Evidence map›Paper›PMID 25459204›Full record

ArticleSocial science & medicine (1982)2015

The geography of malaria genetics in the Democratic Republic of Congo: A complex and fragmented landscape.

Margaret Carrel, Jaymin Patel, Steve M Taylor, Mark Janko, Melchior Kashamuka Mwandagalirwa, Antoinette K Tshefu, Ananias A Escalante, Andrea McCollum, Md Tauqeer Alam, Venkatachalam Udhayakumar and 2 more

Abstract read
In one paragraph

Article in Social science & medicine (1982), 2015. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 12 papers.

0numbers the graph read from it
0cells of the map it votes in
12citing 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

12 citing papers in PubMed.

  1. Imported malaria predominates in near-elimination settings in Southwestern Uganda.medRxiv : the preprint server for health sciences · 2026
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  5. A Scoping Review of Spatial Analysis Approaches Using Health Survey Data in Sub-Saharan Africa.International journal of environmental research and public health · 2020
    Article
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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

12 authors.

Margaret CarrelDepartment of Geographical & Sustainability Sciences, University of Iowa, Iowa City, IA, USA. Electronic address: margaret-carrel@uiowa.edu.
Jaymin PatelDepartment of Epidemiology, Gillings School of Global Public Health, University of North Carolina- Chapel Hill Chapel Hill, NC, USA.
Steve M TaylorDepartment of Epidemiology, Gillings School of Global Public Health, University of North Carolina- Chapel Hill Chapel Hill, NC, USA; Division of Infectious Diseases and International Health, Duke University Medical Center, Durham, NC, USA; Duke Global Health Institute, Durham, NC, USA.
Mark JankoDepartment of Geography, University of North Carolina-Chapel Hill, Chapel Hill, NC, USA.
Melchior Kashamuka MwandagalirwaDepartment of Epidemiology, Gillings School of Global Public Health, University of North Carolina- Chapel Hill Chapel Hill, NC, USA.
Antoinette K TshefuEcole de Sante Publique, Faculte de Medecine, University of Kinshasa, Kinshasa, Democratic Republic of the Congo.
Ananias A EscalanteCenter for Evolutionary Medicine & Informatics, The Biodesign Institute, Arizona State University, Tempe, AZ, USA.
Andrea McCollumMalaria Branch, Division of Parasitic Diseases and Malaria, Center for Global Health, Centers for Disease Control and Prevention, Atlanta, GA, USA.
Md Tauqeer AlamMalaria Branch, Division of Parasitic Diseases and Malaria, Center for Global Health, Centers for Disease Control and Prevention, Atlanta, GA, USA.
Venkatachalam UdhayakumarMalaria Branch, Division of Parasitic Diseases and Malaria, Center for Global Health, Centers for Disease Control and Prevention, Atlanta, GA, USA.
Steven MeshnickDepartment of Epidemiology, Gillings School of Global Public Health, University of North Carolina- Chapel Hill Chapel Hill, NC, USA.
Michael EmchDepartment of Geography, University of North Carolina-Chapel Hill, Chapel Hill, NC, USA.

Funding

Research Services CoreP2CHD050924 · NICHD · UNIV OF NORTH CAROLINA CHAPEL HILL · PI KAREN B GUZZO · 2015 to 2026
$9.6M
Epidemiological and Spatial Models of Malaria TransmissionR01AI107949 · NIAID · UNIV OF NORTH CAROLINA CHAPEL HILL · PI MESHNICK, STEVEN RICHARD · 2014 to 2018
$2.5M
Molecular pathogenesis and genetic diversification of childhood falciparum malariK08AI100924 · NIAID · DUKE UNIVERSITY · PI TAYLOR, STEVE MYER · 2012 to 2016
$611k
Genetic epidemiology of malaria in the Democratic Republic of the CongoR56AI097609 · NIAID · UNIV OF NORTH CAROLINA CHAPEL HILL · PI MESHNICK, STEVEN RICHARD · 2012 to 2012
$488k
NIAID NIH HHS 1R56AI097609-01NIAID NIH HHS K08 AI100924NIAID NIH HHS K08AI100924NIAID NIH HHS R01 AI107949NIAID NIH HHS R56 AI097609NICHD NIH HHS P2C HD050924
6 · The paper itself

Abstract

Understanding how malaria parasites move between populations is important, particularly given the potential for malaria to be reintroduced into areas where it was previously eliminated. We examine the distribution of malaria genetics across seven sites within the Democratic Republic of Congo (DRC) and two nearby countries, Ghana and Kenya, in order to understand how the relatedness of malaria parasites varies across space, and whether there are barriers to the flow of malaria parasites within the DRC or across borders. Parasite DNA was retrieved from dried blood spots from 7 Demographic and Health Survey sample clusters in the DRC. Malaria genetic characteristics of parasites from Ghana and Kenya were also obtained. For each of 9 geographic sites (7 DRC, 1 Ghana and 1 Kenya), a pair-wise RST statistic was calculated, indicating the genetic distance between malaria parasites found in those locations. Mapping genetics across the spatial extent of the study area indicates a complex genetic landscape, where relatedness between two proximal sites may be relatively high (RST > 0.64) or low (RST < 0.05), and where distal sites also exhibit both high and low genetic similarity. Mantel's tests suggest that malaria genetics differ as geographic distances increase. Principal Coordinate Analysis suggests that genetically related samples are not co-located. Barrier analysis reveals no significant barriers to gene flow between locations. Malaria genetics in the DRC have a complex and fragmented landscape. Limited exchange of genes across space is reflected in greater genetic distance between malaria parasites isolated at greater geographic distances. There is, however, evidence for close genetic ties between distally located sample locations, indicating that movement of malaria parasites and flow of genes is being driven by factors other than distance decay. This research demonstrates the contributions that spatial disease ecology and landscape genetics can make to understanding the evolutionary dynamics of infectious diseases.

Indexed as

Gene FlowGeography, MedicalBloodDemocratic Republic of the CongoGenetic VariationGhanaHumansKenyaMalaria, FalciparumMicrosatellite RepeatsPlasmodium falciparumPolymerase Chain ReactionDemocratic Republic of CongoDisease ecologyLandscape geneticsMalaria

Identifiers

PMID25459204
PMCPMC4402241

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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 OpenQuestion graph.