Altered Gut Microbiome in ME/CFS Patients in Comparison to Healthy Controls
Maureen R. Hanson1, Ludovic Giloteaux1, Julia K. Goodrich2, Susan M. Levine1,3, and Ruth E. Ley1,2
1Cornell University, Dept. of Molecular Biology and Genetics, Ithaca NY, 2Cornell University, Dept. of Microbiology,
Ithaca NY 3Private Practice, New York City
Objectives. As well as the symptoms of fatigue, pain, malaise, immune dysfunction and exercise intolerance, Myalgic
Encephalomyelitis/Chronic Fatigue Syndrome (ME/CFS) is associated with a variety of gastrointestinal complaints. In
order to investigate the possible basis of this comorbid condition, we undertook a study to determine whether the gut
microbiome in a ME/CFS population from the New York City area differs from healthy individuals.
Methods. We characterized the gut microbiota of a cohort of 48 patients with ME/CFS and 36 healthy controls from the
New York City region by sequencing amplicons of the V4 region of 16S rRNA genes using the Illumina platform. Of the
ME/CFS subjects, average age was 50.6 ± 13.3, 38 were female and 10 were male, while of the controls, average age was 46.5 ± 9.7, 29 were female, 7 were male. All patients fulfilled the Fukuda criteria for diagnosis of CFS. Levels of markers
of inflammation, i.e. lipopolysaccharide (LPS), soluble CD14 (sCD14) and lactoferrin (LF) levels were also determined in
plasma samples using standard assays.
Results. We obtained an average of 140,000 (± 86,000) high quality reads per sample. In both cases and controls, the
most represented phyla were Firmicutes, Bacteroidetes, Proteobacteria, and Actinobacteria. Comparisons between cases
and controls indicated a shift of diversity in the patient cohort. Statistical analysis revealed significant differences
between groups, i.e. a reduction in members of the Bacteroidetes and an increase in members of the Firmicutes in the
patient population, also reported in Crohn’s disease and acute ulcerative colitis. Specific species, including reduction of
butyrate-producer Roseburia faecis (p = 0.001, q = 0.03) and increase of Ruminococcus spp. (p < 0.001, q = 0.004), were
detected in subjects with ME/CFS. The amounts of LPS, sCD14 and LF in plasma in our cohort were not statistically
different from controls and fell within normal ranges. Our data do not corroborate prior reports of significantly higher
levels of Lactonifactor, Alistipes and Enterococci in the feces of patients.
Conclusion. Subjects with ME/CFS in our cohort have a shift in overall microbial composition in comparison to healthy
donors, a finding also characteristic of patients with inflammatory bowel disease. Our analyses highlight the contrast
between the distribution of anti-inflammatory species, such as Roseburia species, which are more prevalent in healthy
individuals, and potentially pro-inflammatory Ruminococcaceae, which are associated with irritable bowel syndrome and
found to be more frequent in ME/CFS cases. Despite the differences in gut microbiome, three inflammatory markers did
not differ between patients and controls in plasma. Whether deliberate manipulation of the composition of the gut
microbiome in ME/CFS patients may ameliorate symptoms in some patients remains to be investigated.
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Sasha it will be good to see the full paper when it is published.