Molecular evolutionary analysis of novel NSP4 mono-reassortant G1P8-E2 rotavirus strains that caused a discontinuous epidemic in Japan in 2015 and 2018
In the 2010s, several unusual rotavirus strains emerged, causing epidemics worldwide. This study reports a comprehensive molecular epidemiological study of rotaviruses in Japan based on full-genome analysis. From 2014 to 2019, a total of 489 rotavirus-positive stool specimens were identified, and th...
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| creator | Fujii, Yoshiki Tsugawa, Takeshi Fukuda, Yuya Adachi, Shuhei Honjo, Saho Akane, Yusuke Kondo, Kenji Sakai, Yoshiyuki Tanaka, Toju Sato, Toshiya Higasidate, Yoshihito Kubo, Noriaki Mori, Toshihiko Kato, Shinsuke Hamada, Ryo Kikuchi, Masayoshi Tahara, Yasuo Nagai, Kazushige Ohara, Toshio Yoshida, Masaki Nakata, Shuji Noguchi, Atsuko Kikuchi, Wakako Hamada, Hiromichi Tokutake-Hirose, Shoko Fujimori, Makoto Muramatsu, Masamichi |
| description | In the 2010s, several unusual rotavirus strains emerged, causing epidemics worldwide. This study reports a comprehensive molecular epidemiological study of rotaviruses in Japan based on full-genome analysis. From 2014 to 2019, a total of 489 rotavirus-positive stool specimens were identified, and the associated viral genomes were analyzed by next-generation sequencing. The genotype constellations of those strains were classified into nine patterns (G1P[8] (Wa), G1P[8]-E2, G1P[8] (DS-1), G2P[4] (DS-1), G3P[8] (Wa), G3P[8] (DS-1), G8P[8] (DS-1), G9P[8] (Wa), and G9P[8]-E2). The major prevalent genotype differed by year, comprising G8P[8] (DS-1) (37% of that year's isolates) in 2014, G1P[8] (DS-1) (65%) in 2015, G9P[8] (Wa) (72%) in 2016, G3P[8] (DS-1) (66%) in 2017, G1P[8]-E2 (53%) in 2018, and G9P[8] (Wa) (26%) in 2019. The G1P[8]-E2 strains (G1-P[8]-I1-R1-C1-M1-A1-N1-T1-E2-H1) isolated from a total of 42 specimens in discontinuous years (2015 and 2018), which were the newly-emerged NSP4 mono-reassortant strains. Based on the results of the Bayesian evolutionary analyses, G1P[8]-E2 and G9P[8]-E2 were hypothesized to have been generated from distinct independent inter-genogroup reassortment events. The G1 strains detected in this study were classified into multiple clusters, depending on the year of detection. A comparison of the predicted amino acid sequences of the VP7 epitopes revealed that the G1 strains detected in different years encoded VP7 epitopes harboring distinct mutations. These mutations may be responsible for immune escape and annual changes in the prevalent strains.In the 2010s, several unusual rotavirus strains emerged, causing epidemics worldwide. This study reports a comprehensive molecular epidemiological study of rotaviruses in Japan based on full-genome analysis. From 2014 to 2019, a total of 489 rotavirus-positive stool specimens were identified, and the associated viral genomes were analyzed by next-generation sequencing. The genotype constellations of those strains were classified into nine patterns (G1P[8] (Wa), G1P[8]-E2, G1P[8] (DS-1), G2P[4] (DS-1), G3P[8] (Wa), G3P[8] (DS-1), G8P[8] (DS-1), G9P[8] (Wa), and G9P[8]-E2). The major prevalent genotype differed by year, comprising G8P[8] (DS-1) (37% of that year's isolates) in 2014, G1P[8] (DS-1) (65%) in 2015, G9P[8] (Wa) (72%) in 2016, G3P[8] (DS-1) (66%) in 2017, G1P[8]-E2 (53%) in 2018, and G9P[8] (Wa) (26%) in 2019. The G1P[8]-E2 strains (G1-P[8]-I1-R1-C1-M1-A1-N1-T1-E2-H1) isol |
