関連する実験動画
Updated: Apr 11, 2026
12:11
Methodology for Accurate Detection of Mitochondrial DNA Methylation
Published on: May 20, 2018
14.0K
2つの絶滅したモアの完全なミトコンドリアゲノム配列は,ラタイト類の進化を明らかにしています.
A Cooper1, C Lalueza-Fox, S Anderson
1Department of Biological Anthropology and Henry Wellcome Ancient Biomolecules Centre, University of Oxford, UK. alan.cooper@zoo.ox.ac.uk
Nature
|February 24, 2001
まとめ
古代の鳥のDNAは,クレタセオ後期にラチトが分裂し,プレート構造を支えたことを明らかにしています.
科学分野:
- 進化生物学の進化生物学について
- 分子系遺伝学 分子系遺伝学
- パレオジオグラフィー パレオジオグラフィー
背景:
- ラチット (大型の飛べない鳥) とその飛ぶ親類 (チナムス) の起源と多様化は,鳥類の進化とプレート構造が生物地理学に与える影響を理解するために極めて重要です.
- ラタイト類の分岐の正確な年代測定は,現代の鳥類の進化のタイムラインを確立するために不可欠です.
研究 の 目的:
- ラタイト類とその姉妹種であるタナムス類の系統を解明する.
- 鳥類の分布におけるプレート構造の役割を調査するために生物地理学的データを提供すること.
- 主要な鳥類群の分子分岐日付を確立する.
主な方法:
- 絶滅した2つのニュージーランドモア属のミトコンドリアゲノムの完全な配列を解析.
- 絶滅したマダガスカルゾウ鳥のミトコンドリアDNAの配列解析.
- 既存のキウィ,カズワリー,エミュ,および2つのティナモウ属から広範な配列データ (12キロベース) を生成しました.
主要な成果:
- 統計的に正確な分子分岐日付は,大規模で包括的なデータセットを使用して推定されました.
- この結果は,クレタセオ後期におけるラチト類の属種のヴァカリアント種化イベントを裏付けている.
- 証拠によると,キウイは後にニュージーランドに散らばったという.
結論:
- この研究は,ゴンドワナ超大陸の崩壊に関する最初の分子洞察を提供します.
- 他のゴンドワナのバイオタにおける種化イベントのための新しい時間的枠組みが確立される.
- この発見は,鳥類の多様化に関する競合する生物地理的仮説を評価するための基礎を提供する.
関連する概念動画
01:54Convergent Evolution
34.6K
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.
34.6K
02:59Animal Mitochondrial Genetics
10.1K
Among all the organelles in an animal cell, only mitochondria have their own independent genomes. Animal mitochondrial DNA is a double-stranded, closed-circular molecule with around 20,000 base pairs. Mitochondrial DNA is unique in that one of its two strands, the heavy, or H, -strand is guanine rich, whereas the complementary strand is cytosine rich and called the light, or L, -strand. Compared to nuclear DNA, mitochondrial DNA has a very low percentage of non-coding regions and is marked by...
10.1K
02:31Synteny and Evolution
4.0K
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...
4.0K
02:51Multi-species Conserved Sequences
4.9K
Next-generation sequencing technologies have created large genomic databases of a variety of animals and plants. Ever since the human genome project was completed, scientists studied the genome of primates, mammals, and other phylogenetically distant living beings. Such large-scale studies have provided new insights into the evolutionary relationship between organisms.
Although the genome of each species varies greatly from each other, a few sequences are highly conserved. Such conserved...
Although the genome of each species varies greatly from each other, a few sequences are highly conserved. Such conserved...
4.9K
01:29Modern Molecular Taxonomy
844
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...
844
01:08Evolution of Microbial Genome
56
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.
56