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Divergent gene expression and kinetics of circulating tumor-infiltrating lymphocytes with highly homologous T-cell receptor sequences during immunotherapy

ABSTRACT: Divergent gene expression and kinetics of circulating tumor-infiltrating lymphocytes with highly homologous T-cell receptor sequences during immunotherapy

PROVIDER: PRJNA1105373 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR28822171_1.fastq.gz	Fastqsanger.gz
	SRR28822171_2.fastq.gz	Fastqsanger.gz
	SRR28822172_1.fastq.gz	Fastqsanger.gz
	SRR28822172_2.fastq.gz	Fastqsanger.gz
	SRR28822173_1.fastq.gz	Fastqsanger.gz

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Divergent gene expression and kinetics of circulating tumor-infiltrating lymphocytes with highly homologous T-cell receptor sequences during immunotherapy

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Divergent transcriptional states and kinetics of circulating tumor-infiltrating lymphocyte repertoires with highly homologous T-cell receptor sequences in a patient during immunotherapy.

Project description:Evidence has shown that T-cell receptors (TCRs) that recognize the same epitopes may not be the exact TCR clonotypes but have slightly different TCR sequences. However, the changes in the genomic and transcriptomic signatures of these highly homologous T cells during immunotherapy remain unknown. Here, we examined the evolutionary features in circulating TCR clonotypes observed in tumors (tumor-infiltrating lymphocyte (TIL)-TCRs) by combining single-cell RNA/TCR sequencing of longitudinal blood samples and TCR sequencing of tumor tissue from a patient treated with anti-cytotoxic T-lymphocyte-associated protein 4/programmed cell death protein-1 therapy. We found frequent circulating CD8+ TIL-TCRs with identical complementarity determining region 3 (CDR3)α amino acid sequences but quasi-identical CDR3β and TCR α/β (TRA/TRB) sequences. Despite their sequence similarities, these highly homologous TIL-TCRs responded differently to immunotherapy, and exhibited distinct transcriptional signatures that were uniquely distinguished by the expression of GZMK Overall, the expression of IFNG in CD8+ T-cell subsets including highly homologous TIL-TCRs increased when the patient achieved a response, but gradually decreased as the patient developed acquired resistance. Our findings provide insight into the cross-talk between T cells in the tumor microenvironment and those in the blood, and highlight that CD8+ T cells with highly homologous TCR sequences might display divergent transcriptional states and kinetics in response to immunotherapy.

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