Inside the DNA Methylation-Chromatin TangoApril 1, 2009There has been a ton of interesting data on the relationship between DNA methylation, histone modifications, and transcriptional control in recent years. We love hearing about these advances at conferences, but die-hard chromatin biologists tend to rattle off histone modification combos that sound like a football quarterback about to take a snap “H3K27-trimethyl, K9, hike…,” […]
Promoter Targeted Small RNAs Lay a Big Smack Down on Gene Expression.March 31, 2009Sometimes to get the correct result, a researcher needs to knock a gene down. Not just a little knockdown, but like a Mike Tyson knockdown! (well, at least back in the days before the whole ear-biting thing.) Some clever scientists at The Scripps Research Institute may have found a way to do just that. By […]
RNAi Rescues DNA Methylation DefectsMarch 25, 2009Nowadays it seems like “interference” carries such negative connotations. RNAs aren’t really big meddlers. In fact, it’s RNAi that’s protecting genomes against the transgenerational loss of DNA methylation. A team of researchers in France and Spain has demonstrated that in Arabidopsis, the RNA interference (RNAi) machinery can remethylate target sequences that were hypomethylated by mutation […]
The PSA Debate and DNA Methylation BiomarkersMarch 25, 2009For many men, nothing can kick off a mid-life crisis quicker than a prostate exam. Middle-aged guys in sports cars everywhere dread reminders from their urologist for prostate checkups. Don’t even get us started on PSA’s infamous counterpart, the digital rectal exam. The prostate surface antigen (PSA) test was launched back in 1985 by Hybritech, […]
Two Epigenetic Drugs Join Forces with Cisplatin to Knock Out CancerMarch 9, 2009Just when it seems that scientists are winning the fight against cancer, tumors hit below the belt by developing resistance to chemotherapies. But researchers at the University of Glasgow and TopoTarget Prolifix Ltd. have shown that delivering a 1-2 punch of epigenetic drugs could allow the chemotherapeutic agent cisplatin to knock out resistant tumors. Cisplatin, […]
Nanopore Sequencing the 5th BaseMarch 2, 2009For the pipette-jockeys out there who have been toiling away with tedious bisulfite sequencing runs, MS-PCR, or Me-DIP protocols: Hang in there! It looks like help might soon be on the way. A group of Oxford researchers just published a method that uses nanopore technology to sequence single molecules of DNA, including 5-methylcytosine, all without […]
Integrated Epigenetic Profiling in Primary Human CellsFebruary 25, 2009The Costello Lab at UCSF is another of the four Reference Epigenome Mapping Centers (REMCs, not to be confused with REM although I’m sure Michael Stipe would be very proud of the work going on at the REMCs). According to Dr. Joseph Costello, his lab will be rolling up their sleeves with scientists at UC […]
Oncogenic Viruses MethylomesFebruary 17, 2009To methylate, or not to methylate? That is the question. Whether ’tis nobler in the genome to suffer the onslaughts and diversions of oncogenic DNA viruses or, by inactivating, disguise them (from immune surveillance). When researchers used bisulfite sequencing to examine the methylomes of three double-stranded DNA viruses (Human Papilloma Viruses (HPV) 16 and 18, […]
miRNA-29b at the Bedside?February 16, 2009Start stocking the miRNA-29b in your medicine cabinet. A group of researchers from The Ohio State University recently cranked out some great data demonstrating how miRNAs work to regulate DNA methylation in acute myeloid leukemia (AML), outlining a potential therapeutic use of mir-29b. The study reveals how miR-29b works by targeting DNA Methyltransferases (DNMTs), the […]
DNA Methylation Resuscitation in PlantsFebruary 3, 2009Conventional wisdom had it that once a methylated repeat sequence is heavily demethylated, there’s no turning back. Not only don’t they become remethylated, but subsequent generations inherit the epigenetic changes as well. But a group of European researchers have found that this isn’t always the case and there are at least two distinct classes of […]