
<lom:lom xmlns:lom="https://oer-repo.uibk.ac.at/lom" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="https://oer-repo.uibk.ac.at/lom/latest https://w3id.org/oerbase/profiles/lomuibk/latest/schemas/lom-uibk.xsd">
  
<lom:general>
  
<lom:identifier>
  
<lom:catalog>phaidra.vetmeduni.ac.at</lom:catalog>

  
<lom:entry>
  
<lom:langstring xml:lang="x-none">o:5368</lom:langstring>

  
</lom:entry>

  
</lom:identifier>

  
<lom:identifier>
  
<lom:catalog>DOI</lom:catalog>

  
<lom:entry>
  
<lom:langstring xml:lang="x-none">10.3390/jdb14010001</lom:langstring>

  
</lom:entry>

  
</lom:identifier>

  
<lom:title>
  
<lom:langstring xml:lang="en">The Epithelial Egg Tooth of the Chicken Shares Protein Markers with the Embryonic Subperiderm and Feathers</lom:langstring>

  
</lom:title>

  
<lom:description>
  
<lom:langstring xml:lang="en">The epithelial egg tooth is used by birds to open the eggshell for hatching. This ectodermal structure consists of a multilayered periderm and a hard cornified portion, the caruncle or actual egg tooth. Here, we determined the protein composition of the egg tooth of the chicken and compared the proteins to markers of other epithelia identified in previous studies. The egg tooth and the upper beak of chicken embryos of Hamburger and Hamilton (HH) stage 44 were subjected to mass spectrometry-based proteomics. We found that scaffoldin, a marker of the embryonic periderm and the feather sheath, was enriched in the egg tooth relative to the beak. Likewise, Epidermal Differentiation protein containing DPCC Motifs (EDDM) and Epidermal Differentiation protein starting with a MTF motif and rich in Histidine (EDMTFH), which had previously been characterized as markers of the subperiderm on embryonic scutate scales and the barbs of feathers, were also enriched in the egg tooth. The expression of EDDM and EDMTFH was confirmed RT-PCR analysis. Our data suggest that the epithelial egg tooth is related to the subperiderm and feathers, a hypothesis with potentially important implications for the evolution of the avian integument.</lom:langstring>

  
</lom:description>

  
<lom:language>eng</lom:language>

  
<lom:keyword>
  
<lom:langstring xml:lang="en">Skin Appendages</lom:langstring>

  
</lom:keyword>

  
<lom:keyword>
  
<lom:langstring xml:lang="en">Egg Tooth</lom:langstring>

  
</lom:keyword>

  
<lom:keyword>
  
<lom:langstring xml:lang="en">Feathers</lom:langstring>

  
</lom:keyword>

  
<lom:keyword>
  
<lom:langstring xml:lang="en">Keratinocytes</lom:langstring>

  
</lom:keyword>

  
<lom:keyword>
  
<lom:langstring xml:lang="en">Differentiation</lom:langstring>

  
</lom:keyword>

  
<lom:keyword>
  
<lom:langstring xml:lang="en">Cornification</lom:langstring>

  
</lom:keyword>

  
<lom:keyword>
  
<lom:langstring xml:lang="en">Keratin</lom:langstring>

  
</lom:keyword>

  
<lom:keyword>
  
<lom:langstring xml:lang="en">Periderm</lom:langstring>

  
</lom:keyword>

  
<lom:keyword>
  
<lom:langstring xml:lang="en">Hatching</lom:langstring>

  
</lom:keyword>

  
<lom:keyword>
  
<lom:langstring xml:lang="en">Birds</lom:langstring>

  
</lom:keyword>

  
</lom:general>

  
<lom:lifecycle>
  
<lom:datetime>2026-07-23T10:01:47.105Z</lom:datetime>

  
<lom:contribute>
  
<lom:role>
  
<lom:source>
  
<lom:langstring xml:lang="x-none">LOMv1.0</lom:langstring>

  
</lom:source>

  
<lom:value>
  
<lom:langstring xml:lang="x-none">Author</lom:langstring>

  
</lom:value>

  
</lom:role>

  
<lom:centity>
  
<lom:vcard>BEGIN:VCARD
VERSION:3.0
N:Sachslehner;Attila Placido;
FN:Attila Placido Sachslehner
X-ORCID:https://orcid.org/0000-0003-1447-9254
END:VCARD</lom:vcard>

  
</lom:centity>

  
<lom:centity>
  
<lom:vcard>BEGIN:VCARD
VERSION:3.0
N:Steinbinder;Julia;
FN:Julia Steinbinder
END:VCARD</lom:vcard>

  
</lom:centity>

  
<lom:centity>
  
<lom:vcard>BEGIN:VCARD
VERSION:3.0
N:Hess;Claudia;
FN:Claudia Hess
X-ORCID:https://orcid.org/0000-0002-3535-5157
END:VCARD</lom:vcard>

  
</lom:centity>

  
<lom:centity>
  
<lom:vcard>BEGIN:VCARD
VERSION:3.0
N:Mlitz;Veronika;
FN:Veronika Mlitz
END:VCARD</lom:vcard>

  
</lom:centity>

  
<lom:centity>
  
<lom:vcard>BEGIN:VCARD
VERSION:3.0
N:Eckhart;Leopold;
FN:Leopold Eckhart
X-ORCID:https://orcid.org/0000-0002-5645-2036
END:VCARD</lom:vcard>

  
</lom:centity>

  
</lom:contribute>

  
</lom:lifecycle>

  
<lom:educational>
  
<lom:learningresourcetype>
  
<lom:source>
  
<lom:langstring xml:lang="x-none">https://w3id.org/kim/hcrt/scheme</lom:langstring>

  
</lom:source>

  
<lom:id>https://w3id.org/kim/hcrt/text</lom:id>

  
<lom:entry>
  
<lom:langstring xml:lang="de">Textdokument</lom:langstring>

  
<lom:langstring xml:lang="en">Text</lom:langstring>

  
</lom:entry>

  
</lom:learningresourcetype>

  
</lom:educational>

  
<lom:rights>
  
<lom:copyrightandotherrestrictions>
  
<lom:source>
  
<lom:langstring xml:lang="x-none">LOMv1.0</lom:langstring>

  
</lom:source>

  
<lom:value>
  
<lom:langstring xml:lang="x-none">yes</lom:langstring>

  
</lom:value>

  
</lom:copyrightandotherrestrictions>

  
<lom:description>
  
<lom:langstring xml:lang="x-t-cc-url">https://creativecommons.org/licenses/by/4.0</lom:langstring>

  
</lom:description>

  
</lom:rights>

  
<lom:technical>
  
<lom:format>application/pdf</lom:format>

  
<lom:size>1364184</lom:size>

  
<lom:location>https://phaidra.vetmeduni.ac.at/o:5368</lom:location>

  
<lom:thumbnail>
  
<lom:url>https://phaidra.vetmeduni.ac.at/api/object/o:5368/thumbnail</lom:url>

  
</lom:thumbnail>

  
</lom:technical>

  
<lom:classification>
  
<lom:purpose>
  
<lom:source>
  
<lom:langstring xml:lang="x-none">LOMv1.0</lom:langstring>

  
</lom:source>

  
<lom:value>
  
<lom:langstring xml:lang="x-none">discipline</lom:langstring>

  
</lom:value>

  
</lom:purpose>

  
</lom:classification>

  
</lom:lom>