{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"institution":[{"name":"bioRxiv"}],"indexed":{"date-parts":[[2026,5,21]],"date-time":"2026-05-21T08:58:13Z","timestamp":1779353893917,"version":"3.51.4"},"posted":{"date-parts":[[2023,3,6]]},"group-title":"Microbiology","reference-count":169,"publisher":"openRxiv","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"accepted":{"date-parts":[[2023,3,6]]},"abstract":"<jats:title>SUMMARY<\/jats:title>\n                <jats:p>\n                  Within a host, pathogens encounter a diverse and changing landscape of cell types, nutrients, and immune responses. Examining host-pathogen interactions in animal models can therefore reveal aspects of infection absent from cell culture. We use CRISPR-based screens to functionally profile the entire genome of the model apicomplexan parasite\n                  <jats:italic>Toxoplasma gondii<\/jats:italic>\n                  during mouse infection. Barcoded gRNAs were used to track mutant parasite lineages, enabling detection of bottlenecks and mapping of population structures. We uncovered over 300 genes that modulate parasite fitness in mice with previously unknown roles in infection. These candidates span multiple axes of host-parasite interaction, including determinants of tropism, host organelle remodeling, and metabolic rewiring. We mechanistically characterized three novel candidates, including GTP cyclohydrolase I, against which a small-molecule inhibitor could be repurposed as an antiparasitic compound. This compound exhibited antiparasitic activity against\n                  <jats:italic>T. gondii<\/jats:italic>\n                  and\n                  <jats:italic>Plasmodium falciparum,<\/jats:italic>\n                  the most lethal agent of malaria. Taken together, we present the first complete survey of an apicomplexan genome during infection of an animal host, and point to novel interfaces of host-parasite interaction that may offer new avenues for treatment.\n                <\/jats:p>","DOI":"10.1101\/2023.03.05.531216","type":"posted-content","created":{"date-parts":[[2023,3,9]],"date-time":"2023-03-09T03:40:12Z","timestamp":1678333212000},"source":"Crossref","is-referenced-by-count":5,"title":["Functional profiling of the\n                  <i>Toxoplasma<\/i>\n                  genome during acute mouse infection"],"prefix":"10.64898","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-0586-6095","authenticated-orcid":false,"given":"Christopher J.","family":"Giuliano","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7168-3481","authenticated-orcid":false,"given":"Kenneth J.","family":"Wei","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Faye M.","family":"Harling","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3488-9966","authenticated-orcid":false,"given":"Benjamin S.","family":"Waldman","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4821-8397","authenticated-orcid":false,"given":"Madeline A.","family":"Farringer","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8365-0436","authenticated-orcid":false,"given":"Elizabeth A.","family":"Boydston","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0824-6796","authenticated-orcid":false,"given":"Tammy C. 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