Distinct Contributions of Histone H3 Lysine 9 and 27 Methylation to Locus-Specific Stability of Polycomb Complexes  Leonie Ringrose, Heidi Ehret, Renato.

Slides:



Advertisements
Similar presentations
Xiaoshu Chen, Jianzhi Zhang  Cell Systems 
Advertisements

Visualization of trans-Homolog Enhancer-Promoter Interactions at the Abd-B Hox Locus in the Drosophila Embryo  Matthew Ronshaugen, Mike Levine  Developmental.
Cosuppression in Drosophila: Gene Silencing of Alcohol dehydrogenase by white-Adh Transgenes Is Polycomb Dependent  Manika Pal-Bhadra, Utpal Bhadra, James.
Structural Changes in TAF4b-TFIID Correlate with Promoter Selectivity
Hierarchical Recruitment of Polycomb Group Silencing Complexes
Volume 28, Issue 3, Pages (November 2007)
Volume 28, Issue 4, Pages (November 2007)
Daniel Chi-Hong Lin, Alan D Grossman  Cell 
Volume 38, Issue 4, Pages (May 2010)
Volume 107, Issue 6, Pages (December 2001)
Marios Agelopoulos, Daniel J. McKay, Richard S. Mann  Cell Reports 
Volume 19, Issue 23, Pages (December 2009)
Chi-Yun Pai, Elissa P. Lei, Dolanchanpa Ghosh, Victor G. Corces 
Roger B. Deal, Steven Henikoff  Developmental Cell 
Transcription within a Functional Human Centromere
Volume 27, Issue 4, Pages (August 2007)
Volume 11, Issue 4, Pages (April 2003)
Human Senataxin Resolves RNA/DNA Hybrids Formed at Transcriptional Pause Sites to Promote Xrn2-Dependent Termination  Konstantina Skourti-Stathaki, Nicholas J.
Volume 4, Issue 1, Pages (July 1999)
Volume 28, Issue 1, Pages (October 2007)
Volume 57, Issue 2, Pages (January 2015)
Leonie Ringrose, Marc Rehmsmeier, Jean-Maurice Dura, Renato Paro 
Volume 14, Issue 19, Pages (October 2004)
Volume 18, Issue 2, Pages (April 2005)
Volume 2, Issue 2, Pages (February 2008)
Phosphorylation of Serine 2 within the RNA Polymerase II C-Terminal Domain Couples Transcription and 3′ End Processing  Seong Hoon Ahn, Minkyu Kim, Stephen.
Yugong Ho, Felice Elefant, Stephen A. Liebhaber, Nancy E. Cooke 
Daniel F. Tardiff, Scott A. Lacadie, Michael Rosbash  Molecular Cell 
Volume 7, Issue 9, Pages (September 2014)
lin-35 and lin-53, Two Genes that Antagonize a C
SIR2 Is Required for Polycomb Silencing and Is Associated with an E(Z) Histone Methyltransferase Complex  Takehito Furuyama, Rakhee Banerjee, Thomas R.
Slow Chromatin Dynamics Allow Polycomb Target Genes to Filter Fluctuations in Transcription Factor Activity  Scott Berry, Caroline Dean, Martin Howard 
Volume 16, Issue 3, Pages (March 2015)
Volume 13, Issue 1, Pages (July 2013)
Tatiana I Gerasimova, Victor G Corces  Cell 
Antonin Morillon, Nickoletta Karabetsou, Anitha Nair, Jane Mellor 
Laura Lande-Diner, Jianmin Zhang, Howard Cedar  Molecular Cell 
Volume 124, Issue 5, Pages (March 2006)
Volume 132, Issue 6, Pages (March 2008)
ADAR Regulates RNA Editing, Transcript Stability, and Gene Expression
Xudong Wu, Jens Vilstrup Johansen, Kristian Helin  Molecular Cell 
Dimethylation of H3K4 by Set1 Recruits the Set3 Histone Deacetylase Complex to 5′ Transcribed Regions  TaeSoo Kim, Stephen Buratowski  Cell  Volume 137,
Volume 20, Issue 4, Pages (April 2011)
Volume 44, Issue 1, Pages (October 2011)
Drosophila Maelstrom Ensures Proper Germline Stem Cell Lineage Differentiation by Repressing microRNA-7  Jun Wei Pek, Ai Khim Lim, Toshie Kai  Developmental.
Volume 12, Issue 5, Pages (November 2003)
DNA Looping Facilitates Targeting of a Chromatin Remodeling Enzyme
H2B Ubiquitylation Promotes RNA Pol II Processivity via PAF1 and pTEFb
Gene Density, Transcription, and Insulators Contribute to the Partition of the Drosophila Genome into Physical Domains  Chunhui Hou, Li Li, Zhaohui S.
The Prolyl Isomerase Pin1 Functions in Mitotic Chromosome Condensation
Volume 27, Issue 5, Pages (September 2007)
Volume 133, Issue 5, Pages (May 2008)
Volume 10, Issue 5, Pages (November 2002)
A Chromatin Insulator Determines the Nuclear Localization of DNA
Occupying Chromatin: Polycomb Mechanisms for Getting to Genomic Targets, Stopping Transcriptional Traffic, and Staying Put  Jeffrey A. Simon, Robert E.
Jin Mo Park, Janis Werner, Jung Mo Kim, John T Lis, Young-Joon Kim 
Volume 42, Issue 1, Pages (April 2011)
Cosuppression of Nonhomologous Transgenes in Drosophila Involves Mutually Related Endogenous Sequences  Manika Pal-Bhadra, Utpal Bhadra, James A. Birchler 
Volume 150, Issue 5, Pages (August 2012)
Feng Xu, Qiongyi Zhang, Kangling Zhang, Wei Xie, Michael Grunstein 
A Role for Mammalian Sin3 in Permanent Gene Silencing
Volume 41, Issue 2, Pages (January 2011)
Polycomb Silencing Blocks Transcription Initiation
Nucleoporin Nup98 Associates with Trx/MLL and NSL Histone-Modifying Complexes and Regulates Hox Gene Expression  Pau Pascual-Garcia, Jieun Jeong, Maya.
Volume 9, Issue 3, Pages (November 2014)
Xiaoshu Chen, Jianzhi Zhang  Cell Systems 
Hierarchical Recruitment of Polycomb Group Silencing Complexes
Volume 127, Issue 6, Pages (December 2006)
Distinct Contributions of Histone H3 Lysine 9 and 27 Methylation to Locus-Specific Stability of Polycomb Complexes  Leonie Ringrose, Heidi Ehret, Renato.
Mutant TERT promoter displays active histone marks and distinct long-range interactions: A, cell lines that were used in the study with their origin and.
Presentation transcript:

