動物の近親のミトーシスの生命周期相関進化
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PubMedで要約を見る
まとめ
この要約は機械生成です。細胞分裂には開いたか閉じたミトーシスを用いる. イチオスポリア種は両方の戦略を示し,多核生命周期が閉じたミトーシスの進化を好むことを示唆しています.
科学分野
- 細胞生物学
- 進化生物学
- ゲノミクス
背景
- 細胞分裂の間,ユーカリオットは2つの主要な核封筒改造戦略を示します.オープンミトーシス (解体) と閉じたミトーシス (核内スパインドル).
- オープンまたは閉じたミトーシスを採用する進化の原動力はほとんど不明である.
- イチオスポリアは動物と真菌に近親であり,初期ユカリオット進化の洞察を提供することで,重要な遺伝学的な位置を占めています.
研究 の 目的
- イチオスポリアが使っている ミトの戦略を調査する
- ユカリオットにおけるミトのメカニズムの分岐に導いた進化的圧力を理解する.
- 特定のライフサイクル戦略 (例えば,多核化) とミト型の進化を相関させる.
主な方法
- イチオスポリア種の比較ゲノム解析
- 超構造画像はミトスの過程を可視化します
- 進化の歴史を再構築するための 系統遺伝分析
主要な成果
- イチオスポリアの種は,真菌のような閉じたミトーシスまたは動物のような開いたミトーシスに偏っている.
- この差異は,異なる細胞状態,特に多核対非核状態の維持と関連しているようです.
- 証拠は多核生命周期と 閉じたミトーシスの進化的選択の間の相関を示唆している.
結論
- ユカリオットのミトーシストラテジーは多様で,基本的生命周期特性に結びついています.
- 多核化は閉じたミトーシスの進化を好む重要な要因である.
- イチオスポリアは,真核生物の細胞分裂メカニズムの進化を理解するためのモデルシステムを提供します.
関連する概念動画
Cell division is necessary for growth and reproduction in organisms. Mitosis aids cell growth and development by dividing somatic cells. In contrast, meiosis causes the division of germ cells and plays an essential role in sexual reproduction. Due to their unique functional requirements, mitosis and meiosis differ from each other in multiple aspects.
Before the start of mitosis and meiosis I, the cell synthesizes DNA, resulting in two homologous copies of each chromosome. DNA synthesis is...
In eukaryotes, the cell division cycle is divided into distinct, coordinated cellular processes that include cell growth, DNA replication/chromosome duplication, chromosome distribution to daughter cells, and finally, cell division. The cell cycle is tightly regulated by its regulatory systems as well as extracellular signals that affect cell proliferation.
The processes of the cell cycle occur over approximately 24 hours (in typical human cells) and in two major distinguishable stages. The...
Meiosis II entails cell division and segregation of the sister chromatids, resulting in the production of four unique haploid gametes. The steps for meiosis II are similar to mitosis, except that meiosis II occurs in haploid cells, whereas mitosis occurs in diploid cells.
The timing and cell division patterns of meiosis differ between males and females. In male meiosis, the centrosomes are part of the formation of the meiotic spindle. However, in oocytes, including that of humans, Drosophila,...
Most animal cells comprise a pair of centrioles together called a centrosome. The cell duplicates its centrosome and contains two centrosomes side-by-side, which begin to move apart during the prophase. As the centrosomes migrate to two different sides of the cell, microtubules start extending from each centrosome toward the other end. The mitotic spindle is composed of the centrosomes and their emerging microtubules.
Near the end of the prophase, also called late prophase or...
Meiosis is a carefully orchestrated set of cell divisions, the goal of which—in humans—is to produce haploid sperm or eggs, each containing half the number of chromosomes present in somatic cells elsewhere in the body. Meiosis I is the first such division, and involves several key steps, among them: condensation of replicated chromosomes in diploid cells; the pairing of homologous chromosomes and their exchange of information; and finally, the separation of homologous chromosomes by...
John H. Renwick first coined the term “synteny” in 1971, which refers to the genes present on the same chromosomes, even if they are not genetically linked. The species with common ancestry tend to show conserved syntenic regions. Therefore, the concept of synteny is nowadays used to describe the evolutionary relationship between species.
Around 80 million years ago, the human and mice lineages diverged from the common ancestor. During the course of evolution, the ancestral...