RNA capture sequencing enabled liquid biopsy screening
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1 RNA capture sequencing enabled liquid biopsy screening Jo Vandesompele, Biogazelle CSO LKI symposium Liquid Biopsies & Cancer Leuven, Belgium, August 30, Biogazelle. All rights reserved. 1
2 Acknowledgements (A>Z) Carolina Fierro Manuel Luypaert Nele Nijs Pieter Mestdagh Sandra Steyaert Thomas Piofczyk Scott Kuersten Gary Schroth David Creytens Anneleen Decock Olivier De Wever Bert Dhondt An Hendrix Pieter Mestdagh Piet Ost Annouck Philippron Isabelle Rottiers Jo Van Dorpe Joni Van der Meulen Glen Vergauwen Kimberly Verniers Ken Op de Beeck Patrick Pauwels Marc Peeters Laure Sorber 2017 Biogazelle. All rights reserved. 2
3 RNA centric biotech company biomarker development disease characterization drug mode of action sequencing all types of RNA in tissue and fluids qpcr and dpcr assay design and validation antisense against lncrnas in cancer specialty lab services in the field of clinical trials or in routine diagnostics ISO17025 / GCLP 2017 Biogazelle. All rights reserved. 3
4 Liquid biopsies at Biogazelle digital PCR CNV/mutations microrna sequencing mrna/lncrna sequencing 2017 Biogazelle. All rights reserved. 4
5 Unmet needs in oncology more effective and less toxic treatments for durable responses combination therapies companion diagnostic tests > the right drug for the right patient better laboratory tests early diagnosis monitoring of treatment effectivity early detection of relapse or recurrence 2017 Biogazelle. All rights reserved. 5
6 Liquid biopsies are the holy grail of precision oncology easy to obtain low risk for the patient serial profiling > longitudinal studies reflects entire tumor load full of biomarker potential cell-free nucleic acids (DNA & RNA) circulating tumor cells extracellular vesicles tumor educated platelets 2017 Biogazelle. All rights reserved. 6
7 Active secretion and passive release of RNA into circulation vesicles exosomes, microvesicles, apoptotic bodies ribonucleoprotein complexes AGO2, high-density lipoproteins platelets intercellular communication biomarker potential abundance levels structural information (fusion, mutation, ) Wan et al., Nature Reviews Cancer, Biogazelle. All rights reserved. 7
8 Challenges in mrna sequencing (of clinical samples) fragmented/degraded RNA abundant unwanted RNA (ribosomal, hemoglobin) low input (0.2 ml liquid biopsy, 1 FFPE scroll, fine needle biopsy,) sense / antisense overlapping transcripts solution: probe based cdna enrichment, RNA capture sequencing 2017 Biogazelle. All rights reserved. 8
9 RNA capture sequencing history Levin, 2009 Ueno, 2012 Mercer, 2012 Halvardson, 2013 Cabanski, 2014 Biogazelle 467 genes 913 genes 2265 loci, 0.77 Mb exome exome on FFPE exome on plasma higher sensitivity higher transcriptome complexity fusion genes, variants 2017 Biogazelle. All rights reserved. 9
10 mrna capture sequencing fragmented RNA random primed ds cdna adaptor ligation PCR 2x capture PCR cleanup & quant 3 days of work; optimized conditions 21,415 mrnas 214,000 exons 425,000 probes 20M reads FFPE, 15M reads plasma +200 cases so far colon, lung, ovarium, breast, esophageal, pancreas custom probe set (452,000) for 52,000 human long non-coding RNAs 2017 Biogazelle. All rights reserved. 10
11 Colon & lung cancer samples sensitivity detected genes matching tumor FFPE, plasma and serum (n=2) detected genes with FPKM>=1 FFPE > 12,000 genes plasma > 8500 genes serum > 7500 genes 2017 Biogazelle. All rights reserved. 11
12 Colon & lung cancer samples strandedness, read distribution, coverage >99% strandedness coding regions enriched whole transcripts are covered (excl. UTR) 2017 Biogazelle. All rights reserved. 12
13 GAS5 lncrna sashimi plot in plasma 2017 Biogazelle. All rights reserved. 13
14 Colon & lung cancer samples reproducibility high reproducibility in plasma low abundant genes more variable in serum 2017 Biogazelle. All rights reserved. 14
15 Colon vs lung cancer plasma top 5 enriched significant pathways upon GSEA PI3K-AKT signaling pathway cell cycle osteoclast differentiation oxidative phosphorylation focal adhesion 2017 Biogazelle. All rights reserved. 15
16 Esophageal cancer plasma titration experimental design platelet-free / platelet-poor plasma cancer male : 100% 50% cancer 10% cancer 2x replicates for each sample 2% cancer healthy female : 0% FFPE from cancer tissue : 1x 2017 Biogazelle. All rights reserved. 16
17 Platelet-poor plasma (PPP) shows best reproducibility 0% cancer 2% cancer 10% cancer 50% cancer 100% cancer PFP PPP 2017 Biogazelle. All rights reserved. 17
