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Compositional characteristics of human peripheral TRBV pseudogene rearrangements
Bin Shi1,2, Long Ma3, Xiaoyan He3
1Department of Laboratory Medicine, The first Affiliated Hospital of Zunyi Medical University, Zunyi, China.
Scientific Reports
|April 14, 2018
Summary
This study analyzes T cell receptor beta chain variable (TRBV) pseudogenes, revealing distinct compositional characteristics compared to functional genes. Understanding these pseudogene rearrangements offers new insights into T cell receptor diversity.
Area of Science:
- Immunology
- Molecular Biology
- Genetics
Background:
- T cell receptor (TCR) complementarity determining region 3 (CDR3) diversity arises from V(D)J recombination of germline gene fragments.
- Human TCR beta chain variable (TRBV) pseudogenes, though retained through evolution, are understudied compared to functional TRBV genes.
Purpose of the Study:
- To characterize the compositional features of TRBV pseudogene rearrangements.
- To compare TRBV pseudogenes with TRBV open reading frames (ORFs) and functional TRBV genes.
Main Methods:
- High-throughput sequencing of DNA from peripheral blood of healthy volunteers and patients.
- Comparative analysis of TRBV pseudogenes, TRBV ORFs, and functional TRBV genes.
Main Results:
- Identified significant differences in J and D gene usage between pseudogenes and functional/ORF genes.
- Observed distinct V gene deletion distribution profiles for pseudogenes compared to ORFs and functional genes.
- Found differential amino acid usage in CDR3 regions: pseudogenes favored arginine, lysine, and cysteine, while functional genes favored leucine.
Conclusions:
- Provides a comprehensive description of peripheral TRBV pseudogene rearrangement characteristics.
- Highlights significant compositional differences between TRBV pseudogenes and functional genes.
- Establishes a reference for future research into the role and characteristics of TRBV pseudogenes.
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