Evidence map›Paper›PMID 34824770›Full record

ReviewEcology and evolution2021

(Non)Parallel developmental mechanisms in vertebrate appendage reduction and loss.

Samantha Swank, Thomas J Sanger, Yoel E Stuart

Abstract readReview
In one paragraph

Review in Ecology and evolution, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 9 papers.

0numbers the graph read from it
0cells of the map it votes in
9citing papers in PubMed
–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

9 citing papers in PubMed.

  1. Models in Evo-Devo: An Evolving Niche.Results and problems in cell differentiation · 2026
    Review
  2. Article
  3. Zoological research · 2025
    Article
  4. Article
  5. Article
  6. Article
  7. Article
  8. Article
  9. Review
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.

Samantha SwankDepartment of Biology Loyola University Chicago Chicago Illinois USA.ORCID https://orcid.org/0000-0003-3170-9672
Thomas J SangerDepartment of Biology Loyola University Chicago Chicago Illinois USA.
Yoel E StuartDepartment of Biology Loyola University Chicago Chicago Illinois USA.

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

Appendages have been reduced or lost hundreds of times during vertebrate evolution. This phenotypic convergence may be underlain by shared or different molecular mechanisms in distantly related vertebrate clades. To investigate, we reviewed the developmental and evolutionary literature of appendage reduction and loss in more than a dozen vertebrate genera from fish to mammals. We found that appendage reduction and loss was nearly always driven by modified gene expression as opposed to changes in coding sequences. Moreover, expression of the same genes was repeatedly modified across vertebrate taxa. However, the specific mechanisms by which expression was modified were rarely shared. The multiple routes to appendage reduction and loss suggest that adaptive loss of function phenotypes might arise routinely through changes in expression of key developmental genes.

Indexed as

convergenceevolutionary developmentgene regulatory networksHedgehogHox geneslimb lossPitx1

Identifiers

PMID34824770
PMCPMC8601893

What OpenQuestion holds

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LicenceCC BY
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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.