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Updated: Sep 9, 2025

VDJ-Seq: Deep Sequencing Analysis of Rearranged Immunoglobulin Heavy Chain Gene to Reveal Clonal Evolution Patterns of B Cell Lymphoma

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Comparative analysis of CDR3 length-dependent patterns in VHHs.

Lu Zhang¹, Tianyu Yang¹, Yao Zhang¹

¹Drug Discovery and Development, Shanghai Cell Therapy Group Co. Ltd., Shanghai, China.

Frontiers in Immunology

|September 2, 2025

Summary

Variable domain of heavy chains (VHHs) CDR3 length impacts their sequence, structure, and antigen binding. Species-specific differences were observed, informing nanobody engineering for targeted therapeutics.

Keywords:

CDR3 CDR3 length VHH VHH-Ag interaction epitope nanobody paratope single-domain antibody

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Published on: December 1, 2011

Area of Science:

Biotechnology
Immunology
Structural Biology

Background:

Variable domain of heavy chains (VHHs), also known as nanobodies, are single-domain antibody fragments recognized for their stability and specific epitope targeting.
The complementarity-determining region 3 (CDR3) of VHHs is critical for antigen binding and exhibits substantial diversity across species.

Purpose of the Study:

To systematically investigate the relationship between CDR3 length and VHH characteristics.
To identify species-specific patterns in CDR3 length distribution and its impact on VHH sequence, structure, and antigen interactions.

Main Methods:

Analysis of next-generation sequencing (NGS) data from PBMCs of Alpacas, Llamas, and Bactrian camels.
Integration of VHH structural data from public databases.
Correlation analysis of CDR3 length with sequence, structural, and antigen interaction features.

Main Results:

Alpaca and Llama VHHs showed similar CDR3 length distributions, distinct from Bactrian VHHs, which had longer, narrower distributions.
Longer CDR3s were associated with lower net charge, reduced hydrophobicity, and increased interactions with other VHH regions.
Structural analysis revealed longer CDR3s adopted bent conformations with helical/coil structures, while shorter CDR3s favored extended conformations and β-sheets, with species-specific variations observed.

Conclusions:

CDR3 length is a significant determinant of VHH sequence, structure, and antigen-binding properties.
Findings provide valuable insights for VHH engineering, synthetic library design, and the development of targeted nanobody therapeutics.