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相关概念视频

Bystander Effect02:09

Bystander Effect

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The discussion of bullying highlights the problem of witnesses not intervening to help a victim. This is a common occurrence, as the following well-publicized event demonstrates. In 1964, in Queens, New York, a 19-year-old woman named Kitty Genovese was attacked by a person with a knife near the back entrance to her apartment building and again in the hallway inside her apartment building. When the attack occurred, she screamed for help numerous times and eventually died from her stab wounds.
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Base Excision Repair01:54

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One of the common DNA damages is the chemical alteration of single bases by alkylation, oxidation, or deamination. The altered bases cause mispairing and strand breakage during replication. This type of damage causes minimal change to the DNA double helix structure and can be repaired by the base excision repair (BER) pathways. BER corrects damaged DNA sequences by removing the damaged base and restoring the original base sequence using the complementary strand as a template.
The first step of...
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Since the discovery of the two BER pathways, there has been a debate about how a cell chooses one pathway over the other and the factors determining this selection. Numerous in vitro experiments have pointed out multiple determinants for the sub-pathway selection. These are:
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RNA Editing02:23

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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...
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Buffer solutions do not have an unlimited capacity to keep the pH relatively constant . Instead, the ability of a buffer solution to resist changes in pH relies on the presence of appreciable amounts of its conjugate weak acid-base pair. When enough strong acid or base is added to substantially lower the concentration of either member of the buffer pair, the buffering action within the solution is compromised.
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Constructing a roadway embankment over uneven terrain requires precise leveling to ensure stability and proper drainage. Surveyors use a leveling instrument and staff to calculate ground elevations and determine the required fill material at each point along the embankment alignment.The process begins by positioning a leveling instrument near a benchmark with a known elevation. A backsight reading establishes the instrument height, which serves as a reference for subsequent measurements. A...
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相关实验视频

Updated: Sep 9, 2025

Efficient PAM-Less Base Editing for Zebrafish Modeling of Human Genetic Disease with zSpRY-ABE8e
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一个精简的基层编辑工程策略,以减少旁观者编辑

Izabella Valdez1,2,3, Ian O'Connor1,3, Divesh Patel4

  • 1Department of Immunology and Immunotherapy, Icahn School of Medicine at Mount Sinai, New York, NY, USA.

Nature communications
|August 30, 2025
PubMed
概括
此摘要是机器生成的。

研究人员设计了一种具有更窄编辑窗口的新型基准编辑器 (BE),以提高遗传疾病治疗的精度. 这种改进的基编辑技术减少了非目标突变, 使其成为更安全,更有效的治疗工具.

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Efficient PAM-Less Base Editing for Zebrafish Modeling of Human Genetic Disease with zSpRY-ABE8e
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科学领域:

  • 遗传学
  • 分子生物学
  • 生物技术

背景情况:

  • 基因编辑 (BE) 通过纠正没有DNA修复模板的致病变体,为遗传疾病提供了一个有前途的治疗策略.
  • 目前的基准编辑器具有广泛的活动窗口,限制了它们的治疗精度,并增加了非目标效应.

研究的目的:

  • 设计具有增强特异性的基础编辑器和改进的编辑窗口,以改善治疗应用.
  • 通过修改除氨酶活性中心来开发更精确,更安全的基编辑工具.

主要方法:

  • 将一个寡核酸结合模块集成到TadA-8e除氨酶活性中心中,以创建TadA-NW1变体.
  • 结合TadA-NW1与Cas9尼克酶和其他PAMCas9变体.
  • 与现有的基础编辑器 (ABE8e) 相比,评估了编辑效率,窗口大小和非目标活动.
  • 在针对CFTR W1282X变体的囊性纤维化细胞模型中测试了工程编辑器 (ABE-NW1).

主要成果:

  • 工程TadA-NW1变种在狭窄的四个核酸窗口内实现了强大的A-to-G编辑,比ABE的10bp窗口小得多.
  • 与ABE8e相比,ABE-NW1显著减少了Cas9依赖和独立的目标外活动,同时保持了可比的目标效率.
  • 在有限的窗口内成功重新编程TadA- NW1进行细胞胺去除和腺转化.
  • 在囊性纤维化细胞模型中,ABE-NW1有效且准确地纠正了CFTR W1282X变异,超过了现有的ABE.

结论:

  • 具有精细活动窗口的工程基因编辑器可以更精确地编辑基因组.
  • 在治疗基础编辑中,TadA-NW1变种及其衍生品提供了增强的特异性和减少的非目标效应.
  • 这项研究提出了改造基因组编辑器的简化策略,加速了精确的治疗基因编辑工具的开发.