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Summary: A new study reports blood samples taken from those with Schizophrenia contain genetic material from more types of microbes than people without the condition. Additionally, the blood samples contained less CD8+ memory T cells.
Source: Oregon State University.
The blood of schizophrenia patients features genetic material from more types of microorganisms than that of people without the debilitating mental illness, research at Oregon State University has found.
What’s not known is whether that’s a cause or effect of the severe, chronic condition that strikes about one person in 100.
“It’s a common assumption that healthy blood is sterile so some may find it surprising that we even found bacterial genetic material in the bloodstream,” said David Koslicki, a mathematical biologist in the OSU College of Science.
Koslicki and collaborators performed whole-blood transcriptome analyses on 192 people. Subjects included healthy controls as well as those with schizophrenia, bipolar disorder and amyotrophic lateral sclerosis, or Lou Gehrig’s disease.
Transcriptome analysis refers to the sequencing of ribonucleic acid, or RNA. RNA works with DNA, the other nucleic acid – so named because they were first discovered in the cell nuclei of living things – to produce the proteins needed throughout an organism.
Studying the blood samples, researchers detected RNA from a range of bacteria and archaea – with the range wider for schizophrenics than for the other three groups.
“More and more we know the human microbiome plays a huge role in health and disease,” Koslicki said. “Gut bacteria account for most of the trillions of microbial cells in the human body, and this study shows that microbiota in the blood are similar to ones in the mouth and gut. It appears there’s some sort of permeability there into the bloodstream. Down the road, microscopy, culturing or direct measures of permeability may be able to shed light on that.”
Researchers found schizophrenics’ blood samples were more likely to contain two phyla in particular – Planctomycetes and Thermotogae – but the overall results suggest it’s not likely those are the sole reason for the elevated microbial diversity.
Scientists also found fewer of the immunity-enhancing CD8+ memory T cells in the blood of schizophrenics.
“That could suggest a mechanism for why we see increased microbial diversity in the blood, and it’s also possibly affected by lifestyle or health status differences between schizophrenia patients and the other groups,” Koslicki said. “In addition, it’s interesting that bipolar disorder, which is genetically and clinically correlated to schizophrenia, didn’t show a similar increased microbial diversity.”
Koslicki also notes that the RNA sequencing can’t detect if microbes are actually living in the blood, only that their genetic material is there; it could have gotten there from somewhere else in the body.
Scientists at UCLA, the University of California-Davis, the University of California-San Francisco, University Medical Center Utrecht, and Wageningen University collaborated on this study, the first to use unmapped non-human reads to assess the microbiome from whole blood.
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Funding: The National Institutes of Health, the National Institute of Mental Health and the National Science Foundation supported this research.
Source: David Koslicki – Oregon State University Publisher: Organized by NeuroscienceNews.com. Image Source: NeuroscienceNews.com image is in the public domain. Original Research: Open access research for “Transcriptome analysis in whole blood reveals increased microbial diversity in schizophrenia” by Loes M. Olde Loohuis, Serghei Mangul, Anil P. S. Ori, Guillaume Jospin, David Koslicki, Harry Taegyun Yang, Timothy Wu, Marco P. Boks, Catherine Lomen-Hoerth, Martina Wiedau-Pazos, Rita M. Cantor, Willem M. de Vos, René S. Kahn, Eleazar Eskin & Roel A. Ophoff in Translational Psychiatry. Published May 10 2018 doi:10.1038/s41398-018-0107-9
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[cbtabs][cbtab title=”MLA”]Oregon State University “Schizophrenics’ Blood Has More Genetic Material From Microbes.” NeuroscienceNews. NeuroscienceNews, 22 May 2018. <https://neurosciencenews.com/schizophrenia-blood-microbes-9107/>.[/cbtab][cbtab title=”APA”]Oregon State University (2018, May 22). Schizophrenics’ Blood Has More Genetic Material From Microbes. NeuroscienceNews. Retrieved May 22, 2018 from https://neurosciencenews.com/schizophrenia-blood-microbes-9107/[/cbtab][cbtab title=”Chicago”]Oregon State University “Schizophrenics’ Blood Has More Genetic Material From Microbes.” https://neurosciencenews.com/schizophrenia-blood-microbes-9107/ (accessed May 22, 2018).[/cbtab][/cbtabs]
Transcriptome analysis in whole blood reveals increased microbial diversity in schizophrenia
The role of the human microbiome in health and disease is increasingly appreciated. We studied the composition of microbial communities present in blood across 192 individuals, including healthy controls and patients with three disorders affecting the brain: schizophrenia, amyotrophic lateral sclerosis, and bipolar disorder. By using high-quality unmapped RNA sequencing reads as candidate microbial reads, we performed profiling of microbial transcripts detected in whole blood. We were able to detect a wide range of bacterial and archaeal phyla in blood. Interestingly, we observed an increased microbial diversity in schizophrenia patients compared to the three other groups. We replicated this finding in an independent schizophrenia case–control cohort. This increased diversity is inversely correlated with estimated cell abundance of a subpopulation of CD8+ memory T cells in healthy controls, supporting a link between microbial products found in blood, immunity and schizophrenia.
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