Evidence map›Paper›PMID 39622840›Full record

ArticleNature communications2024

Mechanisms of life cycle simplification in African trypanosomes.

Guy R Oldrieve, Frank Venter, Mathieu Cayla, Mylène Verney, Laurent Hébert, Manon Geerts, Nick Van Reet, Keith R Matthews

Abstract read
In one paragraph

Article in Nature communications, 2024. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 2 papers.

0numbers the graph read from it
0cells of the map it votes in
2citing papers in PubMed
–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

2 citing papers in PubMed.

  1. Article
  2. Review
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.

Guy R OldrieveInstitute for Immunology and Infection Research, School of Biological Sciences, University of Edinburgh, Edinburgh, EH9 3FL, UK. guy.oldrieve@ed.ac.uk.ORCID 0000-0003-1428-0608
Frank VenterInstitute for Immunology and Infection Research, School of Biological Sciences, University of Edinburgh, Edinburgh, EH9 3FL, UK.ORCID 0000-0002-1925-2510
Mathieu CaylaYork Biomedical Research Institute and Department of Biology, University of York, York, UK.ORCID 0000-0002-3731-7947
Mylène VerneyUnité Physiopathologie et Epidémiologie des Maladies Equines (PhEED), Laboratoire de Santé Animale, Site de Normandie, Agence Nationale de Sécurité Sanitaire de l'Alimentation, de l'Environnement et du Travail (ANSES), 1180 route de l'église, 14430, Goustranville, France.
Laurent HébertUnité Physiopathologie et Epidémiologie des Maladies Equines (PhEED), Laboratoire de Santé Animale, Site de Normandie, Agence Nationale de Sécurité Sanitaire de l'Alimentation, de l'Environnement et du Travail (ANSES), 1180 route de l'église, 14430, Goustranville, France.ORCID 0000-0002-5738-9913
Manon GeertsDepartment of Biology, Katholieke Universiteit Leuven, Leuven, Belgium.
Nick Van ReetDepartment of Biomedical Sciences, Institute of Tropical Medicine, Antwerp, Belgium.
Keith R MatthewsInstitute for Immunology and Infection Research, School of Biological Sciences, University of Edinburgh, Edinburgh, EH9 3FL, UK. keith.matthews@ed.ac.uk.ORCID 0000-0003-0309-9184

Funding

Bill and Melinda Gates Foundation (Bill & Melinda Gates Foundation) OPP1174221RCUK | Medical Research Council (MRC) MR/W026996/1Wellcome Trust 221717Wellcome Trust (Wellcome) 108905/Z/15/ZWellcome Trust (Wellcome) 221717/Z/20/Z
6 · The paper itself

Abstract

African trypanosomes are important parasites in sub-Saharan Africa that undergo a quorum-sensing dependent development to morphologically 'stumpy forms' in mammalian hosts to favour transmission by tsetse flies. However, some trypanosome clades have simplified their lifecycle by escaping dependence on tsetse allowing an expanded geographic range, with direct transmission between hosts achieved via blood-feeding biting flies and vampire bats (Trypanosoma brucei evansi, causing 'surra') or through sexual transmission (Trypanosoma brucei equiperdum, causing 'dourine'). Concomitantly, stumpy formation is reduced and the isolates are described as monomorphic, with infections spread widely in Africa, Asia, South America and parts of Europe. Here, using genomic analysis of distinct field isolates, we identify molecular changes that accompany the loss of the stumpy formation in monomorphic clades. Using CRISPR-mediated allelic replacement, mutations in two exemplar genes (Tb927.2.4020; Tb927.5.2580) are confirmed to reduce stumpy formation whereas another (Tb927.11.3400) is implicated in altered motility. Using laboratory selection we identify downregulation of RNA regulators as important in the initial development of monomorphism. This identifies a trajectory of events that simplify the life cycle in emergent and established monomorphic trypanosomes, with impact on disease spread, vector control strategies, geographical range and virulence.

Indexed as

Life Cycle StagesTrypanosoma brucei bruceiTrypanosomiasis, AfricanTsetse FliesAnimalsChiropteraHumansMutationProtozoan ProteinsProtozoan Proteins

Identifiers

PMID39622840
PMCPMC11612274

What Socratic holds

Textmetadata
LicenceCC BY
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Registered trials

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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 Socratic graph.