Precise Determination of the Diversity of a Combinatorial Antibody Library Gives Insight into the Human Immunoglobulin Repertoire
Overview
Authors
Affiliations
Antibody repertoire diversity, potentially as high as 10(11) unique molecules in a single individual, confounds characterization by conventional sequence analyses. In this study, we present a general method for assessing human antibody sequence diversity displayed on phage using massively parallel pyrosequencing, a novel application of Kabat column-labeled profile Hidden Markov Models, and translated complementarity determining region (CDR) capture-recapture analysis. Pyrosequencing of domain amplicon and RCA PCR products generated 1.5 x 10(6) reads, including more than 1.9 x 10(5) high quality, full-length sequences of antibody variable fragment (Fv) variable domains. Novel methods for germline and CDR classification and fine characterization of sequence diversity in the 6 CDRs are presented. Diverse germline contributions to the repertoire with random heavy and light chain pairing are observed. All germline families were found to be represented in 1.7 x 10(4) sequences obtained from repeated panning of the library. While the most variable CDR (CDR-H3) presents significant length and sequence variability, we find a substantial contribution to total diversity from somatically mutated germline encoded CDRs 1 and 2. Using a capture-recapture method, the total diversity of the antibody library obtained from a human donor Immunoglobulin M (IgM) pool was determined to be at least 3.5 x 10(10). The results provide insights into the role of IgM diversification, display library construction, and productive germline usages in antibody libraries and the humoral repertoire.
Development of an optimized cell-based selection system for phage display libraries.
Czarnecka M, Findik N, Schlor A, Hanack K Biol Methods Protoc. 2025; 10(1):bpaf009.
PMID: 39968222 PMC: 11835232. DOI: 10.1093/biomethods/bpaf009.
Single-cell analysis of cerebrospinal fluid reveals common features of neuroinflammation.
Jacobs B, Gasperi C, Kalluri S, Al-Najjar R, McKeon M, Else J Cell Rep Med. 2024; 6(1):101733.
PMID: 39708811 PMC: 11866449. DOI: 10.1016/j.xcrm.2024.101733.
Naylon S, Richaud A, Zhao G, Bui L, Dufresne C, Wu C RSC Chem Biol. 2024; .
PMID: 39552936 PMC: 11562385. DOI: 10.1039/d4cb00174e.
Camus V, Viennot M, Viailly P, Drieux F, Veresezan E, Bobee V Blood Adv. 2024; 9(1):101-115.
PMID: 39293080 PMC: 11742575. DOI: 10.1182/bloodadvances.2024013723.
De Novo Synthesis and Structural Elucidation of CDR-H3 Loop Mimics.
Zhao G, Richaud A, Williamson R, Feig M, Roche S ACS Chem Biol. 2024; 19(7):1583-1592.
PMID: 38916527 PMC: 11299430. DOI: 10.1021/acschembio.4c00236.