2011 10 26_quantitative_cell_biology_molecular_profiling_v_twitter
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Transcript of 2011 10 26_quantitative_cell_biology_molecular_profiling_v_twitter
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Next Generation Molecular Profiling
26 oktober 2011Auditorium J, Plateau, Gent
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Lab for Bioinformatics and computational genomics
10 “genome hackers” mostly engineers (statistics)
42 scientiststechnicians, geneticists, clinicians
>100 people hardware engineers,
mathematicians, molecular biologists
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Overview
Personalized Medicine,
Biomarkers …
… Molecular Profiling
First Generation Molecular Profiling
Next Generation Molecular Profiling
Next Generation Epigenetic Profiling
Concluding Remarks
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Personalized Medicine
• The use of diagnostic tests (aka biomarkers) to identify in advance which patients are likely to respond well to a therapy
• The benefits of this approach are to– avoid adverse drug reactions– improve efficacy– adjust the dose to suit the patient– differentiate a product in a competitive market– meet future legal or regulatory requirements
• Potential uses of biomarkers– Risk assessment– Initial/early detection– Prognosis– Prediction/therapy selection– Response assessment– Monitoring for recurrence
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Biomarker
First used in 1971 … An objective and « predictive » measure … at the molecular level … of normal and pathogenic processes and responses to therapeutic interventions
Characteristic that is objectively measured and evaluated as an indicator of normal biologic or pathogenic processes or pharmacologic response to a drug
A biomarker is valid if:– It can be measured in a test system with well
established performance characteristics – Evidence for its clinical significance has been
established
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Rationale 1:Why now ? Regulatory path becoming more clear
There is more at stake than efficient drug development. FDA « critical path initiative » Pharmacogenomics guideline
Biomarkers are the foundation of « evidence based medicine » - who should be treated, how and with what.
Without Biomarkers advances in targeted therapy will be limited and treatment remain largely emperical. It is imperative that Biomarker development be accelarated along with therapeutics
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Why now ?
First and maturing second generation molecular profiling methodologies allow to stratify clinical trial participants to include those most likely to benefit from the drug candidate—and exclude those who likely will not—pharmacogenomics-based
Clinical trials should attain more specific results with smaller numbers of patients. Smaller numbers mean fewer costs (factor 2-10)
An additional benefit for trial participants and internal review boards (IRBs) is that stratification, given the correct biomarker, may reduce or eliminate adverse events.
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Molecular Profiling
The study of specific patterns (fingerprints) of proteins, DNA, and/or mRNA and how these patterns correlate with an individual's physical characteristics or symptoms of disease.
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Generic Health advice
• Exercise (Hypertrophic Cardiomyopathy)• Drink your milk (MCM6 Lactose intolarance)• Eat your green beans (glucose-6-phosphate
dehydrogenase Deficiency)• & your grains (HLA-DQ2 – Celiac disease)• & your iron (HFE - Hemochromatosis)• Get more rest (HLA-DR2 - Narcolepsy)
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Generic Health advice (UNLESS)
• Exercise (Hypertrophic Cardiomyopathy)• Drink your milk (MCM6 Lactose intolarance)• Eat your green beans (glucose-6-phosphate
dehydrogenase Deficiency)• & your grains (HLA-DQ2 – Celiac disease)• & your iron (HFE - Hemochromatosis)• Get more rest (HLA-DR2 - Narcolepsy)
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Generic Health advice (UNLESS)
• Exercise (Hypertrophic Cardiomyopathy)• Drink your milk (MCM6 Lactose intolerance)• Eat your green beans (glucose-6-phosphate
dehydrogenase Deficiency)• & your grains (HLA-DQ2 – Celiac disease)• & your iron (HFE - Hemochromatosis)• Get more rest (HLA-DR2 - Narcolepsy)
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Generic Health advice (UNLESS)
• Exercise (Hypertrophic Cardiomyopathy)• Drink your milk (MCM6 Lactose intolerance)• Eat your green beans (glucose-6-phosphate
dehydrogenase Deficiency)• & your grains (HLA-DQ2 – Celiac disease)• & your iron (HFE - Hemochromatosis)• Get more rest (HLA-DR2 - Narcolepsy)
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EGFR based therapy in mCRC
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Overview
Personalized Medicine,
Biomarkers …
… Molecular Profiling
First Generation Molecular Profiling
Next Generation Molecular Profiling
Next Generation Epigenetic Profiling
Concluding Remarks
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Before molecular profiling …
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Before molecular profiling …
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Before molecular profiling …
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First Generation Molecular Profiling
• Flow cytometry correlates surface markers, cell size and other parameters
• Circulating tumor cell assays (CTC’s) quantitate the number of tumor cells in the peripheral blood.
