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- Title
Genomic analysis finds no evidence of canonical eukaryotic DNA processing complexes in a free-living protist.
- Authors
Salas-Leiva, Dayana E.; Tromer, Eelco C.; Curtis, Bruce A.; Jerlström-Hultqvist, Jon; Kolisko, Martin; Yi, Zhenzhen; Salas-Leiva, Joan S.; Gallot-Lavallée, Lucie; Williams, Shelby K.; Kops, Geert J. P. L.; Archibald, John M.; Simpson, Alastair G. B.; Roger, Andrew J.
- Abstract
Cells replicate and segregate their DNA with precision. Previous studies showed that these regulated cell-cycle processes were present in the last eukaryotic common ancestor and that their core molecular parts are conserved across eukaryotes. However, some metamonad parasites have secondarily lost components of the DNA processing and segregation apparatuses. To clarify the evolutionary history of these systems in these unusual eukaryotes, we generated a genome assembly for the free-living metamonad Carpediemonas membranifera and carried out a comparative genomics analysis. Here, we show that parasitic and free-living metamonads harbor an incomplete set of proteins for processing and segregating DNA. Unexpectedly, Carpediemonas species are further streamlined, lacking the origin recognition complex, Cdc6 and most structural kinetochore subunits. Carpediemonas species are thus the first known eukaryotes that appear to lack this suite of conserved complexes, suggesting that they likely rely on yet-to-be-discovered or alternative mechanisms to carry out these fundamental processes. The mechanisms for replicating and segregating DNA are highly conserved across eukaryotes. A comparative genomic analysis of a free-living protist finds a surprising lack of protein complexes involved in these processes, suggesting that the organism uses alternative mechanisms to process DNA.
- Subjects
GENOMICS; DNA; COMPARATIVE genomics; EUKARYOTES; CELL cycle proteins; KINETOCHORE
- Publication
Nature Communications, 2021, Vol 12, Issue 1, p1
- ISSN
2041-1723
- Publication type
Article
- DOI
10.1038/s41467-021-26077-2