Evidence map›Paper›PMID 9584096›Full record

ArticleGenetics1998

Genetic polymorphism and natural selection in the malaria parasite Plasmodium falciparum.

A A Escalante, A A Lal, F J Ayala

Abstract readComparative Study
In one paragraph

Article in Genetics, 1998. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 110 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
110citing 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

110 citing papers in PubMed, 1 synthesis or guideline pooled it.

  1. Pooled it
  2. Trial
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  7. Genotyping and CharacterizingTropical medicine and infectious disease · 2024
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  13. Genomics reveals heterogeneousmedRxiv : the preprint server for health sciences · 2024
    Article
  14. Article
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50 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

3 authors.

A A EscalanteDivision of Parasitic Diseases, National Center for Infectious Diseases, Centers for Disease Control and Prevention, US Public Health Service, Chamblee, Georgia 30341, USA.
A A Lal
F J Ayala

Funding

POPULATION GENETICS OF SOD, ADH, AND GPDHP01GM042397 · NIGMS · UNIVERSITY OF CALIFORNIA IRVINE · 1991 to 1995
–
NIGMS NIH HHS GM42397
6 · The paper itself

Abstract

We have studied the genetic polymorphism at 10 Plasmodium falciparum loci that are considered potential targets for specific antimalarial vaccines. The polymorphism is unevenly distributed among the loci; loci encoding proteins expressed on the surface of the sporozoite or the merozoite (AMA-1, CSP, LSA-1, MSP-1, MSP-2, and MSP-3) are more polymorphic than those expressed during the sexual stages or inside the parasite (EBA-175, Pfs25, PF48/45, and RAP-1). Comparison of synonymous and nonsynonymous substitutions indicates that natural selection may account for the polymorphism observed at seven of the 10 loci studied. This inference depends on the assumption that synonymous substitutions are neutral, which we test by analyzing codon bias and G+C content in a set of 92 gene loci. We find evidence for an overall trend towards increasing A+T richness, but no evidence for mutation bias. Although the neutrality of synonymous substitutions is not definitely established, this trend towards an A+T rich genome cannot explain the accumulation of substitutions at least in the case of four genes (AMA-1, CSP, LSA-1, and PF48/45) because the Gleft and right arrow C transversions are more frequent than expected. Moreover, the Tajima test manifests positive natural selection for the MSP-1 and, less strongly, MSP-3 polymorphisms; the McDonald-Kreitman test manifests natural selection at LSA-1 and PF48/45. We conclude that there is definite evidence for positive natural selection in the genes encoding AMA-1, CSP, LSA-1, MSP-1, and Pfs48/45. For four other loci, EBA-175, MSP-2, MSP-3, and RAP-1, the evidence is limited. No evidence for natural selection is found for Pfs25.

Indexed as

Polymorphism, GeneticSelection, GeneticAnimalsAntigens, ProtozoanAntigens, SurfaceCarrier ProteinsPlasmodiumPlasmodium falciparumProtozoan ProteinsAntigens, ProtozoanAntigens, SurfaceCarrier Proteinserythrocyte-binding antigen 175, Plasmodiummerozoite surface protein 3, PlasmodiumPfs25 protein, Plasmodium falciparumProtozoan Proteinsrhoptry associated protein, Plasmodium

Identifiers

PMID9584096
PMCPMC1460124

What OpenQuestion holds

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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.