相关实验视频

Updated: Feb 13, 2026

Direct Restart of a Replication Fork Stalled by a Head-On RNA Polymerase

Direct Restart of a Replication Fork Stalled by a Head-On RNA Polymerase

Published on: April 29, 2010

一种定量DNA纤维试验,用于监测复制分叉的进展,保护和重启

Debanjali Bhattacharya¹, Ganesh Nagaraju¹

¹Department of Biochemistry, Indian Institute of Science, Bangalore, India.

|February 12, 2026

概括

这项研究引入了一种DNA纤维测定方法,用于以单分子分辨率可视化DNA复制动态. 这种方法提供了在各种细胞应力下对复制参数的定量见解,克服了以前技术的局限性.

科学领域:

分子生物学分子生物学
遗传学遗传学是一个
细胞生物学细胞生物学

背景情况:

DNA复制对于细胞分裂至关重要,但面临着各种压力.
之前研究复制动态的方法具有有限的空间分辨率,并提供平均估计值.
了解在生理和压力条件下的复制对于基因组稳定至关重要.

研究的目的:

描述一种用于高分辨率可视化DNA复制动态的新型DNA纤维测定方法.
为了能够在单个分子水平上对复制参数进行定量分析.
为研究正常和应激条件下的复制提供一种可复制的方法.

主要方法:

在复制DNA中纳入蒂米丁类似物 (CldU和IdU).
在玻璃幻灯片上拉伸和固定标记的DNA,然后进行变性.
使用抗体对抗CldU/IdU和光显微镜的标记新生DNA的可视化.

主要成果:

在DNA纤维测试允许可视化个体复制DNA分子与单分子分辨率.
该技术具有定量性,高吞吐量,并且可以在不同的细胞系中复制.
它提供了对DNA合成速率,分叉保护,重启和在复制压力下不对称性的洞察.

结论:

基因纤维测定是一种强大而通用的工具,用于研究DNA复制动力学.
它在较旧的方法上提供了显著的优势,为复制机制提供了详细的见解.
这种技术对于研究基因毒剂和细胞应激对基因组复制的影响是有价值的.

关键词:

检测DNA纤维的测定方法叉形不对称性是因为叉形不对称.叉子保护叉子保护叉子重启重新启动叉速是指分叉速度的速度.复制复制复制复制复制复制复制复制应激是复制应激的一种.

更多相关视频

Visualization of DNA Replication in the Vertebrate Model System DT40 using the DNA Fiber Technique

Visualization of DNA Replication in the Vertebrate Model System DT40 using the DNA Fiber Technique

Published on: October 27, 2011

Detection of Post-Replicative Gaps Accumulation and Repair in Human Cells Using the DNA Fiber Assay

Detection of Post-Replicative Gaps Accumulation and Repair in Human Cells Using the DNA Fiber Assay

Published on: February 3, 2022

相关概念视频

Restarting Stalled Replication Forks

Restarting Stalled Replication Forks

DNA replication is initiated at sites containing predefined DNA sequences known as origins of replication. DNA is unwound at these sites by the minichromosome maintenance (MCM) helicase and other factors such as Cdc45 and the associated GINS complex.The unwound single strands are protected by replication protein A (RPA) until DNA polymerase starts synthesizing DNA at the 5’ end of the strand in the same direction as the replication fork. To prevent the replication fork from falling apart,...

Restarting Stalled Replication Forks

Restarting Stalled Replication Forks

The DNA Replication Fork

The DNA Replication Fork

An organism’s genome needs to be duplicated in an efficient and error-free manner for its growth and survival. The replication fork is a Y-shaped active region where two strands of DNA are separated and replicated continuously. The coupling of DNA unzipping and complementary strand synthesis is a characteristic feature of a replication fork. Organisms with small circular DNA, such as E. coli, often have a single origin of replication; therefore, they have only two replication...

The DNA Replication Fork

The DNA Replication Fork

DNA Replication

DNA Replication

DNA replication involves the separation of the two strands of the double helix, with each strand serving as a template from which the new complementary strand is copied. After replication, each double-stranded DNA includes one parental or “old” strand and one “new” strand. This is known as semiconservative replication. The resulting DNA molecules have the same sequence and are divided equally into the two daughter cells.
Replication in Prokaryotes
DNA replication...

Chromosome Replication

Chromosome Replication

Before a cell can divide, it must accurately replicate all of its chromosomes, including the DNA and its associated histone and non-histone proteins. This process begins at numerous origins of replication during the S phase of the cell cycle in each of a cell’s chromosomes simultaneously. Certain nucleotides can act as origins of replication, but these sequences are not well defined - especially in complex, multi-cellular, eukaryotic species. The length of DNA that spans an origin...