{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,2]],"date-time":"2026-07-02T16:19:54Z","timestamp":1783009194934,"version":"3.54.5"},"reference-count":44,"publisher":"Frontiers Media SA","license":[{"start":{"date-parts":[[2026,6,19]],"date-time":"2026-06-19T00:00:00Z","timestamp":1781827200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100001407","name":"Department of Biotechnology, Ministry of Science and Technology, India","doi-asserted-by":"publisher","award":["BT\/MB\/Indo-US\/VAP\/06\/2013"],"award-info":[{"award-number":["BT\/MB\/Indo-US\/VAP\/06\/2013"]}],"id":[{"id":"10.13039\/501100001407","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["frontiersin.org"],"crossmark-restriction":true},"short-container-title":["Front. Immunol."],"abstract":"<jats:sec>\n                    <jats:title>Introduction<\/jats:title>\n                    <jats:p>Chikungunya virus (CHIKV) infection causes acute febrile illness and severe joint inflammation, with some patients progressing to chronic arthritis. Early isotype-switched neutralizing antibody (nAb) responses have been associated with protection from chronic arthritis, but the cellular and molecular features of these early responses remain poorly defined.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>We performed single-cell sorting of plasmablasts (PBs) from patients with acute CHIKV infection and generated 94 human monoclonal antibodies (mAbs). These were evaluated for binding to CHIKV-infected Vero cells and to purified CHIKV, neutralizing activity, isotype distribution, somatic hypermutation (SHM), and immunoglobulin gene usage. PB-derived antibodies were compared with CHIKV-specific memory B cell (MBC)-derived antibodies from seropositive individuals.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>Over one-third of PB-derived mAbs recognized CHIKV-infected Vero cells, and most were class-switched. Among these, 12 bound to purified CHIKV, and 6 of them showed neutralizing activity. All PB-derived nAbs had germline-like sequences with little to no SHM, and four displayed shared clonotypic features, including a conserved `WEL' motif in the CDRH3 region. Conversely, CHIKV-specific MBC-derived nAbs showed diverse but often higher levels of SHM, consistent with affinity maturation.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Discussion<\/jats:title>\n                    <jats:p>Together, our findings suggest that early nAb responses generated during acute CHIKV infection are germline-biased with overlapping features suggestive of convergent clonotype responses, providing a cellular and molecular basis of the early protective humoral immunity.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.3389\/fimmu.2026.1846926","type":"journal-article","created":{"date-parts":[[2026,6,19]],"date-time":"2026-06-19T17:40:53Z","timestamp":1781890853000},"update-policy":"https:\/\/doi.org\/10.3389\/crossmark-policy","source":"Crossref","is-referenced-by-count":0,"title":["Shared germline-biased plasmablast clonotypes shape early neutralizing antibody responses during acute Chikungunya 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