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Related Experiment Video

Updated: Jun 30, 2026

Microbiota Analysis Using Two-step PCR and Next-generation 16S rRNA Gene Sequencing

Microbiota Analysis Using Two-step PCR and Next-generation 16S rRNA Gene Sequencing

Published on: October 15, 2019

Gut Microbiota, Immune Phenotypes, and Insomnia: A Two-Sample Mendelian Randomization Study.

Xiaofeng Jiang¹, Bin Yu¹

¹Department of Anesthesiology and Pain Rehabilitation, Cardiopulmonary and Critical Care Rehabilitation Center, Shanghai Yangzhi Rehabilitation Hospital (Shanghai Sunshine Rehabilitation Center), School of Medicine, Tongji University, Shanghai, People's Republic of China.

Nature and Science of Sleep

|June 29, 2026

Summary

Genetic analysis suggests gut bacteria influence insomnia risk. The species Blautia A sp900066355 shows a protective effect, while certain immune cells may mediate this link, offering new insights into insomnia causes.

Keywords:

Mendelian randomization immunity inflammation insomnia microbiota

Related Experiment Videos

Last Updated: Jun 30, 2026

Microbiota Analysis Using Two-step PCR and Next-generation 16S rRNA Gene Sequencing

Microbiota Analysis Using Two-step PCR and Next-generation 16S rRNA Gene Sequencing

Published on: October 15, 2019

Area of Science:

Microbiome research
Immunology
Sleep science

Background:

The gut microbiota-brain axis is a key area for understanding insomnia.
Genetic evidence is needed to confirm causal links between gut microbes, immune pathways, and insomnia.

Purpose of the Study:

To investigate genetic evidence for the causal relationship between gut microbiota, immune phenotypes, and insomnia.
To explore the role of immune pathways in mediating the effects of gut microbes on insomnia.

Main Methods:

Utilized two-sample bidirectional Mendelian randomization (MR).
Analyzed large-scale genome-wide association study (GWAS) summary statistics for gut microbiota, immune cell phenotypes, and insomnia.
Performed mediation analysis to assess indirect effects of immune cells.

Main Results:

Identified 13 gut microbial taxa associated with insomnia risk.
Found Blautia A sp900066355 has a significant protective association with insomnia.
Observed associations between 17 immune phenotypes and insomnia, with monocytic myeloid-derived suppressor cells (M-MDSCs) potentially mediating the link to an uncultured bacterium.

Conclusions:

Provides preliminary genetic evidence linking specific gut microbes and immune phenotypes to insomnia.
Suggests Blautia A sp900066355 may protect against insomnia.
Proposes a hypothesis that M-MDSC depletion, not just inflammation, might contribute to insomnia pathogenesis, requiring further investigation.