Lecture: NGS at the National Genomics Infrastructure
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The document outlines the services and capabilities of the National Genomics Infrastructure (NGI) in Stockholm, Sweden, focused on next-generation sequencing (NGS) technologies and bioinformatics support for researchers. It includes details on various sequencing methods, project timelines, applications, and organizational structure, alongside a summary of projects completed in 2017. NGI aims to provide state-of-the-art infrastructure and guidance for sequencing and bioinformatics, enhancing research capabilities across Sweden.
Lecture: NGS at the National Genomics Infrastructure
- 1. NGI stockholm NGI Sweden Next Generation Sequencing at the National Genomics Infrastructure Phil Ewels phil.ewels@scilifelab.se Introduction to Bioinformatics Using NGS Data Linköping, 2018-05-23
- 2. NGI stockholm Overview National Genomics Infrastructure Sequencing Technologies Sequencing Applications Bioinformatics at the NGI
- 4. NGI stockholm National Genomics Infrastructure Proteomics Metabolomics Single-Cell Biology Cellular & Molecular Imaging Molecular Structure Chemical Biology Genome Engineering Diagnostic Development Drug Discovery & Development NationalBioinformaticsInfrastructure DataOffice SciLifeLab NGI Technology Platforms Research Programs National Genomics Infrastructure
- 5. NGI stockholm SciLifeLab NGI Stockholm Uppsala Genomics Production SNP&Seq Uppsala Genome CenterGenomics Applications DevelopmentGenomics Applications Development National Genomics Infrastructure
- 6. NGI stockholm SciLifeLab NGI Our mission is to offer a state-of-the-art infrastructure for massively parallel DNA sequencing and SNP genotyping, available to researchers all over Sweden
- 7. NGI stockholm SciLifeLab NGI National resource State-of-the-art infrastructure Guidelines and support We provide guidelines and support for sample collection, study design, protocol selection and bioinformatics analysis
- 8. NGI stockholm NGI Organisation NGI Stockholm NGI Uppsala
- 9. NGI stockholm NGI Organisation Funding Staff salaries Premises and service contracts Capital equipment Host universities SciLifeLab VR KAW User fees Reagent costs NGI Stockholm NGI Uppsala
- 10. NGI stockholm Project timeline Sample QC Library preparation, Sequencing, Genotyping Data processing and primary analysis Scientific support and project consultation Data delivery
- 11. NGI stockholm Project timeline Sample QC Library preparation, Sequencing, Genotyping Data processing and primary analysis Scientific support and project consultation Data delivery
- 12. NGI stockholm Just Sequencing Methods offered at NGI FFPE Sequencing 10X Genomics Nanoporesequencing ATAC-seq UserQC (cheap preps) Hi-C(ox)Bisulphite sequencing RAD-seq RNA de novoDNA Data analysis pipelines included
- 13. NGI stockholm NGI Stockholm NGI Stockholm Projects in 2017 RNA-Seq WG Re-Seq De-Novo Metagenomics Targeted Re-Seq ChIP-Seq Epigenetics RAD Seq 0 45 90 135 180 1 13 15 31 58 61 159 177 • RNA-seq is the most common project type
- 14. NGI stockholm NGI Stockholm • RNA-seq is the most common project type • In total, NGI Sweden processed 1068 NGS projects with almost 50 000 samples in 2017 NGI Stockholm Samples in 2017 RNA-Seq WG Re-Seq De-Novo Metagenomics Targeted Re-Seq ChIP-Seq Epigenetics RAD Seq 0 4000 8000 12000 16000 192 180 397 5,909 4,496 211 4,551 15,022
- 15. NGI stockholm NGI Stockholm • Median turn around times from QC passed to data delivered for 2017 • Sequencing only: 11.5 days • RNA: 6.5 weeks • WGS: 8 weeks https://ngisweden.scilifelab.se/ file/stockholm_dashboard
- 17. NGI stockholm Sequencing Types Illumina PacBio Oxford Nanopore Ion Torrent
- 19. NGI stockholm Illumina Sequencing • Largest provider of sequencing technology • NGS machines use "Sequencing-by-synthesis" • Developed at the University of Cambridge in 1990s • Spun into a company called Solexa in 1998 • Solexa acquired by illumina in 2007 • Responsible for vast majority of DNA sequencing experiments worldwide
- 21. NGI stockholm Illumina iSeq 100
- 22. NGI stockholm Illumina MiniSeq 100
- 25. NGI stockholm Illumina HiSeq 2500
- 26. NGI stockholm Illumina HiSeq 3000
- 27. NGI stockholm Illumina HiSeq 4000
- 29. NGI stockholm Illumina NovaSeq 6000
- 30. NGI stockholm Illumina at NGI iSeq 100 Coming soon to NGI Uppsala Small cheap runs MiSeq Small runs, long reads (2x300bp) HiSeq 2500 Primary machine for most of NGI's history HiSeq X Cheap, high throughput Only allowed to run WGS with > 15X coverage NovaSeq 6000 Newest machine, both Stockholm & Uppsala Will eventually replace HiSeq 2500
- 31. NGI stockholm How to choose • Number of reads required • How many samples, how deeply sequenced? • Type of reads required • Single End / Paired End, length? • Urgency and cost • Sharing flow cells with other users • Best price for the project