18 Titration series to determine consistency of RNA abundance signal if healthy > cancer then 0 > 2 > 10 > 50 > 100 if cancer > healthy then 100 > 50 > 10 > 2 > 0 bin the fold-changes healthy vs. cancer determine fraction per bin that is titrating showing correct order 100% cancer 50% cancer 10% cancer 2% cancer healthy : 0% 2017 Biogazelle. All rights reserved. 18
19 Excellent titration response 25% lower expression is detected in 80% of the cases platelet-free platelet-poor titrating gene fraction titrating gene fraction 2017 Biogazelle. All rights reserved. 19
20 Ovarian cancer longitudinal study experimental design platelet-free plasma diagnosis before treatment during treatment post-surgery relapse FFPE tumor patient patient Biogazelle. All rights reserved. 20
21 Plasma samples tend to cluster by time point cluster dendogram during treatment before treatment patient 15: relapse 2017 Biogazelle. All rights reserved. 21
22 Plasma samples tend to cluster by time point samples after 1st chemotherapy cycle stand out hemolytic sample 2017 Biogazelle. All rights reserved. 22
23 Changes upon 1 st chemo treatment GSEA : lysome, lipid metabolism, ECM-receptor lysosome glycerophospholipid metabolism alpha-linolenic acid metabolism linoleic acid metabolism ether lipid metabolism ECM-receptor interaction not clear yet what these changes effectively mean intriguing and first time that mrna profiles in plasma provide insights 2017 Biogazelle. All rights reserved. 23
24 RNA seq variant calling pipeline (paired-end) RNA sequencing basecalling, demultiplexing, QC, trimming, adaptor removal raw RNA seq reads (FASTQ) map to reference STAR 2-pass alignment (BAM) remove duplicate reads & sort fusion detection FusionCatcher analysis-ready reads raw variants (VCF) SNVs variant calling reads mpileup VarScan InDels variant filtering (strand bias, base quality, depth, allelic ratio, ) filtered variants SNVs InDels variant annotation functional/genic annotation dbsnp/cosmic/civic RNAediting HGVS/SIFT-PolyPhen report annotated variants (VCF & CSV) SNVs InDels further evaluation, candidate selection, troubleshooting, 2017 Biogazelle. All rights reserved. 24
25 Testing of the RNA seq variant pipeline HCC1143 DNA exome sequencing vs polya+ RNA sequencing variant positions covered > 4 reads good concordance , mono-allelic expression low coverage RNA editing low coverage 2017 Biogazelle. All rights reserved. 25
26 Testing of the RNA seq variant pipeline 16 matched tumor / normal FFPE from diagnostic cases with known mutation 15/16 correctly called myxoid liposarcoma: FUS-DDIT3 fusion rhabdomyosarcoma: FOXO1-PAX3 fusion synovial sarcoma: SS18-SSX2 fusion Ewing sarcoma: ESWR1-FLI1 fusion colon cancer: KRAS SNV (n=2) melanoma: BRAF SNV (n=2) lung cancer: EGFR SNV + EGFR deletion of 15 bp GIST: PDGFRA SNV + KIT deletion of 21 bp 2017 Biogazelle. All rights reserved. 26
27 RNA editing event variant present in colon cancer FFPE RNA and plasma RNA, not in FFPE DNA 2017 Biogazelle. All rights reserved. 27
28 Therapy response monitoring FCGR2A mutation present in FFPE and plasma at diagnosis disappears during treatment and pops up again at time point 4 -> sign of relapse? Biogazelle. All rights reserved. 28
29 Colon cancer longitudinal study platelet-free/poor plasma metastatic setting (anti-vegf, anti-egfr, chemo) diagnosis before treatment 2 weeks after start treatment 1st CT scan 1 month after CT scan 2 months after CT scan patient G patient H patient J 2017 Biogazelle. All rights reserved. 29
30 Colon cancer longitudinal study large fold changes (CT scan vs diagnosis) POLB is the most upregulated gene involved in mismatch repair upregulated upon chemotherapy mutated in colon cancer 2017 Biogazelle. All rights reserved. 30
31 Colon cancer longitudinal study large fold changes (CT scan vs diagnosis) pathway enrichment (CT scan vs 1 st treatment) 2017 Biogazelle. All rights reserved. 31
32 Colon cancer longitudinal study gene set enrichment analysis DNA mismatch repair (anti-)proliferation T-cell stimulation inflammatory response t2 t3 t Biogazelle. All rights reserved. 32
33 Conclusions high level RNA is a fascinating molecule with a lot of biomarker potential liquid biopsies are emerging as holy grail for precision medicine novel application of mrna capture sequencing in body fluids 2017 Biogazelle. All rights reserved. 33
34 Conclusions - details platelet rich > platelet poor > platelet free plasma > serum gene expression: ~10,000 genes reproducibly detected variants: ~5-10,000 detected PCR duplicates require attention in variant calling larger plasma volumes, other extraction kits, adaptor ligation, robust plasma SOP many biological questions remain function circulating RNA, where does it come from, different cargo in different plasma fractions (RNP, EV, platelet) 2017 Biogazelle. All rights reserved. 34
35 Biogazelle. All rights reserved. 35
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