Methylation analysis of 81 glioma clinical samples (49 CIMP+ and 32 CIMP-) and 53 cell line samples
Ontology highlight
ABSTRACT:
ORGANISM(S): Homo sapiens
SUBMITTER: FANG FANG
PROVIDER: E-GEOD-30338 | biostudies-arrayexpress |
REPOSITORIES: biostudies-arrayexpress
Similar Datasets
Project description:Glioma CIMP (G-CIMP) is a powerful determinant of tumor pathogenicity but the molecular cause of G-CIMP is a fundamental question that is unresolved. Here, we show that mutation of a single gene, isocitrate dehydrogenase 1 (IDH1), directly causes the G-CIMP in gliomas by remodeling the methylome.
2012-02-16 | GSE30338 | GEO
Project description:Glioma CIMP (G-CIMP) is a powerful determinant of tumor pathogenicity but the molecular cause of G-CIMP is a fundamental question that is unresolved. Here, we show that mutation of a single gene, isocitrate dehydrogenase 1 (IDH1), directly causes the G-CIMP in gliomas by remodeling the methylome. In this study 52 glioma clinic samples (36 CIMP+ and 16 CIMP-) were analyzed. Parental IDH1 wild-type and IDH1 mutant cells were passaged 40 and passage 40 were cell line was sent for expression array.
2012-02-16 | E-GEOD-30336 | biostudies-arrayexpress
Project description:Glioma CIMP (G-CIMP) is a powerful determinant of tumor pathogenicity but the molecular cause of G-CIMP is a fundamental question that is unresolved. Here, we show that mutation of a single gene, isocitrate dehydrogenase 1 (IDH1), directly causes the G-CIMP in gliomas by remodeling the methylome.
2012-02-16 | GSE30336 | GEO
Project description:This SuperSeries is composed of the following subset Series: GSE30336: Expression analysis of 52 glioma clinical samples (36 CIMP+ and 16 CIMP-) and 6 cell line samples GSE30338: Methylation analysis of 81 glioma clinical samples (49 CIMP+ and 32 CIMP-) and 53 cell line samples Refer to individual Series
2012-02-16 | E-GEOD-30339 | biostudies-arrayexpress
Project description:Cancer-specific changes in DNA methylation can alter genetic stability, genomic structure, and gene expression. Promoter CpG island methylation can result in transcriptional silencing and plays an important role in the oncogenic process. We used genome-wide analysis to characterize the methylomes of breast cancers with diverse metastatic behavior. Here, we describe the identification of novel groups of breast tumors characterized by the presence or absence of coordinate hypermethylation at a large number of genes, demonstrating the existence of a breast-CpG island methylator phenotype (B-CIMP). B-CIMP imparts a distinct epigenomic profile and is a strong determinant of metastatic potential. Gene Expression Samples (GSM647057-GSM647077): Twenty-one breast cancer primary samples were analyzed. There are 10 CIMP positive and 11 CIMP negative samples. Methylation Profiling Samples (GSM651372-GSM651410): Thirty-nine breast cancer primary samples were analyzed. There are 17 CIMP positive and 22 CIMP negative samples.
2011-03-31 | E-GEOD-26349 | biostudies-arrayexpress
Project description:A method (termed Cellular Imprinting Proteomics, CImP) for the identification and quantification of the ocular surface proteome using a minimally invasive membrane filter device is described. Moreover, The CImP method was applied to profile the molecular alterations in the eyes of infants exposed to Zika virus (ZIKV) infection during gestation.
2020-07-23 | PXD014038 | Pride
Project description:The cytosolic NADP+-dependent isocitrate dehydrogenase IDH1 is frequently mutated in human cancers. Recent studies have shown that IDH1 mutant primary glioblastomas (GBM) and acute myeloid leukemias (AML) display robust association with CpG island methylator phenotype (CIMP). Such observations bring into question whether IDH1 mutations directly contribute to the development of CIMP or if the hypermethylation phenotype precedes acquisition of IDH1 mutations. To reveal the effects of IDH1 mutations on DNA methylation and gene expression, we introduced the most frequently observed IDH1 mutation, R132H, into a human cancer cell line through gene targeting. We profiled changes in methylation at over 27,000 CpG dinucleotides spanning 14,475 unique gene regions and characterized genome-wide gene expression alterations resulting from IDH1R132H knockin. We observed consistent changes in both DNA methylation and gene expression when comparing two independent IDH1R132H knockin clones to their wild-type parent, and report hypermethylation of over 2,000 loci, the majority of which contained preexisting methylation in IDH1WT parental cells. These loci exhibit the same trend in primary TCGA glioblastoma tumors with mutant IDH1 as compared to those with wild-type IDH1 and have significant overlap with genes hypermethylated in glioma-CIMP+ tumors. Furthermore, we identify specific DNA methylation and gene expression alterations which correlate with IDH1 mutations in our cell-line model as well as primary glioblastomas, including hypermethylation and transcriptional silencing of RBP1. The presented data provide insight on epigenetic alterations induced by IDH1 mutations and support a contributory role for IDH1 mutants in regulation of DNA methylation and gene expression in human cancer cells. Comparison of IDH1 R132H and wild-type HCT116 cells as well as HOG cells overexpressing either wild-type IDH1 or IDH1 R132H
