関連する実験動画
Updated: May 5, 2026

12:02
Molecular Evolution of the Tre Recombinase
Published on: May 29, 2008
9.3K
選択は遺伝子の流れを覆し,適応不良のミミクリを分解する.
George R Harper1, David W Pfennig
1Department of Biology, University of North Carolina, Chapel Hill, North Carolina 27599, USA.
Nature
|February 29, 2008
まとめ
無害な種が危険な種を模倣するバテシアン模倣は,男性主導の移住のために危険なモデルのない地域でも起こり得る. しかし,自然選択はこれらの領域における非模倣的特性を好み,遺伝子フローを優先する.
科学分野:
- 進化生物学の進化生物学について
- エコロジー エコロジー エコロジー
- 行動生態学 行動生態学
背景:
- バテシアン模倣は,食欲のある種が危険な種を模倣して捕食者を抑止することを意味します.
- ミミックは,危険なモデル種の存在 (シンパトリ) がある場合にのみ発生することが予想されます.
- モデルのない地域 (アロパトリー) でミミックの存在は,この期待に異議を唱える.
研究 の 目的:
- アロパトリにおけるバテシアン模倣の背後にある進化的および遺伝的メカニズムを調査する.
- 珊瑚ヘビの存在を説明するために,珊瑚ヘビが欠けている地域では,サンゴヘビの模倣をします.
- ミミクリーの維持における遺伝子フローと自然選択の相互作用を理解する.
主な方法:
- 人口間の遺伝子フローを研究するために,間接的なDNAベースの方法を利用しました.
- 核およびミトコンドリアDNAの遺伝子フローを比較して,性バイアス分散を推論した.
- シンパトリックとアロパトリックの集団間の真似における現象的差異を分析した.
主要な成果:
- 証拠によると,ミミックはシンパトリックからアロパトリックの領域に移住する.
- 遺伝子フローは,核遺伝子がミトコンドリア遺伝子よりも著しく高く,男性の分散を示しています.
- アロパトリック模倣は,シンパトリック模倣と比較してモデルとの類似性が低下しています.
結論:
- 男性媒介の遺伝子フローは,アロパトリにおけるバテシアン模倣の発生を説明することができます.
- 肉食動物による自然選択は,アロパトリにおける模倣的現象型に対して作用する.
- 自然選択は遺伝子フローを覆し,アロパトリック集団における非模倣性特性の進化につながる.
さらに関連する動画
11:35Selection-dependent and Independent Generation of CRISPR/Cas9-mediated Gene Knockouts in Mammalian Cells
Published on: June 16, 2017
12.0K
10:57CRISPR/Cas9-Mediated Highly Efficient Gene Targeting in Embryonic Stem Cells for Developing Gene-Manipulated Mouse Models
Published on: August 24, 2022
4.6K
関連する概念動画
Mismatch Repair
38.1K
Overview
38.1K
In-vitro Mutagenesis
14.8K
To learn more about the function of a gene, researchers can observe what happens when the gene is inactivated or “knocked out,” by creating genetically engineered knockout animals. Knockout mice have been particularly useful as models for human diseases such as cancer, Parkinson’s disease, and diabetes.
14.8K
Gene Conversion
9.2K
Other than maintaining genome stability via DNA repair, homologous recombination plays an important role in diversifying the genome. In fact, the recombination of sequences forms the molecular basis of genomic evolution. Random and non-random permutations of genomic sequences create a library of new amalgamated sequences. These newly formed genomes can determine the fitness and survival of cells. In bacteria, homologous and non-homologous types of recombination lead to the evolution of new...
9.2K
Nonsense-mediated mRNA Decay
9.4K
The Upf proteins that carry out nonsense-mediated decay (NMD) are found in all eukaryotic organisms, including humans. Each protein has an individual role, but they need to work in collaboration. Upf1 is an ATP-dependent RNA helicase that unwinds the RNA helix. Because Upf1 can unwind any RNA, Upf2 and Upf3 are required to help Upf1 discriminate between nonsense and normal mRNAs.
Usually, Upf3 binds to an Exon Junction Complex (EJC) at mRNA splice sites. If a ribosome fully translates the mRNA,...
Usually, Upf3 binds to an Exon Junction Complex (EJC) at mRNA splice sites. If a ribosome fully translates the mRNA,...
9.4K
Exon Recombination
3.1K
The evolution of new genes is critical for speciation. Exon recombination, also known as exon shuffling or domain shuffling, is an important means of new gene formation. It is observed across vertebrates, invertebrates, and in some plants such as potatoes and sunflowers. During exon recombination, exons from the same or different genes recombine and produce new exon-intron combinations, which might evolve into new genes.
Exon shuffling follows “splice frame rules.” Each exon...
Exon shuffling follows “splice frame rules.” Each exon...
3.1K
Mismatch Repair
5.4K
Organisms are capable of detecting and fixing nucleotide mismatches that occur during DNA replication. This sophisticated process requires identifying the new strand and replacing the erroneous bases with correct nucleotides. Mismatch repair is coordinated by many proteins in both prokaryotes and eukaryotes.
The Mutator Protein Family Plays a Key Role in DNA Mismatch Repair
The human genome has more than 3 billion base pairs of DNA per cell. Prior to cell division, that vast amount of genetic...
The Mutator Protein Family Plays a Key Role in DNA Mismatch Repair
The human genome has more than 3 billion base pairs of DNA per cell. Prior to cell division, that vast amount of genetic...
5.4K