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Sean Davis, M.D., Ph.D.
Genetics Branch, Center for Cancer Research
National Cancer Institute
National Institutes of Health
RNA-seq: A high-resolution
View of the Transcriptome
Normal
Karyotype
Tumor
Karyotype
The Central Dogma
phenotype
Gene Copy
Number
Sequence
Variation
Chromatin
Structure and
Function
Gene
Expression
Transcriptional
Regulation
DNA
Methylation
Patient and
Population
Characteristics
Your Nature Paper
High Throughput
Sequencing
AKA, NGS
DNA
(0.1-1.0 ug)
Single molecule array
Sample preparation
Cluster growth
5’
5’3’
G
T
C
A
G
T
C
A
G
T
C
A
C
A
G
T
C
A
T
C
A
C
C
T
A
G
C
G
T
A
G
T
1 2 3 7 8 94 5 6
Image acquisition Base calling
T G C T A C G A T …
Sequencing
Illumina SBS Technology
Reversible Terminator Chemistry Foundation
© Illumina, Inc.http://www.illumina.com/technology/sequencing_technology.ilmn
http://seqanswers.com/forums/showthread.php?t=21
Single end vs paired end sequencing
Illumina Paired-end
sequencingPaired-end: useful for RRBS, essential for RNA-seq, not useful for ChIP-
seq
What comes out of the machine:
short reads in fastq format
@D3B4KKQ1_0166:8:1101:1960:2190#CGATGT/1
CTCCTGGAAAACGCTTTGGTAGATTTGGCCAGGAGCTTTCTTTTATGTAAATTG
+D3B4KKQ1_0166:8:1101:1960:2190#CGATGT/1
[^^cedeefee`cghhhfcRX`_gfghf^bZbecg^eeb[caef`ef^a_`eXa
@D3B4KKQ1_0166:8:1101:2154:2137#CGATGT/1
TCCANCCATGGCAAATTCCATGGCACCGTCAAGGCTGAGAACGGGAAGCTTGTC
+D3B4KKQ1_0166:8:1101:2154:2137#CGATGT/1
ab_eBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB
@D3B4KKQ1_0166:8:1101:2249:2171#CGATGT/1
TACAAGTGCAGCATCAAGGAGCGAATGCTCTACTCCAGCTGCAAGAGCCGCCTC
+D3B4KKQ1_0166:8:1101:2249:2171#CGATGT/1
_[_ceeec[^eeghdffffhh^efh_egfhfgeec_fbafhhhhd`caegfheh
@D3B4KKQ1_0166:8:1101:2043:2187#CGATGT/1
GAAGGAGAGAAGGGGAGGAGGGCGGGGGGCACCTACTACATCGCCCTCCACATC
+D3B4KKQ1_0166:8:1101:2043:2187#CGATGT/1
^_accceg`gga`f[fgcb`Ucgfaa_LVV^[bbbbbRWW`W^Y[_[^bbbbb
@D3B4KKQ1_0166:8:1101:2188:2232#CGATGT/1
GTGGCCGATTCCTGAGCTGTGTTTGAGGAGAGGGCGGAGTGCCATCTGGGTAGC
+D3B4KKQ1_0166:8:1101:2188:2232#CGATGT/1
QS to int In
R:
as.integer(ch
arToRaw(‘e'))
-33
Pair end sequencing
s_8_1_sequence.txt.gz s_8_2_sequence.txt.gz
@D3B4KKQ1_0166:8:1101:1960:2190#CGATGT/1
CTCCTGGAAAACGCTTTGGTAGATTTGGCCAGGAGCTTTCTTTTATGTAAATTG
+D3B4KKQ1_0166:8:1101:1960:2190#CGATGT/1
[^^cedeefee`cghhhfcRX`_gfghf^bZbecg^eeb[caef`ef^a_`eXa
@D3B4KKQ1_0166:8:1101:2154:2137#CGATGT/1
TCCANCCATGGCAAATTCCATGGCACCGTCAAGGCTGAGAACGGGAAGCTTGTC
+D3B4KKQ1_0166:8:1101:2154:2137#CGATGT/1
ab_eBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB
@D3B4KKQ1_0166:8:1101:2249:2171#CGATGT/1
TACAAGTGCAGCATCAAGGAGCGAATGCTCTACTCCAGCTGCAAGAGCCGCCTC
+D3B4KKQ1_0166:8:1101:2249:2171#CGATGT/1
_[_ceeec[^eeghdffffhh^efh_egfhfgeec_fbafhhhhd`caegfheh
@D3B4KKQ1_0166:8:1101:2043:2187#CGATGT/1
GAAGGAGAGAAGGGGAGGAGGGCGGGGGGCACCTACTACATCGCCCTCCACATC