Distinct Contributions of Histone H3 Lysine 9 and 27 Methylation to Locus-Specific Stability of Polycomb Complexes  Leonie Ringrose, Heidi Ehret, Renato Paro  Molecular Cell  Volume 16, Issue 4, Pages 641-653 (November 2004) DOI: 10.1016/j.molcel.2004.10.015

Figure 1 Colocalization of Polycomb and Methylated Histones on Polytene Chromosomes (A–L) Double stainings with anti-PC antibody (red, [B], [F], and [J]) and either anti-H3K27Me2 at 1:2.5 dilution (C), H3K27Me3 at 1:75 dilution (G), or H3K9Me3 at 1:500 dilution (K) (green in all panels). Signals from PC and each methyl histone are merged in (D), (H), and (L). (M–Q) Each antibody was incubated with dot blots carrying peptides at different concentrations as indicated. H31-13 and H3 21-33 are unmethylated. (M), H3K27Me2, 1:50; (N), H3K27Me3, 1:1,500; (O), H3K9Me3, 1:10,000. Blots (N and O) were quantified (P and Q). Peptide bound (y axis) represents fraction of maximum binding. (P) K27Me3 antibody. Solid line, K27Me3 peptide; dotted line, K9Me3 peptide. (Q) K9Me3 antibody. Solid line, K9Me3 peptide; dotted line, K27Me3 peptide. Molecular Cell 2004 16, 641-653DOI: (10.1016/j.molcel.2004.10.015)

