関連する実験動画
Updated: Jun 12, 2026

07:21
Tick Microbiome Characterization by Next-Generation 16S rRNA Amplicon Sequencing
Published on: August 25, 2018
まとめ
研究者は178の微生物ゲノムを配列化し,3万以上の新しいポリペプチドを特定しました. このヒト微生物群のデータは,微生物の多様性とその健康と病気との関連に関する理解を深める.
科学分野:
- 微生物学 微生物学とは
- ゲノミクスゲノミクスとは
- バイオインフォマティックス
背景:
- 人間の微生物群は,健康と病気に影響を与える多様な微生物で構成されています.
- 国立衛生研究所 (NIH) のイニシアチブは,微生物種の多様性を特徴づけることを目的としています.
- メタゲノム配列と参照ゲノム配列は,このイニシアチブの重要な構成要素です.
研究 の 目的:
- 178の微生物ゲノムから得られた最初の参照ゲノム配列解析結果を紹介する.
- これらの微生物ゲノム内の新しいポリペプチドを特定するために.
- 微生物群の配列解析のための参照セットの有用性を評価する.
主な方法:
- 178の微生物のリファレンスゲノムをシーケンシングした.
- 特定の長さとシーケンスホモロジー基準を持つポリペプチドの識別.
- BLASTPの分析は,非冗長なデータベースに対して行われます.
- データセットの飽和度を評価するためのパンゲノム分析.
主要な成果:
- 30,867種類の新しいポリペプチドが特定され,その97%がユニークでした.
- 参照ゲノムセットは,胃腸道微生物群の配列の約40%を特定の生物と関連付けることを可能にします.
- パンゲノム解析は,微生物遺伝子のデータセットがまだ飽和していないことを示しています.
結論:
- 最初の178の微生物参照ゲノムは,微生物群の研究に貴重なリソースを提供します.
- 数多くの新しい微生物ポリペプチドが発見されました.
- 人間の微生物群の遺伝的多様性を完全に捉えるためには,さらなるシーケンシングが必要である.
関連する概念動画
Introduction to the Human Microbiota
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...
Evolution of Microbial Genome
Microbial genome evolution is a highly dynamic process shaped by continual gene gain and loss across species and strains. This genomic flexibility allows microorganisms to adapt rapidly to environmental pressures and interactions with other organisms. Central to understanding this diversity is the distinction between the core and pan genomes.The core genome comprises the genes shared by all sampled strains of a species, representing essential functions needed for fundamental cellular processes.
Human Virome
The human body harbors a vast and diverse viral community known as the human virome. The virome includes bacteriophages that infect bacteria, and eukaryotic viruses that infect human cells. Transient dietary and environmental viruses also contribute to this dynamic ecosystem. Estimates suggest the human body may contain on the order of 10¹³ viral particles, though abundance varies widely by body site and detection method.Comprehensive characterization of the virome has become possible only with...
Bacteriophages of the Human Virome
Bacteriophages are found throughout the human body. They may even outnumber eukaryotic viruses, forming an important and dynamic component of the human virome. Indeed, phages represent the most abundant viral entities, with densities in the gut reaching up to 10⁹ particles per gram of fecal matter, and many belonging to orders such as Caudovirales and Microviridae, while a substantial proportion remains unclassified as viral “dark matter.”Lysogeny and Genetic ExchangeIn the gut, bacteriophages...
Modern Molecular Taxonomy
Advancements in molecular biology have revolutionized the identification and characterization of bacteria, with multiple methods leveraging DNA sequencing for enhanced precision. As sequencing technologies improve and costs decline, these approaches are increasingly used in clinical, environmental, and evolutionary studies.Multilocus Sequence Typing (MLST) examines several housekeeping genes, essential chromosomal genes encoding cellular functions, to distinguish strains. Approximately...
Development of Human Microbiota
The human microbiota begins developing at birth and undergoes continual change as we age. Infancy marks a critical period of microbial sensitivity, offering a “window of opportunity” during which beneficial microbes help mature the immune system. By age three, children typically develop a more stable and diverse microbial community. Newborns acquire microbes from their immediate environment; vaginal delivery favors maternal vaginal microbes, while cesarean births favor microbes from the skin...

