Metagenomic profiling of host-associated bacteria from 8 datasets of 1 the red alga Porphyra purpurea, with MetaPhlAn 3.0

Abstract

Microbial communities play a fundamental role in the association with marine algae, in fact they are recognized to be actively involved in growth and morphogenesis. Porphyra purpurea is a red algae commonly found in the intertidal zone with an high economical value, indeed several species belonging to the genus Porphyra are intensely cultivated in the Eastern Asian countries. Moreover, P. purpurea is widely used as model species in different fields, mainly due to its peculiar life cycle. Despite of that, little is known about the microbial community associated to this species. Here we report the microbial-associated diversity of P. purpurea in four different localities (Ireland, Italy United Kingdom and USA) through the analysis of eight metagenomic datasets obtained from the publicly available metagenomic nucleotide database (https://www.ebi.ac.uk/ena/). The metagenomic datasets were quality controlled with FastQC version 0.11.8, pre-processed with Trimmomatic version 0.39 and analysed with Methaplan 3.0, with a reference database containing clade specific marker genes from ~ 99.500 bacterial genomes, following the pan-genome approach, in order to identify the putative bacterial taxonomies and their relative abundances. Furthermore, we compared the results to the 16S rRNA metagenomic analysis pipeline of MGnify database to evaluate the effectiveness of the two methods. Out of the 43 bacterial species identified with MetaPhlAn 3.0 only 5 were common with the MGnify results and from the 21 genera, only 9 were common. This approach highlighted the different taxonomical resolution of a 16S rRNA OTU-based method in contrast to the pan-genome approach deployed by MetaPhlAn 3.0.