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Molecular characteristics of the KCNJ5 mutated aldosterone-producing adenomas

Masanori Murakami1, Takanobu Yoshimoto2, Kazuhiko Nakabayashi3

  • 1Department of Molecular Endocrinology and MetabolismGraduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan.

Endocrine-Related Cancer
|July 28, 2017
PubMed

Insights

Aldosterone-producing adenomas (APAs) exhibit molecular heterogeneity based on KCNJ5 mutation status. KCNJ5 mutations in APAs are linked to DNA hypomethylation and altered Wnt signaling and inflammatory pathways.

Area of Science:

  • Endocrinology
  • Molecular Biology
  • Genetics

Background:

  • Aldosterone-producing adenomas (APAs) are a common cause of primary aldosteronism.
  • The role of somatic mutations, such as in KCNJ5, is established in APA pathophysiology.
  • The association between APA mutational status and molecular profiles (transcriptome, methylome) remains unclear.

Purpose of the Study:

  • To investigate the molecular characteristics of APAs based on KCNJ5 mutational status.
  • To compare the transcriptome and methylome of APAs with and without KCNJ5 mutations.
  • To use cortisol-producing adenomas (CPAs) as a reference for comparison.

Main Methods:

  • Transcriptome and methylome analyses were performed on 29 APAs with KCNJ5 mutations, 8 APAs without KCNJ5 mutations, and 5 CPAs.
  • Genome-wide gene expression and CpG methylation profiles were generated from RNA and DNA samples.
  • Cluster analysis was employed to assess molecular heterogeneity.

Main Results:

  • Cluster analysis revealed molecular heterogeneity in APAs correlating with mutational status.
  • APAs with KCNJ5 mutations showed DNA hypomethylation and altered gene expression in Wnt signaling and inflammatory response pathways.
  • Transcriptome data suggested similarities between KCNJ5-mutated APAs and normal adrenal zona glomerulosa.

Conclusions:

  • APA molecular heterogeneity is dependent on mutational status, particularly KCNJ5.
  • KCNJ5 mutations define unique molecular characteristics in APAs.
  • Findings provide insights into the molecular basis of aldosterone production and APA subtypes.
Keywords:
adenomaadrenal cortexgene expressionmolecular genetics

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