Evidence map›Paper›PMID 18351802›Full record

ArticlePLoS biology2008

Loss of egg yolk genes in mammals and the origin of lactation and placentation.

David Brawand, Walter Wahli, Henrik Kaessmann

Open access · goldAbstract read
In one paragraph

Article in PLoS biology, 2008. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 61 papers.

0numbers the graph read from it
0cells of the map it votes in
61citing papers in PubMed
5.9field-weighted citation impact, top 4% 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

61 citing papers in PubMed, 147 citations in OpenAlex.

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  6. Genomic signatures associated with the evolutionary loss of egg yolk in parasitoid wasps.Proceedings of the National Academy of Sciences of the United States of America · 2025
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  14. Evolution, diversification and function of the maternal-infant dyad in mammalian feeding.Philosophical transactions of the Royal Society of London. Series B, Biological sciences · 2023
    Article
  15. Yolk-deprivedLife science alliance · 2023
    Article
  16. Article
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1 more citing papers are in PubMed but not listed here.

4 · The record

Corrections and comments

5 · Who and what money

Authors and funding

3 authors at 1 institution in 1 country.

David BrawandCenter for Integrative Genomics, University of Lausanne, Lausanne, Switzerland.
Walter Wahli
Henrik Kaessmann
University of Lausanne · CH

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

Embryonic development in nonmammalian vertebrates depends entirely on nutritional reserves that are predominantly derived from vitellogenin proteins and stored in egg yolk. Mammals have evolved new resources, such as lactation and placentation, to nourish their developing and early offspring. However, the evolutionary timing and molecular events associated with this major phenotypic transition are not known. By means of sensitive comparative genomics analyses and evolutionary simulations, we here show that the three ancestral vitellogenin-encoding genes were progressively lost during mammalian evolution (until around 30-70 million years ago, Mya) in all but the egg-laying monotremes, which have retained a functional vitellogenin gene. Our analyses also provide evidence that the major milk resource genes, caseins, which have similar functional properties as vitellogenins, appeared in the common mammalian ancestor approximately 200-310 Mya. Together, our data are compatible with the hypothesis that the emergence of lactation in the common mammalian ancestor and the development of placentation in eutherian and marsupial mammals allowed for the gradual loss of yolk-dependent nourishment during mammalian evolution.

Indexed as

Evolution, MolecularAnimalsBase SequenceCaseinsChickensEgg YolkFemaleGene SilencingGenomeLactationMammalsMarsupialiaMolecular Sequence DataMonotremataPhosphoproteinsPhylogenyCaseinsPhosphoproteinsVitellogenins

Identifiers

PMID18351802
PMCPMC2267819
OpenAlexW2141406340

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.