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マンモットのミトコンドリアゲノムのマルチプレックス増幅とエレファント族の進化
Johannes Krause1, Paul H Dear, Joshua L Pollack
1Max Planck Institute for Evolutionary Anthropology, Deutscher Platz 6, D-04103 Leipzig, Germany.
Nature
|December 20, 2005
まとめ
研究者は,退廃したDNAを検出する新しい方法を用いて,毛皮のマンモス (Mammuthus primigenius) の完全なミトコンドリアゲノムを配列化した. 系統遺伝学的分析により,マモスはアフリカゾウよりもアジアゾウに密接に関連していることが明らかになった.
科学分野:
- パレオゲノミクスとは
- 分子進化は分子進化である
- 古代DNA分析 古代DNA分析について
背景:
- 絶滅した種のゲノムを研究することは,限られた量と劣化した古代DNAのために困難です.
- オーバーラッピングポリメラーゼ連鎖反応 (PCR) 製品のような以前の方法では,より長いDNA配列の再構築が可能でしたが,サンプル増幅によって制限されていました.
- よく研究されたプレイストセンの種でも,約1,000塩基対 (bp) 以上のDNA配列はめったに再構築されませんでした.
研究 の 目的:
- プレイストセンの毛皮マンモス (Mammuthus primigenius) の完全なミトコンドリアゲノム配列を報告する.
- 少量の劣化したDNAから同時に複数の配列を回収するための新しいアプローチを開発し,適用する.
- マンモスと現代のゾウの遺伝関係を調査する.
主な方法:
- 約200mgの毛皮のマンモス標本からの骨を使用しました.
- 劣化したDNAから複数の配列を同時に増幅できる新しいDNA回収技術を使用しました.
- 再構築されたミトコンドリアのゲノム配列に基づいて,系統遺伝分析を行った.
主要な成果:
- ミトコンドリアの全ゲノム配列を再構築した,毛皮のマンモス (Mammuthus primigenius).
- 系統遺伝学的分析により,毛深いマモットはアフリカゾウよりもアジアゾウに密接に関連していることが示されました.
- マンモス,アフリカ,アジアゾウの分岐時間は急速に発生し,その全体の進化の歴史のわずかな部分を表しています.
結論:
- この新しい方法は,限られた,劣化した古代DNAサンプルから完全なミトコンドリアゲノムの配列を解析することを容易にする.
- この研究は,ゾウのファミリーツリー内の毛深いマンモスの進化的位置を明らかにしています.
- これらの系統の急速な分岐は, proboscideansの進化のダイナミクスについての洞察を提供します.
関連する概念動画
Limits to Natural Selection
Organisms that are well-adapted to their environment are more likely to survive and reproduce. However, natural selection does not lead to perfectly adapted organisms. Several factors constrain natural selection.
Convergent Evolution
Evolution shapes the features of organisms over time, ensuring that they are suited for the environments in which they live. Sometimes, selection pressure leads to the rise of similar but unrelated adaptations in organisms with no recent common ancestors, a process known as convergent evolution.
Gene Evolution - Fast or Slow?
The genomes of eukaryotes are punctuated by long stretches of sequence which do not code for proteins or RNAs. Although some of these regions do contain crucial regulatory sequences, the vast majority of this DNA serves no known function. Typically, these regions of the genome are the ones in which the fastest change, in evolutionary terms, is observed, because there is typically little to no selection pressure acting on these regions to preserve their sequences.
In contrast, regions which code...
In contrast, regions which code...
Evolutionary Relationships through Genome Comparisons
Genome comparison is one of the excellent ways to interpret the evolutionary relationships between organisms. The basic principle of genome comparison is that if two species share a common feature, it is likely encoded by the DNA sequence conserved between both species. The advent of genome sequencing technologies in the late 20th century enabled scientists to understand the concept of conservation of domains between species and helped them to deduce evolutionary relationships across diverse...
Gene Duplication and Divergence
The seminal work of Ohno in 1970 popularized the idea of gene duplication and divergence. DNA sequence comparison studies reveal that a large portion of the genes in bacteria, archaebacteria, and eukaryotes was generated by gene duplication and divergence, indicating its critical role in evolution.
The duplicated copies of the gene are called Paralogs. Paralogs with similar sequences and functions form a gene family. Across several species, a large number of gene families are characterized.
The duplicated copies of the gene are called Paralogs. Paralogs with similar sequences and functions form a gene family. Across several species, a large number of gene families are characterized.
Gene Evolution - Fast or Slow?
The genomes of eukaryotes are punctuated by long stretches of sequence which do not code for proteins or RNAs. Although some of these regions do contain crucial regulatory sequences, the vast majority of this DNA serves no known function. Typically, these regions of the genome are the ones in which the fastest change, in evolutionary terms, is observed, because there is typically little to no selection pressure acting on these regions to preserve their sequences.
In contrast, regions which code...
In contrast, regions which code...

