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Related Experiment Videos

PTEN/MMAC1 expression in melanoma resection specimens.

M Deichmann1, M Thome, A Benner

  • 1Department of Dermatology, University Clinics of Heidelberg, Vossstrasse 2, 69115 Heidelberg, Germany. martin_deichmann@med.uni-heidelberg.de

British Journal of Cancer
|November 28, 2002
PubMed
Summary

PTEN/MMAC1 gene alterations may play a role in melanoma development. While mRNA and protein levels were not significantly reduced, mutations were found, potentially affecting tumor suppressor function.

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Area of Science:

  • Oncology
  • Genetics
  • Molecular Biology

Background:

  • PTEN/MMAC1 is a tumor suppressor gene located on chromosome 10q23.3.
  • This region is frequently affected by deletions in melanomas.
  • PTEN/MMAC1 is a candidate tumor suppressor for melanoma.

Purpose of the Study:

  • To investigate the role of PTEN/MMAC1 in melanoma development.
  • To analyze PTEN/MMAC1 expression and mutations in melanoma samples.

Main Methods:

  • Semi-quantitative reverse transcription-polymerase chain reaction (RT-PCR) for mRNA expression.
  • Immunohistochemistry for protein expression.
  • Sequencing of PTEN/MMAC1 cDNAs.

Main Results:

Related Experiment Videos

  • No statistically significant down-regulation of PTEN/MMAC1 mRNA was observed in melanomas compared to nevi.
  • PTEN/MMAC1 protein expression was not lost in melanomas.
  • Three point mutations (all silent) and two nucleotide deletions (frameshifts) were detected in melanoma samples.
  • The frameshift mutations resulted in the loss of a putative PDZ-targeting consensus sequence.

    • Conclusions:

    • Alterations in PTEN/MMAC1, specifically frameshift mutations affecting the C-terminus, may contribute to melanoma development.
    • Loss of the PDZ-targeting motif could impair PTEN/MMAC1 localization and function.
    • PTEN/MMAC1 mutations are implicated in a subset of melanomas.