Meteora sporadica, a protist with incredible cell architecture, is related to Hemimastigophora

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Meteora sporadica, a protist with incredible cell architecture, is related to Hemimastigophora

Eglit, Yana (author)

Shiratori, Takashi (author)

Jerlström-Hultqvist, Jon, 1982- (author): Institute for Comparative Genomics, and Department of Biochemistry and Molecular Biology, Dalhousie University, Halifax, Nova Scotia, Canada

Williamson, Kelsey (author)

Roger, Andrew J. (author)

Ishida, Ken-Ichiro (author)

Simpson, Alastair G. B. (author)

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Elsevier, 2024
2024
English.
In: Current Biology. - : Elsevier. - 0960-9822 .- 1879-0445.

Related links:: https://urn.kb.se/re...; show more...; https://doi.org/10.1...; show less...

Journal article (peer-reviewed)

Abstract Subject headings

“Kingdom-level” branches are being added to the tree of eukaryotes at a rate approaching one per year, with no signs of slowing down.1,2,3,4 Some are completely new discoveries, whereas others are morphologically unusual protists that were previously described but lacked molecular data. For example, Hemimastigophora are predatory protists with two rows of flagella that were known since the 19th century but proved to represent a new deep-branching eukaryote lineage when phylogenomic analyses were conducted.2 Meteora sporadica5 is a protist with a unique morphology; cells glide over substrates along a long axis of anterior and posterior projections while a pair of lateral “arms” swing back and forth, a motility system without any obvious parallels. Originally, Meteora was described by light microscopy only, from a short-term enrichment of deep-sea sediment. A small subunit ribosomal RNA (SSU rRNA) sequence was reported recently, but the phylogenetic placement of Meteora remained unresolved.6 Here, we investigated two cultivated Meteora sporadica isolates in detail. Transmission electron microscopy showed that both the anterior-posterior projections and the arms are supported by microtubules originating from a cluster of subnuclear microtubule organizing centers (MTOCs). Neither have a flagellar axoneme-like structure. Sequencing the mitochondrial genome showed this to be among the most gene-rich known, outside jakobids. Remarkably, phylogenomic analyses of 254 nuclear protein-coding genes robustly support a close relationship with Hemimastigophora. Our study suggests that Meteora and Hemimastigophora together represent a morphologically diverse “supergroup” and thus are important for resolving the tree of eukaryote life and early eukaryote evolution.

Subject headings

NATURVETENSKAP -- Biologi -- Evolutionsbiologi (hsv//swe)
NATURAL SCIENCES -- Biological Sciences -- Evolutionary Biology (hsv//eng)

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ref (subject category)
art (subject category)

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By the author/editor: Eglit, Yana; Shiratori, Takas ...; Jerlström-Hultqv ...; Williamson, Kels ...; Roger, Andrew J.; Ishida, Ken-Ichi ...; show more...; Simpson, Alastai ...; show less...

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NATURAL SCIENCES: NATURAL SCIENCES; and Biological Scien ...; and Evolutionary Bio ...

Articles in the publication: Current Biology

By the university: Uppsala University

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