Three-way contact analysis characterizes the higher order organization of the Tcra locus.

Ranran Dai, Yongchang Zhu, Zhaoqiang Li, Litao Qin, Nan Liu, Shixiu Liao, Bingtao Hao

Nucleic acids research 2023 Sep 22

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The generation of highly diverse antigen receptors in T and B lymphocytes relies on V(D)J recombination. The enhancer Eα has been implicated in regulating the accessibility of Vα and Jα genes through long-range interactions during rearrangements of the T-cell antigen receptor gene Tcra. However, direct evidence for Eα physically mediating the interaction of Vα and Jα genes is still lacking. In this study, we utilized the 3C-HTGTS assay, a chromatin interaction technique based on 3C, to analyze the higher order chromatin structure of the Tcra locus. Our analysis revealed the presence of sufficient information in the 3C-HTGTS data to detect multiway contacts. Three-way contact analysis of the Tcra locus demonstrated the co-occurrence of the proximal Jα genes, Vα genes and Eα in CD4+CD8+ double-positive thymocytes. Notably, the INT2-TEAp loop emerged as a prominent structure likely to be responsible for bringing the proximal Jα genes and the Vα genes into proximity. Moreover, the enhancer Eα utilizes this loop to establish physical proximity with the proximal Vα gene region. This study provides insights into the higher order chromatin structure of the Tcra locus, shedding light on the spatial organization of chromatin and its impact on V(D)J recombination. © The Author(s) 2023. Published by Oxford University Press on behalf of Nucleic Acids Research.

Citation

Ranran Dai, Yongchang Zhu, Zhaoqiang Li, Litao Qin, Nan Liu, Shixiu Liao, Bingtao Hao. Three-way contact analysis characterizes the higher order organization of the Tcra locus. Nucleic acids research. 2023 Sep 22;51(17):8987-9000