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CpG Islands: Areas of increased density of the dinucleotide sequence cytosine--phosphate diester--guanine. They form stretches of DNA several hundred to several thousand base pairs long. In humans there are about 45,000 CpG islands, mostly found at the 5' ends of genes. They are unmethylated except for those on the inactive X chromosome and some associated with imprinted genes.
 JoVE Biology

Enhanced Reduced Representation Bisulfite Sequencing for Assessment of DNA Methylation at Base Pair Resolution

1Department of Medicine, Weill Cornell Medical College, 2Institute for Computational Biomedicine, Weill Cornell Medical College, 3Department of Physiology and Biophysics, Weill Cornell Medical College, 4Department of Pathology, University of Michigan


JoVE 52246

 JoVE Biology

Preparation of Formalin-fixed Paraffin-embedded Tissue Cores for both RNA and DNA Extraction

1Department of Pathology & Molecular Medicine, Queen's University, 2Division of Cancer Biology & Genetics, Queen's Cancer Research Institute, Queen's University, 3Department of Surgery, Division of Urology, McGill University, 4Transformative Pathology Program, Ontario Institute for Cancer Research (OICR)


JoVE 54299

 Science Education: Essentials of Genetics

DNA Methylation Analysis

JoVE Science Education

Methylation at CpG dinucleotides is a chemical modification of DNA hypothesized to play important roles in regulating gene expression. In particular, the methylation of clusters of methylation sites, called “CpG islands”, near promoters and other gene regulatory elements may contribute to the stable silencing of genes, for example, during epigenetic processes such as genomic imprinting and X-chromosome inactivation. At the same time, aberrant CpG methylation has been shown to be associated with cancer.In this video, the biological functions and mechanisms of DNA methylation will be presented, along with various techniques used to identify methylation sites in the genome. We will then examine the steps of bisulfite analysis, one of the most commonly used methods for detecting DNA methylation, as well as several applications of this technique.

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 JoVE Neuroscience

Design, Surface Treatment, Cellular Plating, and Culturing of Modular Neuronal Networks Composed of Functionally Inter-connected Circuits

1Department of Neurobiology, George S. Wise Faculty of Life Sciences, Tel-Aviv University, 2Department of Neuroscience and Brain Technologies, Istituto Italiano di Tecnologia, 3School of Electrical Engineering, Tel-Aviv University, 4School of Physics and Astronomy, Tel-Aviv University, 5Department of Informatics, Bioengineering, Robotics and System Engineering, University of Genova


JoVE 52572

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 JoVE Immunology and Infection

High-throughput Quantitative Real-time RT-PCR Assay for Determining Expression Profiles of Types I and III Interferon Subtypes

1Center for Biologics Evaluation and Research, US Food and Drug Administration, 2Center for Drug Evaluation and Research, US Food and Drug Administration


JoVE 52650

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 JoVE Chemistry

Preparation of Mica and Silicon Substrates for DNA Origami Analysis and Experimentation

1Department of Chemistry and Biochemistry, University of Notre Dame, 2Department of Chemical and Biomolecular Engineering, University of Notre Dame, 3Department of Chemistry, Physics, and Engineering Studies, Chicago State University, 4Department of Technology, Ivy Tech Community College, South Bend, Indiana


JoVE 52972

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 JoVE Biology

Methylated DNA Immunoprecipitation

1Department of Cancer Genetics and Developmental Biology, BC Cancer Research Centre, 2Interdisciplinary Oncology Program, University of British Columbia - UBC, 3These authors contributed equally., 4Department of Pathology and Laboratory Medicine, University of British Columbia - UBC, 5Photography/Video Production, Multi-Media Services, BC Cancer Agency, 6Department of Medical Genetics, Life Sciences Institute,, University of British Columbia - UBC


JoVE 935

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 JoVE Developmental Biology

Understanding Early Organogenesis Using a Simplified In Situ Hybridization Protocol in Xenopus

1Developmental and Stem Cell Biology, Hospital for Sick Children, 2Children's Health Research Institute, University of Western Ontario, 3Department of Physiology and Pharmacology, University of Western Ontario, 4Neurosciences and Mental Health, Hospital for Sick Children, 5Department of Paediatrics, University of Western Ontario


JoVE 51526

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 JoVE Bioengineering

From Voxels to Knowledge: A Practical Guide to the Segmentation of Complex Electron Microscopy 3D-Data

1Life Sciences Division, Lawrence Berkeley National Laboratory, 2Joint Bioenergy Institute, Physical Biosciences Division, Lawrence Berkeley National Laboratory, 3National Energy Research Scientific Computing Center, Lawrence Berkeley National Laboratory


JoVE 51673

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