• Exosomes are 30-90 nm vesicles secreted by a wide range of mammalian cell types.
• Immunohistochemistry (IHC) measures protein expression, usually on the cell surface.
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First Generation Molecular Profiling
• Gene sequencing for mutation detection
• Microarray for m-RNA message detection • RT-PCR for gene expression
• FISH analysis for gene copy number • Comparative Genome Hybridization (CGH) for
gene copy number
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Basics of the “old” technology
• Clone the DNA.• Generate a ladder of labeled (colored)
molecules that are different by 1 nucleotide.• Separate mixture on some matrix.• Detect fluorochrome by laser.• Interpret peaks as string of DNA.• Strings are 500 to 1,000 letters long• 1 machine generates 57,000 nucleotides/run• Assemble all strings into a genome.
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Genetic Variation Among People
0.1% difference among people
GATTTAGATCGCGATAGAGGATTTAGATCTCGATAGAG
Single nucleotide polymorphisms(SNPs)
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The genome fits as an e-mail attachment
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First Generation Molecular Profiling
• Gene sequencing for mutation detection
• Microarray for m-RNA message detection • RT-PCR for gene expression
• FISH analysis for gene copy number • Comparative Genome Hybridization (CGH) for
gene copy number
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mRNA Expression Microarray
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First Generation Molecular Profiling
• Gene sequencing for mutation detection
• Microarray for m-RNA message detection • RT-PCR for gene expression
• FISH analysis for gene copy number • Comparative Genome Hybridization (CGH) for
gene copy number
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Overview
Personalized Medicine,
Biomarkers …
… Molecular Profiling
First Generation Molecular Profiling
Next Generation Molecular Profiling
Next Generation Epigenetic Profiling
Concluding Remarks
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Basics of the “new” technology
• Get DNA.• Attach it to something.• Extend and amplify signal with some color
scheme.• Detect fluorochrome by microscopy.• Interpret series of spots as short strings of
DNA.• Strings are 30-300 letters long• Multiple images are interpreted as 0.4 to 1.2
GB/run (1,200,000,000 letters/day). • Map or align strings to one or many genome.
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Next Generation Technologies
• Roche (454)–Emulsion PCR–Polymerase–Natural Nucleotides
• 100-500 Mb for 5-15k –1% error rate–Homopolymers
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One additional insight ...
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Read Length is Not As Important For Resequencing
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
8 10 12 14 16 18 20
Length of K-mer Reads (bp)
% o
f P
aire
d K
-mer
s w
ith
Un
iqu
ely
Ass
ign
able
Lo
cati
on
E.COLI
HUMAN
Jay Shendure
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Short Read Techologies
• Illumina GA (HiSeq, MySeq)
• ABI SOLID
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Other second generation technology: (ABI) SOLID
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So what ?
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Second generation DNA/RNA profiling
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Second Generation DNA profiling
• Enrichment Sequencing• ChIP-Seq (Chromosome
Immunoprecipitation)• A substitute for ChIP-chip• Eg. to find the binding sequence of
proteins (TFBS)
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Paired End Reads are Important!
Repetitive DNAUnique DNA
Single read maps to multiple positions
Read 1 Read 2
Known Distance
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Paired End Reads are Important!
Repetitive DNAUnique DNA
Single read maps to multiple positions
Read 1 Read 2
Known Distance
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Second Generation DNA profiling
• Exome Sequencing (aka known as targeted exome capture) is an efficient strategy to selectively sequence the coding regions of the genome to identify novel genes associated with rare and common disorders.
