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  Endogenous virophages populate the genomes of a marine heterotrophic flagellate

Hackl, T., Duponchel, S., Barenhoff, K., Weinmann, A., & Fischer, M. G. (2020). Endogenous virophages populate the genomes of a marine heterotrophic flagellate. bioRxiv, 404863, pp. 1-19. doi:10.1101/2020.11.30.404863.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0007-B2DF-5 Version Permalink: http://hdl.handle.net/21.11116/0000-0007-B2E0-2
Genre: Journal Article

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bioRxiv_epub_2020_863.pdf (Preprint), 5MB
 
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Hackl, Thomas1, Author              
Duponchel, Sarah1, Author              
Barenhoff, Karina1, Author              
Weinmann, Alexa1, Author              
Fischer, Matthias G.1, Author              
Affiliations:
1Department of Biomolecular Mechanisms, Max Planck Institute for Medical Research, Max Planck Society, ou_1497700              

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 Abstract: Endogenous viral elements (EVEs) are frequently found in eukaryotic genomes, yet their integration dynamics and biological functions remain largely unknown. Unlike most other eukaryotic DNA viruses, the virophage mavirus integrates efficiently into the nuclear genome of its host, the marine heterotrophic flagellate Cafeteria burkhardae. Mavirus EVEs can reactivate upon superinfection with the lytic giant virus CroV and may act as an adaptive antiviral defense system, because mavirus increases host population survival during a coinfection with CroV. However, the prevalence of endogenous virophages in natural flagellate populations has not been explored. Here we report dozens of endogenous mavirus-like elements (EMALEs) in the nuclear genomes of four C. burkhardae strains. EMALEs were typically 20 kilobase pairs long and constituted 0.7% to 1.8% of each host genome. We analyzed 33 fully assembled EMALEs that fell into two main clusters and eight types based on GC-content, nucleotide similarity, and coding potential. Inter-strain comparison showed conservation of some EMALE insertion loci, whereas the majority of integration sites were unique to a given host strain. We also describe a group of tyrosine recombinase retrotransposons, some of which exhibited a strong preference for integration into EMALEs and represent yet another layer of parasitism in this microbial system. Our findings show that virophages are common, diverse, and dynamic genome components of the marine protist C. burkhardae, which implies important eco-evolutionary roles for these enigmatic viruses.

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Language(s): eng - English
 Dates: 2020-11-30
 Publication Status: Published online
 Pages: 19
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 Identifiers: DOI: 10.1101/2020.11.30.404863
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Title: bioRxiv
Source Genre: Collected Edition
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Pages: - Volume / Issue: - Sequence Number: 404863 Start / End Page: 1 - 19 Identifier: -