+D3B4KKQ1_0166:8:1101:2043:2187#CGATGT/1
^_accceg`gga`f[fgcb`Ucgfaa_LVV^[bbbbbRWW`W^Y[_[^bbbbb
@D3B4KKQ1_0166:8:1101:2188:2232#CGATGT/1
GTGGCCGATTCCTGAGCTGTGTTTGAGGAGAGGGCGGAGTGCCATCTGGGTAGC
+D3B4KKQ1_0166:8:1101:2188:2232#CGATGT/1
aa_eeeeegggggihhiiifgeghfeghbgcghifiidg^dbgggeeeee`dcd
@D3B4KKQ1_0166:8:1101:1960:2190#CGATGT/2
GGCATATTTAACAGCATTGAACAGAATTCTGTGTCCTGTAAAAAAATTAGCTTA
+D3B4KKQ1_0166:8:1101:1960:2190#CGATGT/2
a__aaa`ce`cgcffdf_acda^ea]befffbeged`g[a`e_caaac]cb`gb
@D3B4KKQ1_0166:8:1101:2154:2137#CGATGT/2
TTGAGGCTGTTGTCATACTTCTCATGGTTCACACCCATGACGAACATGGGGGCG
+D3B4KKQ1_0166:8:1101:2154:2137#CGATGT/2
a__eeeeeggegefhhhiiihhhhhiieghhhghhiiffhiififhhiihegic
@D3B4KKQ1_0166:8:1101:2249:2171#CGATGT/2
CGGGGTGCACCTCGTCGTAGAGGAACTCTGCCGTCAGCTCTGCCCCATCGCCAA
+D3B4KKQ1_0166:8:1101:2249:2171#CGATGT/2
^__ee__cge`cghghhfgddgfgi]ehhfffff^ec[beegidffhhfhadba
@D3B4KKQ1_0166:8:1101:2043:2187#CGATGT/2
CTTAGTCTCAGTTTTCCTCCAGCAGCCTGAGGAAACTCAAAGGCACAGTTCCCA
+D3B4KKQ1_0166:8:1101:2043:2187#CGATGT/2
_abeaaacg^g^eghhhhgafghhdfghfedeghfiiicfbgdHYagfeecggf
@D3B4KKQ1_0166:8:1101:2188:2232#CGATGT/2
TAGGCTCAAAGTCTAACGCCAATCCCGAACCTGGGCATCTGTACACACACACAC
+D3B4KKQ1_0166:8:1101:2188:2232#CGATGT/2
abbeceeegggcghiihiihhhhiifhiiiiihiiiiiiihegh`eggfebfhg
… …
RNA-seq protocol schematic
Our First Experiment
Overview of BAC in the Genome
Sequencing a BAC
Sequence Coverage
Repeats
Repeats
Repeats are not created equal
Approaches to RNA-seq
Nature Biotech (2010) 28, 421-423
Alignment
RNA-seq Alignment
Run Time
Alignment Yield
Splice Read Placement Accuracy
Impact on Transcript Assembly
Transcript Quantification
Models for RNA-seq
• Count-based models
• Multi-reads (isoform resolution)
• Paired-end reads (include length resolution
step)
• Positional bias along transcript length
• Sequence bias
Read Counting
Mortazavi, 2008, NMeth
L. Pachter (2011) arXiv:1104.3889v
Sequence Bias--priming
Hansen (2010), NAR
Sample-specific Sequence Bias
Models for RNA-seq
Result of Quantification
Clustering and Visualization
Hierarchical Clustering
Gene 1
Gene 2
Gene 3
Gene 4
Gene 5
Gene 6
Gene 7
Gene 8
Hierarchical Clustering
Gene 1
Gene 2
Gene 3
Gene 4
Gene 5
Gene 6
Gene 7
Gene 8
Hierarchical Clustering
Gene 1
Gene 2
Gene 3
Gene 4
Gene 5
Gene 6
Gene 7
Gene 8
Hierarchical Clustering
Gene 1
Gene 2
Gene 3
Gene 4
Gene 5
Gene 6
Gene 7
Gene 8
Distance Metrics
 Euclidean distance
 Manhattan distance
 Minkowski distance (generalized distance)
Distance Metrics
• Correlation
– maximum value of 1 if X and Y are perfectly correlated
– minimum value of -1 if X and Y are exactly opposite
– d(X,Y) = 1 – rxy
• Many, many others
• Choice of distance metric can be driven by
underlying data (eg., binary data, categorical data,
outliers, etc.)
Example of Distance Metric Choice
Example
• dat = matrix(rnorm(10000),ncol=20)
• dat[1:100,1:10] = dat[1:100,1:10]+1
• hclust
• dist
