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Metagenomic Profiling, Interaction of Genomics with Meta-genomics

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Application of Clinical Bioinformatics

Part of the book series: Translational Bioinformatics ((TRBIO,volume 11))

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Abstract

Metagenomics is about the sequencing and characterization of genomic DNA of uncultured microbes sampled directly from their habitats. Next-generation sequencing (NGS) technologies and the ability of sequencing uncultured microbes have dramatically expanded and transformed our knowledge of the microbial world. In this chapter, we provide an introduction and flavor to metagenomic studies from sampling to data analysis. Also, workflow and several common methodologies are summarized for the sequence-driven metagenomic analysis to identify the composition of microbes, compare different microbial communities, characterize the functional potential of microbial communities and infer the microbes, which are involved in the metabolic pathways. Additionally, we describe some well-established platforms and software, and briefly review their utilities. Finally, an explication of interactions between genomics and meta-genomics gives a new view for host phenotype-genotype analysis.

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Abbreviations

Egg:

NOG Evolutionary genealogy of genes: non-supervised ortholog groups

EVA:

Entity attribute value

FDR:

False discovery rate

FP:

Fecal protease

GWAS:

Genome-wide association study

HMP:

Human Microbiome Project

IBD:

Inflammatory bowel disease

IBS:

Irritable bowel syndrome

KEGG:

Kyoto encyclopedia of genes and genomes

KR:

Kantorovich-Rubinstein

MDA:

Multiple displacement amplification

MGWAS:

Metagenome-wide association study

MiRKAT:

Microbiome regression based on kernel association test

MSA:

Multiple sequence alignment

NGS:

Next-generation sequencing

OTU:

Operational taxonomic unit

PCR:

Polymerase chain reaction

PCoA:

Principal Coordinate Analysis

PERMANOVA:

Permutational multivariate analysis of variance

QIIME:

Quantitative insights into microbial ecology

RDP:

Ribosomal Database Project

T2D:

Type 2 diabetes

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Correspondence to Ruifeng Wang .

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Appendix

Appendix

DNA isolation of fecal sample

  • Collection and preparation of fecal samples

Fecal samples should be collected and processed timely, ideally within 4 h. After adding equal volume of sterile milli-q water (1:1 feces/water), fecal samples need to be homogenized thoroughly. Then about 1–10 ml slurries will be transferred to cryogenic tubes and frozen at −80 °C until DNA extraction.

  • DNA extraction and purification

There are two common methods for fecal DNA purification. One is from the Metagenomics of the Human Intestinal Tract (MetaHIT) project in Europe and the other one is from the National Institutes of Health's Human Microbiome Project (HMP). The MetaHIT protocol mainly uses laboratory-made buffers and solutions, while HMP protocol is based on Mobio PowerLyzer™ PowerSoil® DNA isolation Kit (MO BIO Laboratories) (Wesolowska-Andersen et al. 2014). The MetaHIT method yields significantly higher DNA amount than HMP approach; however, yield and purity of DNA extracted with both protocols were sufficient for Illumina-based deep metagenome sequencing (Wesolowska-Andersen et al. 2014).

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© 2016 Springer Science+Business Media Dordrecht

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Wang, R., Zhou, Y., Cao, S., Wang, Y., Zhang, J., Deng, HW. (2016). Metagenomic Profiling, Interaction of Genomics with Meta-genomics. In: Wang, X., Baumgartner, C., Shields, D., Deng, HW., Beckmann, J. (eds) Application of Clinical Bioinformatics. Translational Bioinformatics, vol 11. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-7543-4_9

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