bioinformatique et séquençage haut débit, paris march 2010...
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March 29, 2010 Bioinformatique et Séquencage Haut Débit, Paris March 2010
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Discovery and Quantification of RNA with RNASeq
Roderic Guigó SerraCentre de Regulació Genòmica (CRG)
Bioinformatique et Séquençage Haut Débit, Paris March 2010
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March 29, 2010 Bioinformatique et Séquencage Haut Débit, Paris March 2010
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RNA
• Transcription to RNA and subsequent processing is the first step in the unfolding of the intructions encoded in the DNA.
• There is a one-to-one correspondence between the RNA content of the cell and the cellular phenotype (which is obviolusly not true for the DNA)
• The phenotypic effects of the variations in the DNA are ultimately mediated by variations in the RNA content of cell.
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March 29, 2010 Bioinformatique et Séquencage Haut Débit, Paris March 2010
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cDNA cloning and sequencing
IBM Systems Journal, Inman et al (2001) , Deep Computing for life Sciences
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high dynamic range in RNA abundance
• RNA species vary greatly in abundance. Typically (Carninci et al., 2000)
– 5-10 highly expressed species. thousands of copies ~ 20% of the mRNA mass
– 500-2000 intermediate species. hundreds of copies 40%-60% of the mRNA mass
– 10,000-20,000 rare messages. a few copies<20%-40% of the mRNA mass
• Random clone selection is ineffective in recovering low abundance transcripts.
• Normalization strategies are required, but the destroy transript abundances
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DNA microarrays
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Alternative splicing
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Next generation sequencing
technologies.
• They MAY provide enough sequence depth, so that the (unbiased) sequencing of the RNA complement of the cell MAY become feasible.
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Deep sequencing of PTB knockdown
• The polypyrimidine tract binding protein (PTB) is an important regulator of alternative splicing
• Poly A+ RNA from Hela cells in two conditions– Control– Knock-down of PTB
• Single reads 11M +10.7M
• Paired-end reads– Short insert size: 200-250 nt 41M + 21.5M– Long insert size: 600-650 nt 32.6M + 17.7M
• Total 135M reads (85M control)Vincent LacroixHeinz HimmelbauerJuan ValcárcelChris Smith
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Mapping reads to the annotated genome/transcriptome
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Differential gene expression
Condition 1
Condition 2
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Differential gene expression in non coding genes
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Differential gene expression between control and knockdown
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Mapping of RNAseq reads is not trivial
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Mapping of RNAseq reads is not trivial
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Reads mapping to the splice junctions
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March 29, 2010 Bioinformatique et Séquencage Haut Débit, Paris March 2010
RNAseq vs splicing arrays
75% of the cases detected by arrays are confirmed by RNAseq 81% for highly expressed events (>5 reads)
EURASNET CONSORTIUM. 255 known targets estalished using splicing arrays, and validated through Q-PCR and proteomics
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Detection of new PTB targets
Fisher’s exacttest
March 29, 2010 17Bioinformatique et Séquencage Haut Débit, Paris March 2010
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March 29, 2010 Bioinformatique et Séquencage Haut Débit, Paris March 2010
Detection of new PTB targets
31 candidates identified– 30 with evidence of alternative splicing
selected for experimental verification by Q-PCR
– 20 confirmed (66.7%). Identification of previously unknown PTB targets
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Novel splice junctions
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Novel splice junctions
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March 29, 2010 Bioinformatique et Séquencage Haut Débit, Paris March 2010
• Paired-end reads: the two reads are read from the same molecule
• Mapping: The two reads from a pair are mapped independently, and uniquely
• Interchromosomal interaction: There are cases where the two reads map to different chromosomes (1.6 % of short inserts, 2.8% of long inserts)– 382,639 interchromosomal interactions
• rRNA 14%• chrM 33%
Interchromosomal interactions
26nt 26nt
250nt
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March 29, 2010 Bioinformatique et Séquencage Haut Débit, Paris March 2010
Clustering of read pairs
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• Read pairs are clustered when both read mappings overlap
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March 29, 2010 Bioinformatique et Séquencage Haut Débit, Paris March 2010
Interchromosomal interactions as detected by paired-end reads, long inserts, controlOnly interactions supported by more than 100 pairs are shown
Interchromosomal transcripts
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transcriptional network. Ch21
RACEarrays
Gingeras,Antonarakis,Reymond,Kapranov,Salehi-Ashtiani,…
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The higher the connectivity of the transcripts, the higher the coexpression
Hubs have higher phylogenetic depth than no hubs
Distal sites of transcription associate to sites of chromosome interaction(Job Dekker, John Stamm)
Sarah DjebaliJulien LagardeVincent LacroixSylvain Foissac
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Transcript quantification
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Reconstructing transcript abundances from short sequence reads
Micha SammetVincent LacroixPaolo Ribeca
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the problem can be posed as a system of linear equations
A B C
CBC
CAB
CA
CC
CB
XABC
XAB
CBC = XABC
CAB = XABC + XAB
CA = XABC + XAB CC = XABC
CB = XABC + XAB V. Lacroix, M. Sammeth, R. Guigo, A. Bergeron. Exact transcriptome reconstruction from short sequence reads. WABI (2008)
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The system of equations is often underdetermined: different transcriptomes result
in exactly the same set of sequenced reads
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How bad is this in the practice?
• GENCODE annotation of the ENCODE pilot regions (44 regions, 1% of the human genome)– 681 genes and 2981 variants
• Assume “unlimited” number of single reads equally distributed across the transcript length (“infinite” coverage)
• If we do not assume the underlying transcriptome--that is, all combinations of annotated exons are possible--we can only unequivocally determine the abundance of 30 variants.
• Assuming that the underlying transcriptome, however we can determine the abundances in all cases, but one.
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The Flux Capacitor. Micha Sammeth
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The Flux Capacitor
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Read density bias along transcripts
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RNAseqsimulator
First, given a transcript annotation, and a model of transcript abundance
Then, the simulator produces a transcriptome (a set of transcripts with abundances attached)
Second, it simulates the different steps of the sequencing experiment (RT, nebulization, etc)
To produce a set of sequence reads as realistic as possible
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RNAseq simulator; simulating the transcriptome
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Quantitative assessment
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Sequence of the transcriptome of 60 CEU individuals for the HapMap project.
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• ~10 million reads provide access to the same dynamic range as arrays with better quantification of alternative and highly abundant transcripts.
• Correlation with SNPs leads to a larger discovery of eQTLs than with arrays.– eQTLs are discovered with similar frequencies in protein coding and
long non coding RNAs • a substantial number of variants influence the structure of mature
transcripts indicating variants responsible for alternative splicing. • Measures of allele- specific expression allow for the identification of rare
eQTLs and allelic differences in transcript structure
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Significant eQTL with opposite effect in two different isoforms of the gen HLA-DRA
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NextGeneid: transcript assembly and discovery
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http://gemlibrary.sourceforge.net
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Paolo Ribeca
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http://flux.sammeth.net/
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Micha Sammet
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