相关实验视频

Updated: May 21, 2025

An Efficient Method for Quantitative, Single-cell Analysis of Chromatin Modification and Nuclear Architecture in Whole-mount Ovules in Arabidopsis

An Efficient Method for Quantitative, Single-cell Analysis of Chromatin Modification and Nuclear Architecture in Whole-mount Ovules in Arabidopsis

Published on: June 19, 2014

在Arabidopsis thaliana中,MutLγ强制执行介质交叉

Stéphanie Durand¹, Qichao Lian¹, Victor Solier¹

¹Department of Chromosome Biology, Max Planck Institute for Plant Breeding Research, Carl-von-Linné-Weg 10, 50829 Cologne, Germany.

Nucleic acids research

|March 19, 2025

概括

虽然MutLγ复合体在化过程中对启动交叉并非必不可少,但对于它们的适当成熟至关重要. 在Arabidopsis中,MUS81在没有MutLγ的情况下分解重组中间体,导致碎片化,除非MSH5也发生了突变.

科学领域:

遗传学遗传学是一种遗传学.
分子生物学分子生物学
细胞生物学细胞生物学

背景情况:

半变症涉及染色体交叉 (COs) 进行适当的分离和遗传多样性.
碳化合物干扰,即碳化合物间隔的趋势,是关键的监管机制.
在真核生物中,ZMM蛋白和MLH1-MLH3复合体 (MutLγ) 在CO形成中被保存.

研究的目的:

为了研究MutLγ复合体在Arabidopsis thaliana中化过程中CO形成中的特定作用.
阐明 MutLγ,ZMM 蛋白和像 MUS81 这样的核酶在调节 COs 的相互作用.

主要方法:

对阿拉比多普西斯突变物中介质重组的分析,包括mlh1,mlh3和与mus81和msh5的组合.
交叉点标记物 (HEI10焦点) 的表征及其成熟为COs.
在突变系中评估染色体完整性和CO干扰模式.

主要成果:

AtMutLγ对于启动ZMM-依赖的CO形成是部分不可或缺的,因为HEI10焦点在mlh1和mlh3突变中形成.
在MLH1或MLH3中发生的突变导致COs的不高效成熟.
在没有MutLγ的情况下,MUS81核酶分解重组中间体,导致染色体分裂,由msh5突变抑制.
在mlh1突变中,CO干扰只受到边缘的影响.

结论:

AtMutLγ对于确保特定的重组中间体仅作为交叉解决是必不可少的.
MutLγ可能通过不对称地解决双霍莱德连接来产生COs.
这项研究突出了MutLγ指导CO形成的保存途径,当MutLγ缺席时,由MUS81等核酶进行备份分辨.

更多相关视频

Efficient and Rapid Isolation of Early-stage Embryos from Arabidopsis thaliana Seeds

Efficient and Rapid Isolation of Early-stage Embryos from Arabidopsis thaliana Seeds

Published on: June 7, 2013

Chromatin Immunoprecipitation Assay for the Identification of Arabidopsis Protein-DNA Interactions In Vivo

Chromatin Immunoprecipitation Assay for the Identification of Arabidopsis Protein-DNA Interactions In Vivo

Published on: January 14, 2016

相关概念视频

Crossing Over

Crossing Over

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,...

Gene Conversion

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...

Transgenic Plants

Transgenic Plants

Recombinant DNA technology called transgenesis is often used to add a foreign gene or remove a detrimental gene from an organism. Such genetically modified organisms are called transgenic organisms.
The first-ever transgenic plant was a tobacco plant developed in 1983 that showed resistance against the tobacco mosaic virus. Since then, many transgenic plants have been developed and commercialized for improving the agricultural, ornamental, and horticultural value of a crop plant. Transgenic...

Monohybrid Crosses

Monohybrid Crosses

Dihybrid Crosses

Dihybrid Crosses

Meiosis I

Meiosis I

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...