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© Research
Publication : Molecular biology and evolution

Giant Viruses Encode Actin-Related Proteins.

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in Molecular biology and evolution - 03 Feb 2022

Da Cunha V, Gaia M, Ogata H, Jaillon O, Delmont TO, Forterre P,

Link to Pubmed [PMID] – 35150280

Link to DOI – 10.1093/molbev/msac022

Mol Biol Evol 2022 Feb; 39(2):

The emergence of the eukaryotic cytoskeleton is a critical yet puzzling step of eukaryogenesis. Actin and actin-related proteins (ARPs) are ubiquitous components of this cytoskeleton. The gene repertoire of the Last Eukaryotic Common Ancestor (LECA) would have therefore harbored both actin and various ARPs. Here, we report the presence and expression of actin-related genes in viral genomes (viractins) of some Imitervirales, a viral order encompassing the giant Mimiviridae. Phylogenetic analyses suggest an early recruitment of an actin-related gene by viruses from ancient protoeukaryotic hosts before the emergence of modern eukaryotes, possibly followed by a back transfer that gave rise to eukaryotic actins. This supports a coevolutionary scenario between pre-LECA lineages and their viruses, which could have contributed to the emergence of the modern eukaryotic cytoskeleton.

https://pubmed.ncbi.nlm.nih.gov/35150280