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Related Concept Videos

Methods to Assess Microbial Communities01:19

Methods to Assess Microbial Communities

Microbial communities, comprising bacteria, archaea, and eukaryotic microorganisms, inhabit diverse ecosystems and play crucial roles in environmental and biological processes. Their diversity is defined by three main parameters: species richness (the number of distinct species), species abundance (the relative quantity of each species), and species evenness (how uniformly individual species are distributed in various locations). These factors together shape the structure and ecological balance...
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Microorganisms colonize various regions of the human body, including the mouth, nasal passages, throat, stomach, intestines, urogenital tract, and skin. The total number of microbial cells is estimated to range from 10¹³ to 10¹⁴—comparable to, or exceeding, the number of human somatic cells. This host–microbiome relationship has led to the conceptualization of humans as supraorganisms, wherein microbial communities perform vital roles in development, immunity, and disease...

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High-resolution microbiome analysis of host-rich samples using 2bRAD-M without host depletion.

Yuesong Jiang1, Jiang Liu2, Yufeng Zhang1

  • 1Faculty of Dentistry, The University of Hong Kong, Hong Kong SAR, China.

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A new method, 2bRAD-M, efficiently analyzes human microbiota in samples with high host DNA. This reduced sequencing approach bypasses host DNA depletion, offering a practical solution for microbiome research.

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Area of Science:

  • Microbiology
  • Genomics
  • Bioinformatics

Background:

  • Characterizing human microbiota is vital for understanding host-microbe interactions.
  • High host DNA context (HoC) presents a significant challenge in analyzing host-dominated samples.
  • Existing host DNA depletion methods suffer from DNA loss and require immediate sample processing.

Purpose of the Study:

  • To introduce 2bRAD-M, a reduced metagenomic sequencing method for efficient host-microbe analysis.
  • To enable microbiome analysis without prior host DNA depletion.
  • To provide a practical and efficient solution for samples with high host DNA context.

Main Methods:

  • Development and validation of 2bRAD-M, a reduced metagenomic sequencing technique.
  • Application of 2bRAD-M to mock samples with >90% human DNA.
  • Comparative analysis of 2bRAD-M with whole metagenome sequencing (WMS) on saliva and oral cancer samples.
  • Utilizing 2bRAD-M in an early childhood caries (ECC) study.

Main Results:

  • 2bRAD-M achieved over 93% in AUPR and L2 similarity on mock samples.
  • 2bRAD-M profiles closely matched WMS profiles in saliva and oral cancer samples.
  • In saliva samples, 2bRAD-M captured diurnal and host-specific patterns using only 5-10% of sequencing effort.
  • 2bRAD-M identified key bacterial indicators in an ECC study, distinguishing ECC from healthy subjects with an AUC of 0.92.

Conclusions:

  • 2bRAD-M provides high-resolution microbial profiles without the need for host DNA depletion.
  • The method is validated for its efficiency and accuracy in host-dominated samples.
  • 2bRAD-M offers a practical and cost-effective alternative for microbiome research challenged by high host DNA.