関連する実験動画
Updated: May 22, 2026
22:27
Hi-C: A Method to Study the Three-dimensional Architecture of Genomes.
Published on: May 6, 2010
ゲノム複合性のエネルギー学について
1Department of Genetics, Evolution and Environment, University College London, Gower Street, London W1E 6BT, UK. nick.lane@ucl.ac.uk
Nature
|October 22, 2010
まとめ
複雑な生命の進化は,真核細胞が原核細胞から発生したことに依存していた. mitochondrial endosymbiosisは,遺伝子発現の大幅な増加を可能にし,真核生物の複雑性を推進しました.
科学分野:
- 細胞生物学 細胞生物学
- 進化生物学の進化生物学について
- ゲノミクスゲノミクスとは
背景:
- すべての複雑な生命は,元々プロカリオットから進化した真核細胞から発生します.
- プロカリオットは,複雑化に向けた進化的進歩が限られている.
- プロカリオットの進化的制約の原因は完全に理解されていません.
研究 の 目的:
- プロカリオットの複雑性を制限するバイオエネルギーとゲノム要因を調査する.
- ユカリオット細胞の進化と複雑性におけるエンドシンバイオシスの役割を明らかにする.
主な方法:
- 比較ゲノミクス分析. 比較ゲノミクス分析.
- バイオエネルギーモデリング.
- 進化の経路の再構築.
主要な成果:
- プロカリオットのゲノムサイズは,基本的にバイオエネルギー的な制限によって制限されています.
- ミトコンドリアのエンドシンバイオシスは,エネルギー産生膜に対するDNA分布を劇的に変化させた.
- この再構築により,ミトコンドリアエネルギーに依存する遺伝子発現能力が20万倍に増加しました.
結論:
- ミトコンドリア内共生は重要な革新であり,真核生物の複雑性に必要なゲノム拡張を可能にしました.
- ミトコンドリアの電力の存在は,複雑な生命と多細胞性の進化の前提条件でした.
関連する概念動画
00:58Genomic DNA in Eukaryotes
Eukaryotes have large genomes compared to prokaryotes. To fit their genomes into a cell, eukaryotic DNA is packaged extraordinarily tightly inside the nucleus. To achieve this, DNA is tightly wound around proteins called histones, which are packaged into nucleosomes that are joined by linker DNA and coil into chromatin fibers. Additional fibrous proteins further compact the chromatin, which is recognizable as chromosomes during certain phases of cell division.
00:58DNA Packaging
Overview
03:21Genome Size and the Evolution of New Genes
While every living organism has a genome of some kind (be it RNA, or DNA), there is considerable variation in the sizes of these blueprints. One major factor that impacts genome size is whether the organism is prokaryotic or eukaryotic. In prokaryotes, the genome contains little to no non-coding sequence, such that genes are tightly clustered in groups or operons sequentially along the chromosome. Conversely, the genes in eukaryotes are punctuated by long stretches of non-coding sequence.
02:21Chromatin Packaging
Each human somatic cell contains 6 billion base-pairs of DNA. Each base-pair is 0.34 nm long, which means that each diploid cell contains a staggering 2 meters of DNA. How is such a long DNA strand packed inside a nucleus measuring only 10 - 20 microns in diameter?
The chromatin
In combination with specialized DNA binding protein called Histones, the DNA double helix forms a compact DNA: protein complex called chromatin. The chromatin itself is further compacted into higher-order structures.
The chromatin
In combination with specialized DNA binding protein called Histones, the DNA double helix forms a compact DNA: protein complex called chromatin. The chromatin itself is further compacted into higher-order structures.
03:21Genome Size and the Evolution of New Genes
While every living organism has a genome of some kind (be it RNA, or DNA), there is considerable variation in the sizes of these blueprints. One major factor that impacts genome size is whether the organism is prokaryotic or eukaryotic. In prokaryotes, the genome contains little to no non-coding sequence, such that genes are tightly clustered in groups or operons sequentially along the chromosome. Conversely, the genes in eukaryotes are punctuated by long stretches of non-coding sequence.
01:32Chromatin Packaging
Each human somatic cell contains 6 billion base pairs of DNA. Each base pair is 0.34 nm long, meaning each diploid cell contains a staggering 2 meters of DNA. This long DNA strand is packed inside a nucleus measuring only 10-20 microns in diameter with the help of specialized DNA-binding proteins called histones. Together they form a compact DNA-protein complex called chromatin. The chromatin is further compacted into higher-order structures. The highest level of compaction is achieved during...