• 160K exons
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Second Generation DNA profiling
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Second Generation DNA profiling
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Bioinformatics tools
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Bioinformatics tools
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Con
tent
s-S
ched
ule
Besides the 6000 protein coding-genes …
140 ribosomal RNA genes275 transfer RNA gnes40 small nuclear RNA genes>100 small nucleolar genes
Function of RNA genes
pRNA in 29 rotary packaging motor (Simpson et el. Nature 408:745-750,2000)Cartilage-hair hypoplasmia mapped to an RNA (Ridanpoa et al. Cell 104:195-203,2001)The human Prader-Willi ciritical region (Cavaille et al. PNAS 97:14035-7, 2000)
Second Generation RNA profiling
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RNA genes can be hard to detects
UGAGGUAGUAGGUUGUAUAGU
C.elegans let-27; 21 nt (Pasquinelli et al. Nature 408:86-89,2000)
Often smallSometimes multicopy and redundantOften not polyadenylated (not represented in ESTs)Immune to frameshift and nonsense mutationsNo open reading frame, no codon biasOften evolving rapidly in primary sequence
Second Generation RNA profiling
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Although details of the methods vary, the concept behind RNA-seq is simple:
• isolate all mRNA• convert to cDNA using reverse transcriptase• sequence the cDNA• map sequences to the genome
The more times a given sequence is detected, the more abundantly transcribed it is. If enough sequences are generated, a comprehensive and quantitative view of the entire transcriptome of an organism or tissue can be obtained.
Second Generation RNA profiling
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• Comparing to microarray– Microarray
• Closed technology: Prior knowledge required• Affected by pseudo-genes (homologous of real genes)• Low sensitivity
– RNA-Seq• Open technology: No prior knowledge required• Not affected by pseudo-genes because exact
sequence is measured• Other information could be yielded (SNP, Alternative
splicing)
Second Generation RNA profiling
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ncRNAs in human genome
tRNA 60018S rRNA 2005.8S rRNA 20028S rRNA 2005S rRNA 200snoRNA 300miRNA 250U1 40U2 30U4 30U5 30U6 20U4atac 5U6atac 5U11 5U12 5
SRP RNA 1
RNase P RNA 1
Telomerase RNA 1
RNase MRP 1
Y RNA 5
Vault 4
7SK RNA 1
Xist1
H191
BIC1
Antisense RNAs 1000s?
Cis reg regions 100s?
Others ?
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Mapping Structural Variation in Humans
- Thought to be Common 12% of the genome (Redon et al. 2006)
- Likely involved in phenotype variation and disease
- Until recently most methods fordetection were low resolution (>50 kb)
CNVs
>1 kb segments
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Size Distribution of CNV in a Human Genome
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Next next generation sequencing
Third generation sequencing
Now sequencing
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Ultra-low-cost SINGLE molecule sequencing
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Pacific Biosciences: A Third Generation Sequencing Technology
Eid et al 2008
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Complete genomics
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Nanopore Sequencing
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Second Generation Protein profiling
• Proteomics MS-MS-based exclusively in discovery mode
• Automate diagnostics assay generation (next generation proteomics)• Aptamers as alternative to antibodies• ImmunoPCR
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MS/MS identification pipeline
pipeline overview
Bonanza
Bonanza + IggyPep
Goaldefine PTMs profile
prior to database
search
Goalmulti-tiered
database search
Goalfilter
dataset prior to
database search
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Second Generation Protein profiling
• Proteomics MS-MS-based exclusively in discovery mode
• Automate diagnostics assay generation (next generation proteomics)• Aptamers as alternative to antibodies• ImmunoPCR
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Overview
Personalized Medicine,
Biomarkers …
… Molecular Profiling
First Generation Molecular Profiling
Next Generation Molecular Profiling
Next Generation Epigenetic Profiling
Concluding Remarks
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CONFIDENTIAL
Defining Epigenetics
Reversible changes in gene expression/function
Without changes in DNA sequence
