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Keywords: Exploratory-analysis  or metagenomics  or Roslin Institute  or Introduction bioinformatics 


A Critical Guide to the PDB

This Critical Guide in the Introduction to Bioinformatics series provides a brief outline of the Protein Data Bank – the PDB – the world’s primary repository of biological macromolecular structures. The rationale for creating the resource and the kinds of information it provides are discussed,...

Scientific topics: Database management

Keywords: Introduction bioinformatics, Introduction pdb, Protein structure analysis, Protein structure databases, Protein structures

A Critical Guide to the PDB https://tess.elixir-europe.org/materials/a-critical-guide-to-the-pdb This Critical Guide in the Introduction to Bioinformatics series provides a brief outline of the Protein Data Bank – the PDB – the world’s primary repository of biological macromolecular structures. The rationale for creating the resource and the kinds of information it provides are discussed, and issues relating to its evolution and growth are explored. Specifically, this Guide introduces the principal features of the PDB, the nature (and quality) of its contents and how these may be interrogated. On reading this Guide, users will be able to: i) explain some of the ways in which knowledge of protein structures is useful; ii) identify the constituent databases of the wwPDB; iii) explain key features of the RCSB PDB in terms of its data distribution, growth and redundancy statistics; iv) search the PDB using simple and advanced keywords and full sequences, and analyse differences between them; and v) explain various structural quality criteria, and infer the quality of individual PDB entries. Database management Introduction bioinformatics, Introduction pdb, Protein structure analysis, Protein structure databases, Protein structures Beginners 2018-09-08
A Critical Guide to InterPro

This Critical Guide in the Introduction to Bioinformatics series provides an introduction to the InterPro database, the largest, most comprehensive, integrated protein family database in the world. The rationale for creating the resource, the nature of its contributing databases and the kinds of...

Scientific topics: Database management

Keywords: Introduction bioinformatics, Introduction interpro, Protein family classification, Protein family databases, Protein family hierarchies, Protein function annotation, Protein sequence analysis

A Critical Guide to InterPro https://tess.elixir-europe.org/materials/a-critical-guide-to-interpro This Critical Guide in the Introduction to Bioinformatics series provides an introduction to the InterPro database, the largest, most comprehensive, integrated protein family database in the world. The rationale for creating the resource, the nature of its contributing databases and the kinds of information they provide are discussed, and the role of InterPro in protein classification and function-annotation projects is outlined. Specifically, this Guide introduces the principal components of the InterPro database, the differences between them, and how their integration creates a resource whose diagnostic power is greater than the sum of its parts. On reading this Guide, users will be able to: i) explain how protein family databases are used to help annotate uncharacterised protein sequences; ii) identify InterPro’s constituent data resources and explain the main methods that underpin them; iii) search InterPro using keywords and full sequences; iv) analyse and interpret search results in terms of protein family hierarchies, their structural domains and functional features; and v) track the provenance of InterPro’s annotations. Database management Introduction bioinformatics, Introduction interpro, Protein family classification, Protein family databases, Protein family hierarchies, Protein function annotation, Protein sequence analysis Beginners 2018-09-08
A Critical Guide to the UniProtKB Flat-file Format

This Critical Guide briefly presents the need for biological databases and for a standard format for storing and organising biological data. Web-based interfaces have made databases more user-friendly, but knowledge of the underlying file format offers a deeper understanding of how to navigate...

Scientific topics: Database management

Keywords: Flat file databases, Flat files, Introduction bioinformatics, Uniprotkb flat file format

A Critical Guide to the UniProtKB Flat-file Format https://tess.elixir-europe.org/materials/a-critical-guide-to-the-uniprotkb-flat-file-format This Critical Guide briefly presents the need for biological databases and for a standard format for storing and organising biological data. Web-based interfaces have made databases more user-friendly, but knowledge of the underlying file format offers a deeper understanding of how to navigate and mine the information they contain, so that humans and machines can get the most out of them. This Guide explores the file format that underpins one of today’s most popular protein sequence databases – UniProtKB. Specifically, this Guide introduces the concept of database ‘flat-files’, and examines features of the UniProtKB flat-file format. On reading this Guide, users will be able to: i) identify key fields within UniProtKB/Swiss-Prot and UniProtKB/TrEMBL flat-files; ii) explain what these fields mean, what information they contain and what the information is used for; iii) analyse the information in different fields and infer structural and functional features of a sequence; iv) examine and investigate the provenance of annotations; and v) compare annotations at different time-points and evaluate the likely impact of annotation changes. Database management Flat file databases, Flat files, Introduction bioinformatics, Uniprotkb flat file format Beginners 2018-09-08
A Critical Guide to UniProtKB

This Critical Guide in the Introduction to Bioinformatics series provides a brief outline of the UniProt protein sequence database, with a particular focus on the UniProt Knowledgebase – UniProtKB. The rationale for creating the resource, its contributing databases and the kinds of information...

