WhatIsEpigenetics, Author at What is Epigenetics?

Accurately Telling the Age of Human Tissues and Cells by DNA Methylation Clock

November 11, 2013 WhatIsEpigenetics

External signs of the human body’s age can be given by wrinkles and graying hair. However, these signs may not be accurate to tell the age of human tissues and cells that construct your body. Geneticist and biomathematician Steve Horvath at the University of California Los Angeles has developed a multi-tissue predictor of age that enables one to estimate the age of most tissues and cell types based on DNA methylation that can selectively switch off genes. This age predictor was [more…]

dna methylation blood epigenetics pancreatic cancer test

Simple Blood Test of DNA Methylation Markers Promises Early Diagnosis of Pancreatic Cancer

November 1, 2013 WhatIsEpigenetics

The scientists at Johns Hopkins University used a genome-wide pharmacologic transcriptome approach to identify two novel cancer-specific DNA methylation markers in cultured pancreatic cancer cells: BNC1 and ADAMTS1. Using a nanoparticle-enabled MOB (Methylation On Beads) technology, they found that these two markers are also frequently detected in serum samples of pancreatic cancer patients (N = 42) with a sensitivity for BNC1 of 79% and for ADAMTS1 of 48%, while the specificity was 89% for BNC1 and 92% for ADAMTS1. Overall [more…]

messenger RNA mRNA methylation epigenetic new technique Epigentek

New Technique Available to Measure m6A Levels for RNA Methylation Studies

October 22, 2013 WhatIsEpigenetics

Researchers at Epigentek recently developed a new and breakthrough approach to identify the “fifth base” of RNA, N6-methyladenosine (m6A) to efficiently study RNA methylation in a practical and cost-effective manner. The technology is based on a high throughput and strip-well microplate format and is made commercially available as the EpiQuik m6A RNA Methylation Quantification Kit, the first of its kind. It was commonly believed that messenger RNA (mRNA) contains four nucleobases — guanine, adenine, uracil, and cytosine. However in 2012, [more…]

TALE-TET1 demethylation of specific CpGs

Targeted DNA demethylation and activation of endogenous genes using programmable TALE-TET1 fusion proteins

October 16, 2013 WhatIsEpigenetics

The scientists at MIT describe an approach for efficient targeted demethylation of specific CpGs in human cells using fusions of engineered transcription activator–like effector (TALE) repeat arrays and the TET1 hydroxylase catalytic domain. Using these TALE-TET1 fusions, they demonstrated that modification of critical methylated promoter CpG positions can lead to substantial increases in the expression of endogenous human genes. Genome-wide studies have defined cell type–specific patterns of DNA methylation that are important for regulating gene expression in both normal development2 [more…]

micro rna TET DNA Demethylation enzyme epigenetics

A New Study Shows MicroRNA-26a Targets DNA Demethylation Enzymes

October 16, 2013 WhatIsEpigenetics

In their studies, the scientists at Beckman Research Institute of City of Hope demonstrated that Ten eleven translocation (TET) enzymes and thymine DNA glycosylase (TDG) can be direct targets of the microRNA miR-26a. These DNA demethylation enzymes are down-regulated in islets during postnatal differentiation, whereas miR-26a is up-regulated. They also report that changes in 5-hydroxymethylcytosine accompany changes in TET mRNA levels and over expression of miR-26a in mice increases postnatal islet cell number in vivo and endocrine/acinar colonies in vitro. [more…]

“Post-Bisulfite” and Higher Sensitivity DNA Library Preparation Technology for Epigenetics-Targeted Next Generation Sequencing Analysis

October 4, 2013 WhatIsEpigenetics

Scientists at Epigentek developed a series of new products for DNA library preparation used in next generation sequencing analysis of epigenetic mechanisms including genome-wide DNA methylation and DNA-protein interaction. Next-gen sequencing requires an initial preparation of a DNA library, but often necessitates a high amount of starting materials to achieve. This makes tumor biopsy and embryonic tissue samples especially challenging to sequence for epigenetic applications. Current commercial offerings from other companies are also rather expensive as well as laborious. These [more…]

Novel Assay to Probe the DNA Methylation State of Multiple Genomic Loci in Single Cells

October 1, 2013 WhatIsEpigenetics

The scientists from A*STAR’s Institute of Medical Biology (IMB) and Institute of Molecular and Cell Biology (IMCB) developed a novel methodology to probe single cells for various DNA-methylation errors at multiple loci to reveal failed maintenance of epigenetic mark results in chimeric mice, which display unpredictable phenotypes leading to developmental arrest. This methodology allows the use of a special technique utilizing a microfluidic device to safely extract one cell for performing the assay called “pronuclear transfer” to ameliorate reprogramming defects in embryos. This study not [more…]

natural killer cells manipulated epigenetics histones

New Study Shows Epigenetic Process Controls Cancer-Killing Cells

October 1, 2013 WhatIsEpigenetics

A new study from the scientists at the University of Southern California (USC) describes for the first time how natural killer (NK) cells, which are able to kill and contain viruses and cancerous tumors in the human body, can be manipulated by epigenetics. Through a series of experiments in mice, these scientists found that MYSM1, an enzyme in the body’s immune system that turns genes on and off by modifying proteins called histones embedded in DNA, is required for natural [more…]

DNA methylation individual cell nuclei and chromosomes epigenetics

Sequence-specific microscopic visualization of DNA methylation status at satellite repeats in individual cell nuclei and chromosomes

September 13, 2013 WhatIsEpigenetics

Scientists from Japan developed methylation-specific fluorescence in situ hybridization (MeFISH) for microscopic visualization of DNA methylation status at specific repeat sequences in individual cells. MeFISH is based on the differential reactivity of 5-methylcytosine and cytosine in target DNA for interstrand complex formation with osmium and bipyridine-containing nucleic acids (ICON). Cell nuclei and chromosomes hybridized with fluorescence-labeled ICON probes for mouse major and minor satellite repeats were treated with osmium for crosslinking. After denaturation, fluorescent signals were retained specifically at satellite [more…]

epigenetic in vivo inhibition or silencing of microRNA

Targeting Noncoding RNAs in Disease: Challenges and Opportunities

September 13, 2013 WhatIsEpigenetics

Noncoding RNAs make up the majority of transcribed RNA and have a wide range of functions in cellular and developmental processes. Consequently, they are also implicated in the development and pathophysiology of many diseases and represent potential targets for therapeutic intervention. Scientists found that effective in vivo inhibition (or silencing) of microRNA, one class of noncoding RNA, has enabled to make groundbreaking discoveries about the contribution of these short regulating RNAs to some of the major human diseases, such as [more…]

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Articles by WhatIsEpigenetics

Accurately Telling the Age of Human Tissues and Cells by DNA Methylation Clock

Simple Blood Test of DNA Methylation Markers Promises Early Diagnosis of Pancreatic Cancer

New Technique Available to Measure m6A Levels for RNA Methylation Studies

Targeted DNA demethylation and activation of endogenous genes using programmable TALE-TET1 fusion proteins

A New Study Shows MicroRNA-26a Targets DNA Demethylation Enzymes

“Post-Bisulfite” and Higher Sensitivity DNA Library Preparation Technology for Epigenetics-Targeted Next Generation Sequencing Analysis

Novel Assay to Probe the DNA Methylation State of Multiple Genomic Loci in Single Cells

New Study Shows Epigenetic Process Controls Cancer-Killing Cells

Sequence-specific microscopic visualization of DNA methylation status at satellite repeats in individual cell nuclei and chromosomes

Targeting Noncoding RNAs in Disease: Challenges and Opportunities

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