進化の歴史と,アフリカの多様な狩猟採集者の全ゲノム配列の高度なカバーからの適応
Joseph Lachance1, Benjamin Vernot, Clara C Elbers
1Department of Biology, University of Pennsylvania, Philadelphia, PA 19104, USA.
Cell
|July 31, 2012
まとめ
現代のヒトの進化と狩猟採集者の適応は,ピグミー族,ハザ族,サンダウェ族の全ゲノム配列解析を用いて研究された. 発見は,免疫,代謝,生殖に関連する遺伝子における古来の侵入と局所的な適応のサインを明らかにしています.
科学分野:
- 人間の進化遺伝学
- 人口ゲノミクス
- 古代DNA研究 古代DNA研究
背景:
- 人間の進化史を理解することは,遺伝的適応を特定するために極めて重要です.
- 狩猟採集者の集団は,彼らの独特なライフスタイルのために,人間の適応に対するユニークな洞察を提供します.
- 以前の研究では,様々なヒト集団における古来の侵入と局所的適応が強調されています.
研究 の 目的:
- 現代の人類の進化史を再構築する.
- 狩猟採集者の適応に責任を負う遺伝的位置を特定する.
- ピグミー族,ハザ族,サンダウェ族の全ゲノム配列を分析する.
主な方法:
- 3つの狩猟採集集団 (ピグミー族,ハザ族,サンダウェ族) の15人の全ゲノム配列解析で,カバー範囲>60×.
- シングルヌクレオチドポリモルフィズム (SNP) や構造変異を含む遺伝子変異の識別と分析.
- 集団遺伝的方法を使用して,古来の侵入と局所適応のサインの検出.
主要な成果:
- 配列解析により13,400万の変種が特定され,ヒトの既知の多様性を大幅に拡大しました.
- 古代の侵入の証拠は,3つの集団すべてで発見され,ヨーロッパ人と同様のパターンが示されました.
- 免疫,代謝,嗅覚,味覚,生殖,創傷治癒に関連する遺伝子を含め,局所的な適応のサインを示す多数の局所が特定されました.
- 成長と前垂体機能に関連し,身長に影響を与える特定の位置は,ピグミー集団内で特定されました.
結論:
- この研究は,人間の進化史と適応を理解するための包括的なゲノムリソースを提供します.
- 古代の侵入は,これらの狩猟採集集団の進化史に役割を果たした.
- 地元の適応は,狩猟採集集団の重要な生物学的機能を形作っており,人間の多様性にも影響を及ぼしています.
関連する概念動画
02:35What is Evolutionary History?
31.1K
Scientists record evolutionary history by analyzing fossil, morphological, and genetic data. The fossil record documents the history of life on Earth and provides evidence for evolution. However, both fossil and living organisms offer evidence that outlines Earth’s evolutionary history.
31.1K
02:55The Evidence for Evolution
40.1K
Genetic variations accumulating within populations over generations give rise to biological evolution. Evolutionary changes can result in the formation of novel varieties and entire new species. These changes are responsible for the diverse forms of life inhabiting the planet. The evidence for evolution suggests that all living organisms descended from common ancestors.
40.1K
02:54Evolutionary Relationships through Genome Comparisons
5.8K
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...
5.8K
02:31Synteny and Evolution
2.9K
John H. Renwick first coined the term “synteny” in 1971, which refers to the genes present on the same chromosomes, even if they are not genetically linked. The species with common ancestry tend to show conserved syntenic regions. Therefore, the concept of synteny is nowadays used to describe the evolutionary relationship between species.
Around 80 million years ago, the human and mice lineages diverged from the common ancestor. During the course of evolution, the ancestral...
Around 80 million years ago, the human and mice lineages diverged from the common ancestor. During the course of evolution, the ancestral...
2.9K
01:24Eukaryotic Evolution
19.5K
The endosymbiont theory is the most widely accepted theory of eukaryotic evolution; however, its progression is still somewhat debated. According to the nucleus-first hypothesis, the ancestral prokaryote first evolved a membrane to enclose DNA and form the nucleus. Conversely, the mitochondria-first hypothesis suggests that the nucleus was formed after endosymbiosis of mitochondria.
Contrary to the endosymbiont theory, the eukaryote-first hypothesis proposes that the simpler prokaryotic and...
Contrary to the endosymbiont theory, the eukaryote-first hypothesis proposes that the simpler prokaryotic and...
19.5K
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