FOLLICULAR LYMPHOMA- ILLUMINA METHYLATION. Jude Fitzgibbon
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1 FOLLICULAR LYMPHOMA- ILLUMINA METHYLATION Jude Fitzgibbon
2 Molecular Predictors of Clinical outcome Responders Alive Non-responders Dead TUMOUR GENETICS Targeted therapy, Prognostic markers, Minimal Residual Disease
3 t(14;18) CN changes UPD Mutation Methylation
4 Features of Follicular Lymphoma GC B-cell disease t(14;18) >> IgH-Bcl new cases in UK 10 yr median survival Relapse-remitting Rituximab Transformation: 1-2yr survival Epigenetics FL FL1 FL2 FL N = Years
5 Epigenetic Modifications DNA Methylation Histone Modifications Regulation of gene expression
6 Published Literature in FL - Individual Genes
7 Array-based Methylation Analysis (Illumina ) GoldenGate Infinium HumanMethylation27- BeadChip New Platform >400, C 220
8 Infinium HumanMethylation27 BeadChip Quantitative methylation measurement at the single-cpg level CpG loci genes 1000 cancer related genes 200 microrna promoters 12 sample BeadArray format
9 Infinium HumanMethylation27 BeadChip Courtesy of Dr Andrew Teschendorff- UCL
10 Infinium HumanMethylation27 BeadChip The workflow... Bisulfate conversion Whole genome amplification Enzymatic fragmentation Hybridization Scanning
11 Infinium HumanMethylation27 BeadChip Background Bisulfate modification: - unmethylated C converted to U - methylated C protected from conversion Site specific probes - U & M bead type (unmethylated and methylated) - hybridization followed by a single base extension Continuous measurement: β value: 0-1
12 Aim of the Project Determine extent and frequency of methylation in FL Correlate with gene expression Correlate with clinical data Follow anything exciting
13 Methylation Profiling Samples Sample n Mean Age, (Range) Malignant Lymph Node DNA 184 Previously untreated Follicular Lymphoma (FL) (23-90) Paired FL and transformed FL: Pre-transformation FL 10 Transformed FL 10 Benign Lymph Node DNA* (4-55) Hyperplastic 14 Granulomatous 3 PTGC 3 Dermatopathic lymphadenitis 2 Granulation Tissue 1 Tonsils / Adenoids 4 13 (7-27) Hyperplastic 4
14 Methylation Profiling Cluster analyisis CpG Loci Cluster analysis FL (n=164) Non-tumour (n=27) Robust discriminator between malignant vs benign samples O Riain et al, Leukemia 2009
15 Methylation Profiling Cluster analyisis Low Change High Change No difference in age, grade, stage, clinical outcome between extremes!
16 Microenvironment samples FL cells genes Immune cells (infiltrating) Dave et al NEJM 2004
17 Methylation Profiling Cluster analysis Low Change High Change Heterogeneity due to variable proportion of B cells CELL SORTING: CD3+ T cells CD19+ B cells
18 The Role of Polycomb Repressor Complex : enrichment for PRC2 target genes among hypermethylated gene sets in carcinoma
19 Hypermethylated genes -PRC2 targets in ES cells.
20 The PRC2 complex and Histone methylation UTX EZH2 EED SUZ12 PRC2 Complex DNMT Direct interaction with DNA methyltransferases Trimethylated H3K27 Repressive chromatin mark
21 Link PRC2 and Hypermethylation loci in FL EED EZH2 SUZ12 DNMTs EED EZH2 SUZ12
22 Histone Methyl marks (K4, K27) Gene expression stopped Histone tails Histones H3K27Me3
23 EZH2 Y641 mutated in FL (Vancouver Morin 10) 225 FL : 26 mutations (11%)...Barts series 20 FL tfl pairs: 30% Y641F (14), Y641N (8), Y641H (3), Y641S (1) Y641F EZH2 mutated _ H3K27Me3 expression Y641S S Y641H +
24 EZH2 Y641 mutated in FL (Vancouver Morin 10) 225 FL : 26 mutations (11%)...Barts series 20 FL tfl pairs: 30% Y641F (14), Y641N (8), Y641H (3), Y641S (1) Y641F EZH2 mutated _ H3K27Me3 expression Y641S S Y641H + Mechanisms other than mutation ->30%
25 EZH2 Y641 not linked with outcome Overall survival 0.50 EZH2 +ve n= chi2(1) = 1.80 Pr>chi2 = EZH2 ve n= analysis time
26 Histone Methyl marks (K4, K27) Gene expression stopped Histone tails Histones H3K27Me3
27 Histone Methyl marks (K4, K27) Gene expression ON Histone tails Histones H3K4Me3
28 Histone Methyl marks (K4, K27) State of readiness Lose marks as required for differentiation Histone tails Histones H3K27Me3 H3K4Me3
29 Enrichment for genes with bivalent domains in ES cells p< Genome-wide (n=18216) Infinium Array (n=9037) Hypermethylated gene set (n=689) Based on mapping by :Ku et al., PLoS Genetics 2008
30 Data on frequency of Histone modifications. Hypermethylated Infinium Array Genome Wide n= % n= % n= % No Marks K K K4 and K TOTAL
31 Gene Ontology (GO) in hypermethylated gene set. GO term Hypermethylated genes Infinium array set Adjusted P value (%) (%) Multicellular organismal development x10-25 Anatomical structure development x10-21 System development x10-19 Nervous system development x10-14 Cell-cell signalling x10-14 Organ development x10-11
32 DNA Methylation vs Histone Methylation DNMT? EZH2 EED SUZ12 PRC2 Complex Azacytidine Both can be pharmacologically manipulated! DZNep
33 Summary Aberrant hypermethylation in >700 genes in FL Early pre-programmed methylation of large number of development-related genes Occurs in approximately 8% of CpG islands Genes marked by bivalent domains in ES cells Wide variability in immunohistochemical H3K27Me3 expression in FL Frequent mutation of histone methylase EZH2 in FL
34 Current Plans To test methylation profile as an outcome predictor (choosing high tumour burden biopsies 600 cases). Determine the effects of EZH2 Y641 mutation on clinical outcome. To correlate EZH2/H3K27me3 promoter occupancy with DNA methylation in order to identify methylation dependent and independent PRC2 target genes Determine the effects of EZH2/H3K27m3 and DNA methylation inhibition on primary and FL cell lines. Other mechanisms regulating H3K27me3
35 Acknowledgements Centre for Medical Oncology Ciaran O Riain Csaba Bodor T Andrew Lister Genome Centre, Queen Mary University of London Charles Mein
36 Acknowledgements
Follicular Lymphoma It s not just the t(14;18) anymore. UK Cytogenetics, Newcastle. Jude Fitzgibbon
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