Evidence map›Paper›PMID 21998476›Full record

ArticleThe Journal of infectious diseases2011

Hemoglobin S and C heterozygosity enhances neither the magnitude nor breadth of antibody responses to a diverse array of Plasmodium falciparum antigens.

Xiaolin Tan, Boubacar Traore, Kassoum Kayentao, Aissata Ongoiba, Safiatou Doumbo, Michael Waisberg, Ogobara K Doumbo, Philip L Felgner, Rick M Fairhurst, Peter D Crompton

Open access · bronzeAbstract read
In one paragraph

Article in The Journal of infectious diseases, 2011. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 28 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
28citing papers in PubMed, 1 pooled it
5.3field-weighted citation impact, top 5% 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

28 citing papers in PubMed, 1 synthesis or guideline pooled it, 41 citations in OpenAlex.

  1. Pooled it
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  4. Review
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  7. Article
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  11. β-Thalassemia Distribution in the Old World: an Ancient Disease Seen from a Historical Standpoint.Mediterranean journal of hematology and infectious diseases · 2017
    Review
  12. Article
  13. Article
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4 · The record

Corrections and comments

5 · Who and what money

Authors and funding

10 authors at 4 institutions in 2 countries.

Xiaolin TanDepartment of Medicine, Division of Infectious Diseases, University of California, Irvine, USA.
Boubacar Traore
Kassoum Kayentao
Aissata Ongoiba
Safiatou Doumbo
Michael Waisberg
Ogobara K Doumbo
Philip L Felgner
Rick M Fairhurst
Peter D Crompton
University of Bamako · MLNational Institute of Allergy and Infectious Diseases · USUniversity of California, Irvine · USNational Institutes of Health · US

Funding

Mechanisms of naturally-acquired immunity to malaria and clinical trials of anti-malaria monoclonal antibodiesZIAAI001155 · NIAID · NATIONAL INSTITUTE OF ALLERGY AND INFECTIOUS DISEASES · PI CROMPTON, PETER · 2011 to 2025
$30.9M
Mali International Center for Excellence in Research: Vectors and Hosts of Parasitic Infectious DiseasesZIAAI001062 · NIAID · NATIONAL INSTITUTE OF ALLERGY AND INFECTIOUS DISEASES · PI LEHMANN, TOVI · 2009 to 2025
$17.3M
Malaria Pathogenesis and Human ImmunityZIAAI001000 · NIAID · NATIONAL INSTITUTE OF ALLERGY AND INFECTIOUS DISEASES · PI FAIRHURST, RICK · 2009 to 2017
$9.3M
Scanning the P. falciparum proteome for vaccine antigensR43AI066791 · NIAID · IMMPORT THERAPEUTICS, INC. · PI FELGNER, PHILIP LOUIS · 2005 to 2006
$599k
Intramural NIH HHSNIAID NIH HHS 1R43AI066791NIAID NIH HHS R43 AI066791
6 · The paper itself

Abstract

backgroundHeterozygous states of hemoglobin (Hb) A and HbS (HbAS, sickle-cell trait) or HbC (HbAC) protect against Plasmodium falciparum malaria by unclear mechanisms. Several studies suggest that HbAS and HbAC accelerate the acquisition of immunity to malaria, possibly by enhancing P. falciparum-specific antibody responses.

methodsWe used a protein microarray representing 491 P. falciparum proteins expressed during exoerythrocytic and erythrocytic stages of the life cycle to test the hypothesis that HbAS and HbAC enhance the P. falciparum-specific IgG response compared with normal HbAA. Plasma samples were collected from Malian children aged 2-10 years before and after a 6-month malaria season and were probed against the microarray. Immunoglobulin G (IgG) profiles of children with HbAA (n = 106), HbAS (n = 15), and HbAC (n = 20) were compared.

resultsAlthough the magnitude and breadth of P. falciparum-specific IgG responses increased with age and from before to after the malaria season in each antigen category, Hb type did not independently predict significant differences in P. falciparum-specific IgG profiles.

conclusionsThese data do not support the hypothesis that HbAS and HbAC protect against malaria by enhancing P. falciparum-specific antibody responses. It remains possible that HbAS and HbAC protect against malaria by enhancing antibody responses to antigens not studied here or through other immune mechanisms.

Indexed as

Age FactorsAnimalsAntibodies, ProtozoanAntigens, ProtozoanChildChild, PreschoolFemaleHemoglobin AHemoglobin CHemoglobin, SickleHeterozygoteHumansImmunoglobulin GLife Cycle StagesMalaria, FalciparumMaleAntibodies, ProtozoanAntigens, ProtozoanHemoglobin AHemoglobin CHemoglobin, SickleImmunoglobulin G

Identifiers

PMID21998476
PMCPMC3203232
OpenAlexW2114550569

What OpenQuestion holds

Textmetadata
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.