Abstract
In this paper, we present DNPipe, a Pipeline that processes and filters the transcript contigs reported by existing De Novo metatranscriptome assembly algorithms, aiming to improve the quality of de novo assembly of metatranscriptomic sequences. DNPipe consists of expectation-maximisation (EM) and sampling approaches that utilise abundance information of transcript contigs. We tested DNPipe on six metatranscriptomic datasets acquired from a mock microbial community dominated by three (among more than 15) known bacterial genomes. Results show that DNPipe can substantially improve the quality of metatranscriptome assembly, producing longer and more accurate transcripts. The N50 of the contigs increases by 19% (from around 1880 bps to 2250 bps), and the precision of the assembly improves by up to 8.7%, achieving about 81%. DNPipe assemblies are of higher quality than those assembled by Trinity as well. The DNPipe tool can be downloaded as open source software at https://sourceforge.net/projects/dnpipe/files/.
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