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Expression of a complex developmental antigen in precise morphogenetic processes during chick embryogenesis.

Jean Duchaine1,2, Sylvain Levasseur1,2, Michel Vincent1,2

  • 1Ontogénèse et Génétique moléculaires, Centre de Recherche du CHUL, 2705 boul. Laurier, Ste-Foy, GIV 4G2, Québec, Canada.

Roux'S Archives of Developmental Biology : the Official Organ of the EDBO
|March 18, 2017
PubMed
Summary

Researchers identified a novel macromolecular complex, A7H2-antigen, crucial for embryonic development. This antigen is transiently expressed in specific embryonic tissues during morphogenetic events, suggesting a role in cell-cell interactions.

Keywords:
A7H2Chick embryoMonoclonal antibodiesMorphogenesis

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Area of Science:

  • Developmental Biology
  • Molecular Biology
  • Immunology

Background:

  • Identifying transient molecules is key to understanding specific developmental events.
  • Monoclonal antibodies are valuable tools for detecting novel embryonic antigens.

Purpose of the Study:

  • To identify and characterize transient molecules involved in chick embryo development.
  • To investigate the role of a specific epitope (A7H2) expressed during morphogenetic processes.

Main Methods:

  • Generation of monoclonal antibodies against chick embryo structures.
  • Immunohistochemistry to detect A7H2 epitope expression in embryonic tissues.
  • Biochemical characterization of the A7H2 antigen using SDS-PAGE, immunoblotting, and fingerprint analysis.
  • Cell culture and immunofluorescence to determine antigen localization.

Main Results:

  • A7H2 antibody recognized an epitope transiently expressed in splanchnomesoderm, mesothelia, and invaginating epithelia during organogenesis.
  • The amnion showed persistent A7H2 reactivity, serving as a source for antigen characterization.
  • The A7H2 antigen is a large molecular complex (pI 5) located on the cytoplasmic face of the plasma membrane.
  • Proteolytic treatments altered the high molecular weight pattern, and fingerprint analysis revealed relationships between peptide bands.

Conclusions:

  • The A7H2 antigen is a macromolecular complex involved in precise morphogenetic processes during embryonic development.
  • Its localization on the cytoplasmic face of the plasma membrane suggests a role in linking the cell to the external environment or as a membrane-associated structure.