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Effects of γ‐glutamyl hydrolase modulation on CpG promoter DNA methylation and gene expression in human colon cancer cells
Author(s) -
Kim SungEun,
Hinoue Toshinori,
Kim Michael,
Sohn KyoungJin,
Cho Robert,
Weisenberger Daniel,
Laird Peter W.,
Kim YoungIn
Publication year - 2013
Publication title -
the faseb journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.709
H-Index - 277
eISSN - 1530-6860
pISSN - 0892-6638
DOI - 10.1096/fasebj.27.1_supplement.640.18
Subject(s) - dna methylation , cpg site , biology , gene , methylation , gene expression , microbiology and biotechnology , promoter , regulation of gene expression , epigenetics of physical exercise , genetics
γ‐Glutamyl hydrolase (GGH) plays an important role in folate homeostasis by catalyzing hydrolysis of polyglutamylated folate into monoglutamates, thereby facilitating export of folate from cell. We investigated whether GGH modulation would affect CpG promoter methylation and gene expression profiles in human HCT116 colon cancer cells. Illumina HT‐12 and Infinium Methylation assay were performed in the GGH‐modulated HCT116 cells, and Ingenuity Pathway Analysis was used for functional analysis. The mRNA expression of selected genes, expression of which was epigenetically regulated was confirmed by qRT‐PCR. We identified 153 differentially expressed genes (most involved pathways: cellular movement and cell death) associated with GGH overexpression, and 321 differentially expressed genes (most involved pathways: cell death and cell cycle) associated with GGH inhibition. 905 and 1869 genes showed altered CpG promoter methylation associated with GGH overexpression and inhibition, respectively. An integrated analysis revealed 5 and 16 genes, expression of which was regulated by CpG promoter methylation changes associated with GGH overexpression and inhibition, respectively. Thus, GGH modulation can affect differential gene expression and CpG promoter DNA methylation involved in important biological pathways and some of the observed altered gene expression appear to be epigenetically regulated. Grant Funding Source : CIHR Fund 14126