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检测主要编辑引起的甲基化变化
Ronin Joshua S Cosiquien1, Isaiah J Whalen1, Phillip Wong1
1Department of Medicine, University of Minnesota Twin Cities, Minneapolis, MN 55455, USA.
Genes
|July 29, 2025
概括
主编辑是一种精确的基因编辑工具,可能会导致局部DNA甲基化变化,特别是在CpG岛屿和编码区域. 这些表观遗传变化可能会影响基因表达和细胞通路,需要进一步评估治疗用途的安全性.
科学领域:
- 分子生物学分子生物学
- 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
- 基因组学就是基因组学.
背景情况:
- 主编辑比CRISPR-Cas9基因编辑提供了更高的精度.
- 潜在的非目标效应,包括诸如DNA甲基化之类的表观遗传修饰,需要对主要编辑进行调查.
- 了解DNA甲基化变化对于安全的基因组编辑应用至关重要.
研究的目的:
- 调查主要编辑是否会在人类细胞中诱导异常的CpG甲基化模式.
- 将原始编辑 (PE2) 的表观遗传效应与CRISPR-Cas9.9进行比较.
- 为了确定特定的基因组区域容易受到主要编辑诱导的甲基化变化.
主要方法:
- 全基因组二硫酸盐测序 (WGBS) 用于分析DNA甲基化模式.
- 对照细胞,Cas9编辑细胞和PE2编辑细胞之间的甲基化概况的比较.
- 生物信息分析包括差异甲基化区域 (DMR) 识别和功能丰富 (基因本体学,KEGG途径).
主要成果:
- 在Cas9和PE2编辑细胞之间观察到整体甲基化相似性.
- 在PE2编辑的细胞中检测到局部,异常的CpG甲基化变化,特别是在CpG岛屿和外子区域.
- 与Cas9编辑相比,PE2编辑显示了编码序列中DMR的比例更高,并且增加了CpG岛甲基化.
结论:
- 主编辑可以在人体细胞中诱导局部DNA甲基化变化,影响调节和编码区域.
- CpG 群岛和编码序列容易受到主要编辑的表观遗传改变.
- 这些微妙的表观遗传变化可能会影响基因表达和细胞通路,需要仔细考虑治疗性基因组编辑开发.
相关概念视频
01:39Mutations
Overview
01:39Mutations
Overview
02:04Covalently Linked Protein Regulators
Proteins can undergo many types of post-translational modifications, often in response to changes in their environment. These modifications play an important role in the function and stability of these proteins. Covalently linked molecules include functional groups, such as methyl, acetyl, and phosphate groups, and also small proteins, such as ubiquitin. There are around 200 different types of covalent regulators that have been identified.
These groups modify specific amino acids in a protein.
These groups modify specific amino acids in a protein.
01:54Base Excision Repair
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...
The first step of...
02:23RNA Editing
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...
01:35Mutations
Mutations are changes in the sequence of DNA. These changes can occur spontaneously or they can be induced by exposure to environmental factors. Mutations can be characterized in a number of different ways: whether and how they alter the amino acid sequence of the protein, whether they occur over a small or large area of DNA, and whether they occur in somatic cells or germline cells.
Chromosomal Alterations Are Large-Scale Mutations
While point mutations are changes in a single nucleotide in...
Chromosomal Alterations Are Large-Scale Mutations
While point mutations are changes in a single nucleotide in...