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関連する概念動画

Genome Size and the Evolution of New Genes03:21

Genome Size and the Evolution of New Genes

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While every living organism has a genome of some kind (be it RNA, or DNA), there is considerable variation in the sizes of these blueprints. One major factor that impacts genome size is whether the organism is prokaryotic or eukaryotic. In prokaryotes, the genome contains little to no non-coding sequence, such that genes are tightly clustered in groups or operons sequentially along the chromosome. Conversely, the genes in eukaryotes are punctuated by long stretches of non-coding sequence.
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Conservative Site-specific Recombination and Phase Variation02:53

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Because the DNA segments are cut and reorganized in a direction-specific manner, site-specific recombination has emerged as an efficient genetic engineering technique. Flippase and Cyclization recombinases or Flp and Cre, respectively, are two members of the tyrosine recombinase family derived from bacteriophages, that are used to mediate site-specific DNA insertions, deletions, and targeted expression of proteins in mammalian cell lines.
The recognition sites for Cre recombinase called LoxP...
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Exon Recombination02:32

Exon Recombination

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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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DNA-only Transposons02:57

DNA-only Transposons

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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...
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Overview of Transposition and Recombination02:13

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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...
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Gene Duplication and Divergence02:37

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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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Updated: Jun 12, 2025

Determination of the Optimal Chromosomal Locations for a DNA Element in Escherichia coli Using a Novel Transposon-mediated Approach
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内遺伝的DNAの逆転により,細菌のコーディング能力が拡張される.

Rachael B Chanin1, Patrick T West1, Jakob Wirbel1

  • 1Department of Medicine, Division of Hematology, Stanford University, Stanford, CA, USA.

Nature
|September 25, 2024
PubMed
まとめ

細菌は DNAの逆転という 段階変化と呼ばれるプロセスを用いて 多様性を生み出します 研究者らは遺伝子の内部で新しい内遺伝的インバートンを発見し,ゲノムサイズを増やさずに細菌のタンパク質の多様性を拡大した.

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Determination of the Optimal Chromosomal Locations for a DNA Element in Escherichia coli Using a Novel Transposon-mediated Approach
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科学分野:

  • 微生物学
  • ゲノミクス
  • バイオ情報学

背景:

  • 細菌集団は相変化のようなメカニズムにより,厳格なクローナリティではなく,異質性を示す.
  • DNAの逆転によってしばしば媒介される相変異は遺伝子発現を変化させ,細菌の健康と生存に影響を与えます.
  • DNAの逆転は プロモーターの方向性を反転させ 遺伝子転写を制御します

研究 の 目的:

  • ロングリードシーケンシングデータにおけるDNAの逆転を特定するための計算ツール (PhaVa) を開発する.
  • 遺伝子の内部にある"イントラジェニック・インバートン"と呼ばれる新種のDNAの逆転を発見し,特徴づけること.

主な方法:

  • DNA逆転検出のためのPhaVa計算ツールの開発.
  • バクテリアと古生物の単離から長時間読み取りのシーケンシングデータセットの分析.
  • 特定された内遺伝子インバートンの実験的検証 *Bacteroides thetaiotaomicron*.

主要な成果:

  • 多様な細菌と古生物のゲノムにわたる372の新型内遺伝的インバートンの特定.
  • 内遺伝的インバートンが,内部DNA配列を反転させることで,複数のタンパク質の変異をコードすることを可能にすることを示した.
  • 十の内遺伝的インバートンの実験的検証と1つのthiC遺伝子の特徴づけ.

結論:

  • イントラジェニック・インバートンは重要な発見であり,細菌のゲノムのコーディング能力を拡張しています.
  • PhaVaはDNAの逆転を特定するための貴重なツールであり,バクテリアのゲノムダイナミクスに関するさらなる研究を促進します.
  • このメカニズムは細菌にタンパク質の多様性を生み出し 環境の変化に適応するための新しい戦略を提供します