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関連する概念動画

Changes in the Appendicular Skeleton with Age01:09

Changes in the Appendicular Skeleton with Age

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The upper and lower limb initially develops as a small bulge called a limb bud, which appears on the lateral side of the early embryo. The upper limb bud appears near the end of the fourth week of development, with the lower limb bud appearing shortly after.
Initially, the limb buds consist of a core of mesenchyme covered by a layer of ectoderm. The ectoderm at the end of the limb bud thickens to form a narrow crest called the apical ectodermal ridge. This ridge stimulates the underlying...
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Limits to Natural Selection01:38

Limits to Natural Selection

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Organisms that are well-adapted to their environment are more likely to survive and reproduce. However, natural selection does not lead to perfectly adapted organisms. Several factors constrain natural selection.
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Development of the Limb Synovial Joints01:07

Development of the Limb Synovial Joints

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Joints form during embryonic development in conjunction with the formation and growth of the associated bones. The embryonic tissue that gives rise to all bones, cartilage, and connective tissues of the body is called mesenchyme.
The mesenchymal stem cells differentiate into chondrocytes that form the hyaline cartilage, and later the cartilaginous model of the bone. This model further transforms into a bone. This process is known as endochondral ossification.
During development, the limbs...
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Convergent Evolution01:54

Convergent Evolution

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Evolution shapes the features of organisms over time, ensuring that they are suited for the environments in which they live. Sometimes, selection pressure leads to the rise of similar but unrelated adaptations in organisms with no recent common ancestors, a process known as convergent evolution.
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Gene Duplication and Divergence02:37

Gene Duplication and Divergence

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The seminal work of Ohno in 1970 popularized the idea of gene duplication and divergence. DNA sequence comparison studies reveal that a large portion of the genes in bacteria, archaebacteria, and eukaryotes was  generated by gene duplication and divergence, indicating its critical role in evolution.
The duplicated copies of the gene are called Paralogs. Paralogs with similar sequences and functions form a gene family. Across several species, a large number of gene families are...
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Multi-species Conserved Sequences02:51

Multi-species Conserved Sequences

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Next-generation sequencing technologies have created large genomic databases of a variety of animals and plants. Ever since the human genome project was completed, scientists studied the genome of primates, mammals, and other phylogenetically distant living beings. Such large-scale  studies have provided new insights into the evolutionary relationship between organisms.
Although the genome of each species varies greatly from each other, a few sequences are highly conserved. Such conserved...
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関連する実験動画

Updated: Mar 13, 2026

A Rapid In Vivo Bioassay for Developmentally Active Enhancers
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A Rapid In Vivo Bioassay for Developmentally Active Enhancers

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蛇 の 進化 の 過程 で 肢 の 強化 器 の 機能 の 漸進 的 な 喪失

Evgeny Z Kvon1, Olga K Kamneva2, Uirá S Melo1

  • 1MS 84-171, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.

Cell
|October 22, 2016
PubMed
まとめ

蛇の進化は,ソニック・ヘッジホッグを制御する 肢体強化器の変化を伴う. この増強剤の単一の結合部位を回復し, 完全なる肢体発達を回復し, 制御配列を明らかにした.

キーワード:
CRISPR/Cas9についてソニック・ヘッジホッグ (Shh)ZRS についてシス規制要素強化剤エボ・デボゲノム編集手足の発達形態的進化ヘビ

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Chicken Recombinant Limbs Assay to Understand Morphogenesis, Patterning, and Early Steps in Cell Differentiation
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Generation of Chimeric Axolotls with Mutant Haploid Limbs Through Embryonic Grafting
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Generation of Chimeric Axolotls with Mutant Haploid Limbs Through Embryonic Grafting

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関連する実験動画

Last Updated: Mar 13, 2026

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Chicken Recombinant Limbs Assay to Understand Morphogenesis, Patterning, and Early Steps in Cell Differentiation
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Generation of Chimeric Axolotls with Mutant Haploid Limbs Through Embryonic Grafting
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科学分野:

  • 進化的発達生物学
  • 比較ゲノミクス
  • 分子進化

背景:

  • 体の形状の進化は 規則的な順序の変化と結びついています
  • 主要な脊椎動物の形態学的移行の背後にある分子機構はよく理解されていません.

研究 の 目的:

  • 脊椎動物における主要な形態学的移行を促す分子現象を調査する.
  • ボディプランの進化に関連した規制要素の特定のシーケンス変更を特定します.

主な方法:

  • 保存されたソニック・ヘッジホッグ (Shh) 肢増強剤で特定されたヘビ特有の配列変化.
  • トランスジェニックマウスレポーターアッセイを用いて,インビボで強化剤の活性を調べた.
  • マウスでゲノム置換実験を行いました
  • 複製因子の結合部位を 合成的に回復した.

主要な成果:

  • 肢体増強剤の活動パターンは 魚のような脊椎動物では保たれ 蛇では変化します
  • マウス強化剤をヒトや魚のオルトログに置き換えた結果 義肢は正常に発達した.
  • 強化剤のヘビのオートログはマウスで重度の肢体縮小を引き起こした.
  • 失われたトランスクリプションファクターの結合部位を復元することで,ヘビの強化機能が回復した.

結論:

  • 特定の規制配列の変化は,ヘビのような形態への主要な身体計画移行と関連しています.
  • 強化剤は形態学的進化において 重要な役割を果たします
  • 蛇の四肢の喪失の原因となる 重要な制御メカニズムを特定しました