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SDHC Methylation Pattern in Patients With Carney Triad.

Magdalena Daumova1,2, Marian Svajdler1,2, Pavel Fabian3

  • 1Sikl's Institute of Pathology, Faculty of Medicine and Teaching Hospital in Plzen, Charles University.

Applied Immunohistochemistry & Molecular Morphology : AIMM
|February 24, 2021
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Carney triad involves tumors linked to mitochondrial succinate dehydrogenase deficiency. This study found SDHC promoter hypermethylation in Carney triad tumors and gastric tissue, suggesting somatic mosaicism as a cause for multifocal tumors.

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Area of Science:

  • Oncology
  • Epigenetics
  • Genetics

Background:

  • Carney triad is a rare syndrome characterized by multifocal gastric tumors, paragangliomas, and pulmonary chondromas.
  • Tumors in Carney triad exhibit a deficiency in the succinate dehydrogenase (SDH) enzyme complex.
  • This deficiency is linked to epigenetic silencing of the SDHC gene via promoter hypermethylation.

Purpose of the Study:

  • To investigate the anatomical distribution of SDHC promoter methylation in Carney triad patients.
  • To explore the potential role of epigenetic changes in the development and multifocality of Carney triad tumors.

Main Methods:

  • Analysis of neoplastic and non-neoplastic tissues from 3 Carney triad patients.
  • Testing for SDHC promoter hypermethylation across various tissue types.

Main Results:

  • SDHC promoter hypermethylation was confirmed in all studied tumors.
  • Non-neoplastic lymphoid and duodenal tissues lacked SDHC epigenetic silencing.
  • Non-neoplastic gastric wall tissue showed SDHC promoter hypermethylation.

Conclusions:

  • Findings support the hypothesis of postzygotic somatic mosaicism in Carney triad.
  • SDHC promoter hypermethylation in the gastric wall may explain multifocal gastric tumors.
  • The exact mechanism for organ-specific tumor distribution in Carney triad remains undetermined.