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相关概念视频

Base Excision Repair01:54

Base Excision Repair

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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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Erwin Chargaff’s rules on DNA equivalence paved the way for the discovery of base pairing in DNA. Chargaff’s rules state that in a double-stranded DNA molecule,
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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.
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基础编辑的进步:专注于基础转换.

Dawei Wang1, YiZhan Zhang2, Jinning Zhang1

  • 1Department of Endocrinology, Shandong Provincial Hospital Affiliated to Shandong First Medical University, China; Key Laboratory of Endocrine Glucose & Lipids Metabolism and Brain Aging, Ministry of Education, Shandong Provincial Hospital Affiliated to Shandong First Medical University, China; "Chuangxin China" Innovation Base of stem cell and Gene Therapy for endocrine Metabolic diseases, China; Shandong Engineering Research Center of Stem Cell and Gene Therapy for Endocrine and Metabolic Diseases, Jinan, Shandong 250021, China.

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概括

新的基准编辑器现在可以纠正所有导致遗传疾病的点突变. 这项技术使基于CRISPR的疗法超越了早期的细胞因子和腺因基编辑器,为以前无法治疗的疾病提供了希望.

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科学领域:

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

背景情况:

  • 单核酸变体 (SNV) 是人类遗传疾病的最常见原因.
  • 基于CRISPR的基编辑器 (BEs) 提供SNV的直接校正,细胞素基编辑器 (CBEs) 和腺素基编辑器 (ABEs) 处理过渡突变.
  • 然而,转变突变需要基因替换,早期的BEs无法纠正.

研究的目的:

  • 审查基础基础转换编辑器的基础知识和最近的进展.
  • 为了突出当前基础转换编辑器的局限性.
  • 讨论基础转换编辑器对人类疾病的治疗潜力.

主要方法:

  • 对基础编辑器现有文献的审查,重点是基础转换编辑器.
  • 分析各种基础转换编辑系统的机制和功能.
  • 讨论该领域的挑战和未来方向.

主要成果:

  • 细胞因子基编辑器 (CBE) 和腺因基编辑器 (ABE) 纠正过渡突变 (C-to-T,T-to-C,A-to-G,G-to-A).
  • 基础转换编辑器已被开发用于纠正纯胺基突变,补充现有的BEs.
  • 基础转换编辑器不如过渡编辑器发达,但能够纠正所有点突变类型.

结论:

  • 基基转换编辑器代表了一项重大进步,扩大了基于CRISPR的基因校正范围.
  • 需要进一步开发以克服局限性并提高基础转换编辑器的有效性.
  • 这些编辑对于治疗由SNVs引起的更广泛的遗传疾病具有相当大的希望.