• as.dist(1-cor)
Differential Expression
MA Plot
64
65
66
67
68
DE False Positive Rates
DE Evaluation
DE Software Runtime
RNA-seq workflow as
proposed by Anders et al.
in Nature Protocols
MA Plot
Fusion Gene Detection
Fusion gene schematic
Fusion Detection
False Positive Fusion Detection
Experimental Design
• What are my goals?
– Differential expression?
– Transcriptome assembly?
– Identify rare, novel trancripts?
• System characteristics?
– Large, expanded genome?
– Intron/exon structures complex?
– No reference genome or transcriptome
Experimental Design
• Technical replicates
– Probably not needed due to low technical variation
• Biological replicates
– Not explicitly needed for transcript assembly
– Essential for differential expression analysis
– Number of replicates often driven by sample
availability for human studies
– More is almost always better
Links of Interest
• http://bioconductor.org
• http://biostars.org
• http://www.rna-seqblog.com/
• https://genome.ucsc.edu/ENCODE/
• http://www.ncbi.nlm.nih.gov/gds/
Visualizing Splicing

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RNA-seq: A High-resolution View of the Transcriptome

Editor's Notes

  1. I am going to spend a few minutes illustrating how existing and emerging high-throughput genomic technologies are being used to understand cancer, a mindnumbingly complex and disregulated biologic process.
  2. The first karyotypes were produced in 1956. Shown here is a comparison of a normal karyotype of a normal female and one from a tumor. By 1960, a karyotype of a cancer genome revealed the presence of the Philadelphia chromosome. Now known to represent the BCR-ABL fusion protein, it was not until 33 years later in 1993 that a drug, gleevec, become available that targeted the fusion product. By applying high-throughput microarray technologies, the Cancer Genetics Branch is striving to make observations of the cancer genome that will provide deeper understandings of the biology of cancer, to develop prognostic and diagnostic markers to improve patient-specific treatments, and to find promising targets for directed drug therapy.
  3. Since Knudson’s famous hypothesis proposing the two-hit model, our understanding of cancer as a genetic disease has progressed to the realization that cancer is not often a function of a single gene gone awry, but probably represents a complex interaction of multiple processes in the genome including altered copy number, gene expression, transcriptional regulation, chromatin modification, sequence variation, and DNA methylation. It is vital to the goal of producing better patient outcomes to understand not only what genes are involved in a certain type of cancer, but also how these other processes affect gene regulation. In short, an integrated view of the cancer genome is necessary and is now becoming possible.