AUTHOR=dos Santos Renato A. C. , Steenwyk Jacob L. , Rivero-Menendez Olga , Mead Matthew E. , Silva Lilian P. , Bastos Rafael W. , Alastruey-Izquierdo Ana , Goldman Gustavo H. , Rokas Antonis 

TITLE=Genomic and Phenotypic Heterogeneity of Clinical Isolates of the Human Pathogens Aspergillus fumigatus, Aspergillus lentulus, and Aspergillus fumigatiaffinis

JOURNAL=Frontiers in Genetics

VOLUME=11

YEAR=2020

URL=https://www.frontiersin.org/journals/genetics/articles/10.3389/fgene.2020.00459

DOI=10.3389/fgene.2020.00459

ISSN=1664-8021

ABSTRACT=<p>Fungal pathogens are a global threat to human health. For example, fungi from the genus <italic>Aspergillus</italic> cause a spectrum of diseases collectively known as aspergillosis. Most of the &gt;200,000 life-threatening aspergillosis infections per year worldwide are caused by <italic>Aspergillus fumigatus</italic>. Recently, molecular typing techniques have revealed that aspergillosis can also be caused by organisms that are phenotypically similar to <italic>A. fumigatus</italic> but genetically distinct, such as <italic>Aspergillus lentulus</italic> and <italic>Aspergillus fumigatiaffinis</italic>. Importantly, some of these so-called cryptic species are thought to exhibit different virulence and drug susceptibility profiles than <italic>A. fumigatus</italic>, however, our understanding of their biology and pathogenic potential has been stymied by the lack of genome sequences and phenotypic profiling of multiple clinical strains. To fill this gap, we phenotypically characterized the virulence and drug susceptibility of 15 clinical strains of <italic>A. fumigatus</italic>, <italic>A. lentulus</italic>, and <italic>A. fumigatiaffinis</italic> from Spain and sequenced their genomes. We found heterogeneity in drug susceptibility across species and strains. We further found heterogeneity in virulence within each species but no significant differences in the virulence profiles between the three species. Genes known to influence drug susceptibility (<italic>cyp51A</italic> and <italic>fks1</italic>) vary in paralog number and sequence among these species and strains and correlate with differences in drug susceptibility. Similarly, genes known to be important for virulence in <italic>A. fumigatus</italic> showed variability in number of paralogs across strains and across species. Characterization of the genomic similarities and differences of clinical strains of <italic>A. lentulus</italic>, <italic>A. fumigatiaffinis</italic>, <italic>and A. fumigatus</italic> that vary in disease-relevant traits will advance our understanding of the variance in pathogenicity between <italic>Aspergillus</italic> species and strains that are collectively responsible for the vast majority of aspergillosis infections in humans.</p>