| doi_str_mv | 10.3389/fmicb.2024.1430557 |
| format | Article |
| fullrecord | <record><control><sourceid>proquest</sourceid><recordid>TN_cdi_proquest_miscellaneous_3084770690</recordid><sourceformat>XML</sourceformat><sourcesystem>PC</sourcesystem><sourcerecordid>3084770690</sourcerecordid><originalsourceid>FETCH-proquest_miscellaneous_30847706903</originalsourceid><addsrcrecordid>eNqVjr1OxDAQhC0EEie4F6DakibBsZ2fq9EBQgKdBAXdaUkcYeTYwWtHuifhdfFJFLRsMfsVo5lh7KripZTd5macTP9eCi5UWSnJ67o9YauqaVQhuXg7_cPnbE30yfMpLrKu2PeTt7pPFgPoxdsUjXcYDoAO7YEMgR_B-UVbeH7ZKZi880XQSORDRBfhvtp1xVZA8BEXExIBxYDGEcQPjNBjIj0AwmCo9y4al3z26NkMOq8G4-ARZ3RHELyqc-9whO6SnY1oSa9__wW7vtu-3j4Uc_BfSVPcTzlRW4tO58S95J1qW95suPyH9Qc3wmOS</addsrcrecordid><sourcetype>Aggregation Database</sourcetype><iscdi>true</iscdi><recordtype>article</recordtype><pqid>3084770690</pqid></control><display><type>article</type><title>Molecular evolutionary analysis of novel NSP4 mono-reassortant G1P8-E2 rotavirus strains that caused a discontinuous epidemic in Japan in 2015 and 2018</title><source>PubMed (Medline)</source><source>DOAJ Directory of Open Access Journals</source><source>EZB Electronic Journals Library</source><source>PubMed Central Open Access</source><creator>Fujii, Yoshiki ; Tsugawa, Takeshi ; Fukuda, Yuya ; Adachi, Shuhei ; Honjo, Saho ; Akane, Yusuke ; Kondo, Kenji ; Sakai, Yoshiyuki ; Tanaka, Toju ; Sato, Toshiya ; Higasidate, Yoshihito ; Kubo, Noriaki ; Mori, Toshihiko ; Kato, Shinsuke ; Hamada, Ryo ; Kikuchi, Masayoshi ; Tahara, Yasuo ; Nagai, Kazushige ; Ohara, Toshio ; Yoshida, Masaki ; Nakata, Shuji ; Noguchi, Atsuko ; Kikuchi, Wakako ; Hamada, Hiromichi ; Tokutake-Hirose, Shoko ; Fujimori, Makoto ; Muramatsu, Masamichi</creator><creatorcontrib>Fujii, Yoshiki ; Tsugawa, Takeshi ; Fukuda, Yuya ; Adachi, Shuhei ; Honjo, Saho ; Akane, Yusuke ; Kondo, Kenji ; Sakai, Yoshiyuki ; Tanaka, Toju ; Sato, Toshiya ; Higasidate, Yoshihito ; Kubo, Noriaki ; Mori, Toshihiko ; Kato, Shinsuke ; Hamada, Ryo ; Kikuchi, Masayoshi ; Tahara, Yasuo ; Nagai, Kazushige ; Ohara, Toshio ; Yoshida, Masaki ; Nakata, Shuji ; Noguchi, Atsuko ; Kikuchi, Wakako ; Hamada, Hiromichi ; Tokutake-Hirose, Shoko ; Fujimori, Makoto ; Muramatsu, Masamichi</creatorcontrib><description>In the 2010s, several unusual rotavirus strains emerged, causing epidemics worldwide. This study reports a comprehensive molecular epidemiological study of rotaviruses in Japan based on full-genome analysis. From 2014 to 2019, a total of 489 rotavirus-positive stool specimens were identified, and the associated viral genomes were analyzed by next-generation sequencing. The genotype constellations of those strains were classified into nine patterns (G1P[8] (Wa), G1P[8]-E2, G1P[8] (DS-1), G2P[4] (DS-1), G3P[8] (Wa), G3P[8] (DS-1), G8P[8] (DS-1), G9P[8] (Wa), and G9P[8]-E2). The major prevalent genotype differed by year, comprising G8P[8] (DS-1) (37% of that year's isolates) in 2014, G1P[8] (DS-1) (65%) in 2015, G9P[8] (Wa) (72%) in 2016, G3P[8] (DS-1) (66%) in 2017, G1P[8]-E2 (53%) in 2018, and G9P[8] (Wa) (26%) in 2019. The