- 32. NGI stockholm Patterned flow cells • New type of flow cell • HiSeq 4000, HiSeq X, NovaSeq • Single sequence per well • Higher density, more data • What's index-hopping? • ExAmp can mix up index pairs in tiny fraction of reads • Avoided with dual unique indexes
- 33. Patterned flow cells • Patterned flow cells can give "optical duplicates" • https://sequencing.qcfail.com/articles/illumina-patterned-flow- cells-generate-duplicated-sequences/ • Can be treated like regular PCR duplicates HiSeq 2500 HiSeq 4000
- 34. NGI stockholm Two colour chemistry • Older SBS used four different fluorophores • One for each nucleotide • New machines use two • Faster and cheaper • NextSeq, NovaSeq, iSeq • No signal = G • Can get poly-G if something goes wrong https://sequencing.qcfail.com/articles/illumina-2-colour- chemistry-can-overcall-high-confidence-g-bases/
- 36. NGI stockholm PacBio • Pacific Biosciences - specialists in long reads • Also uses fluorescent nucleotides • Polymerases immobilised at the bottom of tiny wells give off pulses as the nucleotides are incorporated • Each well is independent, doesn't use sequencing rounds like illumina • Can work with much longer DNA fragments • 250 bp – 60 kb (max ~160 kb)
- 38. NGI stockholm PacBio RS II
- 40. NGI stockholm PacBio Sequencing • Long reads are excellent for de-novo genome assembly and isoform detection • Output is expensive compared to illumina, but getting better • Small genomes are no problem. Larger genomes are now becoming more feasible. • New amplification-free enrichment using CRISPR-Cas9
- 42. NGI stockholm Oxford Nanopore • Newest contender in the sequencing world • Lots of hype and taken several years to become a reality • Still developing very fast • Quality, yield and cost changing almost monthly • High error rates (but better than they used to be) • Now 2-13% depending on sequencing type
- 48. NGI stockholm SmidgION (not yet released)
- 49. NGI stockholm Oxford Nanopore • The best technology available for ultra long reads • Twitter users report getting reads over 1 Mbp long • "Whale spotting" - finding the longest reads on the end of the distribution curve • Price dropping rapidly, but still expensive compared to illumina • NGI has 2x MinIONs, hoping for PromethION soon
- 51. NGI stockholm Ion Torrent • Main application • Microbial and metagenomic sequencing • Targeted re-sequencing (gene panels) • Clinical sequencing • Short, single-end reads • Fast run times
- 52. NGI stockholm Ion Torrent PGM • Yield • 0.1 - 1 Gbp • Run time • 3 hrs • Read length • 200 - 400 bp
- 53. NGI stockholm Ion Torrent Proton • Yield • 10 Gbp • Run time • 4 hrs • Read length • 200 bp
- 54. NGI stockholm Ion Torrent S5 XL • Yield • 1-13 Gbp • Run time • 3 hrs • Read length • 200 - 600 bp
- 55. NGI stockholm Sequencing Type • No need to remember all of this • Many considerations, changing all the time • We are experts - come and speak to us! support@ngisweden.se https://ngisweden.scilifelab.se/
- 57. NGI stockholm Library Preparation • All high throughput sequencing requires some kind of library preparation • Add adapters for sequencing chemistry • Adjust DNA fragment lengths • Incorporate biological signal into sequence • Add required enzymes • Different library preps enable different applications
- 58. NGI stockholm RNA Sequencing • Choose a type of RNA • Protein coding mRNA (poly-A) • All RNA (rRNA depletion) • Small RNA • Choose your question • Differential gene expression • Differential isoform detection & quantification • Fusion gene detection • Define your limitations • Low-input material • Low quality material (eg. FFPE)
- 59. NGI stockholm RNA Sequencing • Illumina sequencing RNA library prep kits • Illumina TruSeq RNA • Illumina RiboZero • Illumina TruSeq RNA Exome • Clontech SMARTER Pico • Illumina TruSeq Small RNA • Oxford Nanopore, PacBio, IonTorrent Protein-coding poly-A rRNA depletion FFPE / low quality low input small RNA
- 60. NGI stockholm DNA Sequencing • Choose your question • SNP, SNV, indel calling • Structural variant detection • De-novo genome assembly • Choose your priorities • Sequencing accuracy • Sequencing depth • Ultra-long reads • Define your requirements • Low-input material • Low quality material (eg. FFPE)
- 61. NGI stockholm DNA Sequencing • Illumina sequencing DNA library prep kits • Illumina TruSeq DNA PCR Free • Rubicon ThruPLEX • Illumina Nextera XT • Illumina Nextera Flex • 10X Genomics • Oxford Nanopore, PacBio, IonTorrent Best quality Low input Cheap (plate format) Fast and simple Linked reads
- 62. NGI stockholm 10X Genomics • Chromium instrument uses droplet emulsion technology for nanoliter reaction volumes • Linked-read sequencing • Large molecules fragmented in droplets and barcoded • Normal short-read illumina sequencing used • Long fragments (20-100+ Kbp) reassembled from barcodes • Regular illumina sequencing libraries produced
