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For insect-vectored viruses, an oppositely oriented process (basal-to-apical transit) occurs upon secondary infection of salivary glands and is necessary for virus transmission to non-insect hosts. To examine this inversely oriented virus transit in these polarized tissues, we assessed the intracellular trafficking of two model viral envelope proteins (baculovirus GP64 and vesicular stomatitis virus G) in the midgut and salivary gland cells of the model insect,\n              <jats:italic>Drosophila melanogaster<\/jats:italic>\n              . Using fly lines that inducibly express either GP64 or VSV G, we found that each protein, expressed alone, was trafficked basally in midgut enterocytes. In salivary gland cells, VSV G was trafficked apically in most but not all cells, whereas GP64 was consistently trafficked basally. We demonstrated that a Yxx\u00d8 motif present in both proteins was critical for basal trafficking in midgut enterocytes but dispensable for trafficking in salivary gland cells. Using RNAi, we found that clathrin adaptor protein complexes AP-1 and AP-3, as well as seven Rab GTPases, were involved in polarized VSV G trafficking in midgut enterocytes. Our results indicate that these viral envelope proteins encode the requisite information and require no other viral factors for appropriately polarized trafficking. In addition, they exploit tissue-specific differences in protein trafficking pathways to facilitate virus egress in the appropriate orientation for establishing systemic infections and vectoring infection to other hosts.\n            <\/jats:p>\n          <\/jats:sec>\n          <jats:sec>\n            <jats:title>IMPORTANCE<\/jats:title>\n            <jats:p>\n              Viruses that use insects as hosts must navigate specific routes through different insect tissues to complete their life cycles. The routes may differ substantially depending on the life cycle of the virus. Both insect pathogenic viruses and insect-vectored viruses must navigate through the polarized cells of the midgut epithelium to establish a systemic infection. In addition, insect-vectored viruses must also navigate through the polarized salivary gland epithelium for transmission. Thus, insect-vectored viruses appear to traffic in opposite directions in these two tissues. In this study, we asked whether two viral envelope proteins (VSV G and baculovirus GP64) alone encode the signals necessary for the polarized trafficking associated with their respective life cycles. Using\n              <jats:italic>Drosophila<\/jats:italic>\n              as a model to examine tissue-specific polarized trafficking of these viral envelope proteins, we identified one of the virus-encoded signals and several host proteins associated with regulating the polarized trafficking in the midgut epithelium.\n            <\/jats:p>\n          <\/jats:sec>","DOI":"10.1128\/jvi.00540-24","type":"journal-article","created":{"date-parts":[[2024,8,20]],"date-time":"2024-08-20T13:00:16Z","timestamp":1724158816000},"update-policy":"https:\/\/doi.org\/10.1128\/asmj-crossmark-policy-page","source":"Crossref","is-referenced-by-count":6,"title":["Viral and cellular determinants of polarized trafficking of viral envelope proteins from insect-specific and insect-vectored viruses in insect midgut and salivary gland cells"],"prefix":"10.1128","volume":"98","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-1484-6544","authenticated-orcid":true,"given":"Jeffrey J.","family":"Hodgson","sequence":"first","affiliation":[{"name":"Department of Entomology, Cornell Institute of Host-Microbe Interactions and Disease, Cornell University","place":["Ithaca, USA"]},{"name":"Boyce Thompson Institute at Cornell University","place":["Ithaca, USA"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7940-6905","authenticated-orcid":false,"given":"Robin Y.","family":"Chen","sequence":"additional","affiliation":[{"name":"Department of Entomology, Cornell Institute of Host-Microbe Interactions and Disease, Cornell University","place":["Ithaca, USA"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9228-567X","authenticated-orcid":true,"given":"Gary W.","family":"Blissard","sequence":"additional","affiliation":[{"name":"Boyce Thompson Institute at Cornell University","place":["Ithaca, USA"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3636-8387","authenticated-orcid":true,"given":"Nicolas","family":"Buchon","sequence":"additional","affiliation":[{"name":"Department of Entomology, Cornell Institute of Host-Microbe Interactions and Disease, Cornell University","place":["Ithaca, USA"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"235","reference":[{"key":"e_1_3_4_2_2","doi-asserted-by":"publisher","DOI":"10.1146\/annurev.ento.44.1.257"},{"key":"e_1_3_4_3_2","doi-asserted-by":"publisher","DOI":"10.1002\/047001590X"},{"key":"e_1_3_4_4_2","volume-title":"Baculoviruses as insecticides: four examples in baculovirus molecular biology","author":"Rohrmann GF","year":"2019","unstructured":"Rohrmann GF. 2019. 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