Scientific topics: Database management

Keywords: Introduction bioinformatics, Introduction uniprot, Protein sequence databases, Uniprot knowledgebase

A Critical Guide to UniProtKB https://tess.elixir-europe.org/materials/a-critical-guide-to-uniprotkb This Critical Guide in the Introduction to Bioinformatics series provides a brief outline of the UniProt protein sequence database, with a particular focus on the UniProt Knowledgebase – UniProtKB. The rationale for creating the resource, its contributing databases and the kinds of information they provide are discussed, and issues behind the quality of their annotations are explored. Specifically, this Guide introduces the principal components of the UniProt Knowledgebase, and the differences between them. On reading this Guide, users will be able to: i) identify and explain the characteristic features of UniProtKB/Swiss-Prot and UniProtKB/TrEMBL entries; ii) distinguish annotations that are computed, and hence not experimentally validated; iii) search UniProtKB using keywords, full sequences and peptides, and interpret the results; iv) analyse and track the provenance of annotations; and v) infer which annotations are likely to be accurate and which erroneous. Database management Introduction bioinformatics, Introduction uniprot, Protein sequence databases, Uniprot knowledgebase Beginners 2018-09-08
A Critical Guide to BLAST

This Critical Guide in the Introduction to Bioinformatics series provides an overview of the BLAST similarity search tool, briefly examining the underlying algorithm and its rise to popularity. Several Web-based and stand-alone implementations are reviewed, and key features of typical search...

Keywords: Introduction bioinformatics, Introduction blast, Sequence database searching, Sequence similarity searching

A Critical Guide to BLAST https://tess.elixir-europe.org/materials/a-critical-guide-to-blast This Critical Guide in the Introduction to Bioinformatics series provides an overview of the BLAST similarity search tool, briefly examining the underlying algorithm and its rise to popularity. Several Web-based and stand-alone implementations are reviewed, and key features of typical search results are discussed. Specifically, this Guide introduces concepts and theories that underpin the BLAST search tool, and examines features of search outputs important for understanding and interpreting BLAST results. On reading this Guide, users will be able to: i) search a variety of Web-based sequence databases with different query sequences, and alter search parameters; ii) explain a range of typical search parameters, and the likely impacts on search outputs of changing them; iii) analyse the information conveyed in search outputs and infer the significance of reported matches; iv) examine and investigate the annotations of reported matches, and their provenance; and v) compare the outputs of different BLAST implementations and evaluate the implications of any differences. Introduction bioinformatics, Introduction blast, Sequence database searching, Sequence similarity searching Beginners 2018-09-08
A Critical Guide to Unix

This Critical Guide in the Introduction to Bioinformatics series briefly introduces the Unix Operating System, and provides a subset of some of the most helpful and commonly used commands, including those that allow various types of search, navigation and file manipulation. Several keystroke...

Keywords: Command line, Introduction bioinformatics, Introduction unix, Unix commands, Unix operating system

A Critical Guide to Unix https://tess.elixir-europe.org/materials/a-critical-guide-to-unix This Critical Guide in the Introduction to Bioinformatics series briefly introduces the Unix Operating System, and provides a subset of some of the most helpful and commonly used commands, including those that allow various types of search, navigation and file manipulation. Several keystroke short-cuts are also explained, which help to make the routine use of Unix commands more efficient. Specifically, this Guide showcases some of the simplest, most frequently used commands to help new users to understand and gain confidence in using the Unix Operating System. On reading the Guide, users will be able: i) to exploit a range of commands: to manipulate files, directories and processes; to navigate directory structures and explore their contents; to search for files, and search and compare file contents; and to direct command outputs into files or into other commands; and ii) to explain what many simple commands mean and how they’re used. Command line, Introduction bioinformatics, Introduction unix, Unix commands, Unix operating system Beginners 2018-09-08
Phylogenetics & Phylogeography (Advanced Analytical Methods)

Phylogenetics and Phylogeography(Advanced Analytical Methods) Lecture by Dr Sam Lycett, filmed at The Roslin Institute, March 2015.