Figure 2 Summary of Polycomb and Trithorax Group Binding, Sites of H3K9 and H3K27 Trimethylation, and Gene Expression (A) All sites of PC binding and histone methylation (H3K27Me3 or H3K9Me3) were cytologically mapped using immunostained polytene chromosomes and are shown as colored bars above ideograms for each chromosome. Blue, H3K27Me3; yellow, H3K9Me3; solid red bars, PC; stippled red bars, other published PcG protein binding sites at which no PC signal is detected (PSC, PH, SU(Z)2); green, published binding sites for TRX and ASH1. Cytological map positions are shown below each chromosome arm. Thin vertical lines show predicted PREs from Ringrose et al. (2003). The top two rows of bars above the figure show summary of competition experiment (see Figure 6). Red bars, sites from which PC was not competed; gray bars, sites from which PC was lost upon peptide competition. Top row, H3K27Me3 peptide; second from top, H3K9Me3 peptide. (B) Number of bands mapped for PC (red) H3K9Me3 (yellow) and H3K27Me3 (blue). (C) Real-time PCR analysis of expression levels in salivary glands of genes associated with predicted PREs. The graph shows relative quantities in cDNA prepared from larval salivary glands of 38 transcripts compared to the level of Tubulin cDNA. Mean and standard deviation of three to six experiments are shown for each gene. PCR products after 32 cycles are shown below the graph. Gene names include cytological location for comparison to genome map (A). See also Figure 4 and legend. (D) Comparison of expression level with methylation status. Genes are divided into three classes based on percentage of Tubulin level as shown. For a given class, the proportion of genes with a given methylation status (none, one, or both of K9Me3 and K27Me3) is expressed as a percentage of the total number in that class. Expected distribution was calculated from methylation status of all PC bound sites (A). χ2 values were calculated using absolute numbers. For 2 degrees of freedom, the three methylation classes shown were considered. For 1 degree of freedom, two classes, with and without methylation, were considered. Molecular Cell 2004 16, 641-653DOI: (10.1016/j.molcel.2004.10.015)

Figure 3 H3K9 and K27 Methylation of a Transgene Carrying a PRE and Promoter from the Bithorax Complex (A–D) The endogenous Bithorax complex locus at 89E is shown (white arrowhead). Polytene chromosomes were stained for Pc ([A], red), H3K27Me3 ([B], blue), H3K9Me3 ([C], yellow), or DAPI. (D) H3K9Me3 from (C) is colored red and merged with DAPI. (E–N) The bxd14 transgene carrying the bxd PRE (positions 207,560–222,061 of the BX-C, accession number U31961) fused to the Ubx promoter driving a LacZ reporter gene (N), inserted at 62A on chromosome 3L, was analyzed for Pc binding (E–G), H3K27 methylation (H–J), and H3K9 methylation (K–M). In each case, the 62A region of a control strain lacking the transgene is shown (wt, [E], [H], and [K]) compared to the 85-39 strain that carries the bxd 14 transgene (F, I, and L). Merging with DAPI-stained chromosomes (G, J, and M) indicated an additional band at 62A in all cases (white arrowhead on [F], [G], [I], [J], [L], and [M]). Molecular Cell 2004 16, 641-653DOI: (10.1016/j.molcel.2004.10.015)

Figure 4 Polycomb Binding, Histone Methylation, and Gene Expression at Individual PREs (A–D) Enrichment of PC (A), H3K27Me3 (B), H3K9Me3 (C), and GAGA factor (D) on 1 kb fragments for predicted PREs was determined by chromatin IP from Drosophila Schneider cells. Similar results were obtained in at least three independent experiments for each antibody; the figure shows the mean and standard deviation of three experiments. Neg: mean enrichments for 43 control non-PRE fragments. Inset in each panel shows linear correlation coefficient of each data set with others as indicated, based on means. For the PREs of the BX-C, gene names are shown in italics. (E) Real-time PCR analysis of expression levels in Schneider cells, calculated as indicated in Figure 2 legend. PCR products after 32 cycles are shown below the graph: upper panel, Schneider cells; middle panel, embryos as control for primer function. Lower panel, −RT control (Schneider cells). Numbers below embryo panel indicate primer efficiencies relative to Tubulin, calculated as described in Supplemental Data. (F) RT-PCR products after 32 cycles for each transcript in SL2 cells (top), embryos (middle), and −RT controls (bottom). Molecular Cell 2004 16, 641-653DOI: (10.1016/j.molcel.2004.10.015)

