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Mutant swarms of a totivirus-like entities are present in the red macroalga Chondrus crispus and have been partially transferred to the nuclear genome.
J Phycol. 2016 08; 52(4):493-504.JP

Abstract

Chondrus crispus Stackhouse (Gigartinales) is a red seaweed found on North Atlantic rocky shores. Electrophoresis of RNA extracts showed a prominent band with a size of around 6,000 bp. Sequencing of the band revealed several sequences with similarity to totiviruses, double-stranded RNA viruses that normally infect fungi. This virus-like entity was named C. crispus virus (CcV). It should probably be regarded as an extreme viral quasispecies or a mutant swarm since low identity (<65%) was found between sequences. Totiviruses typically code for two genes: one capsid gene (gag) and one RNA-dependent RNA polymerase gene (pol) with a pseudoknot structure between the genes. Both the genes and the intergenic structures were found in the CcV sequences. A nonidentical gag gene was also found in the nuclear genome of C. crispus, with associated expressed sequence tags (EST) and upstream regulatory features. The gene was presumably horizontally transferred from the virus to the alga. Similar dsRNA bands were seen in extracts from different life cycle stages of C. crispus and from all geographic locations tested. In addition, similar bands were also observed in RNA extractions from other red algae; however, the significance of this apparently widespread phenomenon is unknown. Neither phenotype caused by the infection nor any virus particles or capsid proteins were identified; thus, the presence of viral particles has not been validated. These findings increase the known host range of totiviruses to include marine red algae.

Authors+Show Affiliations

CNRS, UMR 8227, Integrative Biology of Marine Models, Station Biologique de Roscoff, CS 90074, 29688, Roscoff Cedex, France. UMR 8227, Integrative Biology of Marine Models, Station Biologique de Roscoff, Sorbonne Universités, UPMC Univ Paris 06, CS 90074, 29688, Roscoff Cedex, France.CNRS, UMR 8227, Integrative Biology of Marine Models, Station Biologique de Roscoff, CS 90074, 29688, Roscoff Cedex, France. UMR 8227, Integrative Biology of Marine Models, Station Biologique de Roscoff, Sorbonne Universités, UPMC Univ Paris 06, CS 90074, 29688, Roscoff Cedex, France.CNRS, UMR 8227, Integrative Biology of Marine Models, Station Biologique de Roscoff, CS 90074, 29688, Roscoff Cedex, France. UMR 8227, Integrative Biology of Marine Models, Station Biologique de Roscoff, Sorbonne Universités, UPMC Univ Paris 06, CS 90074, 29688, Roscoff Cedex, France.CNRS, UMR 8227, Integrative Biology of Marine Models, Station Biologique de Roscoff, CS 90074, 29688, Roscoff Cedex, France. UMR 8227, Integrative Biology of Marine Models, Station Biologique de Roscoff, Sorbonne Universités, UPMC Univ Paris 06, CS 90074, 29688, Roscoff Cedex, France.CNRS, UMR 8227, Integrative Biology of Marine Models, Station Biologique de Roscoff, CS 90074, 29688, Roscoff Cedex, France. UMR 8227, Integrative Biology of Marine Models, Station Biologique de Roscoff, Sorbonne Universités, UPMC Univ Paris 06, CS 90074, 29688, Roscoff Cedex, France.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

27151076

Citation

Rousvoal, Sylvie, et al. "Mutant Swarms of a Totivirus-like Entities Are Present in the Red Macroalga Chondrus Crispus and Have Been Partially Transferred to the Nuclear Genome." Journal of Phycology, vol. 52, no. 4, 2016, pp. 493-504.
Rousvoal S, Bouyer B, López-Cristoffanini C, et al. Mutant swarms of a totivirus-like entities are present in the red macroalga Chondrus crispus and have been partially transferred to the nuclear genome. J Phycol. 2016;52(4):493-504.
Rousvoal, S., Bouyer, B., López-Cristoffanini, C., Boyen, C., & Collén, J. (2016). Mutant swarms of a totivirus-like entities are present in the red macroalga Chondrus crispus and have been partially transferred to the nuclear genome. Journal of Phycology, 52(4), 493-504. https://doi.org/10.1111/jpy.12427
Rousvoal S, et al. Mutant Swarms of a Totivirus-like Entities Are Present in the Red Macroalga Chondrus Crispus and Have Been Partially Transferred to the Nuclear Genome. J Phycol. 2016;52(4):493-504. PubMed PMID: 27151076.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Mutant swarms of a totivirus-like entities are present in the red macroalga Chondrus crispus and have been partially transferred to the nuclear genome. AU - Rousvoal,Sylvie, AU - Bouyer,Betty, AU - López-Cristoffanini,Camilo, AU - Boyen,Catherine, AU - Collén,Jonas, Y1 - 2016/06/30/ PY - 2016/01/20/received PY - 2016/03/15/accepted PY - 2016/5/7/entrez PY - 2016/5/7/pubmed PY - 2018/1/13/medline KW - Chondrus KW - Rhodophyta KW - dsRNA KW - mutant swarm KW - totivirus KW - virus SP - 493 EP - 504 JF - Journal of phycology JO - J Phycol VL - 52 IS - 4 N2 - Chondrus crispus Stackhouse (Gigartinales) is a red seaweed found on North Atlantic rocky shores. Electrophoresis of RNA extracts showed a prominent band with a size of around 6,000 bp. Sequencing of the band revealed several sequences with similarity to totiviruses, double-stranded RNA viruses that normally infect fungi. This virus-like entity was named C. crispus virus (CcV). It should probably be regarded as an extreme viral quasispecies or a mutant swarm since low identity (<65%) was found between sequences. Totiviruses typically code for two genes: one capsid gene (gag) and one RNA-dependent RNA polymerase gene (pol) with a pseudoknot structure between the genes. Both the genes and the intergenic structures were found in the CcV sequences. A nonidentical gag gene was also found in the nuclear genome of C. crispus, with associated expressed sequence tags (EST) and upstream regulatory features. The gene was presumably horizontally transferred from the virus to the alga. Similar dsRNA bands were seen in extracts from different life cycle stages of C. crispus and from all geographic locations tested. In addition, similar bands were also observed in RNA extractions from other red algae; however, the significance of this apparently widespread phenomenon is unknown. Neither phenotype caused by the infection nor any virus particles or capsid proteins were identified; thus, the presence of viral particles has not been validated. These findings increase the known host range of totiviruses to include marine red algae. SN - 1529-8817 UR - https://www.unboundmedicine.com/medline/citation/27151076/Mutant_swarms_of_a_totivirus_like_entities_are_present_in_the_red_macroalga_Chondrus_crispus_and_have_been_partially_transferred_to_the_nuclear_genome_ DB - PRIME DP - Unbound Medicine ER -