Evidence map›Paper›PMID 15114532›Full record

Trial reportAmerican journal of human genetics2004

Extended linkage disequilibrium surrounding the hemoglobin E variant due to malarial selection.

Jun Ohashi, Izumi Naka, Jintana Patarapotikul, Hathairad Hananantachai, Gary Brittenham, Sornchai Looareesuwan, Andrew G Clark, Katsushi Tokunaga

Open access · bronzeAbstract readClinical TrialRandomized Controlled Trial
In one paragraph

Trial report in American journal of human genetics, 2004. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 62 papers.

0numbers the graph read from it
0cells of the map it votes in
62citing papers in PubMed
4.6field-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

62 citing papers in PubMed, 136 citations in OpenAlex.

  1. Review
  2. Article
  3. Review
  4. Hemoglobin Variants as Targets for Stabilizing Drugs.Molecules (Basel, Switzerland) · 2025
    Review
  5. Article
  6. Article
  7. Article
  8. Article
  9. Article
  10. Article
  11. Article
  12. Review
  13. Review
  14. Hemoglobin E, malaria and natural selection.Evolution, medicine, and public health · 2019
    Review
  15. Article
  16. Article
  17. Article
  18. Article
  19. Article
  20. Article

2 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

8 authors at 4 institutions in 3 countries.

Jun OhashiDepartment of Human Genetics, The University of Tokyo, Tokyo, Japan. juno-tky@umin.ac.jp
Izumi Naka
Jintana Patarapotikul
Hathairad Hananantachai
Gary Brittenham
Sornchai Looareesuwan
Andrew G Clark
Katsushi Tokunaga
Mahidol University · THCornell University · USThe University of Tokyo · JPColumbia University · US

Funding

FIC NIH HHS D43TW00620
6 · The paper itself

Abstract

The hemoglobin E variant (HbE; ( beta )26Glu-->Lys) is concentrated in parts of Southeast Asia where malaria is endemic, and HbE carrier status has been shown to confer some protection against Plasmodium falciparum malaria. To examine the effect of natural selection on the pattern of linkage disequilibrium (LD) and to infer the evolutionary history of the HbE variant, we analyzed biallelic markers surrounding the HbE variant in a Thai population. Pairwise LD analysis of HbE and 43 surrounding biallelic markers revealed LD of HbE extending beyond 100 kb, whereas no LD was observed between non-HbE variants and the same markers. The inferred haplotype network suggests a single origin of the HbE variant in the Thai population. Forward-in-time computer simulations under a variety of selection models indicate that the HbE variant arose 1,240-4,440 years ago. These results support the conjecture that the HbE mutation occurred recently, and the allele frequency has increased rapidly. Our study provides another clear demonstration that a high-resolution LD map across the human genome can detect recent variants that have been subjected to positive selection.

Indexed as

Genetic Predisposition to DiseaseGenetic VariationSelection, GeneticAnimalsBiological EvolutionComputer SimulationEvolution, MolecularGene FrequencyGenetic MarkersHaplotypesHemoglobin AHemoglobin EHeterozygoteHomozygoteHumansLinkage DisequilibriumGenetic MarkersHemoglobin AHemoglobin E

Identifiers

PMID15114532
PMCPMC1182083
OpenAlexW2089772700

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.