Metagenomic testing as a means of identifying the pathogens causing Dermatitis [and other skin diseases]
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A description of the experience
Sci Transl Med. 2017 Jul 5;9(397). pii: eaal4651. doi: 10.1126/scitranslmed.aal4651.
Staphylococcus aureus and Staphylococcus epidermidis strain diversity underlying pediatric atopic dermatitis.
Byrd AL1,2,3, Deming C1, Cassidy SKB1, Harrison OJ3, Ng WI1, Conlan S1; NISC Comparative Sequencing Program, Belkaid Y3,4, Segre JA5, Kong HH6.
1Microbial Genomics Section, National Human Genome Research Institute, National Institutes of Health (NIH), Bethesda, MD 20892, USA.
2Department of Bioinformatics, Boston University, Boston, MA 02215, USA.
3Mucosal Immunology Section, Laboratory of Parasitic Diseases, National Institute of Allergy and Infectious Diseases (NIAID), NIH, Bethesda, MD 20892, USA.
4NIAID Microbiome Program, Department of Intramural Research, NIAID, NIH, Bethesda, MD 20892, USA.
5Microbial Genomics Section, National Human Genome Research Institute, National Institutes of Health (NIH), Bethesda, MD 20892, USA. email@example.com firstname.lastname@example.org.
6Dermatology Branch, Center for Cancer Research, National Cancer Institute, NIH, Bethesda, MD 20892, USA. email@example.com firstname.lastname@example.org.
The heterogeneous course, severity, and treatment responses among patients with atopic dermatitis (AD; eczema) highlight the complexity of this multifactorial disease. Prior studies have used traditional typing methods on cultivated isolates or sequenced a bacterial marker gene to study the skin microbial communities of AD patients. Shotgun metagenomic sequence analysis provides much greater resolution, elucidating multiple levels of microbial community assembly ranging from kingdom to species and strain-level diversification. We analyzed microbial temporal dynamics from a cohort of pediatric AD patients sampled throughout the disease course. Species-level investigation of AD flares showed greater Staphylococcus aureus predominance in patients with more severe disease and Staphylococcus epidermidis predominance in patients with less severe disease. At the strain level, metagenomic sequencing analyses demonstrated clonal S. aureus strains in more severe patients and heterogeneous S. epidermidis strain communities in all patients. To investigate strain-level biological effects of S. aureus, we topically colonized mice with human strains isolated from AD patients and controls. This cutaneous colonization model demonstrated S. aureus strain-specific differences in eliciting skin inflammation and immune signatures characteristic of AD patients. Specifically, S. aureus isolates from AD patients with more severe flares induced epidermal thickening and expansion of cutaneous T helper 2 (TH2) and TH17 cells. Integrating high-resolution sequencing, culturing, and animal models demonstrated how functional differences of staphylococcal strains may contribute to the complexity of AD disease.
[Available on 2018-07-05]