Figure 5 Mapping of Polycomb Binding and Histone Methylation across a Section of the Bithorax Complex Enrichments of PC (A), H3K27Me3 (B), and H3K9Me3 (C) on the BX-C in SL2 cells determined by ChIP. The figure shows the mean and standard deviations of three independent experiments. Hybridizations of immunoprecipitated material to genomic DNA controls were used to set equivalent vertical scales in (A)–(C). The four sections of the BX-C analyzed are shown schematically above the figure. Slanted double lines indicate discontinuities in the sequences analyzed. Coordinates from U31961: iab-4, 118,576–146,018; iab-3-abdA, 150,921–153,965; bxd, 209,717–229,344; Ubx, 240,095–243,057. Gray boxes indicate published PREs or promoters. Solid black box: minimal 1.6 kb bxd PRE. The transcription start sites of the abdA and Ubx genes are indicated by arrows. Molecular Cell 2004 16, 641-653DOI: (10.1016/j.molcel.2004.10.015)

Figure 6 H3K27 and H3K9 Methylated Peptides Compete for Polycomb Binding (A–J) Salivary glands were dissected from third instar larvae, permeabilized, and incubated for 6 min in a 0.5 mM solution of each of the histone H3 peptides indicated in (J). Glands were then fixed, squashed, and double stained with anti-PC (red, [C], [F], and [I]) and with anti-Modulo (green, [B], [E], and [H]). DAPI staining is also shown (A, D, and G). For each peptide, between 25 and 61 chromosome spreads were identified that showed robust Modulo staining throughout the arms, and, of these, the percentage was calculated that showed partial loss of PC staining (J). Sites of PC loss upon H3K9Me3 or H3K27Me3 competition were cytologically mapped and are shown in Figure 2. (K) Comparison of competition with methylation status. Loci are divided into three classes based on response to competition with H3K9Me3 and H3K27Me3 peptides as indicated. For a given class, the proportion of genes with a given methylation status is expressed as a percentage of the total number in that class. Expected distribution was calculated from methylation status of all PC bound sites (Figure 2). χ2 values were calculated using absolute numbers. For 2 degrees of freedom, the three methylation classes shown were considered. For 1 degree of freedom, two classes, with and without methylation, were considered. (L) Comparison of competition with expression level, axes as for (K). Molecular Cell 2004 16, 641-653DOI: (10.1016/j.molcel.2004.10.015)

Figure 7 Mathematical Modeling of Peptide Competition (A) For input to mathematical models, the concentration of PC in salivary glands and Schneider (SL2) cells was measured by comparing known quantities of the purified antigen used to generate PC antibody, with known numbers of cells of each type on Western blots probed with PC antibody. 20 salivary glands are estimated to contain 2000 cells. Both lower and upper Pc bands seen in cells and salivary glands are specific: the lower band corresponds to the expected molecular weight of monomeric PC; the upper band appears to be a modified form. Quantification of blots from three independent salivary gland and cell preparations yielded 8.7 (± 3.2) × 10−4 ng PC per cell in salivary glands (= 1.45 [±0.53] × 107 molecules per cell) and 4.7 (±2.1) × 10−5 ng PC per cell in SL2 cells (= 7.8 [± 4.6] × 105 molecules per cell). (B and C) Schematic model for PC binding to methylated PREs. Gray circles, PC; yellow triangles, H3 tails trimethylated at K9; blue circles, H3 tails trimethylated at K27; red circles, other proteins bound directly to PRE, e.g., GAGA, Zeste, PHO. Forward (kn) and backward (k − n) rate constants for each interaction are shown. Black arrows, constants derived from measured binding data (see main text and Supplemental Data); red arrows, unknown constants for which different values are explored in (D)–(I). (C) Higher order complexes between PC bound to chromatin via K27 methylated tails, or PRE bound proteins. (D–I) Simulations of binding and peptide competition using the model shown in (B) and (C). Vertical scale shows the absolute number of PC molecules that are bound to the PRE, ×103; thus, approximately 10,000 molecules are bound at equilibrium in (D). At 5 min (red arrow), the effects of addition of 0.5 mM of either K9Me3 (dashed line) or K27Me3 peptide (solid line) were examined. Molecular Cell 2004 16, 641-653DOI: (10.1016/j.molcel.2004.10.015)