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A Keratin 12 Expression-Based Analysis of Stem-Precursor Cells and Differentiation in the Limbal-Corneal Epithelium

J Mario Wolosin1

  • 1Department of Ophthalmology, Black Family Stem Cell Institute and Vision Research Institute, Icahn School of Medicine at Mount Sinai, One Gustave Levy Place, New York, NY 10029, USA.

Biology
|March 27, 2024
PubMed
Summary

This study maps corneal epithelial cell differentiation using scRNA-Seq, identifying distinct gene expression stages from limbal stem cells to central cornea cells. It reveals key gene cohorts associated with early and late differentiation.

Keywords:
Krt12corneadifferentiationepitheliumgene expressionlimbusscRNA-Seqstem cells

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Area of Science:

  • Ophthalmology
  • Cell Biology
  • Genomics

Background:

  • The corneal epithelium (CE) maintains ocular surface integrity through continuous cell migration and differentiation.
  • Stem/progenitor cells in the limbus generate mature cells migrating towards the central cornea.
  • Cellular differentiation is marked by specific gene expression patterns, such as Krt12.

Purpose of the Study:

  • To delineate the sequential gene expression changes during corneal epithelial differentiation.
  • To identify gene cohorts associated with limbal stem/progenitor cells and differentiation progression.
  • To understand the molecular mechanisms underlying CE development and homeostasis.

Main Methods:

  • Single-cell RNA sequencing (scRNA-Seq) was employed to analyze gene expression profiles across the corneal epithelium.
  • Differential gene expression analysis was performed to identify genes up- or down-regulated during differentiation.
  • Correlation analysis was used to link gene expression patterns with Krt12 expression levels.

Main Results:

  • Krt12 expression increases in four distinct steps within the limbus and continuously in the cornea, defining differentiation stages.
  • Identification of gene cohorts with maximal expression in primitive, Krt12-negative cells, likely representing stem/progenitor populations.
  • Discovery of gene sets exhibiting continuous changes and genes correlated with Krt12 expression throughout differentiation.

Conclusions:

  • The study provides a comprehensive map of CE differentiation stages based on distinct gene expression profiles.
  • Key molecular signatures of corneal stem/progenitor cells and differentiation trajectories were identified.
  • This provides a foundation for understanding corneal development and diseases related to epithelial dysfunction.