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Analysis of the dynamic aberrant landscape of DNA methylation and gene expression during arsenic-induced cell

Francisco M Barajas-Olmos1, Elizabeth Ortiz-Sánchez2, Ivan Imaz-Rosshandler3

  • 1Laboratorio de Inmunogenómica y Enfermedades Metabólicas, Instituto Nacional de Medicina Genómica, Ciudad de México, Mexico.

Gene
|June 27, 2019
PubMed

Insights

Chronic arsenic exposure causes cancer by altering DNA methylation and gene expression. This study identifies key epigenetic changes during cellular transformation, offering a new method for detecting epigenomic dysregulation.

Area of Science:

  • Environmental Toxicology
  • Epigenetics
  • Cancer Research

Background:

  • Inorganic arsenic is a known carcinogen linked to various cancers.
  • Mechanisms of arsenic-induced carcinogenesis, particularly epigenetic alterations, require further investigation.
  • The impact of epigenetic changes on gene expression during arsenic exposure is not fully understood.

Purpose of the Study:

  • To investigate alterations in DNA methylation and gene expression in HaCaT cells during arsenic-induced transformation.
  • To explore the role of epigenetic dysregulation in arsenic carcinogenesis.
  • To develop a method for identifying epigenomic dysregulation.

Main Methods:

  • Utilized microarray data to analyze DNA methylation and gene expression.
  • Applied multivariate clustering analysis within a Gaussian mixture model.
  • Grouped genes based on methylation and expression status to identify changes during cellular transformation.

Main Results:

  • Successfully described alterations in DNA methylation around promoter regions.
  • Detailed the impact of these methylation changes on gene expression.
  • Identified specific epigenetic changes occurring during arsenic-induced cellular transformation.

Conclusions:

  • Epigenetic dysregulation, specifically altered DNA methylation and gene expression, plays a significant role in arsenic-induced carcinogenesis.
  • The developed clustering approach provides a valuable method for identifying epigenomic dysregulation.
  • This research enhances understanding of the molecular mechanisms underlying arsenic's carcinogenic effects.
Keywords:
ArsenicCell transformationDNA methylationEpigenetic regulationGene expression

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