analysis of long non-coding rnas expression profiles in ...€¦ · analysis of long non-coding...
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CHARLES
PERKINS CENTRE
Analysis of long non-coding RNAs expression profiles in ovarian CAF
June 2015
Fatemeh Vafaee
Charles Perkins Centre
School of Mathematics and Statistics
The University of Sydney
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Background
› Research Fellow,
- Charles Perkins Centre and School of Mathematics & Statistics, University of Sydney
- Research topic: Personalised Medicine, Systems biology, Integrative Computational Modelling, Bioinformatics
› Postdoctoral Associate,
- University of Toronto, University Health network, Princess Margaret Hospital
- Research topic: Integrative computational biology, Cancer Informatics
• Genomic cancer profiles analysis, cancer gene signature identification, PPI prediction, genome-level drug effectiveness quantification
› Ph.D.,
- University of Illinois at Chicago, Artificial Intelligence Laboratory
- Research topic: Artificial Intelligence:
• Optimization and search algorithms, evolutionary algorithms, machine learning, data mining, information retrieval
• Computational biology: PPI network alignment, phylogenetic network reconstruction, genome-wide association studies
› B.Sc., Sharif University of Technology, Computer Engineering Department
Academic Qualifications and Positions
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Epithelial Ovarian Cancer
› About 9 out of 10 tumours of the ovary diagnosed (90%) are this type
› 6th most common cause of cancer death
› 5-year survival ~ 40% (<25% in advanced disease)
› Recurrence of chemoresistant disease common
› Standard treatment has not changed in decades
› Poor prognosis
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The Tumour Microenvironment
Adapted from Mayorca-Guiliani et. al. 2013 OncoTargets and Therapy
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Cancer-associated fibroblasts (CAFs)
› Produce extracellular matrix
› In other cancers they communicate with
tumour cells and other cells in the tumour
microenvironment to:
- Promote invasion and metastasis
- Promote chemoresistance
- Promote angiogenesis (the formation of
blood vessels)
- Help create an immunosuppressive
microenvironment
Tumour cells
CAFs
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Stroma influences prognosis
Tothill RW et al 2008 Clinical Cancer
Research
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Somatic mutations in CAFs are rare
Therefore other mechanisms that regulate gene expression and
function may be involved
Qui W et. al. 2008 Nat Genet
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lncRNAs may contribute to the CAF phenotype
› lncRNAs are non-protein-coding RNAs > 200 nucleotides long
› Increasingly recognized to play functional roles in cancer.
› Do lncRNAs play a functional role in CAFs?
Wahlestedt C 2013 Nat Reviews
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Analytical questions
9
Are lncRNAs differentially expressed in
ovarian CAFs vs. normal ovarian
fibroblasts?
What are their potential mechanisms,
functions, and pathways of relevance?
DE Analysis
Functional Analysis
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Identifying differentially expressed lncRNAs
MicroenvironmentEpithelium
Tumor-associated
fibroblasts
Normal
fibroblasts
U133 Plus 2.0
GeneChip microarray
Data Mining and Statistical Analysis
BRB ArrayTools
(Mok SC et. al. 2009 Cancer Cell)
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Clinical Samples
› 79 microdissected fibroblast samples
- 69 late-stage, high-grade serous tumors
- 10 normal ovarian sample
› Clinical Information:
- Survival (months)
- Chemo-response
- … 26
19
6
11
Number
Chemo Response
Sensitive
Resistance
Sens/Res
Refractory
Alive
14 - 23%
Deceased
47- 77%
Mean: 27.9 mo
Range: 7-175 mo
Mean: 101.4 mo
Range: 15-184 mo
Survival
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6 8 10
0.0
0.5
1.0
1.5
de
ns
ity
Identifying differentially expressed (DE) lncRNAs
Data preprocessing
Identifying lnc-RNAs
DE-Analysis
› Background Correction
› Normalization
- Robust Multi-array Average
› Log transformation
› Probes identified as lncRNAs from Zhang X. et. al. 2012
were used which identifies 2,448 probes as lncRNAs
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DE Analysis
› Differentially expressed probes between cancerous vs. normal samples were
calculated using limma (Linear Models for Microarray Data) package from
Bioconductor.
