Applications of Next Generation Sequencing in Metagenomics Studies
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1 Applications of Next Generation Sequencing in Metagenomics Studies Francesca Rizzo, PhD Genomix4life Laboratory of Molecular Medicine and Genomics Department of Medicine and Surgery University of Salerno
2 Genome = Parts list of a single genome Introduction Human genome: 3 Gbp, 24,000 ORFs Bacterial Genome: 3-5 Mbp, ORFs Viral Genome: 0.1-1Mbp, ORFs e.g.: Garden soil 50 archeal species: 1.5x10 8 bp 1000 bacterial species: 5.0x10 9 bp 200 fungal species: 1.0x10 11 bp 50 invertebrate species: 5.0x10 10 bp 5000 viral genomes: 5.0x10 7 bp...functional analysis of the collective genomes of soil microflora, which we term the metagenome of the soil. - J. Handelsman et al., 1998 Metagenome = Parts list of the community 160 Gb DNA
3 Introduction "the application of modern genomics techniques to the study of communities of microbial organisms directly in their natural environments, bypassing the need for isolation and lab cultivation of individual species Chen, K.; Pachter, L. (2005) Comput. Biol. PubMed: metagenom*[title/abstract]
4 Introduction "the application of modern genomics techniques to the study of communities of microbial organisms directly in their natural environments, bypassing the need for isolation and lab cultivation of individual species Chen, K.; Pachter, L. (2005) Comput. Biol. PubMed: metagenom*[title/abstract]
5 Next Generation 3 rd Generation First Generation
6 Metagenome timeline
7
8 Metagenomics Who is there? What are they doing?
9 NGS methods Marker Genes (Amplicon sequencing) Extract DNA Amplify with targeted primers Diversity analysis Matagenomics (Shotgun sequencing) Extract DNA Sequence random fragments Diversity, function analysis Metatranscriptomics (RNA-sequencing) Extract RNA Sequence cdna Gene expression, function
10 NGS methods Marker Genes (Amplicon sequencing) Extract DNA Amplify with targeted primers Diversity analysis Matagenomics (Shotgun sequencing) Extract DNA Sequence random fragments Diversity, function analysis Metatranscriptomics (RNA-sequencing) Extract RNA Sequence cdna Gene expression, function
11 Marker Genes (Amplicon sequencing) 16S rrna Genes Bacteria Internal transcribed spacer (ITS) Fungi V4 V3 V6 V5 V7 V8 V1 V2 V9 Claesson, Marcus J., et al. Nucleic acids research (2010) D. Lee Taylor et al. Appl. Environ. Microbiol. 2016;82: Alternative gene markers reca: Response to DNA Stress in Bacteria 18S rrna: 18S ribosomal RNA rpob: RNA polymerase ß subunit hsp70: heat shock protein 70
12 Typical workflow Marker Genes (Amplicon sequencing) Extract DNA Library preparation Environmental sample DNA
13 Typical workflow Marker Genes (Amplicon sequencing) Extract DNA Library preparation Environmental sample DNA
14 Typical workflow Marker Genes (Amplicon sequencing) Extract DNA Library preparation Environmental sample DNA Sequencing PLATFORM: Illumina MiSeq (2X150 bp, 2X250 bp, 2X300 bp) Read 1: 300 bp Index 2 Analysis Index 1 Read 2: 300 bp DEPTH OF SAMPLING: reads/sample for simple communities reads/sample for complex metagenomes
15 Typical workflow Marker Genes (Amplicon sequencing) Who is there? Barcodes are used to assign each sequence to the sample it come from, dropping low quality reads. Adapter are trimmed and multiple sequence alignment based on reference sequences is built. Phylogenetic tree is built using representative OTU. Quantitative assessment of the community 30 % 15 % 5% 10 % 40 % Use community clustering techniques to relates samples to one another Related sequences are grouped into OTUs and taxonomy is assigned OTU (Operational Taxonomic Unit)
16 Marker Genes (Amplicon sequencing) ADVANTAGE: -Fast survey of large community -Reduced cost -Mature set of tools and statistics for analysis -Good for first round surveys DISADVANTAGE: -Lack of tools for processing ITS/fungal microbiome data set -Amplification bias affect accuracy and replication -16S or ITS may not differentiate between similar strains -Different target regions in 16S gene and ITS region can give different results/resolution -Chloroplast 16S sequences can get amplified in plant metagenomes
17 NGS methods Marker Genes (Amplicon sequencing) Extract DNA Amplify with targeted primers Diversity analysis Matagenomics (Shotgun sequencing) Extract DNA Sequence random fragments Diversity, function analysis Metatranscriptomics (RNA-sequencing) Extract RNA Sequence cdna Gene expression, function
18 Typical workflow Matagenomics (Shotgun sequencing) Extract DNA DNA fragmentation Environmental sample DNA Library preparation End repair 3 End adenylation Adapter ligation PCR
19 Typical workflow Matagenomics (Shotgun sequencing) Extract DNA DNA fragmentation Environmental sample DNA Library preparation End repair Sequencing 3 End adenylation Adapter ligation PCR PLATFORM: Illumina NextSeq (2X150 bp), Hiseq X (2X125bp) Read 1: 150 bp Index 1 Analysis Index 2 DEPTH OF SAMPLING: reads/sample Read 2: 150 bp Number of specie? Relative abundance of the species? Known o unknown genomes?