Keywords: Phylogenetics, Roslin Institute

Phylogenetics & Phylogeography (Advanced Analytical Methods) https://tess.elixir-europe.org/materials/phylogenetics-phylogeography-advanced-analytical-methods Phylogenetics and Phylogeography(Advanced Analytical Methods) Lecture by Dr Sam Lycett, filmed at The Roslin Institute, March 2015. Phylogenetics, Roslin Institute
Molecular epidemiology practical

Practical session with Dr. Emily Richardson, filmed at The Roslin Institute, March 2015.

Keywords: Molecular epidemiology, Roslin Institute

Molecular epidemiology practical https://tess.elixir-europe.org/materials/molecular-epidemiology-practical Practical session with Dr. Emily Richardson, filmed at The Roslin Institute, March 2015. Molecular epidemiology, Roslin Institute
Phylogenetic analysis of pathogens: Staphylococcus aureus, host switching and antibiotic resistance

Lecture by professor Ross Fitzgerald, filmed at The Roslin Institute, March 2015.

Keywords: Phylogenetic analysis, Roslin Institute

Phylogenetic analysis of pathogens: Staphylococcus aureus, host switching and antibiotic resistance https://tess.elixir-europe.org/materials/phylogenetic-analysis-of-pathogens-staphylococcus-aureus-host-switching-and-antibiotic-resistance Lecture by professor Ross Fitzgerald, filmed at The Roslin Institute, March 2015. Phylogenetic analysis, Roslin Institute
Graphical & Computational Modelling of Biological Pathways

Lecture by professor Tom Freeman. Filmed at The Roslin Institute, The University of Edinburgh, March 2015

Keywords: Graphical modelling, Roslin Institute

Graphical & Computational Modelling of Biological Pathways https://tess.elixir-europe.org/materials/graphical-computational-modelling-of-biological-pathways-d0b38ce1-0e2e-4ba9-9e0c-39c6af558782 Lecture by professor Tom Freeman. Filmed at The Roslin Institute, The University of Edinburgh, March 2015 Graphical modelling, Roslin Institute
An Introduction to BioLayout Express3D

Lecture by professor Tom Freeman. Filmed during a half-day training course held at The Roslin Institute, January 2015, aimed at training biologists with little or no experience of gene expression analysis the basics. Features 15 short films covering the background to data generation through to...

Keywords: Gene expression analysis, Roslin Institute

An Introduction to BioLayout Express3D https://tess.elixir-europe.org/materials/an-introduction-to-biolayout-express3d Lecture by professor Tom Freeman. Filmed during a half-day training course held at The Roslin Institute, January 2015, aimed at training biologists with little or no experience of gene expression analysis the basics. Features 15 short films covering the background to data generation through to deriving meaning using network analysis. - Course aims: the basics of expression data analysis introduction to graph-based analysis introduction to BioLayout Express3D data import navigation of graphs clustering graph analysis data export Gene expression analysis, Roslin Institute
Phylogenetics & Phylogeography Practical (Advanced Analytical Methods)

Practical session with Dr Sam Lycett, filmed at The Roslin Institute, March 2015.

Keywords: Phylogenetics, Phylogeography, Roslin Institute

Phylogenetics & Phylogeography Practical (Advanced Analytical Methods) https://tess.elixir-europe.org/materials/phylogenetics-phylogeography-practical-advanced-analytical-methods Practical session with Dr Sam Lycett, filmed at The Roslin Institute, March 2015. Phylogenetics, Phylogeography, Roslin Institute
Graphical & Computational Modelling of Biological Pathways

Lecture by professor Tom Freeman. Filmed at The Roslin Institute, The University of Edinburgh, March 2015

Keywords: Graphical modelling, Computational modelling, Roslin Institute

Graphical & Computational Modelling of Biological Pathways https://tess.elixir-europe.org/materials/graphical-computational-modelling-of-biological-pathways Lecture by professor Tom Freeman. Filmed at The Roslin Institute, The University of Edinburgh, March 2015 Graphical modelling, Computational modelling, Roslin Institute
SAS Introduction

Training session with Dr Helen Brown, Senior Statistician, at The Roslin Institute, April 2015. These training sessions were given to staff and research students at the Roslin Institute. The material is also used for the Animal Biosciences MSc course taught at the Institute.

