Single-cell multi-omics profiling uncovers the immune heterogeneity in HIV-infected immunological non-responders.

BACKGROUND

Immunological non-responders (INRs) are people living with HIV-1 who fail to achieve full immune reconstitution despite long-term effective antiretroviral therapy (ART). This incomplete recovery of CD4 T cells increase the risk of opportunistic infections and non-AIDS-related morbidity and mortality. Understanding the mechanisms driving this immune dysfunction is critical for developing targeted therapies.

METHODS

We performed single-cell RNA sequencing (scRNA-seq) and single-cell VDJ sequencing (scVDJ-seq) on peripheral blood mononuclear cells (PBMCs) from INRs, immune responders (IRs), and healthy controls (HCs). We developed scGeneANOVA, a novel mixed model differential gene analysis tool, to detect differentially expressed genes and pathways. In addition, we developed the Viral Identification and Load Detection Analysis (VILDA) tool to quantify HIV-1 transcripts and investigate their relationship with interferon (IFN) pathway activation.

FINDINGS

Our analysis revealed that INRs exhibit a dysregulated IFN response, closely associated with CD4 T cell exhaustion and immune recovery failure. The scGeneANOVA tool identified critical genes and pathways that were missed by traditional analysis methods, while VILDA showed higher levels of HIV-1 transcripts in INRs, which may drive the heightened IFN response. These findings support a potential contribution of IFN signalling in INR-related immune dysfunction.

INTERPRETATION

Our study provides new insights into the pathogenic mechanisms behind immune recovery failure in INRs, suggesting that IFN signalling might be involved in the development of CD4 T cell exhaustion. The identification of key genes and pathways offers potential biomarkers and therapeutic targets for improving immune recovery in this vulnerable population.

FUNDING

This study was supported by the grants from Special Research Fund for the Central High-level Hospitals of Peking Union Medical College Hospital (Grant No. 2022-PUMCH-D-008), Chinese Academy of Medical Sciences (CAMS) Innovation Fund for Medical Sciences (Grant No. 2021-I2M-1-037), National Key Technologies R&D Program for the 13th Five-year Plan (Grant No. 2017ZX10202101-001). The funders played no role in the design, experiment conduction, data analysis and preparation of the manuscript of this work.