マルチ侵入は,染色体再配置を誘発する再結合副産物である
Aurèle Piazza1, William Douglass Wright1, Wolf-Dietrich Heyer2
1Department of Microbiology and Molecular Genetics, One Shields Avenue, University of California, Davis, Davis, CA 95616, USA.
Cell
|August 8, 2017
まとめ
マルチ侵入誘発再配置 (MIR) と呼ばれる新しいDNA修復経路は染色体の転位を引き起こす可能性があります. 壊れたDNA末端が 完ぺきな染色体に侵入することで引き起こされる この過程は DNAのさらなる損傷につながり 病気にも影響を及ぼします
科学分野:
- 遺伝学
- 分子生物学
- ゲノミクス
背景:
- 染色体構造の変異は不正確なDNA修復から生じる.
- これらの変異は進化を促し 病気を引き起こします
研究 の 目的:
- DNAの再編成メカニズムについて説明します
- このメカニズムに影響を与える分子プレーヤーと条件を明らかにする.
主な方法:
- 遺伝的および生化学的アプローチを用いてDNA修復中間物質を調査した.
- この過程における特定の核酸と再結合因子の役割を分析した.
- 染色体の整合性への影響を調べた
主要な成果:
- 新しいメカニズムであるマルチインヴァージョン誘発リアレンジメント (MIR) を特定し,1つの破れたDNA端が2つの別々の無傷の染色体に侵入する.
- MIRはドナー染色体間の同質性とは無関係であるが,特定の構造選択性エンドヌクレアース (Mus81-Mms4,Slx1-Slx4,Yen1) を必要とすることが実証された.
- MIRは再結合中間物質 (Rad1-Rad10,Sgs1-Top3-Rmi1,Srs2,Mph1) を解消する因子によって抑制され,二次染色体破裂やさらなる再配置につながる可能性があることが示された.
結論:
- MIRはトランスロケーションと複雑なゲノム再編成を生成するための新しい経路です.
- このメカニズムは ゲノムの安定性を維持する DNA 修復酵素の複雑な相互作用を強調しています
- MIRは,染色体異常に関連した様々なヒト病変の病因を理解するために重要な意味を持っています.
関連する概念動画
Conservative Site-specific Recombination and Phase Variation
6.9K
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...
The recognition sites for Cre recombinase called LoxP...
6.9K
Viral Recombination
25.4K
Cells are sometimes infected by more than one virus at once. When two viruses disassemble to expose their genomes for replication in the same cell, similar regions of their genomes can pair together and exchange sequences in a process called recombination. Alternatively, viruses with segmented genomes can swap segments in a process called reassortment.
25.4K
Crossing Over
6.8K
Crossing over is the exchange of genetic information between homologous chromosomes during prophase I of meiosis I. Genetic recombination gives rise to allelic diversity in the newly formed daughter cells. In humans, crossing over produces genetically distinct haploid egg and sperm cells that undergo fertilization to produce unique offspring. Before cell division starts, the germ cell’s chromosome(s) undergo duplication in the S phase of the cell cycle. As the cells enter prophase I,...
6.8K
Crossing Over
172.6K
Unlike mitosis, meiosis aims for genetic diversity in its creation of haploid gametes. Dividing germ cells first begin this process in prophase I, where each chromosome—replicated in S phase—is now composed of two sister chromatids (identical copies) joined centrally.
The homologous pairs of sister chromosomes—one from the maternal and one from the paternal genome—then begin to align alongside each other lengthwise, matching corresponding DNA positions in a process...
The homologous pairs of sister chromosomes—one from the maternal and one from the paternal genome—then begin to align alongside each other lengthwise, matching corresponding DNA positions in a process...
172.6K
Exon Recombination
4.2K
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...
Exon shuffling follows “splice frame rules.” Each exon...
4.2K
Gene Conversion
10.7K
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...
10.7K


