ArticleProceedings. Biological sciences2016
Microscopic and immunohistochemical analyses of the claw of the nesting dinosaur, Citipati osmolskae.
Article in Proceedings. Biological sciences, 2016. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 9 papers.
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Who cites it
9 citing papers in PubMed, 25 citations in OpenAlex.
- Preservation of proteins in the geosphere.Nature ecology & evolution · 2024Review
- Review
- Combining elemental and immunochemical analyses to characterize diagenetic alteration patterns in ancient skeletal remains.Scientific reports · 2022Article
- Corneous beta proteins of the epidermal differentiation complex (EDC) form large part of the corneous material of claws and rhamphothecae in turtles.Protoplasma · 2020Article
- Inferring lifestyle for Aves and Theropoda: A model based on curvatures of extant avian ungual bones.PloS one · 2020Article
- The molecular evolution of feathers with direct evidence from fossils.Proceedings of the National Academy of Sciences of the United States of America · 2019Article
- Preservation potential of keratin in deep time.PloS one · 2018Article
- Biochemistry and adaptive colouration of an exceptionally preserved juvenile fossil sea turtle.Scientific reports · 2017Article
- Disparities in correlating microstructural to nanostructural preservation of dinosaur femoral bones.Scientific reports · 2017Article
Corrections and comments
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Authors and funding
3 authors at 2 institutions in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
One of the most well-recognized Cretaceous fossils is Citipati osmolskae (MPC-D 100/979), an oviraptorid dinosaur discovered in brooding position on a nest of unhatched eggs. The original description refers to a thin lens of white material extending from a manus ungual, which was proposed to represent original keratinous claw sheath that, in life, would have covered it. Here, we test the hypothesis that this exceptional morphological preservation extends to the molecular level. The fossil sheath was compared with that of extant birds, revealing similar morphology and microstructural organization. In living birds, the claw sheath consists primarily of two structural proteins; alpha-keratin, expressed in all vertebrates, and beta-keratin, found only in reptiles and birds (sauropsids). We employed antibodies raised against avian feathers, which comprise almost entirely of beta-keratin, to demonstrate that fossil tissues respond with the same specificity, though less intensity, as those from living birds. Furthermore, we show that calcium chelation greatly increased antibody reactivity, suggesting a role for calcium in the preservation of this fossil material.
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