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相关概念视频

Long-patch Base Excision Repair01:02

Long-patch Base Excision Repair

6.9K
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:
6.9K
Base Excision Repair01:54

Base Excision Repair

21.6K
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...
21.6K
Maxam-Gilbert Sequencing01:05

Maxam-Gilbert Sequencing

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In the same year as the discovery of the Sanger sequencing method, another group of scientists, Allan Maxam and Walter Gilbert, demonstrated their chemical-cleavage method for DNA sequencing. The Maxam-Gilbert method relies on using different chemicals that can cleave the DNA sequence at specific sites, the separation of resulting DNA fragments of variable size using electrophoresis, and deciphering the DNA sequence from the resulting gel bands.
Challenges of the Maxam-Gilbert Method
The...
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Mismatch Repair01:20

Mismatch Repair

4.6K
Organisms are capable of detecting and fixing nucleotide mismatches that occur during DNA replication. This sophisticated process requires identifying the new strand and replacing the erroneous bases with correct nucleotides. Mismatch repair is coordinated by many proteins in both prokaryotes and eukaryotes.
The Mutator Protein Family Plays a Key Role in DNA Mismatch Repair
The human genome has more than 3 billion base pairs of DNA per cell. Prior to cell division, that vast amount of genetic...
4.6K
Base-pairing and DNA Repair02:27

Base-pairing and DNA Repair

64.4K
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Proofreading01:31

Proofreading

6.0K
Synthesis of new DNA molecules is carried out by the enzyme DNA polymerase, which adds nucleotides on the daughter strand complementary to the template DNA strand. DNA polymerase has a higher affinity to add the correct base and ensures fidelity during DNA replication. Furthermore,  it exhibits proofreading activity during replication, using an exonuclease domain that cuts off incorrect nucleotides from the nascent DNA strand.
Errors During Replication are Corrected by the DNA Polymerase...
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相关实验视频

Updated: May 10, 2025

Efficient PAM-Less Base Editing for Zebrafish Modeling of Human Genetic Disease with zSpRY-ABE8e
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QBEmax是一个序列变换和内部受保护的基础编辑器.

Jiacheng Hu1, Mengyue Guo1, Qiang Gao1

  • 1Qi Biodesign, Beijing, China.

Nature biotechnology
|April 21, 2025
PubMed
概括
此摘要是机器生成的。

QBEmax是一种新型的细胞因子基编辑器 (CBE),可以实现高纯度的C-to-T编辑,最小的意外突变. 这个稳定的编辑器显示了精确基因编辑应用的前景.

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科学领域:

  • 分子生物学分子生物学
  • 遗传学 遗传学 是一个
  • 生物技术是生物技术.

背景情况:

  • 细胞基编辑器 (CBEs) 是基因编辑的宝贵工具.
  • 多重基因淘汰应用受到不纯的编辑,indel和非目标突变的阻碍.

研究的目的:

  • 为基因编辑开发一个高效和精确的基因编辑器.
  • 在多重基因淘汰中克服现有CBE的局限性.

主要方法:

  • 开发和描述一个新的基础编辑器,QBEmax.
  • 分子动态建模以评估编辑器的稳定性和机制.
  • 评价编辑效率,产品纯度,印章形成和非目标效应.

主要成果:

  • QBEmax表现出高编辑效率,高达99.8%的C-T转换率.
  • 编辑器表现出显著减少的内形成和非目标突变.
  • 分子建模揭示了QBEmax的紧而稳定的结构,保护了目标基地.

结论:

  • QBEmax代表了基础编辑技术的重大进步.
  • 它的高纯度和低非目标活性使其适合精确的基因编辑.
  • QBEmax具有改善多重基因淘汰策略的潜力.