light chain variable domains.
6. The method of claim 1 , wherein said single antibody from each of said groups comprises non-naturally paired heavy chain and light chain variable domains.
7. The method of claim 1 , wherein said further antibodies comprise naturally paired heavy and light chain variable domains.
8. The method of claim 1 , wherein said further antibodies comprise non-naturally paired heavy and light chain variable domains.
9. The method of claim 1 , wherein said first and second assays are the same.
10. The method of claim 1 , wherein said first and second assays are selected from the group consisting of a blocking assay and a neutralization assay.
11. The method of claim 1 , wherein said animal is immunized with said antigen prior to said obtaining step a).
12. The method of claim 1 , wherein the animal is a rabbit.
13. The method of claim 1 , wherein the antibodies within each of said groups are related to one another by lineage and comprise heavy chain CDR3 regions that have 0 amino acid substitutions relative to one another and light chain CDR3 regions that have 0 amino acid substitutions relative to one another.