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Physiol."],"abstract":"<jats:p>Chitinases are enzymes responsible for the hydrolysis of glycosidic linkages within chitin chains. In insects, chitinases are typically members of the multigenic glycoside hydrolase family 18 (GH18). They participate in the relocation of chitin during development and molt, and in digestion in detritivores and predatory insects, and they control the peritrophic membrane thickness. Chitin metabolism is a promising target for developing vector control strategies, and knowledge of the roles of chitinases may reveal new targets and illuminate unique aspects of their physiology and interaction with microorganisms. <jats:italic>Rhodnius prolixus<\/jats:italic> is an important vector of Chagas disease, which is caused by the parasite <jats:italic>Trypanosoma cruzi<\/jats:italic>. In this study, we performed annotation and structural characterization of nine chitinase and chitinase-like protein genes in the <jats:italic>R. prolixus<\/jats:italic> genome. The roles of their corresponding transcripts were studied in more depth; their physiological roles were studied through RNAi silencing. Phylogenetic analysis of coding sequences showed that these genes belong to different subfamilies of GH18 chitinases already described in other insects. The expression patterns of these genes in different tissues and developmental stages were initially characterized using RT-PCR. RNAi screening showed silencing of the gene family members with very different efficiencies. Based on the knockdown results and the general lack of information about subgroup VIII of GH18, the <jats:italic>RpCht7<\/jats:italic> gene was chosen for phenotype analysis. <jats:italic>RpCht7<\/jats:italic> knockdown doubled the mortality in starving fifth-instar nymphs compared to dsGFP-injected controls. However, it did not alter blood intake, diuresis, digestion, molting rate, molting defects, sexual ratio, percentage of hatching, or average hatching time. Nevertheless, female oviposition was reduced by 53% in <jats:italic>RpCht7<\/jats:italic>-silenced insects, and differences in oviposition occurred within 14\u201320\u00a0days after a saturating blood meal. These results suggest that <jats:italic>RpCht7<\/jats:italic> may be involved in the reproductive physiology and vector fitness of <jats:italic>R. prolixus<\/jats:italic>.<\/jats:p>","DOI":"10.3389\/fphys.2022.861620","type":"journal-article","created":{"date-parts":[[2022,10,3]],"date-time":"2022-10-03T05:31:31Z","timestamp":1664775091000},"update-policy":"https:\/\/doi.org\/10.3389\/crossmark-policy","source":"Crossref","is-referenced-by-count":5,"title":["Structure and expression of Rhodnius prolixus GH18 chitinases and chitinase-like proteins: Characterization of the physiological role of RpCht7, a gene from subgroup VIII, in vector fitness and reproduction"],"prefix":"10.3389","volume":"13","author":[{"given":"Maiara do Valle Faria","family":"Gama","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Caroline Silva","family":"Moraes","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Bruno","family":"Gomes","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Hector Manuel","family":"Diaz-Albiter","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Rafael Dias","family":"Mesquita","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Eloy","family":"Seabra-Junior","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Patr\u00edcia","family":"Azambuja","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Eloi de Souza","family":"Garcia","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Fernando Ariel","family":"Genta","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1965","published-online":{"date-parts":[[2022,10,3]]},"reference":[{"key":"B1","doi-asserted-by":"publisher","first-page":"8979","DOI":"10.1073\/pnas.151103798","article-title":"Structural insights into the catalytic mechanism of a family 18 exo-chitinase","volume":"98","author":"Aalten","year":"2001","journal-title":"Proc. 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