2012-08-13 | E-GEOD-31133 | biostudies-arrayexpress
Project description:The CpG island methylator phenotype (CIMP) in colorectal tumors can be recognized by an increased frequency of aberrant methylation in a specific set of genomic loci. Because of the strong association of CIMP with high microsatellite instability (MSI-H), the identification of CIMP+ tumors within microsatellite stable (MSS) colorectal cancers may not be straightforward. To overcome this potential limitation, we have built an improved 7-loci set of methylation markers that includes CACNA1G, IGF2, RUNX3, HTR6, RIZ1, MINT31 and MAP1B. This new set of CIMP markers revealed a bimodal distribution of methylation frequencies in a group of 95 MSS colorectal cancers, which allowed a clearer separation between CIMP classes. Correlation of CIMP+ tumors with bio-pathological traits revealed significant associations with location to the proximal colon, mucinous histology and chromosomal stability. Although not statistically significant, a trend toward an adverse prognosis for CIMP+ cases was observed. Microarray analysis revealed that CIMP+ tumors are characterized by a unique expression profile, a result that confirms that CIMP+ tumors represent a distinct molecular class within MSS colorectal cancers. Moreover, our results suggest that this expression pattern may represent the molecular background for the development of CIMP+ tumors that, in turn, develop MSI when aberrant methylation occurs at the MLH1 gene promoter.
2008-01-01 | E-TABM-328 | biostudies-arrayexpress
Project description:The cytosolic NADP+-dependent isocitrate dehydrogenase IDH1 is frequently mutated in human cancers. Recent studies have shown that IDH1 mutant primary glioblastomas (GBM) and acute myeloid leukemias (AML) display robust association with CpG island methylator phenotype (CIMP). Such observations bring into question whether IDH1 mutations directly contribute to the development of CIMP or if the hypermethylation phenotype precedes acquisition of IDH1 mutations. To reveal the effects of IDH1 mutations on DNA methylation and gene expression, we introduced the most frequently observed IDH1 mutation, R132H, into a human cancer cell line through gene targeting. We profiled changes in methylation at over 27,000 CpG dinucleotides spanning 14,475 unique gene regions and characterized genome-wide gene expression alterations resulting from IDH1R132H knockin. We observed consistent changes in both DNA methylation and gene expression when comparing two independent IDH1R132H knockin clones to their wild-type parent, and report hypermethylation of over 2,000 loci, the majority of which contained preexisting methylation in IDH1WT parental cells. These loci exhibit the same trend in primary TCGA glioblastoma tumors with mutant IDH1 as compared to those with wild-type IDH1 and have significant overlap with genes hypermethylated in glioma-CIMP+ tumors. Furthermore, we identify specific DNA methylation and gene expression alterations which correlate with IDH1 mutations in our cell-line model as well as primary glioblastomas, including hypermethylation and transcriptional silencing of RBP1. The presented data provide insight on epigenetic alterations induced by IDH1 mutations and support a contributory role for IDH1 mutants in regulation of DNA methylation and gene expression in human cancer cells. Comparison of IDH1 R132H and wild-type HCT116 cells
2012-08-13 | E-GEOD-31126 | biostudies-arrayexpress
Project description:The cytosolic NADP+-dependent isocitrate dehydrogenase IDH1 is frequently mutated in human cancers. Recent studies have shown that IDH1 mutant primary glioblastomas (GBM) and acute myeloid leukemias (AML) display robust association with CpG island methylator phenotype (CIMP). Such observations bring into question whether IDH1 mutations directly contribute to the development of CIMP or if the hypermethylation phenotype precedes acquisition of IDH1 mutations. To reveal the effects of IDH1 mutations on DNA methylation and gene expression, we introduced the most frequently observed IDH1 mutation, R132H, into a human cancer cell line through gene targeting. We profiled changes in methylation at over 27,000 CpG dinucleotides spanning 14,475 unique gene regions and characterized genome-wide gene expression alterations resulting from IDH1R132H knockin. We observed consistent changes in both DNA methylation and gene expression when comparing two independent IDH1R132H knockin clones to their wild-type parent, and report hypermethylation of over 2,000 loci, the majority of which contained preexisting methylation in IDH1WT parental cells. These loci exhibit the same trend in primary TCGA glioblastoma tumors with mutant IDH1 as compared to those with wild-type IDH1 and have significant overlap with genes hypermethylated in glioma-CIMP+ tumors. Furthermore, we identify specific DNA methylation and gene expression alterations which correlate with IDH1 mutations in our cell-line model as well as primary glioblastomas, including hypermethylation and transcriptional silencing of RBP1. The presented data provide insight on epigenetic alterations induced by IDH1 mutations and support a contributory role for IDH1 mutants in regulation of DNA methylation and gene expression in human cancer cells.
2012-08-14 | GSE31133 | GEO