Retroelement guided protein diversification abounds in vast lineages of bacteria and archaea View Full Text


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Article Info

DATE

2017-04-03

AUTHORS

Blair G. Paul, David Burstein, Cindy J. Castelle, Sumit Handa, Diego Arambula, Elizabeth Czornyj, Brian C. Thomas, Partho Ghosh, Jeffery F. Miller, Jillian F. Banfield, David L. Valentine

ABSTRACT

Major radiations of enigmatic Bacteria and Archaea with large inventories of uncharacterized proteins are a striking feature of the Tree of Life1-5. The processes that led to functional diversity in these lineages, which may contribute to a host-dependent lifestyle, are poorly understood. Here, we show that diversity-generating retroelements (DGRs), which guide site-specific protein hypervariability6-8, are prominent features of genomically reduced organisms from the bacterial candidate phyla radiation (CPR) and as yet uncultivated phyla belonging to the DPANN (Diapherotrites, Parvarchaeota, Aenigmarchaeota, Nanoarchaeota and Nanohaloarchaea) archaeal superphylum. From reconstructed genomes we have defined monophyletic bacterial and archaeal DGR lineages that expand the known DGR range by 120% and reveal a history of horizontal retroelement transfer. Retroelement-guided diversification is further shown to be active in current CPR and DPANN populations, with an assortment of protein targets potentially involved in attachment, defence and regulation. Based on observations of DGR abundance, function and evolutionary history, we find that targeted protein diversification is a pronounced trait of CPR and DPANN phyla compared to other bacterial and archaeal phyla. This diversification mechanism may provide CPR and DPANN organisms with a versatile tool that could be used for adaptation to a dynamic, host-dependent existence. More... »

PAGES

17045-17045

References to SciGraph publications

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  • Identifiers

    URI

    http://scigraph.springernature.com/pub.10.1038/nmicrobiol.2017.45

    DOI

    http://dx.doi.org/10.1038/nmicrobiol.2017.45

    DIMENSIONS

    https://app.dimensions.ai/details/publication/pub.1084508967

    PUBMED

    https://www.ncbi.nlm.nih.gov/pubmed/28368387


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