Evidence map›Paper›PMID 18562339›Full record

ArticleMolecular biology and evolution2008

Intense transpositional activity of insertion sequences in an ancient obligate endosymbiont.

Richard Cordaux, Samuel Pichon, Alison Ling, Philippe Pérez, Carine Delaunay, Fabrice Vavre, Didier Bouchon, Pierre Grève

Open access · bronzeAbstract read
In one paragraph

Article in Molecular biology and evolution, 2008. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 36 papers.

0numbers the graph read from it
0cells of the map it votes in
36citing papers in PubMed
9.3field-weighted citation impact, top 2% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

36 citing papers in PubMed, 62 citations in OpenAlex.

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4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

8 authors at 4 institutions in 1 country.

Richard CordauxCNRS UMR 6556 Ecologie, Evolution, Symbiose, Université de Poitiers, Poitiers, France. richard.cordaux@univ-poitiers.fr
Samuel Pichon
Alison Ling
Philippe Pérez
Carine Delaunay
Fabrice Vavre
Didier Bouchon
Pierre Grève
Université Claude Bernard Lyon 1 · FRCentre National de la Recherche Scientifique · FRUniversité de Poitiers · FRÉcologie et Biologie des Interactions · FR

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

The streamlined genomes of ancient obligate endosymbionts generally lack transposable elements, such as insertion sequences (IS). Yet, the genome of Wolbachia, one of the most abundant bacterial endosymbionts on Earth, is littered with IS. Such a paradox raises the question as to why there are so many ISs in the genome of this ancient endosymbiont. To address this question, we investigated IS transpositional activity in the unculturable Wolbachia by tracking the evolutionary dynamics and history of ISWpi1 elements. We show that 1) ISWpi1 is widespread in Wolbachia, being present in at least 55% of the 40 sampled strains, 2) ISWpi1 copies exhibit virtually identical nucleotide sequences both within and among Wolbachia genomes and possess an intact transposase gene, 3) individual ISWpi1 copies are differentially inserted among Wolbachia genomes, and 4) ISWpi1 occurs at variable copy numbers among Wolbachia genomes. Collectively, our results provide compelling evidence for intense ISWpi1 transpositional activity and frequent ISWpi1 horizontal transmission among strains during recent Wolbachia evolution. Thus, the genomes of ancient obligate endosymbionts can carry high loads of functional and transpositionally active transposable elements. Our results also indicate that Wolbachia genomes have experienced multiple and temporally distinct ISWpi1 invasions during their evolutionary history. Such recurrent exposition to new IS invasions may explain, at least partly, the unusually high density of transposable elements found in the genomes of Wolbachia endosymbionts.

Indexed as

DNA, BacterialDNA Transposable ElementsEvolution, MolecularAnimalsCrustaceaGene Transfer, HorizontalInsectaMolecular Sequence DataSequence Homology, Nucleic AcidSymbiosisWolbachiaDNA, BacterialDNA Transposable Elements

Identifiers

PMID18562339
PMCPMC2515875
OpenAlexW2010896603

What OpenQuestion holds

Textmetadata
LicenceCC BY-NC
Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.