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関連する概念動画

Position-effect Variegation02:32

Position-effect Variegation

In 1928, a German botanist Emil Heitz observed the moss nuclei with a DNA binding dye. He observed that while some chromatin regions decondense and spread out in the interphase nucleus, others do not. He termed them euchromatin and heterochromatin, respectively. He proposed that the heterochromatin regions reflect a functionally inactive state of the genome. It was later confirmed that heterochromatin is transcriptionally repressed, and euchromatin is transcriptionally active chromatin.
Gene Conversion02:08

Gene Conversion

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...
Overview of Transposition and Recombination02:13

Overview of Transposition and Recombination

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...
Gene Conversion02:08

Gene Conversion

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...
Transposons01:24

Transposons

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...
Horizontal Gene Transfer01:27

Horizontal Gene Transfer

Horizontal gene transfer (HGT) is a process where genetic material moves between organisms within the same generation, unlike vertical gene transfer, which occurs from parent to offspring. HGT plays a crucial role in microbial evolution, adaptation, and survival, particularly in shared environments like the human gut.Mobile genetic elements such as plasmids, prophages, integrons, insertion sequences, and transposons facilitate this process. HGT occurs through three primary mechanisms:...

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関連する実験動画

Updated: Jul 9, 2026

Analysis of LINE-1 Retrotransposition at the Single Nucleus Level
11:52

Analysis of LINE-1 Retrotransposition at the Single Nucleus Level

Published on: April 23, 2016

遺伝学. 遺伝学について. トランポゾンは,ダイナミックなゲノムを彫刻するのに役立ちます.

A S Moffat

    Science (New York, N.Y.)
    |September 19, 2000
    PubMed
    まとめ

    トランポゾンと呼ばれる移動性遺伝子要素は,単に拡大ではなく,DNAの損失を含む,重要なゲノム再編成を引き起こします. これらの急速なゲノム変化は,生物の適応を促す可能性があります.

    科学分野:

    • ゲノミクスゲノミクスとは
    • 分子生物学は分子生物学である.
    • 進化生物学の進化生物学について

    背景:

    • トランポゾンとして知られる移動性遺伝子要素は,約20年間,ゲノム拡張と重複性DNA配列に寄与することが理解されています.
    • これまでの研究は,主にゲノムサイズを増大させるトランポゾンの役割に焦点を当てていた.

    研究 の 目的:

    • トランポゾンによって引き起こされるゲノム再構成の全範囲を調査する.
    • DNA膨張に加えて,トランポゾンがDNA喪失に寄与するかどうかを決定する.
    • トランポゾン誘発のゲノム変化の速度と適応的重要性を評価する.

    主な方法:

    • トランポゾン活動を特定し,定量化するためのゲノム分析技術.
    • 進化の時間スケールにおける変化を評価するための比較ゲノミクス.
    • トランポゾン媒介による再編成が生物の適応に与える影響を評価するための機能分析.

    主要な成果:

    • トランポゾンは,これまで認識されていたよりも,より広範なゲノム再構成を誘導します.
    • ゲノム拡張を超えて,トランポゾンは実質的なDNA損失に大きく貢献します.
    • トランポゾンによって媒介されるこれらのゲノム変異は,進化のスケールで急速に発生します.

    さらに関連する動画

    Cell Lineage Analyses and Gene Function Studies Using Twin-spot MARCM
    06:30

    Cell Lineage Analyses and Gene Function Studies Using Twin-spot MARCM

    Published on: March 2, 2017

    An Efficient Strategy for Generating Tissue-specific Binary Transcription Systems in Drosophila by Genome Editing
    10:01

    An Efficient Strategy for Generating Tissue-specific Binary Transcription Systems in Drosophila by Genome Editing

    Published on: September 19, 2018

    関連する実験動画

    Last Updated: Jul 9, 2026

    Analysis of LINE-1 Retrotransposition at the Single Nucleus Level
    11:52

    Analysis of LINE-1 Retrotransposition at the Single Nucleus Level

    Published on: April 23, 2016

    Cell Lineage Analyses and Gene Function Studies Using Twin-spot MARCM
    06:30

    Cell Lineage Analyses and Gene Function Studies Using Twin-spot MARCM

    Published on: March 2, 2017

    An Efficient Strategy for Generating Tissue-specific Binary Transcription Systems in Drosophila by Genome Editing
    10:01

    An Efficient Strategy for Generating Tissue-specific Binary Transcription Systems in Drosophila by Genome Editing

    Published on: September 19, 2018

    結論:

    • トランポゾンは,膨張と収縮の両方を通じてゲノム構造を形作る上で重要な役割を果たします.
    • トランスポゾン活動のダイナミックな性質は,生物の急速な適応のための重要なメカニズムを示唆しています.
    • トランポゾン機能に関するさらなる研究は,ゲノムの進化と適応を理解するために不可欠です.