Keywords: SAS, Roslin Institute

SAS Introduction https://tess.elixir-europe.org/materials/sas-introduction Training session with Dr Helen Brown, Senior Statistician, at The Roslin Institute, April 2015. These training sessions were given to staff and research students at the Roslin Institute. The material is also used for the Animal Biosciences MSc course taught at the Institute. SAS, Roslin Institute
A Brief Introduction to R

A short training session with Dr. Ian Handel at The Roslin Institute, April 2015

Keywords: R language, Roslin Institute

A Brief Introduction to R https://tess.elixir-europe.org/materials/a-brief-introduction-to-r A short training session with Dr. Ian Handel at The Roslin Institute, April 2015 R language, Roslin Institute
Summarising Data

Training session with Dr Helen Brown, Senior Statistician, at The Roslin Institute, December 2015. These training sessions were given to staff and research students at the Roslin Institute. The material is also used for the Animal Biosciences MSc course taught at the Institute.

Keywords: Summarising data, Roslin Institute

Summarising Data https://tess.elixir-europe.org/materials/summarising-data Training session with Dr Helen Brown, Senior Statistician, at The Roslin Institute, December 2015. These training sessions were given to staff and research students at the Roslin Institute. The material is also used for the Animal Biosciences MSc course taught at the Institute. Summarising data, Roslin Institute
Basic Statistical Tests

Training session with Dr Helen Brown, Senior Statistician, at The Roslin Institute, December 2015. These training sessions were given to staff and research students at the Roslin Institute. The material is also used for the Animal Biosciences MSc course taught at the Institute.

Keywords: Statistical tests, Roslin Institute

Basic Statistical Tests https://tess.elixir-europe.org/materials/basic-statistical-tests Training session with Dr Helen Brown, Senior Statistician, at The Roslin Institute, December 2015. These training sessions were given to staff and research students at the Roslin Institute. The material is also used for the Animal Biosciences MSc course taught at the Institute. Statistical tests, Roslin Institute
Introduction to Experimental Design

Training session with Dr Helen Brown, Senior Statistician, at The Roslin Institute, January 2016. These training sessions were given to staff and research students at the Roslin Institute. The material is also used for the Animal Biosciences MSc course taught at the Institute.

Keywords: Experimental design, Roslin Institute

Introduction to Experimental Design https://tess.elixir-europe.org/materials/introduction-to-experimental-design Training session with Dr Helen Brown, Senior Statistician, at The Roslin Institute, January 2016. These training sessions were given to staff and research students at the Roslin Institute. The material is also used for the Animal Biosciences MSc course taught at the Institute. Experimental design, Roslin Institute
Introduction to Sample Size Calculation

Training session with Dr Helen Brown, Senior Statistician, at The Roslin Institute, January 2016. These training sessions were given to staff and research students at the Roslin Institute. The material is also used for the Animal Biosciences MSc course taught at the Institute. A spreadsheet...

Keywords: Sample size, Roslin Institute

Introduction to Sample Size Calculation https://tess.elixir-europe.org/materials/introduction-to-sample-size-calculation Training session with Dr Helen Brown, Senior Statistician, at The Roslin Institute, January 2016. These training sessions were given to staff and research students at the Roslin Institute. The material is also used for the Animal Biosciences MSc course taught at the Institute. A spreadsheet to carry out the calculations described in the presentation may be copied here: http://datashare.is.ed.ac.uk/handle/10283/1996 Sample size, Roslin Institute
Introduction to Statistical Modelling

Training session with Dr Helen Brown, Senior Statistician, at The Roslin Institute, December 2015. These training sessions were given to staff and research students at the Roslin Institute. The material is also used for the Animal Biosciences MSc course taught at the Institute.