G1P[8]-E2 strains (G1-P[8]-I1-R1-C1-M1-A1-N1-T1-E2-H1) isolated from a total of 42 specimens in discontinuous years (2015 and 2018), which were the newly-emerged NSP4 mono-reassortant strains. Based on the results of the Bayesian evolutionary analyses, G1P[8]-E2 and G9P[8]-E2 were hypothesized to have been generated from distinct independent inter-genogroup reassortment events. The G1 strains detected in this study were classified into multiple clusters, depending on the year of detection. A comparison of the predicted amino acid sequences of the VP7 epitopes revealed that the G1 strains detected in different years encoded VP7 epitopes harboring distinct mutations. These mutations may be responsible for immune escape and annual changes in the prevalent strains.In the 2010s, several unusual rotavirus strains emerged, causing epidemics worldwide. This study reports a comprehensive molecular epidemiological study of rotaviruses in Japan based on full-genome analysis. From 2014 to 2019, a total of 489 rotavirus-positive stool specimens were identified, and the associated viral genomes were analyzed by next-generation sequencing. The genotype constellations of those strains were classified into nine patterns (G1P[8] (Wa), G1P[8]-E2, G1P[8] (DS-1), G2P[4] (DS-1), G3P[8] (Wa), G3P[8] (DS-1), G8P[8] (DS-1), G9P[8] (Wa), and G9P[8]-E2). The major prevalent genotype differed by year, comprising G8P[8] (DS-1) (37% of that year's isolates) in 2014, G1P[8] (DS-1) (65%) in 2015, G9P[8] (Wa) (72%) in 2016, G3P[8] (DS-1) (66%) in 2017, G1P[8]-E2 (53%) in 2018, and G9P[8] (Wa) (26%) in 2019. The G1P[8]-E2 strains (G1-P[8]-I1-R1-C1-M1-A1-N1-T1-E2-H1) isolated from a total of 42 specimens in discontinuous years (2015 and 2018), which were the newly-emerged NSP4 mono-reassortant strains. Based on the results of the Bayesian evolutionary analyses, G1P[8]-E2 and G9P[8]-E2 were hypothesized to have been generated from distinct independent inter-genogroup reassortment events. The G1 strains detected in this study were classified into multiple clusters, depending on the year of detection. A comparison of the predicted amino acid sequences of the VP7 epitopes revealed that the G1 strains detected in different years encoded VP7 epitopes harboring distinct mutations. These mutations may be responsible for immune escape and annual changes in the prevalent strains.</description><identifier>ISSN: 1664-302X</identifier><identifier>EISSN: 1664-302X</identifier><identifier>DOI: 10.3389/fmicb.2024.1430557</identifier><language>eng</language><ispartof>Frontiers in microbiology, 2024-01, Vol.15, p.1430557</ispartof><rights>Copyright © 2024 Fujii, Tsugawa, Fukuda, Adachi, Honjo, Akane, Kondo, Sakai, Tanaka, Sato, Higasidate, Kubo, Mori, Kato, Hamada, Kikuchi, Tahara, Nagai, Ohara, Yoshida, Nakata, Noguchi, Kikuchi, Hamada, Tokutake-Hirose, Fujimori and Muramatsu.