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VDJ-Seq: Deep Sequencing Analysis of Rearranged Immunoglobulin Heavy Chain Gene to Reveal Clonal Evolution Patterns of B Cell Lymphoma
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RAG2 abolishes RAG1 aggregation to facilitate V(D)J recombination.
Tingting Gan1, Yuhong Wang1, Yang Liu1
1The MOE Key Laboratory of Cell Proliferation and Differentiation, School of Life Sciences, Peking-Tsinghua Center for Life Sciences, Peking University, Beijing 100871, China.
Cell Reports
|October 13, 2021
Summary
Recombination-activating gene 1 (RAG1) protein aggregates without RAG2, hindering V(D)J recombination. RAG2 binding disrupts these aggregates, activating the process and generating diverse antigen receptors.
Area of Science:
- Immunology
- Molecular Biology
- Genetics
Background:
- V(D)J recombination is crucial for adaptive immunity, enabling the generation of diverse antigen receptors in T and B lymphocytes.
- The RAG1 and RAG2 proteins form a complex essential for initiating V(D)J recombination.
- RAG1, originating from a transposon, possesses nuclease activity contingent on interaction with RAG2.
Purpose of the Study:
- To investigate the role of RAG2 in regulating RAG1 activity and V(D)J recombination.
- To elucidate the mechanism by which RAG1 and RAG2 interact to modulate recombination efficiency.
- To explore potential species-specific interactions between RAG1 and RAG2.
Main Methods:
- Nuclear localization and aggregation of human RAG1 and RAG2 were assessed in the absence and presence of each other.
- V(D)J recombination activity was measured under different RAG1/RAG2 expression conditions.
- Cross-species interaction studies were performed using RAG2 from mouse and zebrafish with human RAG1.
Main Results:
- Human RAG1 forms nuclear aggregates with significantly reduced V(D)J recombination activity in the absence of RAG2.
- RAG2 prevents RAG1 aggregation and robustly activates V(D)J recombination upon interaction.
- Human RAG2 is more efficient at disrupting human RAG1 aggregates than mouse or zebrafish RAG2, indicating species-specific regulation.
Conclusions:
- RAG2 acts as a crucial regulator by preventing RAG1 auto-aggregation and activating V(D)J recombination.
- The interaction between RAG1 and RAG2 is essential for efficient V(D)J recombination initiation.
- Species-specific co-evolution of RAG1 and RAG2 ensures proper regulation of adaptive immune receptor diversity.
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