Keywords: Statistical modelling, Roslin Institute

Introduction to Statistical Modelling https://tess.elixir-europe.org/materials/introduction-to-statistical-modelling Training session with Dr Helen Brown, Senior Statistician, at The Roslin Institute, December 2015. These training sessions were given to staff and research students at the Roslin Institute. The material is also used for the Animal Biosciences MSc course taught at the Institute. Statistical modelling, Roslin Institute
Introduction to Mixed Models

Training session with Dr Helen Brown, Senior Statistician, at The Roslin Institute, March 2016. These training sessions were given to staff and research students at the Roslin Institute. The material is also used for the Animal Biosciences MSc course taught at the Institute.

Keywords: Mixed models, Roslin Institute

Introduction to Mixed Models https://tess.elixir-europe.org/materials/introduction-to-mixed-models Training session with Dr Helen Brown, Senior Statistician, at The Roslin Institute, March 2016. These training sessions were given to staff and research students at the Roslin Institute. The material is also used for the Animal Biosciences MSc course taught at the Institute. Mixed models, Roslin Institute
Introduction to Analysing Repeated Measures Data

Training session with Dr Helen Brown, Senior Statistician, at The Roslin Institute, March 2016. These training sessions were given to staff and research students at the Roslin Institute. The material is also used for the Animal Biosciences MSc course taught at the Institute.

Keywords: Data analysis, Repeated measures, Roslin Institute

Introduction to Analysing Repeated Measures Data https://tess.elixir-europe.org/materials/introduction-to-analysing-repeated-measures-data Training session with Dr Helen Brown, Senior Statistician, at The Roslin Institute, March 2016. These training sessions were given to staff and research students at the Roslin Institute. The material is also used for the Animal Biosciences MSc course taught at the Institute. Data analysis, Repeated measures, Roslin Institute
Introduction to ChIP-Seq Using Galaxy: Analysing protein interactions with DNA

ChIP-sequencing, also known as ChIP-Seq, is a powerful technique for investigating protein interactions with DNA. This course will take you through an example ChIP-Seq analysis pipeline, following a published methodology to show how we can understand and reproduce these published results.

Scientific topics: ChIP-seq

Keywords: Roslin Institute

Introduction to ChIP-Seq Using Galaxy: Analysing protein interactions with DNA https://tess.elixir-europe.org/materials/introduction-to-chip-seq-using-galaxy-analysing-protein-interactions-with-dna ChIP-sequencing, also known as ChIP-Seq, is a powerful technique for investigating protein interactions with DNA. This course will take you through an example ChIP-Seq analysis pipeline, following a published methodology to show how we can understand and reproduce these published results. ChIP-seq Roslin Institute Any student, postdoc or RA who has an interest in bioinformatics and who intends to conduct ChIP-Seq analysis on a Galaxy platform.
Who is doing what on the cheese surface? Overview of the cheese microbial ecosystem functioning by metatranscriptomic analyses

Cheese ripening is a complex biochemical process driven by microbial communities composed of both eukaryotes and prokaryotes. Surface-ripened cheeses are widely consumed all over the world and are appreciated for their characteristic flavor. Microbial community composition has been studied for a...

Keywords: metagenomics

Who is doing what on the cheese surface? Overview of the cheese microbial ecosystem functioning by metatranscriptomic analyses https://tess.elixir-europe.org/materials/who-is-doing-what-on-the-cheese-surface-overview-of-the-cheese-microbial-ecosystem-functioning-by-metatranscriptomic-analyses-55c4b5d0-ba6e-4ae0-879f-7bc27c10b3eb Cheese ripening is a complex biochemical process driven by microbial communities composed of both eukaryotes and prokaryotes. Surface-ripened cheeses are widely consumed all over the world and are appreciated for their characteristic flavor. Microbial community composition has been studied for a long time on surface-ripened cheeses, but only limited knowledge has been acquired about its in situ metabolic activities. We used an iterative sensory procedure to select a simplified microbial consortium, composed of only nine species (three yeasts and six bacteria), producing the odor of Livarot-type cheese when inoculated in a sterile cheese curd. All the genomes were sequenced in order to determine the functional capacities of the different species and facilitate RNA-Seq data analyses. We followed the ripening process of experimental cheeses made using this consortium during four weeks, by metatranscriptomic and biochemical analyses. By combining all of the data, we were able to obtain an overview of the cheese maturation process and to better understand the metabolic activities of the different community members and their possible interactions. We next applied the same approach to investigate the activity of the microorganisms in real cheeses, namely Reblochon-style cheeses. This provided useful insights into the physiological changes that occur during cheese ripening, such as changes in energy substrates, anabolic reactions, or stresses. metagenomics 2016-12-15 2017-01-11
Welcome message