</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,776,780,860,27901,27902</link.rule.ids></links><search><creatorcontrib>Fujii, Yoshiki</creatorcontrib><creatorcontrib>Tsugawa, Takeshi</creatorcontrib><creatorcontrib>Fukuda, Yuya</creatorcontrib><creatorcontrib>Adachi, Shuhei</creatorcontrib><creatorcontrib>Honjo, Saho</creatorcontrib><creatorcontrib>Akane, Yusuke</creatorcontrib><creatorcontrib>Kondo, Kenji</creatorcontrib><creatorcontrib>Sakai, Yoshiyuki</creatorcontrib><creatorcontrib>Tanaka, Toju</creatorcontrib><creatorcontrib>Sato, Toshiya</creatorcontrib><creatorcontrib>Higasidate, Yoshihito</creatorcontrib><creatorcontrib>Kubo, Noriaki</creatorcontrib><creatorcontrib>Mori, Toshihiko</creatorcontrib><creatorcontrib>Kato, Shinsuke</creatorcontrib><creatorcontrib>Hamada, Ryo</creatorcontrib><creatorcontrib>Kikuchi, Masayoshi</creatorcontrib><creatorcontrib>Tahara, Yasuo</creatorcontrib><creatorcontrib>Nagai, Kazushige</creatorcontrib><creatorcontrib>Ohara, Toshio</creatorcontrib><creatorcontrib>Yoshida, Masaki</creatorcontrib><creatorcontrib>Nakata, Shuji</creatorcontrib><creatorcontrib>Noguchi, Atsuko</creatorcontrib><creatorcontrib>Kikuchi, Wakako</creatorcontrib><creatorcontrib>Hamada, Hiromichi</creatorcontrib><creatorcontrib>Tokutake-Hirose, Shoko</creatorcontrib><creatorcontrib>Fujimori, Makoto</creatorcontrib><creatorcontrib>Muramatsu, Masamichi</creatorcontrib><title>Molecular evolutionary analysis of novel NSP4 mono-reassortant G1P8-E2 rotavirus strains that caused a discontinuous epidemic in Japan in 2015 and 2018</title><title>Frontiers in microbiology</title><description>In the 2010s, several unusual rotavirus strains emerged, causing epidemics worldwide. This study reports a comprehensive molecular epidemiological study of rotaviruses in Japan based on full-genome analysis. From 2014 to 2019, a total of 489 rotavirus-positive stool specimens were identified, and the associated viral genomes were analyzed by next-generation sequencing. The genotype constellations of those strains were classified into nine patterns (G1P[8] (Wa), G1P[8]-E2, G1P[8] (DS-1), G2P[4] (DS-1), G3P[8] (Wa), G3P[8] (DS-1), G8P[8] (DS-1), G9P[8] (Wa), and G9P[8]-E2). The major prevalent genotype differed by year, comprising G8P[8] (DS-1) (37% of that year's isolates) in 2014, G1P[8] (DS-1) (65%) in 2015, G9P[8] (Wa) (72%) in 2016, G3P[8] (DS-1) (66%) in 2017, G1P[8]-E2 (53%) in 2018, and G9P[8] (Wa) (26%) in 2019. The G1P[8]-E2 strains (G1-P[8]-I1-R1-C1-M1-A1-N1-T1-E2-H1) isolated from a total of 42 specimens in discontinuous years (2015 and 2018), which were the newly-emerged NSP4 mono-reassortant strains. Based on the results of the Bayesian evolutionary analyses, G1P[8]-E2 and G9P[8]-E2 were hypothesized to have been generated from distinct independent inter-genogroup reassortment events. The G1 strains detected in this study were classified into multiple clusters, depending on the year of detection. A comparison of the predicted amino acid sequences of the VP7 epitopes revealed that the G1 strains detected in different years encoded VP7 epitopes harboring distinct mutations. These mutations may be responsible for immune escape and annual changes in the prevalent strains.In the 2010s, several unusual rotavirus strains emerged, causing epidemics worldwide. This study reports a comprehensive molecular epidemiological study of rotaviruses in Japan based on full-genome analysis. From 2014 to 2019, a total of 489 rotavirus-positive stool specimens were identified, and the associated viral genomes were analyzed by next-generation sequencing. The genotype constellations of those strains were classified into nine patterns (G1P[8] (Wa), G1P[8]-E2, G1P[8] (DS-1), G2P[4] (DS-1), G3P[8] (Wa), G3P[8] (DS-1), G8P[8] (DS-1), G9P[8] (Wa), and G9P[8]-E2). The major prevalent genotype differed by year, comprising G8P[8] (DS-1) (37% of that year's isolates) in 2014, G1P[8] (DS-1) (65%) in 2015, G9P[8] (Wa) (72%) in 2016, G3P[8] (DS-1) (66%) in 2017, G1P[8]-E2 (53%) in 2018, and G9P[8] (Wa) (26%) in 2019. The G1P[8]-E2 strains (G1-P[8]-I1-R1-C1-M1-A1-N1-T1-E2-H1) isolated from a total of 42 specimens in discontinuous years (2015 and 2018), which were the newly-emerged NSP4 mono-reassortant strains. Based on the results of the Bayesian evolutionary analyses, G1P[8]-E2 and G9P[8]-E2 were hypothesized to have been generated from distinct independent inter-genogroup reassortment events. The G1 strains detected in this study were classified into multiple clusters, depending on the year of detection. A comparison of the predicted amino acid sequences of the VP7 epitopes revealed that the G1 strains detected in different years encoded VP7 epitopes harboring distinct mutations. These mutations may be responsible for immune escape and annual changes in the prevalent strains.</description><issn>1664-302X</issn><issn>1664-302X</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2024</creationdate><recordtype>article</recordtype><recordid>eNqVjr1OxDAQhC0EEie4F6DakibBsZ2fq9EBQgKdBAXdaUkcYeTYwWtHuifhdfFJFLRsMfsVo5lh7KripZTd5macTP9eCi5UWSnJ67o9YauqaVQhuXg7_cPnbE30yfMpLrKu2PeTt7pPFgPoxdsUjXcYDoAO7YEMgR_B-UVbeH7ZKZi880XQSORDRBfhvtp1xVZA8BEXExIBxYDGEcQPjNBjIj0AwmCo9y4al3z26NkMOq8G4-ARZ3RHELyqc-9whO6SnY1oSa9__wW7vtu-3j4Uc_BfSVPcTzlRW4tO58S95J1qW95suPyH9Qc3wmOS</recordid><startdate>20240101</startdate><enddate>20240101</enddate><creator>Fujii, Yoshiki</creator><creator>Tsugawa, Takeshi</creator><creator>Fukuda, Yuya</creator><creator>Adachi, Shuhei</creator><creator>Honjo, Saho</creator><creator>Akane, Yusuke</creator><creator>Kondo, Kenji</creator><creator>Sakai, Yoshiyuki</creator><creator>Tanaka, Toju</creator><creator>Sato, Toshiya</creator><creator>Higasidate, Yoshihito</creator><creator>Kubo, Noriaki</creator><creator>Mori, Toshihiko</creator><creator>Kato, Shinsuke</creator><creator>Hamada, Ryo</creator><creator>Kikuchi, Masayoshi</creator><creator>Tahara, Yasuo</creator><creator>Nagai, Kazushige</creator><creator>Ohara, Toshio</creator><creator>Yoshida, Masaki</creator><creator>Nakata, Shuji</creator><creator>Noguchi, Atsuko</creator><creator>Kikuchi, Wakako</creator><creator>Hamada, Hiromichi</creator><creator>Tokutake-Hirose, Shoko</creator><creator>Fujimori, Makoto</creator><creator>Muramatsu, Masamichi</creator><scope>7X8</scope></search><sort><creationdate>20240101</creationdate><title>Molecular evolutionary analysis of novel NSP4 mono-reassortant G1P8-E2 rotavirus strains that caused a discontinuous epidemic in Japan in 2015 and 2018</title><author>Fujii, Yoshiki ; Tsugawa, Takeshi ; Fukuda, Yuya ; Adachi, Shuhei ; Honjo, Saho ; Akane, Yusuke ; Kondo, Kenji ; Sakai, Yoshiyuki ; Tanaka, Toju ; Sato, Toshiya ; Higasidate, Yoshihito ; Kubo, Noriaki ; Mori, Toshihiko ; Kato, Shinsuke ; Hamada, Ryo ; Kikuchi, Masayoshi ; Tahara, Yasuo ; Nagai, Kazushige ; Ohara, Toshio ; Yoshida, Masaki ; Nakata, Shuji ; Noguchi, Atsuko ; Kikuchi, Wakako ; Hamada, Hiromichi ; Tokutake-Hirose, Shoko ; Fujimori, Makoto ; Muramatsu, Masamichi</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-proquest_miscellaneous_30847706903</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2024</creationdate><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Fujii, Yoshiki</creatorcontrib><creatorcontrib>Tsugawa, Takeshi</creatorcontrib><creatorcontrib>Fukuda, Yuya</creatorcontrib><creatorcontrib>Adachi, Shuhei</creatorcontrib><creatorcontrib>Honjo, Saho</creatorcontrib><creatorcontrib>Akane, Yusuke</creatorcontrib><creatorcontrib>Kondo, Kenji</creatorcontrib><creatorcontrib>Sakai, Yoshiyuki</creatorcontrib><creatorcontrib>Tanaka, Toju</creatorcontrib><creatorcontrib>Sato, Toshiya</creatorcontrib><creatorcontrib>Higasidate, Yoshihito</creatorcontrib><creatorcontrib>Kubo, Noriaki</creatorcontrib><creatorcontrib>Mori, Toshihiko</creatorcontrib><creatorcontrib>Kato, Shinsuke</creatorcontrib><creatorcontrib>Hamada, Ryo</creatorcontrib><creatorcontrib>Kikuchi, Masayoshi</creatorcontrib><creatorcontrib>Tahara, Yasuo</creatorcontrib><creatorcontrib>Nagai, Kazushige</creatorcontrib><creatorcontrib>Ohara, Toshio</creatorcontrib><creatorcontrib>Yoshida, Masaki</creatorcontrib><creatorcontrib>Nakata, Shuji</creatorcontrib><creatorcontrib>Noguchi, Atsuko</creatorcontrib><creatorcontrib>Kikuchi, Wakako</creatorcontrib><creatorcontrib>Hamada, Hiromichi</creatorcontrib><creatorcontrib>Tokutake-Hirose, Shoko</creatorcontrib><creatorcontrib>Fujimori, Makoto</creatorcontrib><creatorcontrib>Muramatsu, Masamichi</creatorcontrib><collection>MEDLINE - Academic</collection><jtitle>Frontiers in microbiology</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Fujii, Yoshiki</au><au>Tsugawa, Takeshi</au><au>Fukuda, Yuya</au><au>Adachi, Shuhei</au><au>Honjo, Saho</au><au>Akane, Yusuke</au><au>Kondo, Kenji</au><au>Sakai, Yoshiyuki</au><au>Tanaka, Toju</au><au>Sato, Toshiya</au><au>Higasidate, Yoshihito</au><au>Kubo, Noriaki</au><au>Mori, Toshihiko</au><au>Kato, Shinsuke</au><au>Hamada, Ryo</au><au>Kikuchi, Masayoshi</au><au>Tahara, Yasuo</au><au>Nagai, Kazushige</au><au>Ohara, Toshio</au><au>Yoshida, Masaki</au><au>Nakata, Shuji</au><au>Noguchi, Atsuko</au><au>Kikuchi, Wakako</au><au>Hamada, Hiromichi</au><au>Tokutake-Hirose, Shoko</au><au>Fujimori, Makoto</au><au>Muramatsu, Masamichi</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Molecular evolutionary analysis of novel NSP4 mono-reassortant G1P8-E2 rotavirus strains that caused a discontinuous epidemic in Japan in 2015 and 2018</atitle><jtitle>Frontiers in microbiology</jtitle><date>2024-01-01</date><risdate>2024</risdate><volume>15</volume><spage>1430557</spage><pages>1430557-</pages><issn>1664-302X</issn><eissn>1664-302X</eissn><abstract>In the 2010s, several unusual rotavirus strains emerged, causing epidemics worldwide. This study reports a comprehensive molecular epidemiological study of rotaviruses in Japan based on full-genome analysis. From 2014 to 2019, a total of 489 rotavirus-positive stool specimens were identified, and the associated viral genomes were analyzed by next-generation sequencing. The genotype constellations of those strains were classified into nine patterns (G1P[8] (Wa), G1P[8]-E2, G1P[8] (DS-1), G2P[4] (DS-1), G3P[8] (Wa), G3P[8] (DS-1), G8P[8] (DS-1), G9P[8] (Wa), and