Evidence map›Paper›PMID 17395716›Full record

ArticleProceedings of the National Academy of Sciences of the United States of America2007

Simultaneous amino acid substitutions at antigenic sites drive influenza A hemagglutinin evolution.

Arthur Chun-Chieh Shih, Tzu-Chang Hsiao, Mei-Shang Ho, Wen-Hsiung Li

Open access · greenAbstract readComparative Study
In one paragraph

Article in Proceedings of the National Academy of Sciences of the United States of America, 2007. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 128 papers.

0numbers the graph read from it
0cells of the map it votes in
128citing papers in PubMed
8.0field-weighted citation impact, top 2% 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

128 citing papers in PubMed, 248 citations in OpenAlex.

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  11. Concepts and Methods for Predicting Viral Evolution.Methods in molecular biology (Clifton, N.J.) · 2025
    Article
  12. Review
  13. Progress of Influenza Viruses and Inhibitors.Current medicinal chemistry · 2025
    Review
  14. Concepts and methods for predicting viral evolution.bioRxiv : the preprint server for biology · 2024
    Article
  15. Article
  16. Article
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68 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

4 authors at 4 institutions in 4 countries.

Arthur Chun-Chieh ShihInstitute of Information Science, Academia Sinica, Nankang, Taipei 115, Taiwan.
Tzu-Chang Hsiao
Mei-Shang Ho
Wen-Hsiung Li
Institute of Biomedical Science · GBInstitute of Information Science · SIInstitute of Information Science, Academia Sinica · TWUniversity of Chicago · US

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

The HA1 domain of HA, the major antigenic protein of influenza A viruses, contains all of the antigenic sites of HA and is under continual immune-driven selection. To resolve controversies on whether only a few or many residue sites of HA1 have undergone positive selection, whether positive selection at HA1 is continual or punctuated, and whether antigenic change is punctuated, we introduce an approach to analyze 2,248 HA1 sequences collected from 1968 to 2005. We identify 95 substitutions at 63 sites from 1968 to 2005 and show that each substitution occurred very rapidly. The rapid substitution and the fact that 57 of the 63 sites are antigenic sites indicate that hitchhiking plays a minor role and that most of these sites, many more than previously found, have undergone positive selection. Strikingly, 88 of the 95 substitutions occurred in groups, and multiple mutations at antigenic sites sped up the fixation process. Our results suggest that positive selection has been ongoing most of the time, not sporadic, and that multiple mutations at antigenic sites cumulatively enhance antigenic drift, indicating that antigenic change is less punctuated than recently proposed.

Indexed as

Evolution, MolecularSelection, GeneticAmino Acid SubstitutionAntigenic VariationComputational BiologyHemagglutininsInfluenza A virusHemagglutinins

Identifiers

PMID17395716
PMCPMC1851070
OpenAlexW2044054342

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.