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Transcription profiling of human MCF-7 breast cancer cells - glycodelin-induced changes

ABSTRACT: Recent reports suggest that glycodelin induces epithelial differentiation. Little is known about the mechanisms involved in this process. To elucidate this we transfected glycodelin-negative MCF-7 breast cancer cells with glycodelin cDNA. Cells transfected with a vector in which glycodelin cDNA was in antisense orientation were used as non-glycodelin-producing controls. Oligo microarray was performed to study gene expression changes between glycodelin-transfected and control cells. Experiment Overall Design: Gene expression differences between MCF-7 breast cancer cells transfected with glycodelin cDNA and the cells transfected with a vector in which glycodelin cDNA was in antisense orientation were studied by oligo microarray.

ORGANISM(S): Homo sapiens

SUBMITTER: Koistinen Hannu

PROVIDER: S-ECPF-GEOD-7771 | biostudies-other |

REPOSITORIES: biostudies-other

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Project description:We used microarrays to detail the global programme of gene expression for MCF-7 and MDA-MB-231 and revealed the correlation between the methylation state of various genomic components and gene expression level. The expression analyses of the two breast cancer cell lines are a part of the whole study. The summary of our study is as follows: We establish a technique, called modified methylation-specific digital karyotyping (MMSDK) based on methylation-specific digital karyotyping (MSDK) with a novel sequencing approach. Briefly, after a tandem digestion of genomic DNA with a methylation-sensitive mapping enzyme and a fragmenting enzyme, short sequence tags are obtained. These tags are amplified, followed by direct, massively parallel sequencing (Solexa 1G Genome Analyzer). This method allows high-throughput and low-cost genome-wide DNA methylation mapping. We applied this method to investigate global DNA methylation profiles for widely used breast cancer cell lines, MCF-7 and MDA-MB-231, which are representatives for luminal-like and mesenchymal-like cancer types, respectively. By comparison, a highly similar overall DNA methylation pattern was revealed for the two cell lines. However a cohort of individual genomic loci with significantly different DNA methylation profile between two cell lines was identified. Furthermore, we revealed a genome-wide significant correlation between gene expression and the methylation status of gene promoters with CpG islands (CGIs) in the two cancer cell lines, and a correlation of gene expression and the methylation status of promoters without CGIs in MCF-7 cells. Experiment Overall Design: Breast cancer cell lines, MCF-7 and MDA-MB-231, were selected for the study of the impact of DNA methylation on gene expression regulation. Total RNA extraction was performed for both cell lines and hybridization was carried out using Affymetrix microarrays. We developed a modified methylation-specific digital karyotyping (MSDK) to obtain DNA methylation profiling genome wide. Then, we combined the analysis of DNA methylation data and gene expression data to reveal a correlation between epigenetic and transcriptional features genome wide.

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Transcription profiling of human MCF-7 breast cancer cells - glycodelin-induced changes

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