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Identification of Ochrobactrum as a bacteria with transstadial transmission and potential for application in paratransgenic control of leishmaniasis

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Abstract

Leishmaniasis is a zoonotic vector-borne disease with worldwide distribution. All current approaches in leishmaniasis control or development of vaccines/cures showed only limited success. Recently, paratransgenesis has been marked as a promising strategy for leishmaniasis control. Thus, the investigations of the gut microbial content of sand flies have gained popularity. Gut microbial composition of the laboratory colony of Phlebotomus papatasi was investigated via microbial culturomics approach which refers to the combination of multiple culture conditions and different selective and/or enriched culture mediums, followed by 16S rDNA sequencing. Investigations were conducted on three offspring generations, with six samplings of immature stages (four larval samplings, one pre-pupa, one pupa) and samplings of adults before and after blood feeding. The aim was to determine if microbiome changes during the sand fly development and to identify bacteria with transstadial potential. The presence of 8 bacterial taxa (Bacillus sp., Terribacillus sp., Staphylococcus sp., Alcaligenes sp., Microbacterium sp., Leucobacter sp., Ochrobactrum sp. and Enterobacter sp.), 2 fungi (Fusarium sp. and Acremonium sp.) and 1 yeast (Candida sp.) were recorded. Gram-positive bacteria were more diverse, but gram-negative bacteria were more abundant. All taxa were recorded among immature stage samples, while only one bacterium was detected in adults. Microbial diversity among larval samples was stable, with a steady decrease in pre-pupa and pupa, resulting in the survival of only Ochrobactrum sp. in adults. Abundance of microbes was higher when larvae were actively feeding, with a gradual decrease after larvae stopped feeding and commenced pupation. Ochrobactrum sp. is the bacteria with transstadial potential, worthy of future in-depth analysis for the application in paratransgenic approach for the control of Leishmania sp.

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The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.

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Acknowledgements

The authors would like to thank Sefika Özcan and Elif Hatice Ayten for their immense help and support in sand fly colony maintenance.

Funding

Paratransgenesis as a weapon against leishmaniasis (PartoLeish). European Commission Horizon 2020 Marie Skłodowska-Curie Actions and The Scientific and Technological Research Council of Türkiye (TÜBİTAK) Cofund program (Co-Funded Brain Circulation Scheme2 - CoCirculation2; TÜBİTAK 2236; Project No: 121C042)

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Conceptualization, methodology, funding acquisition and writing of original draft were performed by S.V.; formal analysis and investigation were done by S.V., B.E.S., A.D.U. and C.K.; review and edition of the manuscript: S.V., B.E.S., A.D.U., A.Y., C.K., B.A.; S.V. and B.A. were supervising the work. All authors reviewed the manuscript.

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Correspondence to Slavica Vaselek.

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The authors declare no competing interests.

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Section Editor: Sutherland Maciver

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Vaselek, S., Sarac, B.E., Uzunkaya, A.D. et al. Identification of Ochrobactrum as a bacteria with transstadial transmission and potential for application in paratransgenic control of leishmaniasis. Parasitol Res 123, 82 (2024). https://doi.org/10.1007/s00436-023-08087-9

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  • DOI: https://doi.org/10.1007/s00436-023-08087-9

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