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Cytotoxic Edema: Pathophysiology

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Related Experiment Video

Updated: Jun 12, 2026

Isolation of Human Lymphatic Endothelial Cells by Multi-parameter Fluorescence-activated Cell Sorting
07:36

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Published on: May 1, 2015

GJC2 missense mutations cause human lymphedema.

Robert E Ferrell1, Catherine J Baty, Mark A Kimak

  • 1Department of Human Genetics, Graduate School of Public Health, University of Pittsburgh, Pittsburgh, PA 15261, USA.

American Journal of Human Genetics
|June 12, 2010
PubMed
Summary

Genetic mutations in GJC2 cause inherited lymphedema by disrupting lymphatic function. This discovery opens avenues for new therapies targeting gap junctions in lymphatic endothelial cells.

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Last Updated: Jun 12, 2026

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Area of Science:

  • Genetics
  • Cell Biology
  • Medical Science

Background:

  • Lymphedema results from lymphatic system defects.
  • Inherited lymphedema is linked to developmental genes, but functional genes remain uncharacterized.
  • Connexins and gap junctions are crucial for lymphatic function.

Purpose of the Study:

  • To investigate the genetic basis of inherited lymphedema.
  • To identify novel genes involved in lymphatic function.
  • To explore the role of connexins in lymphedema pathogenesis.

Main Methods:

  • Sequencing of GJA1, GJA4, and GJC2 in families with dominant lymphedema.
  • Genetic analysis including LOD score calculation.
  • Comparison of gene expression in lymphatic vs. blood endothelial cells.

Main Results:

  • Identified six probands with unique missense mutations in GJC2 (connexin 47).
  • Confirmed cosegregation of lymphedema and GJC2 mutations in two families (LOD score = 6.5).
  • GJC2 mutations, previously linked to dysmyelination, are now associated with primary lymphedema.

Conclusions:

  • Missense mutations in GJC2 disrupt gap junction function, impairing lymphatic flow.
  • GJC2 mutations represent a novel genetic cause of primary lymphedema.
  • Targeting gap junctions may offer new therapeutic strategies for lymphedema.