Feeding exogenous dsRNA interferes with endogenous sRNA accumulation in Paramecium.
dsRNA feeding
environmental RNAi
off-target
siRNA
Journal
DNA research : an international journal for rapid publication of reports on genes and genomes
ISSN: 1756-1663
Titre abrégé: DNA Res
Pays: England
ID NLM: 9423827
Informations de publication
Date de publication:
01 Feb 2020
01 Feb 2020
Historique:
received:
30
08
2019
accepted:
21
04
2020
pubmed:
28
4
2020
medline:
12
3
2021
entrez:
28
4
2020
Statut:
ppublish
Résumé
Supply of exogenous dsRNA (exo-dsRNA), either by injection or by feeding, is a fast and powerful alternative to classical knockout studies. The biotechnical potential of feeding techniques is evident from the numerous studies focusing on oral administration of dsRNA to control pests and viral infection in crops/animal farming. We aimed to dissect the direct and indirect effects of exo-dsRNA feeding on the endogenous short interfering RNA (endo-siRNA) populations of the free-living ciliate Paramecium. We introduced dsRNA fragments against Dicer1 (DCR1), involved in RNA interference (RNAi) against exo- and few endo-siRNAs, and an RNAi unrelated gene, ND169. Any feeding, even the control dsRNA, diminishes genome wide the accumulation of endo-siRNAs and mRNAs. This cannot be explained by direct off-target effects and suggests mechanistic overlaps of the exo- and endo-RNAi mechanisms. Nevertheless, we observe a stronger down-regulation of mRNAs in DCR1 feeding compared with ND169 knockdown. This is likely due to the direct involvement of DCR1 in endo-siRNA accumulation. We further observed a cis-regulatory effect on mRNAs that overlap with phased endo-siRNAs. This interference of exo-dsRNA with endo-siRNAs warrants further investigations into secondary effects in target species/consumers, risk assessment of dsRNA feeding applications, and environmental pollution with dsRNA.
Identifiants
pubmed: 32339224
pii: 5825730
doi: 10.1093/dnares/dsaa005
pmc: PMC7315353
pii:
doi:
Substances chimiques
RNA, Double-Stranded
0
RNA, Messenger
0
RNA, Small Interfering
0
Ribonuclease III
EC 3.1.26.3
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Informations de copyright
© The Author(s) 2020. Published by Oxford University Press on behalf of Kazusa DNA Research Institute.
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