Evidence map›Paper›PMID 22919073›Full record

ArticleGenome research2012

Analysis of gene expression from the Wolbachia genome of a filarial nematode supports both metabolic and defensive roles within the symbiosis.

Alistair C Darby, Stuart D Armstrong, Germanus S Bah, Gaganjot Kaur, Margaret A Hughes, Suzanne M Kay, Pia Koldkjær, Lucille Rainbow, Alan D Radford, Mark L Blaxter and 5 more

Open access · bronzeAbstract read
In one paragraph

Article in Genome research, 2012. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 126 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
126citing papers in PubMed, 1 pooled it
–field-weighted citation impact
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

126 citing papers in PubMed, 1 synthesis or guideline pooled it, 194 citations in OpenAlex.

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  18. UnveilingFrontiers in cellular and infection microbiology · 2025
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66 more citing papers are in PubMed but not listed here.

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

15 authors at 4 institutions in 3 countries.

Alistair C DarbyInstitute of Integrative Biology and the Centre for Genomic Research, Biosciences Building, University of Liverpool, Liverpool, Merseyside L69 7ZB, United Kingdom.
Stuart D Armstrong
Germanus S Bah
Gaganjot Kaur
Margaret A Hughes
Suzanne M Kay
Pia Koldkjær
Lucille Rainbow
Alan D Radford
Mark L Blaxter
Vincent N Tanya
Alexander J Trees
Richard Cordaux
Jonathan M Wastling
Benjamin L Makepeace
University of Liverpool · GBEdinburgh Genomics · GBCentre National de la Recherche Scientifique · FRInstitut de Recherche Agricole pour le Développement · CM

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

The α-proteobacterium Wolbachia is probably the most prevalent, vertically transmitted symbiont on Earth. In contrast with its wide distribution in arthropods, Wolbachia is restricted to one family of animal-parasitic nematodes, the Onchocercidae. This includes filarial pathogens such as Onchocerca volvulus, the cause of human onchocerciasis, or river blindness. The symbiosis between filariae and Wolbachia is obligate, although the basis of this dependency is not fully understood. Previous studies suggested that Wolbachia may provision metabolites (e.g., haem, riboflavin, and nucleotides) and/or contribute to immune defense. Importantly, Wolbachia is restricted to somatic tissues in adult male worms, whereas females also harbor bacteria in the germline. We sought to characterize the nature of the symbiosis between Wolbachia and O. ochengi, a bovine parasite representing the closest relative of O. volvulus. First, we sequenced the complete genome of Wolbachia strain wOo, which revealed an inability to synthesize riboflavin de novo. Using RNA-seq, we also generated endobacterial transcriptomes from male soma and female germline. In the soma, transcripts for membrane transport and respiration were up-regulated, while the gonad exhibited enrichment for DNA replication and translation. The most abundant Wolbachia proteins, as determined by geLC-MS, included ligands for mammalian Toll-like receptors. Enzymes involved in nucleotide synthesis were dominant among metabolism-related proteins, whereas the haem biosynthetic pathway was poorly represented. We conclude that Wolbachia may have a mitochondrion-like function in the soma, generating ATP for its host. Moreover, the abundance of immunogenic proteins in wOo suggests a role in diverting the immune system toward an ineffective antibacterial response.

Indexed as

Gene Expression Regulation, BacterialGenome, BacterialAnimalsAnti-Bacterial AgentsChromatography, LiquidDNA, HelminthDNA ReplicationFemaleMaleOnchocerca volvulusProteomicsRiboflavinSequence Analysis, RNASymbiosisTandem Mass SpectrometryToll-Like ReceptorsAnti-Bacterial AgentsDNA, HelminthRiboflavinToll-Like Receptors

Identifiers

PMID22919073
PMCPMC3514676
OpenAlexW2113950088

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.