Genomic characterization of the species complex, a ubiquitous member of the human skin microbiome.

is a predominant genus in the skin microbiome, yet its genetic diversity on skin is incompletely characterized and lacks a comprehensive set of reference genomes. Our work aims to investigate the distribution of species on the skin, as well as to expand the existing genome reference catalog to enable more complete characterization of skin metagenomes. We used V1-V3 16S rRNA gene sequencing data from 14 body sites of 23 healthy volunteers to characterize diversity and distribution across healthy human skin. is the predominant species found on human skin and we identified two distinct ribotypes (A & B) that can be distinguished by variation in the 16S rRNA V1-V3 sequence. One is distributed across all body sites and the other found primarily on the feet. We performed whole genome sequencing of 40 isolates cultured from the skin of five healthy individuals across seven skin sites. We generated five closed genomes of diverse which revealed that isolates are largely syntenic and carry a diversity of methylation patterns, plasmids and CRISPR/Cas systems. The pangenome of is open with a core genome size of 1806 genes and a pangenome size of 5451 total genes. This expanded pangenome enabled the mapping of 24% more reads from shotgun metagenomic datasets derived from skin body sites. Finally, while the genomes from this study all fall within a species complex, the ribotype B isolates may constitute a new species.