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Comparison of transcriptomic profiles in natural populations of rodents (house mouse and black rat) along invasion routes in Senegal

ABSTRACT: Comparison of transcriptomic profiles in natural populations of rodents (house mouse and black rat) along invasion routes in Senegal

PROVIDER: PRJNA449390 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR6973720.fastq.gz	Fastqsanger.gz
	SRR6973730.fastq.gz	Fastqsanger.gz
	SRR6973740.fastq.gz	Fastqsanger.gz
	SRR6973721.fastq.gz	Fastqsanger.gz
	SRR6973731.fastq.gz	Fastqsanger.gz

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Comparison of transcriptomic profiles in natural populations of rodents (house mouse and black rat) along invasion routes in Senegal

Project description:We compared gene expression proﬁles between anciently and recently established populations of two major invading species, the black rat Rattus rattus and the house mouse Mus musculus musculus, in Senegal. Transcriptome analyses revealed respectively 364 and 83 differentially expressed genes along the mouse and rat invasion routes. Among them, 10 and 15% were annotated with functions related to immunity. All immune-related genes detected along the mouse invasion route were over-expressed at the invasion front. Genes of the complement activation pathway were over-represented. Results were less straightforward when considering the black rat. No particular immune pathway was over-represented. In conclusion, we revealed changes in transcriptomic profiles along invasion routes. Patterns differed between invaders. They could potentially be driven by increased infection risks at invasion front for the house mouse and trade-offs between immune responses for the black rat. Our results provide a first step in identifying the immune ecoevolutionary processes potentially involved in invasion success.

2021-04-09 | GSE112890 | GEO

Comparative genomic hybridization of Bordetella pertussis clinical isoltates circultating in Senegal

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Same Invasion, Different Routes: Helminth Assemblages May Favor the Invasion Success of the House Mouse in Senegal.

Project description:Previous field-based studies have evidenced patterns in gastrointestinal helminth (GIH) assemblages of rodent communities that are consistent with "enemy release" and "spill-back" hypotheses, suggesting a role of parasites in the ongoing invasion success of the exotic house mouse (Mus musculus domesticus) in Senegal (West Africa). However, these findings came from a single invasion route, thus preventing to ascertain that they did not result from stochastic and/or selective processes that could differ across invasion pathways. In the present study, we investigated the distribution of rodent communities and their GIH assemblages in three distinct zones of Northern Senegal, which corresponded to independent house mouse invasion fronts. Our findings first showed an unexpectedly rapid spread of the house mouse, which reached even remote areas where native species would have been expected to dominate the rodent communities. They also strengthened previous insights suggesting a role of helminths in the invasion success of the house mouse, such as: (i) low infestation rates of invading mice by the exotic nematode Aspiculuris tetraptera at invasion fronts-except in a single zone where the establishment of the house mouse could be older than initially thought, which was consistent with the "enemy release" hypothesis; and (ii) higher infection rates by the local cestode Mathevotaenia symmetrica in native rodents with long co-existence history with invasive mice, bringing support to the "spill-back" hypothesis. Therefore, "enemy release" and "spill-back" mechanisms should be seriously considered when explaining the invasion success of the house mouse-provided further experimental works demonstrate that involved GIHs affect rodent fitness or exert selective pressures. Next steps should also include evolutionary, immunological, and behavioral perspectives to fully capture the complexity, causes and consequences of GIH variations along these invasion routes.

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Project description:Usutu virus (USUV) is a Culex-associated mosquito-borne flavivirus of the Flaviviridae family. Since its discovery in 1959, the virus has been isolated from birds, arthropods and humans in Europe and Africa. An increasing number of Usutu virus infections in humans with neurological presentations have been reported. Recently, the virus has been detected in bats and horses, which deviates from the currently proposed enzootic cycle of USUV involving several different avian and mosquito species. Despite this increasing number of viral detections in different mammalian hosts, the existence of a non-avian reservoir remains unresolved. In Kedougou, a tropical region in the southeast corner of Senegal, Usutu virus was detected, isolated and sequenced from five asymptomatic small mammals: Two different rodent species and a single species of shrew. Additional molecular characterization and in vivo growth dynamics showed that these rodents/shrew-derived viruses are closely related to the reference strain (accession number: AF013412) and are as pathogenic as other characterized strains associated with neurological invasions in human. This is the first evidence of Usutu virus isolation from rodents or shrews. Our findings emphasize the need to consider a closer monitoring of terrestrial small mammals in future active surveillance, public health, and epidemiological efforts in response to USUV in both Africa and Europe.

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