Presentation of the workshop (Chairman: Claudine Médigue)

Keywords: metagenomics

Welcome message https://tess.elixir-europe.org/materials/welcome-message-69dc597e-f839-448f-9c9d-3622ddffd592 Presentation of the workshop (Chairman: Claudine Médigue) metagenomics 2016-12-15 2017-01-11
Soil metagenomics, potential and pitfalls

The soil microorganisms are responsible for a range of critical functions including those that directly affect our quality of life (e.g., antibiotic production and resistance – human and animal health, nitrogen fixation -agriculture, pollutant degradation – environmental bioremediation)....

Keywords: metagenomics

Soil metagenomics, potential and pitfalls https://tess.elixir-europe.org/materials/soil-metagenomics-potential-and-pitfalls-04d3bb46-36ba-47c0-9993-9c7d0aacad32 The soil microorganisms are responsible for a range of critical functions including those that directly affect our quality of life (e.g., antibiotic production and resistance – human and animal health, nitrogen fixation -agriculture, pollutant degradation – environmental bioremediation). Nevertheless, genome structure information has been restricted by a large extent to a small fraction of cultivated species. This limitation can be circumvented now by modern alternative approaches including metagenomics or single cell genomics. Metagenomics includes the data treatment of DNA sequences from many members of the microbial community, in order to either extract a specific microorganism’s genome sequence or to evaluate the community function based on the relative quantities of different gene families. In my talk I will show how these metagenomic datasets can be used to estimate and compare the functional potential of microbial communities from various environments with a special focus on antibiotic resistance genes. However, metagenomic datasets can also in some cases be partially assembled into longer sequences representing microbial genetic structures for trying to correlate different functions to their co-location on the same genetic structure. I will show how the microbial community composition of a natural grassland soil characterized by extremely high microbial diversity could be managed for sequentially attempt to reconstruct some bacterial genomes. Metagenomics can also be used to exploit the genetic potential of environmental microorganisms. I will present an integrative approach coupling rrs phylochip and high throughput shotgun sequencing to investigate the shift in bacterial community structure and functions after incubation with chitin. In a second step, these functions of potential industrial interest can be discovered by using hybridization of soil metagenomic DNA clones spotted on high density membranes by a mix of oligonucleotide probes designed to target genes encoding for these enzymes. After affiliation of the positive hybridizing spots to the corresponding clones in the metagenomic library the inserts are sequenced, DNA assembled and annotated leading to identify new coding DNA sequences related to genes of interest with a good coverage but a low similarity against closest hits in the databases confirming novelty of the detected and cloned genes. metagenomics 2016-12-16 2017-01-11
Sequencing 6000 chloroplast genomes : the PhyloAlps project

Biodiversity is now commonly described by DNA based approches. Several actors are currently using DNA to describe biodiversity, and most of the time they use different genetic markers that is hampering an easy sharing of the accumulated knowledges. Taxonomists rely a lot on the DNA Barcoding...

Keywords: metagenomics

Sequencing 6000 chloroplast genomes : the PhyloAlps project https://tess.elixir-europe.org/materials/sequencing-6000-chloroplast-genomes-the-phyloalps-project-a2b30d75-061a-4663-a5b8-593842df23bf Biodiversity is now commonly described by DNA based approches. Several actors are currently using DNA to describe biodiversity, and most of the time they use different genetic markers that is hampering an easy sharing of the accumulated knowledges. Taxonomists rely a lot on the DNA Barcoding initiative, phylogeneticists often prefer markers with better phylogenic properties, and ecologists, with the coming of the DNA metabarcoding, look for a third class of markers easiest to amplify from environmental DNA. Nevertheless they have all the same need of the knowledge accumulated by the others. But having different markers means that the sequecences have been got from different individuals in differente lab, following various protocoles. On that base, building a clean reference database, merging for each species all the available markers becomes a challenge. With the phyloAlps project we implement genome skimming at a large scale and propose it as a new way to set up such universal reference database usable by taxonomists, phylogeneticists, and ecologists. The Phyloalps project is producing for each species of the Alpine flora at least a genome skim composed of six millions of 100bp sequence reads. From such data it is simple to extract all chloroplastic, mitochondrial and nuclear rDNA markers commonely used. Moreover, most of the time we can get access to the complete chloroplast genome sequence and to a shallow sequencing of many nuclear genes. This methodes have already been successfully applied to algeae, insects and others animals. With the new single cell sequencing methods it will be applicable to most of the unicellular organisms. The good question is now : Can we consider the genome skimming as the next-generation DNA barcode ? metagenomics 2016-12-16 2017-01-11
From Samples to Data : Assuring Downstream Analysis with Upstream Planning

