PPT-Epigenetics : Histone Modification II

trithorax Group trxG Maintain the on state of developmental regulatory genes trx founding member HMT on H3K4 Transcriptional memory by trxG and PcG trxG on state memory. Kevin Ferriter. Mariah Minder. From Yesterday…. Do you think your brain cell and your blood cell have the same DNA sequence?. Genetics. Every cell contains all of your DNA. Not every cell expresses all of your DNA. Y. Lyse & Sonicate. IP. Reverse crosslinks. Total. Reverse crosslinks. Amplify. Amplify. Sequence. Sequence. Immuno. -precipitation. Other controls for IP. (e.g., no antibody, non-specific antibody). of epigenetics. A. dult. . stem cells know their . fate. !. For example: m. yoblasts. . can . form . muscle . cells. only.. Hematopoetic. . cells only become blood . cells. .. .....b. ut. . all . Joo. ’ Kim. Louisiana State University. What is . Epigenetics. ?. “the study of mitotically and/or . meiotically. heritable changes in gene function that can not be explained . by changes . in DNA sequences” – (Riggs et al. 1996). Waddington, 1942. “The study of any potentially stable, and ideally, heritable change in gene expression or cellular phenotype that occurs without changes in Watson-Crick base-pairing of . DNA” . Waddington, 1942. “The study of any potentially stable, and ideally, heritable change in gene expression or cellular phenotype that occurs without changes in Watson-Crick base-pairing of . DNA” . 1. Bioinformatics III. X-ray structure of the nucleosome core particle consisting of core histones, and DNA. Top view.. www.wikipedia.org. Side view shows two windings of DNA and two histone layers. The DNA of eukaryotic organisms is packaged into chromatin, whose basic repeating unit is the . Epigenetics comprises (hereditary) changes in gene expression without altering the DNA sequence . Epigenetics is a biological subdiscipline that deals with questions of development, heredity, gene regulation and evolution . Nucleosome. A packaging unit for DNA (=H3/H4 tetramer + two sets of H2A/H2B . dimer. ). DNA (- charge) and . histones. (+ charge) . histones. = tails and globular domains. Higher-Order Packaging of Chromatins. quantitation. . -. For most K residues our histone assay, we monitor the possible occurrence of difference modifications (. m. e1. , . m. e2. , . m. e3. ,. Ac. ) and . unmodified. peptide. . -Different forms of the same peptide, apart of their mass differences, can have different retention times (Important for . Thimo Rohlf 1,4 , Lydia Steiner 1,2 , Jens Przybilla 1 , Sonja Prohaska 2 , Hans Binder 1,3 and Jörg Galle 1 * 1 Interdisciplinary Centre for Bioinformatics of Leipzig University, D-04107 Leipzig, Tiffanie Lee. Quantitative Biology. Dr. Brian . Strahl. , Department of Biochemistry and Biophysics. How does ASH1L read chromatin? What histone reader domains are involved in binding?. ASH1L and MLL cooperate to maintain hematopoiesis and transcription in immune cells in the blood. 1. Bioinformatics III. X-ray structure of the nucleosome core particle consisting of core histones, and DNA. Top view.. www.wikipedia.org. Side view shows two windings of DNA and two histone layers. The DNA of eukaryotic organisms is packaged into chromatin, whose basic repeating unit is the . ‘Epi’: On top of. . Definition:. The . study of changes in organisms caused by modification of gene expression rather than alteration of the genetic code itself.. DNA. How many cell types are in the human body?.