重组结合的DNA合成促进了介质交叉和非交叉形成的入侵后步骤
Hyungseok Choi1, Jun Seo Lee1, Jeong H Joo1
1Department of Life Sciences, Chung-Ang University, Seoul 06974, South Korea.
Nucleic acids research
|July 27, 2025
概括
DNA聚合酶三角酶 (Pol δ) 通过在双链断裂时延长DNA合成来驱动介质复合合DNA合成 (MRDS). 这一过程对于精确的DNA修复和变过程中交叉和非交叉产物的形成至关重要.
科学领域:
- 分子生物学分子生物学
- 遗传学 是一个遗传学.
- 细胞生物学 细胞生物学
背景情况:
- 介质双链断裂 (DSB) 修复涉及5'末端切除,以创建3'单链DNA (ssDNA) 尾巴.
- 这些ssDNA尾巴对于同质性搜索和遗传重组期间的链交换至关重要.
- 在重组过程中,DSB位点的DNA合成和特定DNA聚合酶在重组过程中的作用仍然不清楚.
研究的目的:
- 为了研究Saccharomyces cerevisiae中中性重组结合DNA合成 (MRDS).
- 阐明DNA聚合酶在DSB修复和重组途径中的参与.
- 了解基因交叉和非交叉形成的基因水平机制.
主要方法:
- 重组事件的物理分析.
- 提米丁类型的定时结合.
- 在Saccharomyces cerevisiae中进行超分辨率显微镜成像.
主要成果:
- DNA聚合酶delta (Pol δ) 对于通过终端原料合成扩展D环结构至关重要.
- 聚 δ介导的MRDS支持对双休日结和非交叉构造的入侵后步骤.
- 对于位移循环/单端入侵扩展,需要MRDS,以确保准确的基点配对.
结论:
- DNA聚合酶三角酶在介质重组-合DNA合成中发挥着关键作用.
- MRDS 是一个关键的过程,在介质重组的入侵后阶段进行调节.
- 这项研究阐明了Pol δ在确保精确的DNA修复和重组结果中的作用.
更多相关视频
11:40Preparation of the Mgm101 Recombination Protein by MBP-based Tagging Strategy
Published on: June 25, 2013
12.2K
09:40Quantitation and Analysis of the Formation of HO-Endonuclease Stimulated Chromosomal Translocations by Single-Strand Annealing in Saccharomyces cerevisiae
Published on: September 23, 2011
14.8K
相关概念视频
01:30Crossing Over
4.8K
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,...
4.8K
02:08Gene Conversion
10.0K
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...
10.0K
02:31Homologous Recombination
4.9K
4.9K
02:53Conservative Site-specific Recombination and Phase Variation
6.1K
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...
6.1K
02:04Fixing Double-strand Breaks
12.9K
The double-stranded structure of DNA has two major advantages. First, it serves as a safe repository of genetic information where one strand serves as the back-up in case the other strand is damaged. Second, the double-helical structure can be wrapped around proteins called histones to form nucleosomes, which can then be tightly wound to form chromosomes. This way, DNA chains up to 2 inches long can be contained within microscopic structures in a cell. A double-stranded break not only damages...
12.9K
01:49Meiosis I
194.6K
Meiosis is a carefully orchestrated set of cell divisions, the goal of which—in humans—is to produce haploid sperm or eggs, each containing half the number of chromosomes present in somatic cells elsewhere in the body. Meiosis I is the first such division, and involves several key steps, among them: condensation of replicated chromosomes in diploid cells; the pairing of homologous chromosomes and their exchange of information; and finally, the separation of homologous chromosomes by...
194.6K