{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,11,12]],"date-time":"2025-11-12T06:32:05Z","timestamp":1762929125644,"version":"3.33.0"},"reference-count":36,"publisher":"Central Research Institute for Epidemiology","issue":"6","license":[{"start":{"date-parts":[[2024,12,15]],"date-time":"2024-12-15T00:00:00Z","timestamp":1734220800000},"content-version":"unspecified","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0"}],"content-domain":{"domain":["virusjour.crie.ru"],"crossmark-restriction":false},"short-container-title":["Problems of Virology"],"abstract":"<jats:p>Introduction. Omsk hemorrhagic fever (OHF) is a severe disease identified in the 1940s in Western Siberia, Russia. Disease is caused by the OHF virus, which belongs to the genus Orthoflavivirus.\r\nThe purpose of the work. Analysis of changes in the genome associated with the isolation of OHF virus strains in laboratory animals (Mus musculus).\r\nMaterials and methods. Whole-genome nucleotide sequences of OHF virus strains from the working collection of the laboratory of arboviral infections of the department of natural focal viral infections of the Omsk Research Institute of Natural Focal Infections of Rospotrebnadzor were used in the study, as well as sequences from GenBank. Assessment of adaptive changes in the genome of the OHF virus was carried out using discriminant analysis methods, analyzing the composition and localization of emerging substitutions in viral RNA sequences obtained during the adaptation of viruses to the mouse organism as a result of passaging. Linked nucleotide substitutions were identified by calculating the mutual information for each pair of columns in the array of aligned nucleotide sequences. In the phylogenetic analysis, the relaxed clock algorithm of the BEAST program was used.\r\nResults. It has been shown that point substitutions during adaptation of OHF viruses to the mouse organism occur in all parts of the genome. Many of these substitutions are included in the pattern of linked substitutions identified in the genome of the OHF virus. Discriminant analysis of differences in nucleotide substitutions for groups combining sequences by the number of passages does not allow reliable discrimination between original sequences obtained from muskrat and sequences from first passages, but it recognizes well sequences from 7 or more passages, which suggests the possibility of adaptive selection of nucleotide substitutions when interacting with the body of a white mouse. Calculation of the average rate of substitutions per site per year without taking into account the occurrence of adaptive and related substitutions gives a value of 10\u22125, which is almost an order of magnitude different from the result when their presence is taken into account \u2012 10\u22124.\r\nConclusion. Changes in the nucleotide sequences of OHF that occur during laboratory virus preservation practices may influence the evolutionary rate values determined when analyzing these sequences and require further study.<\/jats:p>","DOI":"10.36233\/0507-4088-266","type":"journal-article","created":{"date-parts":[[2025,1,15]],"date-time":"2025-01-15T19:52:34Z","timestamp":1736970754000},"page":"509-523","update-policy":"https:\/\/doi.org\/10.36233\/0372-9311-crossmark","source":"Crossref","is-referenced-by-count":2,"title":["Analysis of changes in the genome of the Omsk hemorrhagic fever virus (Flaviviridae: &lt;i&gt;Orthoflavivirus&lt;\/i&gt;) during laboratory practices for virus preservation"],"prefix":"10.36233","volume":"69","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-8536-0520","authenticated-orcid":false,"given":"Zhanna S.","family":"Tyulko","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3558-3261","authenticated-orcid":false,"given":"Artem V.","family":"Fadeev","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2754-6359","authenticated-orcid":false,"given":"Aleksei G.","family":"Vasilenko","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2046-9872","authenticated-orcid":false,"given":"Ekaterina A.","family":"Gradoboeva","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9088-3668","authenticated-orcid":false,"given":"Valerii V.","family":"Yakimenko","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1733-1255","authenticated-orcid":false,"given":"Andrey B.","family":"Komissarov","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"22004","published-online":{"date-parts":[[2024,12,15]]},"reference":[{"key":"ref1","doi-asserted-by":"crossref","unstructured":"Rudakov N.V., Yastrebov V.K., Yakimenko V.V. 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