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Related Experiment Videos

Gene rearrangement in positive patch tests

A Wolff-Sneedorff1, K Thomsen, L Secher

  • 1Department of Dermatology, National University Hospital, Denmark.

Experimental Dermatology
|October 1, 1995
PubMed
Summary
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Southern blot analysis revealed T-cell receptor (TCR) gene rearrangements in benign inflammatory skin conditions, suggesting potential clonality in these disorders. This finding aids in distinguishing reactive from malignant processes.

Area of Science:

  • Immunology
  • Dermatology
  • Molecular Biology

Background:

  • Lymphoproliferative disorders typically exhibit clonal lymphoid infiltrates, unlike benign skin conditions which are usually polyclonal.
  • Southern blot analysis of T-cell receptor (TCR) gene rearrangement is a potential method to differentiate reactive from malignant processes.

Purpose of the Study:

  • To investigate the presence of TCR gene rearrangement in benign reactive skin processes, specifically in positive patch tests from patients with delayed hypersensitivity reactions.
  • To determine if TCR gene rearrangement patterns can help distinguish benign inflammatory conditions from malignant ones.

Main Methods:

  • Biopsies from positive patch tests of patients with delayed hypersensitivity reactions were analyzed using Southern blot.
  • TCR gene rearrangement patterns were examined in DNA samples digested with EcoR1.

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Main Results:

  • An identical gene rearrangement configuration was found in 11 out of 17 patients with positive patch tests, characterized by an extra band at 8.0 Kb.
  • This pattern was absent in patients with malignant diagnoses but present in some patients with other benign diseases.
  • The observed rearrangement pattern did not correlate with the inflammatory response severity or the specific hapten used.

Conclusions:

  • The presence of TCR gene rearrangement in benign inflammatory skin disorders suggests the potential development or presence of clonality.
  • This finding has clinical implications for understanding the spectrum of T-cell clonality in dermatological conditions.