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V(D)J Rearrangement Is Dispensable for Producing CDR-H3 Sequence Diversity in a Gene Converting Species.
Philip A Leighton1, Jacqueline Morales1, William D Harriman1
1Ligand Pharmaceuticals, Emeryville, CA, United States.
Chicken antibody repertoires rely on a single framework, with diversity generated by gene conversion and somatic hypermutation. This study compares diversity from gene conversion alone versus V(D)J rearrangement plus gene conversion.
Area of Science:
- Immunology
- Molecular Biology
- Genetics
Background:
- Chicken antibody repertoires utilize a single framework, with diversity primarily in complementarity-determining regions (CDRs).
- Despite this, chickens can generate high-affinity antibodies against diverse and conserved targets.
- Transgenic chickens with humanized antibody repertoires use gene conversion for diversity, mimicking wild-type chickens.
Purpose of the Study:
- To compare antibody diversity generated by gene conversion/somatic hypermutation alone versus V(D)J rearrangement followed by these processes.
- To analyze the impact of different diversification mechanisms on antibody sequences and characteristics.
Main Methods:
- Comparative sequence analysis of antibody variable regions.
- Assessment of diversity generated through gene conversion/somatic hypermutation versus V(D)J rearrangement combined with these mechanisms.
- Analysis of complementarity-determining region 3 (CDR-H3) length variability.
Main Results:
- Antibody diversity can be achieved through gene conversion and somatic hypermutation alone, without V(D)J rearrangement.
- V(D)J rearrangement introduces greater variability in CDR-H3 lengths in gene-converting species.
- Similar levels of amino acid diversity are attainable using either gene conversion/somatic hypermutation alone or in combination with V(D)J rearrangement.
Conclusions:
- Chicken antibody diversification mechanisms, including gene conversion and somatic hypermutation, are highly effective.
- V(D)J rearrangement is not essential for generating substantial antibody diversity in gene-converting species.
- Understanding these mechanisms is crucial for antibody engineering and therapeutic development.
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