関連する実験動画
Updated: Jul 10, 2026
08:30
RNAi Interference by dsRNA Injection into Drosophila Embryos
Published on: April 11, 2011
まとめ
ドロソフィラ・メラノガスターの雄のrDNA拡大は,rDNAの遺伝的変化を伴う. この研究では,rDNA単位の選択的な増幅は見つかりませんでしたが,ボブドのオスの初期の世代では一時的なrDNA増幅が観察されました.
科学分野:
- 遺伝学 遺伝学とは
- 分子生物学は分子生物学である.
- 発達生物学 発達生物学について
背景:
- rDNA増幅は,Drosophila melanogasterのオスにおけるリボソームDNAの含有量を変化させる遺伝的プロセスである.
- この現象は,rDNA欠乏の染色体が世代を重ねて結合すると起こります.
研究 の 目的:
- ドロソフィラ・メラノガスターのrDNA増幅の分子メカニズムを調査する.
- 拡大中のrDNA単位と関連する挿入配列の増幅パターンを分析する.
主な方法:
- 拡大X染色体からのrDNAのリストリクションエンドヌクレアゼ分裂分析.
- 南部のハイブリダイゼーションで,rDNAとタイプI挿入要素の分布とコピー番号を調査する.
- 男性の子孫を拡大する複数の世代におけるrDNA含有量の分析.
主要な成果:
- 増幅中に不中断または中断されたrDNA単位の選択的な増幅の証拠はありません.
- ボブドの男性の子孫の第1世代におけるrDNAの一時的な増幅は,野生型のレベルを超えています.
- タンデム配列で見られるタイプIrDNA挿入要素も,初期の世代で一時的な増幅を示した.
結論:
- rDNA増幅は,特定のrDNAユニットタイプの選択的な増幅を伴わない.
- 観察されたrDNA増幅は一時的で,初期の世代でピークに達し,野生型のレベルに戻ります.
- ヘテロクロマチンのタイプI挿入エレメントは,同様の一時的な増幅パターンを示しています.
関連する概念動画
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...