相关实验视频
Updated: Feb 7, 2026

08:23
CIRCLE-Seq for Interrogation of Off-Target Gene Editing
Published on: November 1, 2024
1.6K
针对周心卫星DNA的有针对性的编辑改变了对介质驱动的敏感性
bioRxiv : the preprint server for biology
|February 6, 2026
概括
研究人员开发了一种CRISPR/Cas9方法来改变卫星DNA (satDNA) 阵列,特别是果中的响应器 (Rsp) 位点. 这种技术精确地修改了satDNA复制号,揭示了它对基因功能和基因组组织的影响.
科学领域:
- 基因组学就是基因组学.
- 分子生物学分子生物学
- 进化生物学 进化生物学
背景情况:
- 细胞基因组含有丰富的卫星DNA (satDNA),这是在异色区域中发现的并列重复序列.
- 卫星DNA表现出动态的基因组位置和跨物种的复制数,尽管它们具有重复性,但有些影响表型.
- 由于分析高度重复的序列的困难,理解satDNA功能是具有挑战性的.
研究的目的:
- 开发和演示基于CRISPR/Cas9的策略,用于精确地对卫星DNA阵列进行基因操纵.
- 为了研究卫星DNA拷贝数的功能意义,使用Drosophila melanogaster*中的响应器 (Rsp) 位点.
- 建立一个新的框架来剖析卫星DNA功能及其在基因组组织中的作用.
主要方法:
- 使用基于CRISPR/Cas9的顺序策略,在卫星DNA阵列中引入突变.
- 这种方法使用Drosophila melanogaster*的*Responder (Rsp) *自体细胞中心卫星DNA进行了验证.
- 产生了 *Rsp* 的删除和扩张变体,并分析了它们对精子生成及其对 *隔离扰乱器 (SD) * 系统的敏感性的影响.
主要成果:
- 该CRISPR/Cas9方法有效地产生精确的卫星DNA变体,最小的目标外影响.
- 在 *Rsp* 拷贝数的突变直接影响了对 *隔离扰乱器 (SD) * 系统的敏感性.
- 观察到的对*SD*敏感性的影响与*Rsp*副本数量成比例.
结论:
- 这项研究提出了一种有效的基于CRISPR/Cas9的方法,用于实验性剖析卫星DNA功能.
- 卫星DNA拷贝数是其功能影响的关键决定因素,如 *Rsp* locus 所示.
- 这些发现为卫星DNA在基因组组织和进化中的进化和功能作用提供了新的见解.
相关概念视频
RNA Editing
9.9K
RNA editing is a post-transcriptional modification where a precursor mRNA (pre-mRNA) nucleotide sequence is changed by base insertion, deletion, or modification. The extent of RNA editing varies from a few hundred bases, in mitochondrial DNA of trypanosomes, to a just single base, in nuclear genes of mammals. Even a single base change in the pre-mRNA can convert a codon for one amino acid into the codon for another amino acid or a stop codon. This type of re-coding can significantly affect the...
9.9K
DNA-only Transposons
17.5K
DNA-only transposons are called autonomous transposons since they code for the enzyme transposase that is required for the transposition mechanism. Insertion of transposons can alter gene functions in multiple ways. They can mutate the gene, alter gene expression by introducing a novel promoter or insulator sequence, introduce new splice sites, and change the mRNA transcripts produced, or remodel chromatin structure.
The donor site from where the transposon is excised is either degraded or...
The donor site from where the transposon is excised is either degraded or...
17.5K
Alterations in Respiration II
1.8K
There are numerous types of normal and abnormal respiration. Based on ventilatory movements, breathing patterns are classified as regular, deep, or shallow. Examples include Biot's breathing, Cheyne-Stokes respiration, Kussmaul's breathing, hyperventilation, and hypoventilation. Each pattern is clinically significant and aids in evaluating patients.
In Biot's breathing, the respiratory rate and depth are irregular, alternating between periods of deep gasping and apnea. Common causes...
In Biot's breathing, the respiratory rate and depth are irregular, alternating between periods of deep gasping and apnea. Common causes...
1.8K
Energy to Drive Translocation
2.9K
Mitochondrial protein import is powered by two distinct energy sources: ATP hydrolysis and electrochemical potential across the inner membrane. Newly synthesized precursors are bound by cytosolic chaperones of the Hsp70 family, which guide them to the import receptors on the mitochondrial surface. Utilizing the energy of ATP hydrolysis, Hsp70 chaperones transfer these precursors to the TOM receptors on the mitochondrial outer membrane.
Generally, polypeptides are unfolded by two distinct...
Generally, polypeptides are unfolded by two distinct...
2.9K
Altered States of Awareness
1.2K
Altered states of consciousness represent significant deviations from one's normal mental state. These deviations can range from subtle changes in awareness to profound transformations in perception, thought processes, and sensory experiences. Altered states of consciousness can be triggered by various factors, including drug use, meditation, hypnosis, illness, or even intense fatigue.
The ingestion of substances like stimulants or hallucinogens leads to chemical alterations in the brain...
The ingestion of substances like stimulants or hallucinogens leads to chemical alterations in the brain...
1.2K
Energy of a Satellite in a Circular Orbit
3.0K
Thousands of artificial satellites orbit the Earth every day at various distances from the Earth. Satellites that orbit the Earth below an altitude of 1,600 km are considered to be orbiting in low-Earth orbit (LEO). Research satellites and Earth observation satellites are usually placed in LEO, and mostly orbit the Earth in elliptical orbits. Navigation satellites are placed in medium-Earth orbit (MEO), ranging from 2,000 km to 36,000 km from the surface of the Earth. Meanwhile, communication...
3.0K

