ドロソフィラ・ビリリス (Drosophila virilis) のゲノム進化の原動力として移植可能な要素
Alexander P Rezvykh1, Dina A Kulikova2, Elena S Zelentsova1
1Engelhardt Institute of Molecular Biology of Russian Academy of Sciences, Moscow 119991, Russia.
Nucleic acids research
|February 17, 2026
まとめ
トランスポーザブル要素 (TEs) は,ドロソフィラ・ヴァリリスのゲノムに関するイノベーションを推進しています. これらの移動性遺伝的要素は,ダイナミックな活動,水平的移転を示し,遺伝子調節と進化に影響を与えます.
科学分野:
- ゲノミクスゲノミクスとは
- 進化生物学の進化生物学について
- 分子生物学は分子生物学である.
背景:
- 移植可能要素 (TEs) は,ゲノム技術革新の主要な原動力ですが,非モデル生物におけるそれらの動態は十分に理解されていません.
- ドロソフィラ・ビリリス (Drosophila virilis) は,重複性DNAと転置性元素の研究に役立つモデルシステムである.
研究 の 目的:
- 統合されたマルチオミックスのデータを用いて,Drosophila virilisの転置可能な元素の動態を調査する.
- TEsがゲノム進化,遺伝子調節,D. virilis.の種化に及ぼす影響を理解する.
主な方法:
- マルチオミックデータの統合 (ゲノム,エピゲノム).
- 変換可能な元素ファミリーの計算による予測と手動によるキュレーション.
- エピジェネティックプロファイリング (H3K9me3) とTE挿入部位の分析とその遺伝子発現への影響.
主要な成果:
- 近年,種種関連,古代の3つの異なる動員波を持つ100の転置可能な元素ファミリーを特定しました.
- ユークロマチンとヘテロクロマチンのダイナミックなTEコロニー化が実証され,一部のTEは株特異的な活性を示しています.
- D. virilis の種群の中で TE の水平移転の証拠を提供し, TE "生態系"を形成しました.
- TEsから広がるH3K9me3は,距離に依存した方法で隣接する遺伝子を抑制し,遺伝子調節に影響を及ぼします.
- レトロトランスポゾンに関連したD. virilisにおける最初の自発的な多形逆転を発見した.
結論:
- 移植可能な要素は,ゲノム革新とドロソフィラ・ヴァリリスの進化軌跡の重要な原動力である.
- TEsは,表遺伝的メカニズムを通じて遺伝子調節に積極的に影響し,ゲノムの構造的変異に寄与します.
- この研究は,TEダイナミクスとその影響が様々な動物種のゲノム進化に及ぼす影響を理解するための枠組みを提供します.
関連する概念動画
Overview of Transposition and Recombination
19.4K
Transposons make up a significant part of genomes of various organisms. Therefore, it is believed that transposition played a major evolutionary role in speciation by changing genome sizes and modifying gene expression patterns. For example, in bacteria, transposition can lead to conferring antibiotic resistance. Movement of transposable elements within the genetic pool of pathogenic bacteria can aid in transfer of antibiotic-resistant genetic elements. In eukaryotes, transposons can carry out...
19.4K
DNA-only Transposons
17.6K
DNA-only transposons are called autonomous transposons since they code for the enzyme transposase that is required for the transposition mechanism. Insertion of transposons can alter gene functions in multiple ways. They can mutate the gene, alter gene expression by introducing a novel promoter or insulator sequence, introduce new splice sites, and change the mRNA transcripts produced, or remodel chromatin structure.
The donor site from where the transposon is excised is either degraded or...
The donor site from where the transposon is excised is either degraded or...
17.6K
LTR Retrotransposons
19.8K
LTR retrotransposons are class I transposable elements with long terminal repeats flanking an internal coding region. These elements are less abundant in mammals compared to other class I transposable elements. About 8 percent of human genomic DNA comprises LTR retrotransposons. Some of the common examples of LTR retrotransposons are Ty elements in yeast and Copia elements in Drosophila.
The internal coding region of LTR retrotransposons and their mechanism of transposition closely resembles a...
The internal coding region of LTR retrotransposons and their mechanism of transposition closely resembles a...
19.8K
Transposons
2.1K
Transposons, or "jumping genes," are small mobile genetic elements (MGEs) that range from 700 to 40,000 base pairs in length. They are found in all organisms and can move within the same chromosome or transfer to different chromosomes. In some cases, transposons can also jump between different host DNA molecules, such as plasmids or viruses, contributing to genetic variability.Barbara McClintock first discovered these mobile genetic elements in the 1940s while studying maize genetics, and she...
2.1K
Exon Recombination
4.2K
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...
4.2K
Non-LTR Retrotransposons
13.5K
As the name suggests, non-LTR retrotransposons lack the long terminal repeats characteristic of the LTR retrotransposons. Additionally, both LTR and non-LTR retrotransposons use distinct mechanisms of mobilization. Non-LTR retrotransposons are further divided into two classes - Long interspersed nuclear elements (LINEs) and short interspersed nuclear elements (SINEs), both of which occur abundantly in most mammals, including humans. Some of the active non-LTR retrotransposons in humans are L1...
13.5K


