title: Characterization and localization of Rickettsia sp. in water beetles of genus Deronectes (Coleoptera: Dytiscidae).
abstract: In the present study, Rickettsia sp. was detected in four water beetles of the genus Deronectes (Dytiscidae) for the first time. Rickettsiae were found in 100% of examined specimens of Deronectes platynotus (45/45), 39.4% of Deronectes aubei (28/71), 40% of Deronectes delarouzei (2/5) and 33.3% of Deronectes semirufus (1/3). Analysis of 16S rRNA gene sequences revealed a phylogenetic relationship with rickettsial isolates of Limonia chorea (Diptera), tentatively classified as members of the basal ancestral group. Phylogenetic analysis of the gltA (citrate synthase) gene sequences showed that Deronectes symbionts were closest to bacterial symbionts from spiders. Ultrastructural examinations revealed typical morphological features and intracellular arrangements of rickettsiae. The distribution, transmission and localization of Rickettsia sp. in D. platynotus were studied using a diagnostic PCR assay and FISH. Eggs from infected females of D. platynotus were all Rickettsia-positive, indicative of a vertical transmission.
authors: Department of Animal Ecology II, University of Bayreuth, Universitätsstrasse 30, Bayreuth, Germany. stefan.kuechler@uni-bayreuth.de
authors: Stefan Martin
authors: SM
authors: Küchler
authors: Siegfried
authors: S
authors: Kehl
authors: Konrad
authors: K
authors: Dettner
mesh_terms: D000818:Animals; D002950:Citrate (si)-Synthase / Q000235:genetics; D001517:Coleoptera / Q000382:microbiology*; D004269:DNA, Bacterial / Q000235:genetics; D005260:Female; D008297:Male; D010802:Phylogeny; D012329:RNA, Bacterial / Q000235:genetics; D012336:RNA, Ribosomal, 16S / Q000235:genetics; D012281:Rickettsia / Q000145:classification* / Q000201:enzymology / Q000235:genetics / Q000302:isolation & purification; D017422:Sequence Analysis, DNA; D013559:Symbiosis
chemical_list: D004269:DNA, Bacterial; D012329:RNA, Bacterial; D012336:RNA, Ribosomal, 16S; D002950:Citrate (si)-Synthase