Chromatin Immunoprecipitation
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CHROMATIN IMMUNOPRECIPITATION Diagenode provides complete solutions for ChIP, facilitating workflows and ensuring consistent results in every experiment PAGE 2 DIAGENODE CHROMATIN IMMUNOPRECIPITATION Complete solution for your ChIP Whether you are experienced or new to the field of chromatin immunoprecipitation, Diagenode has everything you need to make ChIP easy and convenient while ensuring consistent data between samples and experiments. As an expert in the field of epigenetics, Diagenode is committed to providing complete solutions from chromatin shearing reagents, shearing instruments such as the Bioruptor® (the gold standard for chromatin shearing), ChIP kits, the largest number of validated and trusted antibodies on the market, and the SX-8G IP-Star® Compact Automated System to achieve unparalleled productivity and reproducibility. INDUSTRY-LEADING CHIP KITS Diagenode offers a broad portfolio of extensively validated, high-quality ChIP kits. Choose the one that fits with your specific experimental needs (page 8). CHIP-SEQ AND CHIP-GRADE ANTIBODIES Diagenode focuses exclusively on epigenetics, providing the largest selection of industry-leading validated antibodies with dedicated technical expertise and support. Our antibodies are the only ones on the market validated in-house for ChIP-seq. Additonally, Diagenode offers premium antibodies which have reached the highest level of validation from extensive in-house validation in combination with numerous collaborations with the EU community of epigenetic experts (page 22). BIORUPTOR® SONICATION DEVICE The Bioruptor is now the industry’s standard and most cited tool for DNA shearing, chromatin shearing and cell lysis*, and is validated for Next-Generation Sequencing library preparation, ChIP, and DNA methylation studies (page 30). AUTOMATED SOLUTIONS The SX-8G IP-Star® Compact Automated System is a simple yet robust automated bench-top instrument that standardizes different epigenetic applications (e.g. ChIP), delivers consistent data and increases your lab’s productivity (page 34). * See list of selected publications on page 31 Innovating Epigenetic Solutions PAGE 3 About Epigenetics Table of contents In 2003, U.S. National Human Genome Research Institute About Epigenetics (NHGRI) director Francis Collins declared, “The HGP has Epigenetic Modifications of Histones . 4 been an amazing adventure into ourselves, to understand our own DNA instruction book, the shared inheritance of all What is ChIP? . 6 humankind.” Raw sequences of an estimated 30,000 genes Diagenode’s ChIP-seq workflow . 7 coding for various cellular functions were identified. STEP 1: Chromatin Shearing Optimization Since that time, much of the focus in human molecular Chromatin Shearing Optimization kits . 8 biology has been on the study of gene regulation in response to intra- and extra-cellular stimuli. This led to one of the STEP 2: Sonication challenges in modern biology: understanding the processes Overview . 9 and mechanisms that allow a single cell to become a ® complete organism composed of hundreds of individual cell Bioruptor Gold standard for chromatin shearing . 10 types, all of which still contain the same DNA. Researchers Efficient chromatin shearing with the Bioruptor® Plus . 11 soon discovered that chromatin could be likened to an The shearing device of choice . 12 “instruction book” which needs to be opened first so that Bioruptor® Models . 13 the words (i.e. the genes), can be read and interpreted. The epigenetic regulation of gene expression refers to STEP 3: Immunoprecipitation this phenomenon. The term epigenetics defines what is Antibodies . 14 happening on the chromatin, the physical support of genes. Manual ChIP kits . 32 Epigenetics is also defined as the study of heritable changes Automated ChIP kits . 37 in phenotype that are independent of changes in the DNA Automation . 40 sequence. “Epigenetic landscape” was a definition introduced by Conrad H. Waddington in the first part of the 20th century STEP 4: DNA Purification as “... the interactions of genes with their environment which IPure kit . 44 bring the phenotype into being” to describe the phenomena connecting genotype to phenotype and describing the STEP 5: Library Preparation process of differentiation. MicroPlex Library Preparation kit . 45 iDeal Library Preparation kit . 46 About Diagenode . 