MersV1, Main, Exploration, bibRecord, 001833

Detection of low-abundance bacterial strains in metagenomic datasets by eigengenome partitioning.

Identifieur interne : 001833 ( Main/Exploration ); précédent : 001832; suivant : 001834

Detection of low-abundance bacterial strains in metagenomic datasets by eigengenome partitioning.

Auteurs : Brian Cleary [États-Unis] ; Ilana Lauren Brito [États-Unis] ; Katherine Huang [États-Unis] ; Dirk Gevers [États-Unis] ; Terrance Shea [États-Unis] ; Sarah Young [États-Unis] ; Eric J. Alm [États-Unis]

Source :

Nature biotechnology [ 1546-1696 ] ; 2015.

RBID : pubmed:26368049

Descripteurs français

English descriptors

KwdEn :
- Algorithms, Bacteria (classification), Bacteria (genetics), Chromosome Mapping (methods), Databases, Genetic, Datasets as Topic, Epigenesis, Genetic (genetics), Genome, Bacterial (genetics), Metagenomics (methods), Microbiota (genetics), Sequence Analysis, DNA (methods), Species Specificity.
MESH :
- classification : Bacteria.
- genetics : Bacteria, Epigenesis, Genetic, Genome, Bacterial, Microbiota.
- methods : Chromosome Mapping, Metagenomics, Sequence Analysis, DNA.
- Algorithms, Databases, Genetic, Datasets as Topic, Species Specificity.

Abstract

Analyses of metagenomic datasets that are sequenced to a depth of billions or trillions of bases can uncover hundreds of microbial genomes, but naive assembly of these data is computationally intensive, requiring hundreds of gigabytes to terabytes of RAM. We present latent strain analysis (LSA), a scalable, de novo pre-assembly method that separates reads into biologically informed partitions and thereby enables assembly of individual genomes. LSA is implemented with a streaming calculation of unobserved variables that we call eigengenomes. Eigengenomes reflect covariance in the abundance of short, fixed-length sequences, or k-mers. As the abundance of each genome in a sample is reflected in the abundance of each k-mer in that genome, eigengenome analysis can be used to partition reads from different genomes. This partitioning can be done in fixed memory using tens of gigabytes of RAM, which makes assembly and downstream analyses of terabytes of data feasible on commodity hardware. Using LSA, we assemble partial and near-complete genomes of bacterial taxa present at relative abundances as low as 0.00001%. We also show that LSA is sensitive enough to separate reads from several strains of the same species.

DOI: 10.1038/nbt.3329
PubMed: 26368049

Affiliations:

Le document en format XML

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<front><div type="abstract" xml:lang="en">Analyses of metagenomic datasets that are sequenced to a depth of billions or trillions of bases can uncover hundreds of microbial genomes, but naive assembly of these data is computationally intensive, requiring hundreds of gigabytes to terabytes of RAM. We present latent strain analysis (LSA), a scalable, de novo pre-assembly method that separates reads into biologically informed partitions and thereby enables assembly of individual genomes. LSA is implemented with a streaming calculation of unobserved variables that we call eigengenomes. Eigengenomes reflect covariance in the abundance of short, fixed-length sequences, or k-mers. As the abundance of each genome in a sample is reflected in the abundance of each k-mer in that genome, eigengenome analysis can be used to partition reads from different genomes. This partitioning can be done in fixed memory using tens of gigabytes of RAM, which makes assembly and downstream analyses of terabytes of data feasible on commodity hardware. Using LSA, we assemble partial and near-complete genomes of bacterial taxa present at relative abundances as low as 0.00001%. We also show that LSA is sensitive enough to separate reads from several strains of the same species. </div>
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Detection of low-abundance bacterial strains in metagenomic datasets by eigengenome partitioning.

Detection of low-abundance bacterial strains in metagenomic datasets by eigengenome partitioning.

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

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