{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,25]],"date-time":"2026-02-25T09:59:49Z","timestamp":1772013589223,"version":"3.50.1"},"reference-count":61,"publisher":"MDPI AG","issue":"2","license":[{"start":{"date-parts":[[2026,2,4]],"date-time":"2026-02-04T00:00:00Z","timestamp":1770163200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Federal Service for Surveillance on Consumer Rights Protection and Human Wellbeing","award":["4\/26"],"award-info":[{"award-number":["4\/26"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Viruses"],"abstract":"<jats:p>We present the single-cell transcriptomic analysis of peripheral blood mononuclear cells (PBMC) from individuals during acute HIV-1 infection caused by viral strains circulating in Russia and the Former Soviet Union (FSU) countries. Using 10x Genomics single-cell RNA sequencing (scRNA-seq) on the Illumina NextSeq 550 platform, we have analyzed scRNA-seq data from three treatment-naive patients (viral load &gt; 1 \u00d7 106 copies\/mL, estimated infection duration \u2264 4 weeks) and three healthy donors. Data integration (Seurat, Harmony), automated cell-type annotation (CellTypist), and GeneOntology (GO) enrichment analysis for highly expressed and low-expressed genes revealed a profound reorganization of transcriptional programs across key immune populations, including memory CD4+ and CD8+ T cells, non-classical monocytes and natural killer cells (NK-cells). We observed signatures of hyperactivation of pro-inflammatory pathways (NF-kB, TNF, and type I\/II interferon signaling), upregulation of genes associated with cellular migration (CXCR4, CCR7) and metabolic adaptation (oxidative phosphorylation components), alongside a mixed pro- and anti-apoptotic expression profile. Notably, our data pointed to a pronounced dysregulation of the TGF-\u03b2 and mTOR signaling cascades, disrupted intercellular communication networks\u2014particularly between cytotoxic cells and their regulators\u2014altered expression of genes implicated in disease progression (OLR1, SERPINB2, COPS9) and viral persistence control (NEAT1, NAF1). This work provides an initial single-cell transcriptional atlas characterizing early immune responses to HIV-1 sub-subtypes A6 and CRF63_02A6, the predominant drivers of the HIV epidemic across the FSU region.<\/jats:p>","DOI":"10.3390\/v18020204","type":"journal-article","created":{"date-parts":[[2026,2,4]],"date-time":"2026-02-04T12:51:56Z","timestamp":1770209516000},"page":"204","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Single-Cell Transcriptomic Profile Associated with Sub-Subtype A6 and CRF63-02A6 HIV-1 Strain Infection"],"prefix":"10.3390","volume":"18","author":[{"ORCID":"https:\/\/orcid.org\/0009-0002-6635-2642","authenticated-orcid":false,"given":"Kirill","family":"Elfimov","sequence":"first","affiliation":[{"name":"State Research Centre of Virology and Biotechnology \u2018Vector\u2019, Koltsovo 630559, Russia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5475-5981","authenticated-orcid":false,"given":"Anna","family":"Khozyainova","sequence":"additional","affiliation":[{"name":"Cancer Research Institute, Tomsk National Research Medical Center, Russian Academy of Sciences, Tomsk 634009, Russia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5896-8231","authenticated-orcid":false,"given":"Ludmila","family":"Gotfrid","sequence":"additional","affiliation":[{"name":"State Research Centre of Virology and Biotechnology \u2018Vector\u2019, Koltsovo 630559, Russia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0009-0003-9052-6427","authenticated-orcid":false,"given":"Dmitriy","family":"Baboshko","sequence":"additional","affiliation":[{"name":"State Research Centre of Virology and Biotechnology \u2018Vector\u2019, Koltsovo 630559, Russia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7060-4710","authenticated-orcid":false,"given":"Dmitry","family":"Kapustin","sequence":"additional","affiliation":[{"name":"Novosibirsk Regional Clinical Infectious Diseases Hospital, Novosibirsk 630531, Russia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0009-0006-3120-6548","authenticated-orcid":false,"given":"Polina","family":"Achigecheva","sequence":"additional","affiliation":[{"name":"State Research Centre of Virology and Biotechnology \u2018Vector\u2019, Koltsovo 630559, Russia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0465-1260","authenticated-orcid":false,"given":"Vasiliy","family":"Ekushov","sequence":"additional","affiliation":[{"name":"State Research Centre of Virology and Biotechnology \u2018Vector\u2019, Koltsovo 630559, Russia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0009-0007-1765-1909","authenticated-orcid":false,"given":"Maksim","family":"Halikov","sequence":"additional","affiliation":[{"name":"State Research Centre of Virology and Biotechnology \u2018Vector\u2019, Koltsovo 630559, Russia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9888-5422","authenticated-orcid":false,"given":"Mariya","family":"Gashnikova","sequence":"additional","affiliation":[{"name":"State Research Centre of Virology and Biotechnology \u2018Vector\u2019, Koltsovo 630559, Russia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4954-9905","authenticated-orcid":false,"given":"Tatyana","family":"Bauer","sequence":"additional","affiliation":[{"name":"State Research Centre of Virology and Biotechnology \u2018Vector\u2019, Koltsovo 630559, Russia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9608-2044","authenticated-orcid":false,"given":"Tatyana","family":"Tregubchak","sequence":"additional","affiliation":[{"name":"State Research Centre of Virology and Biotechnology \u2018Vector\u2019, Koltsovo 630559, Russia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0009-0006-8661-7109","authenticated-orcid":false,"given":"Andrey","family":"Murzin","sequence":"additional","affiliation":[{"name":"State Research Centre of Virology and Biotechnology \u2018Vector\u2019, Koltsovo 630559, Russia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0009-0008-8246-0743","authenticated-orcid":false,"given":"Arina","family":"Kiryakina","sequence":"additional","affiliation":[{"name":"State Research Centre of Virology and Biotechnology \u2018Vector\u2019, Koltsovo 630559, Russia"},{"name":"Department of Natural Sciences, Novosibirsk State University, Novosibirsk 630090, Russia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7418-4872","authenticated-orcid":false,"given":"Aleksei","family":"Totmenin","sequence":"additional","affiliation":[{"name":"State Research Centre of Virology and Biotechnology \u2018Vector\u2019, Koltsovo 630559, Russia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2577-0434","authenticated-orcid":false,"given":"Aleksandr","family":"Agaphonov","sequence":"additional","affiliation":[{"name":"State Research Centre of Virology and Biotechnology \u2018Vector\u2019, Koltsovo 630559, Russia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0891-0880","authenticated-orcid":false,"given":"Natalya","family":"Gashnikova","sequence":"additional","affiliation":[{"name":"State Research Centre of Virology and Biotechnology \u2018Vector\u2019, Koltsovo 630559, Russia"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2026,2,4]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","unstructured":"Ch\u00e9ret, A. 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