G9P[8]-E2). The major prevalent genotype differed by year, comprising G8P[8] (DS-1) (37% of that year's isolates) in 2014, G1P[8] (DS-1) (65%) in 2015, G9P[8] (Wa) (72%) in 2016, G3P[8] (DS-1) (66%) in 2017, G1P[8]-E2 (53%) in 2018, and G9P[8] (Wa) (26%) in 2019. The G1P[8]-E2 strains (G1-P[8]-I1-R1-C1-M1-A1-N1-T1-E2-H1) isolated from a total of 42 specimens in discontinuous years (2015 and 2018), which were the newly-emerged NSP4 mono-reassortant strains. Based on the results of the Bayesian evolutionary analyses, G1P[8]-E2 and G9P[8]-E2 were hypothesized to have been generated from distinct independent inter-genogroup reassortment events. The G1 strains detected in this study were classified into multiple clusters, depending on the year of detection. A comparison of the predicted amino acid sequences of the VP7 epitopes revealed that the G1 strains detected in different years encoded VP7 epitopes harboring distinct mutations. These mutations may be responsible for immune escape and annual changes in the prevalent strains.In the 2010s, several unusual rotavirus strains emerged, causing epidemics worldwide. This study reports a comprehensive molecular epidemiological study of rotaviruses in Japan based on full-genome analysis. From 2014 to 2019, a total of 489 rotavirus-positive stool specimens were identified, and the associated viral genomes were analyzed by next-generation sequencing. The genotype constellations of those strains were classified into nine patterns (G1P[8] (Wa), G1P[8]-E2, G1P[8] (DS-1), G2P[4] (DS-1), G3P[8] (Wa), G3P[8] (DS-1), G8P[8] (DS-1), G9P[8] (Wa), and G9P[8]-E2). The major prevalent genotype differed by year, comprising G8P[8] (DS-1) (37% of that year's isolates) in 2014, G1P[8] (DS-1) (65%) in 2015, G9P[8] (Wa) (72%) in 2016, G3P[8] (DS-1) (66%) in 2017, G1P[8]-E2 (53%) in 2018, and G9P[8] (Wa) (26%) in 2019. The G1P[8]-E2 strains (G1-P[8]-I1-R1-C1-M1-A1-N1-T1-E2-H1) isolated from a total of 42 specimens in discontinuous years (2015 and 2018), which were the newly-emerged NSP4 mono-reassortant strains. Based on the results of the Bayesian evolutionary analyses, G1P[8]-E2 and G9P[8]-E2 were hypothesized to have been generated from distinct independent inter-genogroup reassortment events. The G1 strains detected in this study were classified into multiple clusters, depending on the year of detection. A comparison of the predicted amino acid sequences of the VP7 epitopes revealed that the G1 strains detected in different years encoded VP7 epitopes harboring distinct mutations. These mutations may be responsible for immune escape and annual changes in the prevalent strains.</abstract><doi>10.3389/fmicb.2024.1430557</doi></addata></record> |
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| ispartof | Frontiers in microbiology, 2024-01, Vol.15, p.1430557 |
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| source | PubMed (Medline); DOAJ Directory of Open Access Journals; EZB Electronic Journals Library; PubMed Central Open Access |
| title | Molecular evolutionary analysis of novel NSP4 mono-reassortant G1P8-E2 rotavirus strains that caused a discontinuous epidemic in Japan in 2015 and 2018 |
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