Metagenomic studies have gained increasing popularity in the years since the introduction of next generation sequencing. NGS allows for the production of millions of reads for each sample without the intermediate step of cloning. However, just as in the past, the quality of the data generate by...

Keywords: metagenomics

From Samples to Data : Assuring Downstream Analysis with Upstream Planning https://tess.elixir-europe.org/materials/from-samples-to-data-assuring-downstream-analysis-with-upstream-planning-6fac0f49-b453-4c15-a409-9753fb27ee9b Metagenomic studies have gained increasing popularity in the years since the introduction of next generation sequencing. NGS allows for the production of millions of reads for each sample without the intermediate step of cloning. However, just as in the past, the quality of the data generate by this powerful technology depends on sample preparation, library construction and the selection of appropriate sequencing technology and sequencing depth. Here we explore the different variables involved in the process of preparing samples for sequencing analysis including sample collection, DNA extraction and library construction. We also examine the various sequencing technologies deployed for routine metagenomic analysis and considerations for their use in different model systems including humans, mouse and the environment. Future developments such as long-reads will also be discussed to provide a complete picture of important aspects prior to data analyses which play a critical role in the success of metagenomic studies. metagenomics 2017-01-11
Revealing and analyzing microbial networks: from topology to functional behaviors

Understanding the interactions between microbial communities and their environment well enough to be able to predict diversity on the basis of physicochemical parameters is a fundamental pursuit of microbial ecology that still eludes us. However, modeling microbial communities is a complicated...

Keywords: metagenomics

Revealing and analyzing microbial networks: from topology to functional behaviors https://tess.elixir-europe.org/materials/revealing-and-analyzing-microbial-networks-from-topology-to-functional-behaviors-14d83c7f-c5f9-4738-8cd5-42e48a1088f7 Understanding the interactions between microbial communities and their environment well enough to be able to predict diversity on the basis of physicochemical parameters is a fundamental pursuit of microbial ecology that still eludes us. However, modeling microbial communities is a complicated task, because (i) communities are complex, (ii) most are described qualitatively, and (iii) quantitative understanding of the way communities interacts with their surroundings remains incomplete. Within this seminar, we will illustrate two complementary approaches that aim to overcome these points in different manners. metagenomics 2016-12-16 2017-01-11
Reconstructing genomes from metagenomes: The holy grail of microbiology

Shotgun metagenomics provides insights into a larger context of naturally occurring microbial genomes when short reads are assembled into contiguous DNA segments (contigs). Contigs are often orders of magnitude longer than individual sequences, offering improved annotations, and key information...

Keywords: metagenomics

Reconstructing genomes from metagenomes: The holy grail of microbiology https://tess.elixir-europe.org/materials/reconstructing-genomes-from-metagenomes-the-holy-grail-of-microbiology-be78338f-13ef-40d6-92cf-621fbccf8808 Shotgun metagenomics provides insights into a larger context of naturally occurring microbial genomes when short reads are assembled into contiguous DNA segments (contigs). Contigs are often orders of magnitude longer than individual sequences, offering improved annotations, and key information about the organization of genes in cognate genomes. Several factors affect the assembly performance, and the feasibility of the assembly-based approaches varies across environments. However, increasing read lengths, novel experimental approaches, advances in computational tools and resources, and improvements in assembly algorithms and pipelines render the assembly-based metagenomic workflow more and more accessible. The utility of metagenomic assembly remarkably increases when contigs are organized into metagenome-assembled genomes (MAGs). Often-novel MAGs frequently provide deeper insights into bacterial lifestyles that would otherwise remain unknown as evidenced by recent discoveries. The increasing rate of the recovery of MAGs presents new opportunities to link environmental distribution patterns of microbial populations and their functional potential, and transforms the field of microbiology by providing a more complete understanding of the microbial life, ecology, and evolution. metagenomics 2016-12-16 2017-01-11