@article{fdi:010085367,
  title = {{G}ene copy number variations at the within-host population level modulate gene expression in a multipartite virus},
  author = {{G}allet, {R}. and {D}i {M}attia, {J}. and {R}avel, {S}. and {Z}eddam, {J}ean-{L}ouis and {V}italis, {R}. and {M}ichalakis, {Y}. and {B}lanc, {S}.},
  editor = {},
  language = {{ENG}},
  abstract = {{M}ultipartite viruses have a segmented genome, with each segment encapsidated separately. {I}n all multipartite virus species for which the question has been addressed, the distinct segments reproducibly accumulate at a specific and host-dependent relative frequency, defined as the 'genome formula'. {H}ere, we test the hypothesis that the multipartite genome organization facilitates the regulation of gene expression via changes of the genome formula and thus via gene copy number variations. {I}n a first experiment, the faba bean necrotic stunt virus ({FBNSV}), whose genome is composed of eight {DNA} segments each encoding a single gene, was inoculated into faba bean or alfalfa host plants, and the relative concentrations of the {DNA} segments and their corresponding messenger {RNA}s (m{RNA}s) were monitored. {I}n each of the two host species, our analysis consistently showed that the genome formula variations modulate gene expression, the concentration of each genome segment linearly and positively correlating to that of its cognate m{RNA} but not of the others. {I}n a second experiment, twenty parallel {FBNSV} lines were transferred from faba bean to alfalfa plants. {U}pon host switching, the transcription rate of some genome segments changes, but the genome formula is modified in a way that compensates for these changes and maintains a similar ratio between the various viral m{RNA}s. {I}nterestingly, a deep-sequencing analysis of these twenty {FBNSV} lineages demonstrated that the host-related genome formula shift operates independently of {DNA}-segment sequence mutation. {T}ogether, our results indicate that nanoviruses are plastic genetic systems, able to transiently adjust gene expression at the population level in changing environments, by modulating the copy number but not the sequence of each of their genes.},
  keywords = {virus ; multipartite ; gene expression ; gene copy number ; copy number ; variation ; genome formula},
  booktitle = {},
  journal = {{V}irus {E}volution},
  volume = {8},
  numero = {2},
  pages = {veac058 [11 ]},
  year = {2022},
  DOI = {10.1093/ve/veac058},
  URL = {https://www.documentation.ird.fr/hor/fdi:010085367},
}