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NFI-C2 temporal-spatial expression and cellular localization pattern during tooth formation.

Ejvis Lamani1,2, Jelica Gluhak-Heinrich3, Mary MacDougall2

  • 1Department of Orthodontics, School of Dentistry, University of Alabama at Birmingham, 1720 2nd Ave South, Birmingham, Alabama, USA.

Development, Growth & Differentiation
|December 22, 2015
PubMed
Summary

Nuclear factor I-C2 (NFI-C2) protein is crucial for tooth development, not just root formation. This study maps its expression, revealing roles from early stages through to mature root structures.

Keywords:
NFI-CNFI-C2cellular localizationroot developmenttooth formation

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Area of Science:

  • Developmental Biology
  • Molecular Biology
  • Dental Research

Background:

  • Critical signaling pathways in later tooth development, particularly root formation, remain poorly understood.
  • NFI-C transcription factor is implicated in root development, as shown by NFI-C null mice lacking molar roots.
  • Three NFI-C isoforms are expressed in dental tissues, with NFI-C2 being the predominant transcript, but its protein expression pattern is uncharacterized.

Purpose of the Study:

  • To characterize the temporal-spatial expression pattern of the NFI-C2 protein during odontogenesis.
  • To determine the sub-cellular localization of NFI-C2 within dental cells.
  • To investigate the broader role of NFI-C2 in tooth formation beyond root development.

Main Methods:

  • Production and characterization of an isoform-specific NFI-C2 peptide antibody.
  • In situ hybridization and immunohistochemistry using isoform-specific probes.
  • Analysis of temporal-spatial expression and sub-cellular localization of NFI-C2 protein in dental cells.

Main Results:

  • Moderate NFI-C2 staining was detected early in the condensing dental ectomesenchyme, intensifying in the dental pulp and odontoblasts later.
  • NFI-C2 was expressed in the dental epithelium, ameloblasts, stratum intermedium, Hertwig's epithelial root sheath, and mature root tissues.
  • Cellular NFI-C2 staining was observed in the cytosol (associated with Golgi) and nucleus.

Conclusions:

  • NFI-C2 protein exhibits a broad expression pattern throughout tooth development, from early stages to mature root structures.
  • The sub-cellular localization includes cytosolic and nuclear compartments, suggesting diverse functional roles.
  • These findings indicate a more extensive role for NFI-C in tooth formation than previously limited to root and periodontal ligament development.