高度にモザイク状のミコバクテリオファージゲノムの起源
Marisa L Pedulla1, Michael E Ford, Jennifer M Houtz
1Department of Biological Sciences and Pittsburgh Bacteriophage Institute, University of Pittsburgh, Pittsburgh, PA 15260, USA.
Cell
|April 23, 2003
まとめ
新しく発見されたミコバクテリオファージは,膨大な微生物の多様性とウイルス進化の洞察を明らかにしています. これらのバクテリオファージは,宿主の免疫と病気に影響を与える遺伝子を携えており,細菌感染症の理解を広げています.
科学分野:
- 微生物学 微生物学とは
- ウイルス学 ウイルス学 ウイルス学
- ゲノミクスゲノミクスとは
背景:
- バクテリオファージは,バクテリアを感染させ,微生物の生態系に重大な影響を及ぼす,いたるところに存在するウイルスです.
- マイコバクテリオファージ (Mycobacteriophages) は,ミコバクテリアの種を感染させるウイルスで,細菌の集団を調節する上で極めて重要です.
- バクテリオファージの膨大な多様性は,生物学的および進化的洞察のためのほとんど未開発のリソースを表しています.
研究 の 目的:
- 新しく隔離された10種の菌糸体菌媒体のゲノム配列を分析する.
- ミコバクテリオファージ集団の多様性を探求する.
- ウイルス進化のメカニズムとバクテリオファージにおける遺伝子交換を理解する.
主な方法:
- 10種類の新しい菌糸体菌媒体の分離とゲノム配列決定.
- 配列化されたミコバクテリオファージの比較ゲノム分析.
- 遺伝子交換メカニズム,特に非正規再結合の調査.
主要な成果:
- ゲノム解析により,新たに分離された菌糸体菌類菌類菌類菌類菌類菌類菌類菌類菌類菌類菌類菌類菌類菌類菌類菌類菌類菌類菌類菌類菌類菌類菌類菌類菌類菌類菌類菌類菌類菌類菌類菌類菌類菌類菌類菌類菌類菌類菌類菌類菌類菌類菌類菌類菌類菌類菌類菌類菌類菌類菌類菌類菌類菌類菌類菌類菌類菌類菌類菌類菌類菌類菌類菌類菌類菌類菌類菌類菌類菌類菌類菌類菌類菌類菌類菌類菌類菌類菌類菌類菌類菌類菌類菌類菌類菌類菌類菌類菌類菌類菌類菌類菌類菌類菌類菌類菌類菌類菌類
- 証拠は,これらのファグの間の水平遺伝子転送における不法再結合の役割を支持しています.
- マイコバクテリアの潜伏期,宿主免疫反応,自己免疫疾患に関連する予期せぬ遺伝子がファグゲノム内で特定されました.
結論:
- バクテリオファージ群は驚くほど多様で,膨大な量の遺伝情報を提供する.
- バクテリオファージは,これまで理解されていたよりも,細菌の毒性および宿主反応においてより広範な役割を果たします.
- ウイルスの再結合イベントは,細菌の病原体と宿主相互作用の進化に貢献します.
さらに関連する動画
関連する概念動画
01:30Lytic Cycle of Bacteriophages
60.2K
Bacteriophages, also known as phages, are specialized viruses that infect bacteria. A key characteristic of phages is their distinctive “head-tail” morphology. A phage begins the infection process (i.e., lytic cycle) by attaching to the outside of a bacterial cell. Attachment is accomplished via proteins in the phage tail that bind to specific receptor proteins on the outer surface of the bacterium. The tail injects the phage’s DNA genome into the bacterial cytoplasm. In the...
60.2K
00:43Lysogenic Cycle of Bacteriophages
49.8K
In contrast to the lytic cycle, phages infecting bacteria via the lysogenic cycle do not immediately kill their host cell. Instead, they combine their genome with the host genome, allowing the bacteria to replicate the phage DNA along with the bacterial genome. The incorporated copy of the phage genome is called the prophage. Some prophages can re-activate and enter the lytic cycle. This often occurs in response to a perturbation, such as DNA damage, but can also transpire in the absence of...
49.8K
00:57Viral Recombination
22.3K
Cells are sometimes infected by more than one virus at once. When two viruses disassemble to expose their genomes for replication in the same cell, similar regions of their genomes can pair together and exchange sequences in a process called recombination. Alternatively, viruses with segmented genomes can swap segments in a process called reassortment.
22.3K
01:26DNA Bacteriophages
1.6K
Bacteriophages, or phages, are viruses that specifically infect bacteria, utilizing their genetic material to hijack host cellular machinery for replication. DNA bacteriophages employ single-stranded DNA (ssDNA) or double-stranded DNA (dsDNA) genomes. These phages exhibit diverse replication strategies and host interactions, influencing their ecological roles and applications in biotechnology and medicine.ssDNA BacteriophagesssDNA phages, with their small genomes, utilize unique strategies to...
1.6K
01:29Viruses of Archaea
704
Archaeal viruses play a crucial role in the ecosystems of extremophilic archaea, particularly those belonging to the phyla Euryarchaeota and Crenarchaeota. By shaping host evolution and facilitating gene transfer, these viruses influence microbial communities and contribute to genetic diversity in extreme environments. The archaea they infect thrive in acidic hot springs and hydrothermal vents characterized by high temperatures and low pH. Archaeal viruses exhibit remarkable structural...
704
01:08Evolution of Microbial Genome
110
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.
110