47 Diagenode Headquarters . Back Cover © 2016 Diagenode SA and Diagenode Inc. All rights reserved. No part of this publication may be reproduced, transmitted, transcribed, stored in retrieval systems, or translated into any language or computer language, in any form or by any means: electronic, mechanical, magnetic, optical, chemical, manual, or otherwise, without prior written permission from Diagenode SA (hereinafter, “Diagenode”) . The information in this guide is subject to change without notice. Diagenode and/or its affiliates reserve the right to change products and services at any time to incorporate the latest technological developments. Although this guide has been prepared with every precaution to ensure accuracy, Diagenode and/or its affiliates assume no liability for any errors or omissions, nor for any damages resulting from the application or use of this information. Diagenode welcomes customer input on corrections and suggestions for improvement. The trademarks mentioned herein are the property of Diagenode or their respective owners. Bioruptor® and IP-Star® are registered trademarks of Diagenode SA. Illumina is a registered trademark of Illumina Inc. Ion Torrent and Personal Genome Machine are trademarks of Life Technologies Corporation. www.diagenode.com | PAGE 4 DIAGENODE CHROMATIN IMMUNOPRECIPITATION In 1942, Waddington stated “... it is possible that an adaptive Three major levels of epigenetic changes are described response can be fixed without waiting for the occurrence today: of a mutation...” explaining the plasticity of epigenetic processes, and thereby framing their potential heritability, Chemical modifications at the level of the or long-term stability. nucleotides, which include DNA methylation and RNA interference Epigenetic machinery gives an organism with the molecular Modifications at the level of histones that include resources a quick response to environmental conditions post-translational change of histone proteins and with a steady modification in gene expression. the incorporation of histone variants Visual representation of the epigenetic landscape. ATP-dependent processes that regulate the access to nucleosomal DNA (nucleosome remodelling) Epigenetic mechanisms are made of a highly complex and interlacing network, incorporating all three levels of possible epigenetic modifications. These mechanisms include multiple positive and negative feed forward and feedback pathways that span both the DNA and the histone level and the higher order of chromatin structure. A number of epigenetic modifications are found at both of these levels due to mechanisms which still remain poorly understood. Epigenetic Modifications of Histones Post-translational histone modifications affinity between the histone tail and the negatively charged DNA. Histones can become acetylated on lysine (K) (PTMs) residues. Histone acetylation are regulated by the histone acetyltransferases (HATs) and two functional categories of Due to their chemical properties, PTMs modify the histone deacetylases (HDACs): 1) eleven zinc-dependent condensation of chromatin and therefore the accessibility HDACs (class I, IIa, IIb, and IV HDACs) and 2) the sirtuins of DNA to transcriptional machinery. The majority of histone (seven class III NAD -dependent HDACs). Functional impact PTMs arises on the NH2-terminal tail, although on the of some acetylateable residues is more substantial than COOH-terminal tail of the core histones. PTMs consist of others. For example, in yeast (S. cerevisae), H4K16 regulates acetylation, methylation, phosphorylation, ubiquitination, its own subset of genes, while other genes are co-regulated and sumoylation. PTMs can occur on all histones. by all of H4K12, K8, and K5, but not by K16. Histones are basic proteins that regulate the compaction of the chromatin. Histones consist of a globular histone 2. Methylation core and a NH2-terminal histone tail, protruding out of the rigid histone-DNA assemblage, called the nucleosome. This epigenetic modification has been shown to associate A nucleosome, the 10 nm thick primary structure of the with both transcribed and silenced genes. Histones can be chromatin is made of an octamer of the four core histones methylated on both lysine and arginine (R) residues. Lysine H2A, H2B, H3, and H4 in duplicates, around which 147 residues can be mono-, di-, and trimethylated and arginine base pairs of DNA are wrapped. Nucleosomes are bonded residues can be mono- and dimethylated. Effector proteins, together by the linker histone H1, which is not part of the such as transcriptional co-activators, recognize mono-, di-, nucleosome as such. and trimethylated epitopes with different affinities. Thus it is most likely that the various degrees of histone methylation influence gene expression regulation (e.g. trimethylated 1. Acetylation H3K4 is exclusively associated with expressed genes Histone acetylation has been correlated to transcriptional whereas monomethylated H3K4 has been associated with activation. Acetyl group addition neutralizes the positive both expressed and repressed genes). charge of the -amino group of the lysine, which decreases Innovating Epigenetic Solutions PAGE 5 4. Ubiquitination