Can be inherited from precursor cells
Allows to integrate intrinsic with environmental signals (including diet)
Methylation I Epigenetics | Oncology | Biomarker
Genome
DNA
Gene Expression
Epigenome
Chromatin
Phenotype
I NEXT-GEN | PharmacoDX | CRC
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CONFIDENTIAL
Methylation I Epigenetics | Oncology | Biomarker
I NEXT-GEN | PharmacoDX | CRC
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CONFIDENTIAL
Epigenetic Regulation: Post Translational Modifications to Histones and Base Changes in DNA
Epigenetic modifications of histones and DNA include:– Histone acetylation and methylation, and DNA methylation
HistoneAcetylation
HistoneMethylation
DNA Methylation
MeMe
Ac
Me
Methylation I Epigenetics | Oncology | Biomarker
I NEXT-GEN | PharmacoDX | CRC
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CONFIDENTIAL
MGMT BiologyO6 Methyl-Guanine Methyl Transferase
Essential DNA Repair Enzyme
Removes alkyl groups from damaged guanine bases
Healthy individual: - MGMT is an essential DNA repair enzymeLoss of MGMT activity makes individuals susceptible to DNA damage and prone to tumor development
Glioblastoma patient on alkylator chemotherapy: - Patients with MGMT promoter methylation show have longer PFS and OS with the use of alkylating agents as chemotherapy
Methylation I Epigenetics | Oncology | Biomarker
I NEXT-GEN | PharmacoDX | CRC
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CONFIDENTIAL
MGMT Promoter Methylation Predicts Benefit form DNA-Alkylating Chemotherapy
Post-hoc subgroup analysis of Temozolomide Clinical trial with primary glioblastoma patients show benefit for patients with MGMT promoter methylation
0
5
10
15
20
25Median Overall Survival
21.7 months
12.7 months
radiotherapy
plus temozolomide
Methylated MGMT Gene
Non-Methylated MGMT Gene
radiotherapy
Adapted from Hegi et al.NEJM 2005352(10):1036-8.Study with 207 patients
Methylation I Epigenetics | Oncology | Biomarker
I NEXT-GEN | PharmacoDX | CRC
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CONFIDENTIAL
Genome-wide methylation by methylation sensitive restriction enzymes
Methylation I Epigenetics | Oncology | Biomarker
I NEXT-GEN | PharmacoDX | CRC
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CONFIDENTIAL
Genome-wide methylation by probes
Methylation I Epigenetics | Oncology | Biomarker
I NEXT-GEN | PharmacoDX | CRC
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CONFIDENTIAL
MBD_Seq
DNA Sheared
Immobilized Methyl Binding Domain
Methylation I Epigenetics | Oncology | Biomarker
Condensed Chromatin
DNA Sheared
I NEXT-GEN | PharmacoDX | CRC
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CONFIDENTIAL
Immobilized Methyl binding domain
MgCl2
Next Gen SequencingGA Illumina: 100 million reads
MBD_Seq
Methylation I Epigenetics | Oncology | Biomarker
I NEXT-GEN | PharmacoDX | CRC
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Overview
Personalized Medicine,
Biomarkers …
… Molecular Profiling
First Generation Molecular Profiling
Next Generation Molecular Profiling
Next Generation Epigenetic Profiling
Concluding Remarks
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Math
Informatics
Bioinformatics, a life science discipline … management of expectations
Theoretical Biology
Computational Biology
(Molecular)Biology
Computer Science
BioinformaticsDiscovery Informatics – Computational Genomics
Interface Design
AI, Image Analysisstructure prediction (HTX)
Sequence Analysis
Expert Annotation
NPDatamining
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Translational Medicine: An inconvenient truth
• 1% of genome codes for proteins, however more than 90% is transcribed
• Less than 10% of protein experimentally measured can be “explained” from the genome
• 1 genome ? Structural variation• > 200 Epigenomes ??
• Space/time continuum …
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Translational Medicine: An inconvenient truth
• 1% of genome codes for proteins, however more than 90% is transcribed
• Less than 10% of protein experimentally measured can be “explained” from the genome
• 1 genome ? Structural variation• > 200 Epigenomes …
• “space/time” continuum
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Epigenetic (meta)information = stem cells
Cellular programming
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Cellular reprogramming
Tumor
Epigenetically altered, self-renewing cancer stem cells
Tumor Development and Growth
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Gene-specificEpigeneticreprogramming
Cellular reprogramming
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