関連する実験動画
Updated: May 10, 2026
15:01
Dissection of Oenocytes from Adult Drosophila melanogaster
Published on: July 19, 2010
脂肪酸アシル還元酵素遺伝子のアレル変異は,の性フェロモンの分岐を引き起こします
Jean-Marc Lassance1, Astrid T Groot, Marjorie A Liénard
1Department of Biology, Lund University, 22362 Lund, Sweden.
Nature
|July 2, 2010
まとめ
脂肪アシル還元酵素遺伝子の遺伝的変異は,ヨーロッパのトウモロコシの種で異なる性フェロモン混合を駆動する. 化学的なコミュニケーションのこの違いは,繁殖的孤立と蝶の潜在的な種化に鍵を握っています.
科学分野:
- 進化遺伝学の進化遺伝学について
- 化学エコロジー 化学エコロジー
- 動物の行動について
背景:
- フェロモンは動物のコミュニケーションと繁殖に不可欠であり,その違いはしばしば繁殖の孤立を促す.
- フェロモンの進化の遺伝的基礎と,その種の形成における役割は,特にレピドプテラでは,ほとんど未知のままである.
研究 の 目的:
- 欧州のトウモロコシシ (Ostrinia nubilalis) の人種特有の性フェロモン産生を支える遺伝的メカニズムを特定する.
- フェロモンベースの生殖的孤立と種化における遺伝子進化の役割を調査する.
主な方法:
- フェロモン生物合成に関与する遺伝子のアレル変異の分析.
- 酵素分析は,フェロモン産生酵素の基板特異性を決定する.
- 異なるOstrinia nubilalis種のフェロモン混合物のフェノタイプ分析.
主要な成果:
- 脂肪アシル還元酵素遺伝子のアレル変異は,女性の性フェロモン産生における差異と直接相関しています.
- ZおよびEアレルによってコードされる酵素は,基板特異性を示し,フェロモン同位体比が異なっている.
- この遺伝的変異は,人種特有のフェロモン信号を確立し,重要な生殖孤立を引き起こします.
結論:
- 単一の脂肪アシル還元酵素遺伝子の進化的多様化は,フェロモン差異とOstrinia nubilalisの生殖的孤立の原因である.
- この研究は,蝶の種内生殖隔離に寄与する遺伝子の最初の機能的特徴付けを提供します.
- 生物合成酵素の進化的変化は,変化した化学通信信号を通して,種種化を促すことができる.
関連する概念動画
01:19X-linked Traits
In most mammalian species, females have two X sex chromosomes and males have an X and Y. As a result, mutations on the X chromosome in females may be masked by the presence of a normal allele on the second X. In contrast, a mutation on the X chromosome in males more often causes observable biological defects, as there is no normal X to compensate. Trait variations arising from mutations on the X chromosome are called “X-linked”.
02:32Position-effect Variegation
In 1928, a German botanist Emil Heitz observed the moss nuclei with a DNA binding dye. He observed that while some chromatin regions decondense and spread out in the interphase nucleus, others do not. He termed them euchromatin and heterochromatin, respectively. He proposed that the heterochromatin regions reflect a functionally inactive state of the genome. It was later confirmed that heterochromatin is transcriptionally repressed, and euchromatin is transcriptionally active chromatin.
02:27Background and Environment Affect Phenotype
Although the genetic makeup of an organism plays a major role in determining the phenotype, there are also several environmental factors, such as temperature, oxygen availability, presence of mutagens, that can alter an organism’s phenotype.
An example of how genetic background affects phenotype can be seen in horses. The Extension gene in horses is responsible for their coat color. A wild-type gene (EE) produces black pigment in the coat, while a mutant gene (ee) produces red pigment. A...
An example of how genetic background affects phenotype can be seen in horses. The Extension gene in horses is responsible for their coat color. A wild-type gene (EE) produces black pigment in the coat, while a mutant gene (ee) produces red pigment. A...
02:45The Ratio of X Chromosome to Autosomes
In most organisms, sex is determined by the ratio of X and Y chromosomes. However, in some organisms, such as Drosophila and C.elegans, sex is determined by the ratio of the number of X chromosomes to the number of sets of autosomes. The Y chromosome in Drosophila is active but does not determine sex. It contains genes responsible for the production of sperms in adult flies.
Normal male Drosophila has a ratio of one X chromosome to two sets of autosomes. In contrast, normal female Drosophila...
Normal male Drosophila has a ratio of one X chromosome to two sets of autosomes. In contrast, normal female Drosophila...
02:50Dosage Compensation
In animals, gender is determined by the number and type of sex chromosome. For example, human females have two X chromosomes, and males have one X and one Y chromosome, whereas C.elegans with one X chromosome is a male, and the one with two X chromosomes is a hermaphrodite.
In addition to sexual development, the X chromosome has genes involved in autosomal functions such as brain development and the immune system. Therefore, males and females with distinct numbers of X chromosomes will have...
In addition to sexual development, the X chromosome has genes involved in autosomal functions such as brain development and the immune system. Therefore, males and females with distinct numbers of X chromosomes will have...
02:32Exon Recombination
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 has three reading...
Exon shuffling follows “splice frame rules.” Each exon has three reading...