{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,5]],"date-time":"2026-09-05T06:13:48Z","timestamp":1788588828865,"version":"build-2803163510"},"reference-count":37,"publisher":"Public Library of Science (PLoS)","issue":"10","license":[{"start":{"date-parts":[[2025,10,7]],"date-time":"2025-10-07T00:00:00Z","timestamp":1759795200000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Council of Scientific and Industrial Research (CSIR) Research Fellowship","award":["SRF\/09\/905(0022)\/2020-EMR-I"],"award-info":[{"award-number":["SRF\/09\/905(0022)\/2020-EMR-I"]}]},{"name":"Indian Council of Medical Research (ICMR) Centenary Post-doctoral Fellowship","award":["3\/1\/3\/PDF(18)\/2018-HRD"],"award-info":[{"award-number":["3\/1\/3\/PDF(18)\/2018-HRD"]}]},{"name":"Department of Science and Technology\u00e2\u20ac\u201cScience and Engineering Research Board (DST-SERB), Government of India","award":["CRG\/2020\/2022\/001397"],"award-info":[{"award-number":["CRG\/2020\/2022\/001397"]}]}],"content-domain":{"domain":["www.plosone.org"],"crossmark-restriction":false},"short-container-title":["PLoS One"],"abstract":"<jats:p>Sensory appendage proteins (SAPs), members of the odorant-binding protein family, mediate chemical communication that is vital for mosquito survival and vector competence. Among the six identified SAP members, <jats:italic>AcSAP1<\/jats:italic> and <jats:italic>AcSAP2<\/jats:italic> exhibited dominant expression in olfactory and leg tissues of <jats:italic>Anopheles culicifacies<\/jats:italic>. Our findings reveal that the expression of <jats:italic>AcSAP1<\/jats:italic>, and to a lesser extent <jats:italic>AcSAP2<\/jats:italic>, is significantly modulated by the circadian rhythm, with peak expression coinciding with the nocturnal host-seeking behavior of female mosquitoes. A delayed host attraction response by the <jats:italic>AcSAP1<\/jats:italic>-silenced female mosquitoes accounts for <jats:italic>AcSAP1\u2019s<\/jats:italic> potential role in host-seeking activities. <jats:italic>In silico<\/jats:italic> prediction data showed strong binding affinity to synthetic pyrethroid (deltamethrin); therefore, we tested the molecular responses of SAP to insecticide exposure. Strikingly, our WHO tube test bioassay-based experimental evaluation of mosquitoes\u2019 survival and expression modulation in the olfactory, wings, and legs highlighted SAPs\u2019 ability to sense toxic chemical cues. Finally, coupled with confocal microscopy analysis, our notable observation of a significant increase in <jats:italic>AcSAP1<\/jats:italic> expression in the eyes of mosquitoes challenged with deltamethrin suggests a potential role in integrating visual and chemosensory cues. Our results highlight the multifaceted functions of SAPs, demonstrating their dual roles in host-seeking and insecticide avoidance, which have significant implications for understanding mosquito biology and developing novel vector control strategies.<\/jats:p>","DOI":"10.1371\/journal.pone.0333483","type":"journal-article","created":{"date-parts":[[2025,10,7]],"date-time":"2025-10-07T17:34:06Z","timestamp":1759858446000},"page":"e0333483","update-policy":"https:\/\/doi.org\/10.1371\/journal.pone.corrections_policy","source":"Crossref","is-referenced-by-count":3,"title":["Sensory appendage protein triggers alarm to pyrethroid in Indian malarial vector Anopheles 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