Evidence map›Paper›PMID 22763458›Full record

ArticleNature2012

Independent evolution of striated muscles in cnidarians and bilaterians.

Patrick R H Steinmetz, Johanna E M Kraus, Claire Larroux, Jörg U Hammel, Annette Amon-Hassenzahl, Evelyn Houliston, Gert Wörheide, Michael Nickel, Bernard M Degnan, Ulrich Technau

Abstract read
In one paragraph

Article in Nature, 2012. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 123 papers.

0numbers the graph read from it
0cells of the map it votes in
123citing papers in PubMed
34.2field-weighted citation impact, top 1% 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

123 citing papers in PubMed, 247 citations in OpenAlex.

  1. Article
  2. Article
  3. Article
  4. A chromosome-level genome assembly for the colonial marine hydrozoanbioRxiv : the preprint server for biology · 2026
    Article
  5. Decoding cnidarian cell type gene regulation.Nature ecology & evolution · 2026
    Article
  6. Article
  7. Review
  8. Review
  9. Article
  10. Article
  11. Article
  12. Article
  13. The varied functions of the giant muscle scaffold protein obscurin.Frontiers in cell and developmental biology · 2025
    Review
  14. Editorial: Model organisms in embryonic development.Frontiers in cell and developmental biology · 2025
    Article
  15. Article
  16. Musculature of an Early Cambrian cycloneuralian animal.Proceedings. Biological sciences · 2023
    Article
  17. Article
  18. Insights and perspectives on the enigmatic alary muscles of arthropods.Frontiers in cell and developmental biology · 2023
    Review
  19. Review
  20. Evolution of the cardiac dyad.Philosophical transactions of the Royal Society of London. Series B, Biological sciences · 2022
    Review

63 more citing papers are in PubMed but not listed here.

4 · The record

Corrections and comments

5 · Who and what money

Authors and funding

10 authors at 7 institutions in 4 countries.

Patrick R H SteinmetzDepartment for Molecular Evolution and Development, Centre for Organismal Systems Biology, University of Vienna, A-1090 Vienna, Austria.
Johanna E M Kraus
Claire Larroux
Jörg U Hammel
Annette Amon-Hassenzahl
Evelyn Houliston
Gert Wörheide
Michael Nickel
Bernard M Degnan
Ulrich Technau
Ludwig-Maximilians-Universität München · DEUniversity of Vienna · ATBayerische Staatssammlung für Paläontologie und Geologie · DEFriedrich Schiller University Jena · DELaboratoire de Biologie du Développement de Villefranche-sur-Mer · FRTechnical University of Darmstadt · DEThe University of Queensland · AU

Funding

Austrian Science Fund FWF P 21108
6 · The paper itself

Abstract

Striated muscles are present in bilaterian animals (for example, vertebrates, insects and annelids) and some non-bilaterian eumetazoans (that is, cnidarians and ctenophores). The considerable ultrastructural similarity of striated muscles between these animal groups is thought to reflect a common evolutionary origin. Here we show that a muscle protein core set, including a type II myosin heavy chain (MyHC) motor protein characteristic of striated muscles in vertebrates, was already present in unicellular organisms before the origin of multicellular animals. Furthermore, 'striated muscle' and 'non-muscle' myhc orthologues are expressed differentially in two sponges, compatible with a functional diversification before the origin of true muscles and the subsequent use of striated muscle MyHC in fast-contracting smooth and striated muscle. Cnidarians and ctenophores possess striated muscle myhc orthologues but lack crucial components of bilaterian striated muscles, such as genes that code for titin and the troponin complex, suggesting the convergent evolution of striated muscles. Consistently, jellyfish orthologues of a shared set of bilaterian Z-disc proteins are not associated with striated muscles, but are instead expressed elsewhere or ubiquitously. The independent evolution of eumetazoan striated muscles through the addition of new proteins to a pre-existing, ancestral contractile apparatus may serve as a model for the evolution of complex animal cell types.

Indexed as

Biological EvolutionAnimalsCnidariaGene DuplicationGene Expression RegulationMuscle, StriatedMyosin Heavy ChainsPhylogenyMyosin Heavy Chains

Identifiers

PMID22763458
PMCPMC3398149
OpenAlexW2005570641

What OpenQuestion holds

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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.