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関連する概念動画

Chromosome Structure02:40

Chromosome Structure

A functional eukaryotic chromosome must contain three elements: a centromere, telomeres, and numerous origins of replication.
The centromere is a DNA sequence that links sister chromatids. This is also where kinetochores, protein complexes to which spindle microtubules attach, are constructed after the chromosome is replicated. The kinetochores allow the spindle microtubules to move the chromosomes within the cell during cell division.
Telomeres consist of non-coding repetitive nucleotide...
X and Y Chromosomes02:32

X and Y Chromosomes

Among mammals, the gender of an organism is determined by the sex chromosomes. Humans have two sex chromosomes, X and Y. Every human diploid cell has 22 pairs of autosomes and one pair of sex chromosomes. A human female has two X chromosomes, while a male has one X chromosome and one Y chromosome.
The germline cells such as egg and sperm cells carry only half the number of chromosomes, i.e., 22 autosomes and one sex chromosome. All eggs have an X chromosome, while sperm cells can carry an X or...
The Y Chromosome Determines Maleness02:19

The Y Chromosome Determines Maleness

The Y chromosome is a sex chromosome found in several vertebrates and mammals, including humans. In addition to 22 pairs of autosomes, the human males have one X chromosome and one Y chromosome. In these organisms, the presence or absence of the Y chromosome determines the development of male traits.
Evolution
Around 300 million years ago, the two sex chromosomes diverged from two identical autosomal chromosomes. Over time, the Y chromosome has lost most of its genes, shrinking in size. Today,...
Synteny and Evolution02:31

Synteny and Evolution

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 chromosome underwent...
Exon Recombination02:32

Exon Recombination

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 has three reading...
Chromosome Structure02:40

Chromosome Structure

A functional eukaryotic chromosome must contain three elements: a centromere, telomeres, and numerous origins of replication.
The centromere is a DNA sequence that links sister chromatids. This is also where kinetochores, protein complexes to which spindle microtubules attach, are constructed after the chromosome is replicated. The kinetochores allow the spindle microtubules to move the chromosomes within the cell during cell division.
Telomeres consist of non-coding repetitive nucleotide...

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関連する実験動画

Updated: Jul 10, 2026

Genome-wide Purification of Extrachromosomal Circular DNA from Eukaryotic Cells
14:26

Genome-wide Purification of Extrachromosomal Circular DNA from Eukaryotic Cells

Published on: April 4, 2016

人間のY染色体特異的な繰り返し配列の進化

H J Cooke, R D McKay

    Cell
    |March 1, 1978
    PubMed
    まとめ

    研究者らは,ヒトY染色体で繰り返されるDNA配列を研究した. この配列は衛星IIIのDNAと関連しているが,構造的な違いがある.

    科学分野:

    • 遺伝学 遺伝学とは
    • 分子生物学は分子生物学である.
    • 人間の染色体の研究

    背景:

    • 繰り返されるDNA配列は,ゲノム構造と進化において重要な役割を果たします.
    • 人間のY染色体は,進化の歴史が完全に理解されていないユニークな繰り返しの要素を含んでいます.
    • 衛星DNA配列は,構造的多様性と潜在的機能的重要性で知られています.

    研究 の 目的:

    • 人間のY染色体における特定の繰り返し配列の構造と進化的関係を明らかにする.
    • 女性を含む他のゲノム領域とのこの配列のホモロジーを調査する.
    • 特徴づけられた配列を,既知のヒト衛星DNAファミリーと比較するために.

    主な方法:

    • 全ヒトDNAと単離された重複配列の制限酵素分析.
    • 女性DNAのシーケンスホモロジーを検出するためのクロスハイブリデーション実験.
    • マウス/ヒトの細胞ハイブリッドを用いた分析で,X染色体とオートソームの配列分布をマッピングした.

    主要な成果:

    • Y染色体からの繰り返しの配列は,その構造的特徴のために分析されました.
    • 配列は,女性のDNAの配列と交叉混合を示し,不安定なDNA複合体を形成しました.

    さらに関連する動画

    Chromatin Immunoprecipitation (ChIP) of Histone Modifications from Saccharomyces cerevisiae
    11:06

    Chromatin Immunoprecipitation (ChIP) of Histone Modifications from Saccharomyces cerevisiae

    Published on: December 29, 2017

    Electrophoretic Analysis of Replication Through Structure-Prone DNA Repeats Within the SV40-Based Human Episome
    05:22

    Electrophoretic Analysis of Replication Through Structure-Prone DNA Repeats Within the SV40-Based Human Episome

    Published on: September 13, 2024

    関連する実験動画

    Last Updated: Jul 10, 2026

    Genome-wide Purification of Extrachromosomal Circular DNA from Eukaryotic Cells
    14:26

    Genome-wide Purification of Extrachromosomal Circular DNA from Eukaryotic Cells

    Published on: April 4, 2016

    Chromatin Immunoprecipitation (ChIP) of Histone Modifications from Saccharomyces cerevisiae
    11:06

    Chromatin Immunoprecipitation (ChIP) of Histone Modifications from Saccharomyces cerevisiae

    Published on: December 29, 2017

    Electrophoretic Analysis of Replication Through Structure-Prone DNA Repeats Within the SV40-Based Human Episome
    05:22

    Electrophoretic Analysis of Replication Through Structure-Prone DNA Repeats Within the SV40-Based Human Episome

    Published on: September 13, 2024

  • 比較分析により,この配列と人工衛星IIIDNAとの間に有意な構造的差異が明らかになった.

    • 結論:

    • 研究されたY染色体の繰り返しの配列は,進化的にヒトの衛星IIIと関連している.
    • この関係にもかかわらず,実質的な構造的差異が存在し,独立した進化または改変を示唆しています.
    • 女性DNAにおける配列の存在と行動は,複雑な進化的動態と潜在的な機能的影響を示している.