Evidence map›Paper›PMID 19930637›Full record

ArticleBMC evolutionary biology2009

Diverse MHC IIB allele repertoire increases parasite resistance and body condition in the Long-tailed giant rat (Leopoldamys sabanus).

Tobias L Lenz, Konstans Wells, Martin Pfeiffer, Simone Sommer

Open access · goldAbstract read
In one paragraph

Article in BMC evolutionary biology, 2009. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 36 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
36citing papers in PubMed, 1 pooled it
1.2field-weighted citation impact, top 21% 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

36 citing papers in PubMed, 1 synthesis or guideline pooled it, 71 citations in OpenAlex.

  1. Pooled it
  2. Article
  3. Article
  4. Article
  5. MHC Diversity Across Time and Space.Ecology and evolution · 2025
    Review
  6. Article
  7. HLA Genes: A Hallmark of Functional Genetic Variation and Complex Evolution.Methods in molecular biology (Clifton, N.J.) · 2024
    Review
  8. Article
  9. Wild Boar (Pathogens (Basel, Switzerland) · 2022
    Article
  10. Article
  11. Article
  12. Article
  13. Article
  14. Frontiers in immunology · 2021
    Article
  15. Article
  16. Article
  17. Article
  18. Article
  19. Article
  20. Article
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

4 authors at 2 institutions in 1 country.

Tobias L LenzDepartment of Animal Ecology and Animal Conservation, University of Hamburg, 20146 Hamburg, Germany. lenz@evolbio.mpg.de
Konstans Wells
Martin Pfeiffer
Simone Sommer
Universität Hamburg · DEUniversität Ulm · DE

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

backgroundGenes of the major histocompatibility complex (MHC) code for key functions in the adaptive immune response of vertebrates and most of them show exceptionally high polymorphism. This polymorphism has been associated with the selection by diverse and changing parasite communities. We analysed MHC class IIB diversity, gastrointestinal parasite load and body condition in the wild ranging tropical rat Leopoldamys sabanus (Thomas, 1887) under natural selection conditions in a highly variable rainforest environment in Borneo to explore the mechanisms that maintain these high levels of genetic polymorphism.

resultsAllelic diversity was determined via SSCP and sequencing, and parasite screening was done through non-invasive faecal egg count. The detected alleles showed expected high levels of polymorphism and balancing selection. Besides a clear advantage for more diverse MHC genotypes in terms of number of alleles, reflected in better body condition and resistance against helminth infection, our data also suggested a positive effect of MHC allele divergence within an individual on these parameters.

conclusionIn accordance with the heterozygote advantage hypothesis, this study provides evidence for an advantage of more diverse MHC genotypes. More specifically, the potential negative relation between individual allele divergence and number of parasite species is in line with the 'divergent allele advantage' hypothesis.

Indexed as

Genes, MHC Class IIAllelesAnimalsBorneoEvolution, MolecularHeterozygoteHost-Parasite InteractionsImmunity, InnateMurinaeParasite Egg CountPolymorphism, GeneticPolymorphism, Single-Stranded ConformationalSelection, GeneticSequence Analysis, DNA

Identifiers

PMID19930637
PMCPMC2788554
OpenAlexW2053897907

What OpenQuestion holds

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LicenceCC BY
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.