20 Typical workflow Matagenomics (Shotgun sequencing) Genome A Genome B Genome C Who is there? What are they doing? What can they do? Barcodes are used to assign each sequence to the sample it come from, dropping low quality reads. Taxonomic classification Genome D Unknown Metagemomes alignment to reference genome and/or de novo assembling. Function analysis Gene prediction and/or annotation Protein family Gene/genome structure Metabolic pathways Gene ontology
21 NGS methods Marker Genes (Amplicon sequencing) Extract DNA Amplify with targeted primers Diversity analysis Matagenomics (Shotgun sequencing) Extract DNA Sequence random fragments Diversity, function analysis Metatranscriptomics (RNA-sequencing) Extract RNA Sequence cdna Gene expression, function
22 Introduction Genome = Parts list of a single genome Metagenome = Parts list of the community Human genome: 3 Gbp, 24,000 ORFs Bacterial Genome: 3-5 Mbp, ORFs Viral Genome: 0.1-1Mbp, ORFs e.g.: Garden soil 50 archeal species: 1.5x10 8 bp 1000 bacterial species: 5.0x10 9 bp 200 fungal species: 1.0x10 11 bp 50 invertebrate species: 5.0x10 10 bp 5000 viral genomes: 5.0x10 7 bp 160 Gb DNA 8 Gb RNA
23 Typical workflow Metatranscriptomics (RNA-sequencing) Extract RNA rrna depletion Environmental sample (Optional) Library preparation
24 Typical workflow Metatranscriptomics (RNA-sequencing) Extract RNA rrna depletion Environmental sample (Optional) RNA fragmented and primed Library preparation First strand cdna synthesis Second strand cdna synthesis 3 End adenylation Adapter ligation PCR
25 Typical workflow Metatranscriptomics (RNA-sequencing) Extract RNA rrna depletion Environmental sample Sequencing (Optional) Library preparation RNA fragmented and primed First strand cdna synthesis Second strand cdna synthesis 3 End adenylation PLATFORM: Illumina NextSeq (2X150 bp), Hiseq X (2X125bp) Read 1: 150 bp Index 1 Analysis Adapter ligation PCR Index 2 Read 2: 150 bp DEPTH OF SAMPLING: reads/sample Number of specie? Relative abundance of the species? Known o unknown genomes? Levels of gene expression?
26 Typical workflow Metatranscriptomics (RNA-sequencing) Gene 1 Gene 2 Gene 3 Gene 1 Gene 2 Gene 3 Gene 1 Gene 2 Gene 3 Specie A Specie B Specie C Who is there? What are they doing? Protein family profile Barcodes are used to assign each sequence to the sample it come from, dropping low quality reads. Function analysis Gene 1 Gene 2 Gene 3 Alignment to reference transcriptome and/or de novo assembling. Specie D Unknown Taxonomic classification New molecules identification Gene ontology abundance Metabolic pathways reconstruction Pathways inference and enrichment analysis
27 Who is there What are they doing?
28 WHY? Metagenomics Discovery of: the diversity of life what is a genome/species the interplay between human and microbes how do microbial communities work and how stable are novel metabolic pathways novel natural products new antibiotic new molecules with new functions new enzymes and bioactive molecules
29 Our Team Our Services Contacts: Biomarkers Next Generation Sequencing Prof. Alessandro Dott.ssa Giovanna Weisz Marchese Dott. Giorgio Giurato Dott.ssa Rizzo Francesca Prof. Roberto Parente Dott.ssa Roberta Tarallo Fondazione dell Università degli Studi di Salerno Dott.ssa Teresa Rocco Dott.ssa Maria Ravo Dott.ssa Angela Cordella Dott. Giovanni Nassa Microarray QYAsynphony Liquid handling Ion PGM Bioinformatics Available Technologies NextSeq 500 MiSeq Research Service Server 40 Tb HiSeq 2500 Server 400 Tb NEXT GENERATION SEQUENCING DNA Whole genome & Exome sequencing targeted resequencing - de novo sequencing RNA RNA-Seq smallrna-seq - RIP-Seq CAGE Epigenomics and Gene regulation ChIP-Seq - BS-Seq targeted BS-Seq - methyl- Seq Metagenomics and metatrascriptomics Amplicon-Seq Shotgun-Seq Single cell sequencing MICROARRAY Genotyping Infinium HD - Vera Code Golden Gate Genotyping Epigenetics Human MethylationEPIC BeadChip Nutrigenomics
30 Applications of Next Generation Sequencing in Metagenomics Studies Francesca Rizzo, PhD Genomix4life Laboratory of Molecular Medicine and Genomics Department of Medicine and Surgery University of Salerno
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