- 64. NGI stockholm 10X Genomics • Single cell RNA sequencing • Thousands of cells captured in droplets • Each RNA molecule tagged with droplet barcode
- 65. NGI stockholm • Now testing Hi-C in NGI Stockholm • Proximity ligation assay to detect physical colocation of DNA fragments within cell nuclei • Multiple applications for data • Epigenetics • De-novo genome assembly • Structural variation detection Hi-C Chr 14 Chr14
- 66. NGI stockholm Methylation Sequencing • Bisulphite sequencing detects Cytosine methylation in genomic DNA • Unmethylated Cs converted to Uracil by bisulfites and sequenced as T • Methylated Cs are protected and sequenced as C • Oxidative bisulphite informs about hydroxy-methylation • Current under development at NGI Stockholm • PacBio and Oxford Nanopore able to detect some native base modifications
- 67. NGI stockholm RAD Sequencing • Restriction-site Associated DNA sequencing, also known as GBS (Genotyping By Sequencing) • Genome fragmented using a restriction enzyme • Narrow size range purified - same regions of genome for all individuals • Allows cheap high-depth variant calling for large numbers of samples, without a reference genome • Excellent for population genomics and ecology
- 69. NGI stockholm Bioinformatics at NGI • Raw sequencing data management • Demultiplexing, data transfers, backups, delivery • Quality control • Every project is checked against quality criteria • Automated analysis pipelines • Standardised pipelines give reproducible results • Software development
- 70. NGI stockholm NGI Data Handling Sequencer Network storage Preprocessing Backup UPPMAX (Irma) UPPMAX (Grus) SNIC Supr Authentication Your computer Your analysis server
- 71. NGI stockholm Grus Deliveries • UPPMAX tool for NGI data deliveries • NGI creates a SNIC Supr "delivery project" for each NGI sequencing project • Project PI and contact person given access, according to what was put on the order form • Email sent with project ID and instructions • Grus is for secure short term storage only • Requires two-factor authentication
- 72. NGI stockholm Analysis Pipelines • Initial data analysis for major protocols • Internal QC and standardised starting point for users • All software open source and on GitHub • http://opensource.scilifelab.se/ • http://github.com/SciLifeLab/ • Accredited facility
- 73. NGI stockholm Analysis Requirements Automated Reliable Easy for others to run Reproducible results
- 74. NGI stockholm Analysis Pipelines NouGAT (de-novo)
- 75. Sarek Somatic • SNPs, SNVs and indels • Structural variants • Heterogeneity, ploidy and CNVs • Germline and/or Somatic analysis • Formerly called Cancer Analysis Workflow https://github.com/SciLifeLab/Sarek MuTect2 Strelka FreeBayes GATK HaplotypeCaller MuTect1 ASCAT Manta • Tumour/Normal pair WGS analysis based on GATK best practices
- 76. Sarek • Tool split into sub-workflows • Bash wrapper script runs whole workflow • Manuscript submitted this week, preprint available on bioRxiv • https://www.biorxiv.org/content/early/ 2018/05/09/316976
- 77. NGI-RNAseq NGI, April – December 2017 10,227samples processed 131user projects https://github.com/SciLifeLab/NGI-RNAseq MIT Licence Read alignment Gene counts Quality Control Reporting Raw data
- 78. NGI-RNAseq Quantitative Biology Center Tübingen, Germany https://github.com/SciLifeLab/NGI-RNAseq Now running using
- 79. NGI stockholm nf-core • A community effort to collect a curated set of Nextflow analysis pipelines • GitHub organisation to collect pipelines in one place • No institute-specific branding • Strict set of guideline requirements • Automated testing for code style and function https://nf-co.re
- 80. NGI stockholm nf-core https://nf-co.re • Easy to run pipelines • Helpful community • Super reproducible results
- 81. NGI stockholm Quality Control • Every project has some level of quality control checks • Sequencing quality • FastQC, FastQ Screen • Analysis pipelines give application-specific QC • Qualimap, RSeQC • Reporting is done using MultiQC
- 82. MultiQC • Reporting tool, parses logs from completed analysis • Creates single HTML report for all samples & steps in a project • Interactive plots for data exploration • Current version now has 61 supported tools • Works with anything from tens → thousands of samples • Highly customisable
- 85. Conclusions
- 86. NGI stockholm If you have a project • Visit our order portal • Create projects • Request meetings • Send us an email https://ngisweden.scilifelab.se support@ngisweden.se
- 87. NGI stockholm Find our tools • View our open-source software • All code available on GitHub http://opensource.scilifelab.se
- 88. Acknowledgements NGI stockholm Thanks to: Max Käller Olga Vinnere Pettersson NGI Sweden Phil Ewels phil.ewels@scilifelab.se ewels tallphil support@ngisweden.se http://ngisweden.scilifelab.se http://opensource.scilifelab.se