› P-values where adjusted using FDR method
- Multiple hypothesis problem occurs when one considers a set of hypothesis tests
simultaneously (it is more likely that one incorrectly reject the null hypothesis)
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› Significance cutoff of fold-change >2 and a adjusted p-value < 0.05 used to identify DE-lncRNAs in CAFs vs NFs
- 54 lncRNAs were identified
Identifying DE lncRNAs (Volcano plot)
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Principle Component Analysis
15
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lncRNA Proposed functions/ interactions
XISTX-chromosomal inactivation, downregulated in female cancers including ovarian,
possible association with chemoresistance
H19Downregulated in metastatic ovarian cells compared to nonmetastasic, targets
TGFβ1
TUG1 Regulated by TP53 and FSHR, decreased in NSCLC
NEAT1Assembly of nuclear paraspeckles, target of HIF2, poor prognostic factor in breast
cancer
GAS5Decreased expression is a poor prognostic factor in cervical and colorectal
cancers
CASC2 Decreased in endometrial cancers
MALAT1Decreased in metastatic ovarian cells compared to nonmetastatic, associated
with metastasis in numerous cancer types
MEG3 Decreased in gastric cancer
CRNDE Increased in colorectal cancer, regulated by mTOR signaling
DE lncRNAs
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Distribution of deregulation of chosen lncRNAs across each sample
17
Short Survival =< 21Long Survival >= 25
AC004951.6
AC009133.2
AC018470.4
AC068491.1
AC068587.3
AC091878.1
AC092620.2
AL157931.2
AL359259.1
BX322557.10
BX571672.1
C17orf91
CASC2
CTC-547D20.1
CTD-2010I22.2
EPS15P1
GAS5
H19
NCRNA00276
NEAT1
RP11-164P12.3
RP11-217E22.2
RP11-220I1.1
RP11-273G15.2
RP11-361F15.2
RP11-366M4.3
RP11-38P22.2
RP11-495P10.2
RP11-539L10.2
RP11-59E19.1
RP11-706J10.1
RP11-834C11.6
TUG1
U73166.2
XIST
From Left to right
Patient #
Up/down regulation in
patient/Ave (normal)
Age color code:
pale yellow: < 40 yrs to
dark brown > 80
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Functional Analysis
› What are the potential mechanisms of significantly de-regulated lncRNAs, their
functions, and pathways of relevance?
18
How to do this when our knowledge on the
functions of ncRNAs is pretty limited?
Looking into the functions of
highly correlated genes
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Correlation Network
› Network of genes highly correlated
(|corr| > 0.7) with the DE lncRNAs
› What are the molecular functions
over-represented by the correlated
genes?
› What are the enriched pathways?
19
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Functional Analysis
20
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Gene Set Enrichment Analysis
› GSEA is used here to determine whether an a priori defined set of genes (i.e.,
KEGG pathways) shows statistically significant concordance with each of DE
lncRNAs.
› GSEA for each lncRNA:
21
Orders all genes by
their correlation
with the lncRNA
Each pathways receives an
enrichment score (ES), which
reflects the degree to which it is
overrepresented at the top or
bottom of a ranked list of genes.
Each ES receives a
p-value based on
phenotypic
permutation test &
corrected for
multiple testing
Subramanian, Aravind, et al. PNAS 102.43 (2005): 15545-15550.
Pathaways whose corrected p-value <0.05 were selected
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Pathways overrepresented by
22
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Acknowledgment
› Bill Walsh Lab
› Kolling Institute for Medical Research
› Charles Perkins Centre
› Garvan Institute/TKCC
› Functional Genomics Lab
› Harvard Medical School
23
Funding
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Gene Set Enrichment Analysis (GSEA)
24
Subramanian, Aravind, et al. PNAS 102.43 (2005): 15545-15550.
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Background
› Research Fellow,
- Charles Perkins Centre and School of Mathematics & Statistics, University of Sydney
- Research topic: Systems biology, Integrative Computational Modelling, Bioinformatics
› Postdoctoral Associate,
- University of Toronto, University Health network, Princess Margaret Hospital
- Research topic: Integrative computational biology:
• Genomic cancer profiles analysis, cancer gene signature identification, PPI prediction, genome-level drug effectiveness quantification
› Ph.D.,
- University of Illinois at Chicago, Artificial Intelligence Laboratory
- Research topic: Artificial Intelligence:
• Optimization and search algorithms, evolutionary algorithms, machine learning, data mining, information retrieval
• Computational biology: PPI network alignment, phylogenetic network reconstruction, genome-wide association studies
› B.Sc., Sharif University of Technology, Computer Engineering Department
Academic Qualifications and Positions
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Functional Analysis
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CAFs in ovarian cancer
DMEMCAF CM
migration
invasion
What genetic factors
contribute to CAF
function?
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