Ontogeny, species identity, and environment dominate microbiome dynamics in wild populations of kissing bugs (Triatominae)

0533610 - BC 2021 RIV GB eng J - Článek v odborném periodiku
Brown, Joel James - Rodriguez-Ruano, S. M. - Poosakkannu, A. - Batani, G. - Schmidt, J. O. - Roachell, W. - Zima, J. - Hypša, V. - Nováková, Eva
Ontogeny, species identity, and environment dominate microbiome dynamics in wild populations of kissing bugs (Triatominae).
Microbiome. Roč. 8, č. 1 (2020), č. článku 146. ISSN 2049-2618. E-ISSN 2049-2618
Institucionální podpora: RVO:60077344
Klíčová slova: bacteria * blood * hematophagous
Obor OECD: Microbiology
Impakt faktor: 14.652, rok: 2020
Způsob publikování: Open access
https://microbiomejournal.biomedcentral.com/track/pdf/10.1186/s40168-020-00921-x.pdf

Background: Kissing bugs (Triatominae) are blood-feeding insects best known as the vectors of Trypanosoma cruzi, the causative agent of Chagas' disease. Considering the high epidemiological relevance of these vectors, their biology and bacterial symbiosis remains surprisingly understudied. While previous investigations revealed generally low individual complexity but high among-individual variability of the triatomine microbiomes, any consistent microbiome determinants have not yet been identified across multiple Triatominae species. Methods: To obtain a more comprehensive view of triatomine microbiomes, we investigated the host-microbiome relationship of five Triatomaspecies sampled from white-throated woodrat (Neotoma albigula) nests in multiple locations across the USA. We applied optimised 16S rRNA gene metabarcoding with a novel 18S rRNA gene blocking primer to a set of 170 T. cruzi-negative individuals across all six instars. Results: Triatomine gut microbiome composition is strongly influenced by three principal factors: ontogeny, species identity, and the environment. The microbiomes are characterised by significant loss in bacterial diversity throughout ontogenetic development. First instars possess the highest bacterial diversity while adult microbiomes are routinely dominated by a single taxon. Primarily, the bacterial genus Dietziadominates late-stage nymphs and adults of T. rubida, T. protracta, and T. lecticulariabut is not present in the phylogenetically more istant T. gerstaeckeri and T. sanguisuga. Species-specific microbiome composition, particularly pronounced in early instars, is further modulated by locality-specific effects. In addition, pathogenic bacteria of the genus Bartonella, acquired from the vertebrate hosts, are an abundant component of Triatomamicrobiomes. Conclusion: Our study is the first to demonstrate deterministic patterns in microbiome composition among all life stages and multiple Triatomaspecies. We hypothesise that triatomine microbiome assemblages are produced by species- and life stage-dependent uptake of environmental bacteria and multiple indirect transmission strategies that promote bacterial transfer between individuals. Altogether, our study highlights the complexity of Triatominae symbiosis with bacteria and warrant further investigation to understand microbiome function in these important vectors.
Trvalý link: http://hdl.handle.net/11104/0315252