Gut microbiota composition correlates with insomnia severity: insights from high-throughput sequencing analysis

Area of Science:

• Microbiome research
• Sleep science
• Gut-brain axis studies

Background:

• Insomnia is a prevalent sleep disorder with significant health implications.
• The gut microbiome plays a crucial role in host physiology, including neurological functions.
• Emerging evidence suggests a link between gut microbiota dysbiosis and sleep disturbances.

Purpose of the Study:

• To investigate differential alterations in gut microbiota composition and diversity across varying degrees of insomnia severity.
• To provide empirical evidence elucidating the relationship between sleep disorders and the gut microbiome.
• To identify specific microbial signatures associated with insomnia.

Main Methods:

• 120 insomnia patients and 20 healthy controls were enrolled.
• Gut microbiota was analyzed using 16S rDNA high-throughput sequencing on the Illumina NovaSeq platform.
• Alpha and beta diversity, along with species composition, were assessed across mild, moderate, and severe insomnia groups.

Main Results:

• Alpha diversity indices (Chao1, ACE) were elevated in insomnia patients compared to controls.
• Beta diversity analysis showed significant differences in microbial community structure correlating with insomnia severity.
• A progressive decline in the Firmicutes/Bacteroidetes ratio and Clostridia abundance was observed with increasing insomnia severity.

Conclusions:

• Gut microbiota structure is intrinsically linked to insomnia severity.
• A diminished Firmicutes/Bacteroidetes ratio and reduced Clostridia abundance characterize insomnia.
• These microbial shifts may impair neuro-immune regulation via the gut-brain axis, potentially exacerbating sleep dysregulation.