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Gene Conversion02:08

Gene Conversion

9.7K
Other than maintaining genome stability via DNA repair, homologous recombination plays an important role in diversifying the genome. In fact, the recombination of sequences forms the molecular basis of genomic evolution. Random and non-random permutations of genomic sequences create a library of new amalgamated sequences. These newly formed genomes can determine the fitness and survival of cells. In bacteria, homologous and non-homologous types of recombination lead to the evolution of new...
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Genome Copying Errors02:46

Genome Copying Errors

4.2K
DNA replication is a well-evolved process that copies millions of base pairs with high fidelity during each cell division. Occasionally a wrong base or a long stretch of wrong bases may get added to the daughter strands. If the errors are left unchecked, cells might accumulate several mutations that might endanger their  survival. Therefore, the copying errors are checked and repaired at three levels.
4.2K
Gene Duplication and Divergence02:37

Gene Duplication and Divergence

6.1K
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...
6.1K
Mutations01:35

Mutations

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Mutations are changes in the sequence of DNA. These changes can occur spontaneously or they can be induced by exposure to environmental factors. Mutations can be characterized in a number of different ways: whether and how they alter the amino acid sequence of the protein, whether they occur over a small or large area of DNA, and whether they occur in somatic cells or germline cells.
Chromosomal Alterations Are Large-Scale Mutations
While point mutations are changes in a single nucleotide in...
35.4K
Gene Families01:57

Gene Families

8.8K
Gene families consist of groups of genes proposed to have originated from a common ancestor. Typically these arise through events in which a gene or genes are mistakenly duplicated during cell division. Unlike their parent genes (which are subject to selection pressure to maintain function), these gene copies do not need to preserve their sequences and may evolve at a relatively faster rate.
Occasionally these regions can be adapted to take on new roles within the organism, becoming novel genes...
8.8K
Exon Recombination02:32

Exon Recombination

3.6K
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...
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Following the Dynamics of Structural Variants in Experimentally Evolved Populations
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補償変異は,遺伝子複製による建設的中性進化を強化する.

Philippe C Després1,2,3,4, Alexandre K Dubé1,2,3,4,5, Marie-Ève Picard1,2,3

  • 1Département de Biochimie, de Microbiologie et de Bio-informatique, Faculté des Sciences et de Génie Université Laval, Québec, QC G1V 0A6, Canada.

Science (New York, N.Y.)
|August 15, 2024
PubMed
まとめ

遺伝子の複製は,正の選択なしに新しいタンパク質の機能につながる. 複製された遺伝子の有害な変異は補償され,建設的中性進化を通じて機能的なタンパク質複合体を形成することができる.

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Author Spotlight: Identifying Compensatory Pathways in Malaria Parasites Containing Hypomorphic Allele of Essential Protein Kinases
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In Vivo Modeling of the Morbid Human Genome using Danio rerio
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In Vivo Modeling of the Morbid Human Genome using Danio rerio

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関連する実験動画

Last Updated: Jun 16, 2025

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科学分野:

  • 進化生物学
  • 分子生物学
  • タンパク質の生化学

背景:

  • タンパク質の機能は 複雑な組み立てに依存しています
  • ホモマーからヘテロマーへの進化的移行は,遺伝子複製によって起こります.
  • 分子間補償変異は 適応的進化なしに これらの移行を促すことができます

研究 の 目的:

  • ホモディメア酵素からヘテロメア複合体の進化を実験的に調査する.
  • 遺伝子の複製に続く有害な突然変異が 新しい機能的複合体につながるかどうかを判断する.
  • 建設的中立進化の基礎となるメカニズムを理解する

主な方法:

  • ホモディメア酵素の実験的な遺伝子複製と進化.
  • ホモジマーとヘテロマーの機能に影響する変異の分析.
  • 新しい異体複合体の構造的決定.

主要な成果:

  • 何百もの有害な変異が特定され 個々のホモダイマーを無効化する.
  • これらの変異は,複製されたタンパク質の共発現と異体化によって,機能的な酵素を生成した.
  • 構造分析により,機能喪失を緩衝するアシンメトリー変異が判明し,サブ機能化が可能になった.

結論:

  • 遺伝子の複製に続く有害な変異は,機能的な異体複合体の形成につながる可能性があります.
  • 補償性突然変異によって駆動される適応的進化なしに,建設的中性進化は起こり得る.
  • タンパク質複合体の進化は,構造的非対称性によって促進されるサブ機能化によって進行することができる.