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Fast and simple protein-alignment-guided assembly of orthologous gene families from microbiome sequencing reads.

Abstract：

BACKGROUND:Microbiome sequencing projects typically collect tens of millions of short reads per sample. Depending on the goals of the project, the short reads can either be subjected to direct sequence analysis or be assembled into longer contigs. The assembly of whole genomes from metagenomic sequencing reads is a very difficult problem. However, for some questions, only specific genes of interest need to be assembled. This is then a gene-centric assembly where the goal is to assemble reads into contigs for a family of orthologous genes. METHODS:We present a new method for performing gene-centric assembly, called protein-alignment-guided assembly, and provide an implementation in our metagenome analysis tool MEGAN. Genes are assembled on the fly, based on the alignment of all reads against a protein reference database such as NCBI-nr. Specifically, the user selects a gene family based on a classification such as KEGG and all reads binned to that gene family are assembled. RESULTS:Using published synthetic community metagenome sequencing reads and a set of 41 gene families, we show that the performance of this approach compares favorably with that of full-featured assemblers and that of a recently published HMM-based gene-centric assembler, both in terms of the number of reference genes detected and of the percentage of reference sequence covered. CONCLUSIONS:Protein-alignment-guided assembly of orthologous gene families complements whole-metagenome assembly in a new and very useful way.

journal_name

Microbiome

journal_title

Microbiome

authors

Huson DH,Tappu R,Bazinet AL,Xie C,Cummings MP,Nieselt K,Williams R

doi

10.1186/s40168-017-0233-2

subject

Has Abstract

pub_date

2017-01-25 00:00:00

pages

11

issue

1

issn

2049-2618

pii

10.1186/s40168-017-0233-2

journal_volume

5

pub_type

杂志文章

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