Combining genotypes and T cell receptor distributions to infer genetic loci determining V(D)J recombination probabilities

• Published in: eLife Vol. 11
• Main Authors: Russell, Magdalena L, Souquette, Aisha, Levine, David M, Schattgen, Stefan A, Allen, E Kaitlynn, Kuan, Guillermina, Simon, Noah, Balmaseda, Angel, Gordon, Aubree, Thomas, Paul G, Matsen, Frederick A, Bradley, Philip
• Format: Journal Article
• Language: English
• Published: England eLife Sciences Publications Ltd 22.03.2022; eLife Sciences Publications, Ltd
• Subjects: Antigens; Artemis; Artemis protein; Chromosomes; DNA nucleotidylexotransferase; Gene deletion; Gene loci; Genetic diversity; Genetic Loci; Genome-Wide Association Study; Genomes; Genotype; Genotypes; Genotyping; GWAS; Humans; Immunology and Inflammation; Insertion; J gene; Lymphocytes; Lymphocytes T; Major histocompatibility complex; Peptides; Probability; Proteins; Receptors, Antigen, T-Cell - genetics; t cell receptor repertoire; T cell receptors; TdT; Thymus gland; V(D)J recombination; V(D)J Recombination - genetics; VDJ recombination probabilities; GWAS; TdT; inflammation; Artemis; t cell receptor repertoire; VDJ recombination probabilities; human; immunology
• ISSN: 2050-084X; 2050-084X
• DOI: 10.7554/eLife.73475

Every T cell receptor (TCR) repertoire is shaped by a complex probabilistic tangle of genetically determined biases and immune exposures. T cells combine a random V(D)J recombination process with a selection process to generate highly diverse and functional TCRs. The extent to which an individual’s genetic background is associated with their resulting TCR repertoire diversity has yet to be fully explored. Using a previously published repertoire sequencing dataset paired with high-resolution genome-wide genotyping from a large human cohort, we infer specific genetic loci associated with V(D)J recombination probabilities using genome-wide association inference. We show that V(D)J gene usage profiles are associated with variation in the TCRB locus and, specifically for the functional TCR repertoire, variation in the major histocompatibility complex locus. Further, we identify specific variations in the genes encoding the Artemis protein and the TdT protein to be associated with biasing junctional nucleotide deletion and N-insertion, respectively. These results refine our understanding of genetically-determined TCR repertoire biases by confirming and extending previous studies on the genetic determinants of V(D)J gene usage and providing the first examples of trans genetic variants which are associated with modifying junctional diversity. Together, these insights lay the groundwork for further explorations into how immune responses vary between individuals.