xt n sequencing - pbgworkspbgworks.org/sites/pbgworks.org/files/01 vandeynze sequencing_0.pdf ·...
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Next generation sequencing
Allen Van Deynze
UC DavisUC Davis
November 16th, 2010
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Marker development considerations
How to sequence?qWhat part of the DNA to sequence?
Talk 2What lines to sequence?How many lines to sequence?y
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Sequencing DNA
The goal of sequencing DNA is to tell the order of the bases, or nucleotides, that form the inside of the double-helix molecule.
Hi h th h t i th dHigh throughput sequencing methods
• Sanger/Dideoxy
• 2nd generation (NextGen)
• 3rd generation
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Sanger Dideoxy DNA sequencing
650-1000 bp
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454-Pyrosequencing
Perform emulsion PCR
Construct Single stranded adaptor ligated
DNA Depositing DNA Beads into the PicoTiter™Plate
Sequencing by Synthesis:Sequencing by Synthesis:Simultaneous sequencing of the entire genome in
hundreds of thousands of picoliter-size wells
P h h t i l tiPyrophosphate signal generation
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Solexa/lIlumina Sequencing
• Sequencing by synthesis (not chain termination)• Generate up to 100 Gb per run• Generate up to 100 Gb per run
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Helicos-True Single Molecule Sequencing (tSMS)™
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Single Molecule Real Time sequencing
10 bp/sec
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Ion Torrent
In nature, when a nucleotide is incorporated into a strand of DNA by a polymerase, a hydrogen ion is released as a byproduct.
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Sequencing technology 2010
Length of MB/run Cost/MB
Length of reads (bp)
Sanger 0.29 4,333 700Roche 454 180 55 56 175 450Roche 454 180 55.56 175-450Illumina 20,000 0.50 30-125Illumina 2010 100,000 0.10 85-100Helicos 500,000 0.02? 25Ion Torrent ? ? 25Pacific Bio 1,000 ? >1000,
2010- 10-50 faster..and cheaper
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Next generation sequencing
Allen Van Deynze
UC DavisUC Davis
November 16th, 2010
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Marker development considerations
How to sequence?qWhat part of the DNA to sequence?
Talk 2What lines to sequence?How many lines to sequence?y
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Where to sequence?Eukaryotic Genomes and Gene Structures
G GeneGeneIntergenic IntergenicGene GeneGeneIntergenicRegion
IntergenicRegion
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Locus/Gene
Gene models
Full length cDNAs
Expressed Sequence Tags
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Transcriptome sequencing IlluminaLibrary creation/QC GAII sequencing
(single and paired end)350
Root L f 350LeafFlowerFruit
Assembly
Data Collection
Analysis: transcriptome complexitySNP calling/validation
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Sequencing all of the EST
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Sequencing beyond ESTs
Whole Genome Shotgun SequencingStart with a whole genomeStart with a whole genomeShear the DNA into many different, random segments.gSequence each of the random segments.Then, put the pieces back together again inThen, put the pieces back together again in their original order using a computer
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Anatomy of a WGS Assembly
ChromosomeChromosomeSTSSTS
Genetic and physical map
ChromosomeChromosome
STSSTS--mapped Scaffoldsmapped Scaffolds
ContigContig
G ( & td d K )G ( & td d K )
Pac BioSanger
Gap (mean & std. dev. Known)Gap (mean & std. dev. Known)Read pair (mates)Read pair (mates)
ConsensusConsensus
454Illumina Ion Torrent
Reads (of several haplotypes)Reads (of several haplotypes)
SNPsSNPs
Ion TorrentHelicos
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So what?
Anchored Genome AssemblyyGene functionGene orderGene orderGene modelAlleleFunctional mutation
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Genome Browser