MicroRNA Expression Signature in Human Glioblastoma Multiforme Brain Tumor
Poster Sep 22, 2005
Dana Ridzon, Ruoying Tan, Julie Nguyen, Adam Broomer, Caifu Chen
Expression of 180 human miRNAs was examined using recently developed stem loop primers for reverse transcription (RT) followed by real-time PCR. MicroRNAs can be quantified from as few as single cells or as little as 25 pg total RNA. The CT values correlated to the copy number over up to seven orders of magnitude. TheTaqMan® miRNA assays discriminated between two miRNAs that differed by as little as a single nucleotide, and between mature miRNAs and their precursors.
This method allows accurate and sensitive miRNA expression profiling and uncovers precise changes of miRNA expression. Comparing to normal human brain, the glioblastoma multiforme (GBM) tumors have a distinct expression signature of miRNAs. Nearly half of miRNAs showed the reduced expression by > 2-folds. In contrast, only 13% miRNAs had increased expression (>2-folds) in GBM. Expression of miR-10a and miR-10b etc. located within class I HOX and miR-129, miR-139,and miR-153 etc. within class II HOX gene clusters is either elevated or reduced (>10-fold), suggesting that these miRNAs may be involved in brain cancers.
Novel Role of the Innate Immune DNA Sensor IFI16 (Interferon Gamma Inducible Protein 16) as a Major Epigenetic Modulator During KSHV Infection and Lytic ReactivationPoster
Studies have shown that IFI16 acts as an antiviral restriction factor against a number of DNA viruses, by inhibiting viral replication or transcription through epigenetic modifications. However, till date, no specific epigenetic function of IFI16 has been identified. Here, we have discovered that IFI16 recruits two histone methyltransferases on the KSHV episome leading to altered Histone H3K9 methylation, thus regulating its lifecycle.READ MORE
A new method for generating arrayed RNAi screening tools for any organismPoster
RNA interference (RNAi) using small interfering RNAs (siRNAs) is an important technology for down-regulation of gene expression and a powerful tool to study cellular processes and pathways. Previously, large collections of siRNAs were available only for traditional experimental model systems, such as human and mouse, and predominantly provided as chemically synthesized libraries.READ MORE
Identification of genes involved in cell cycle regulation using arrayed synthetic CRISPR RNA libraries in a multiparameter high-content assayPoster
Gene knockout using CRISPR-Cas9 has dramatically transformed biological research and has been rapidly applied to loss-of-function screening primarily using pooled lentiviral sgRNA libraries. A synthetic CRISPR RNA (crRNA) approach is amenable to screening in arrayed, well-by-well fashion and expands the types of phenotypic readouts that can be used, including high-content and morphology-based assays.READ MORE
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Epigenetics in the nervous system: development and disease
Oct 01 - Oct 03, 2018