相关实验视频
Updated: Sep 11, 2025

07:58
Characterizing Mutational Load and Clonal Composition of Human Blood
Published on: July 11, 2019
7.5K
在XP-C患者的血液细胞中独特的高自发突变负荷
Gordon Fan-Huang1, Elizabeth L Schmidt2,3, Moonsook Lee1
1Department of Genetics, Albert Einstein College of Medicine, Bronx NY 10461, USA.
bioRxiv : the preprint server for biology
|August 12, 2025
概括
Xeroderma Pigmentosum C组 (XP-C) 患者在血液细胞中表现出高的体质突变率,与DNA修复缺陷有关. 这种先前存在的突变负担有助于XP-C白血病的发展.
科学领域:
- 遗传学 遗传学 是一个
- 分子生物学分子生物学
- 癌症研究 癌症研究
背景情况:
- Xeroderma Pigmentosum (XP) 是一种罕见的遗传性疾病,其特征是缺少DNA修复.
- XP组C (XP-C) 特别涉及全球基因组核酸切除修复 (GG-NER) 的缺陷.
- 了解XP患者的突变格局对于理解疾病的发病和进展至关重要.
研究的目的:
- 为了研究XP-C患者的外周血液单核细胞 (PBMCs) 中的自发体内突变负载.
- 确定导致XP-C.超变的特定突变特征和机制.
- 为了确定观察到的突变是否在XP-C白血病中先发生恶性转变.
主要方法:
- 来自XP-C患者的PBMC和纤维细胞的全基因组测序.
- 单核酸变体 (SNV) 和突变特征的分析.
- 不同细胞类型之间的突变负荷与健康对照的比较.
主要成果:
- 在PBMC中,XP-C患者表现出显著高的自发体质突变负载.
- 较高的SNV与突变特征SBS8和SBS32以及细胞因子缺失有关.
- 在纤维细胞中,超变性不那么明显,这表明了一种依赖于复制的突变发生机制.
- 根据血液细胞的突变负载,在XP中确定了不同的分子亚型.
结论:
- 在XP-C中缺乏GG-NER导致血液细胞的高,复制依赖的突变负载.
- 这种先前存在的突变负担是XP-C白血病发展的关键因素.
- 这些发现强调了评估非恶性细胞的突变负荷对于理解XP亚型和癌症起源的重要性.
相关概念视频
Cancers Originate from Somatic Mutations in a Single Cell
12.7K
Cancer arises from mutations in the critical genes that allow healthy cells to escape cell cycle regulation and acquire the ability to proliferate indefinitely. Though originating from a single mutation event in one of the originator cells, cancer progresses when the mutant cell lines continue to gain more and more mutations, and finally, become malignant. For example, chronic myelogenous leukemia (CML) develops initially as a non-lethal increase in white blood cells, which progressively...
12.7K
Spontaneous and Induced Mutations
145
Spontaneous mutations arise infrequently during DNA replication due to errors in the process. A key factor behind these errors is tautomeric shifts in nitrogenous bases, where bases transition from keto to enol forms or amino to imino forms. This shift can alter base-pairing rules, leading to mutations. Additionally, reactive oxygen species (ROS) arising from aerobic metabolism can damage DNA, resulting in depurination (loss of a purine base) or depyrimidination (loss of a pyrimidine base).
145
Mismatch Repair
5.2K
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...
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...
5.2K
Nucleotide Excision Repair
3.8K
DNA Distortion and Damage
Cells are regularly exposed to mutagens—factors in the environment that can damage DNA and generate mutations. UV radiation is one of the most common mutagens and is estimated to introduce a significant number of changes in DNA. These include bends or kinks in the structure, which can block DNA replication or transcription. If these errors are not fixed, the damage can cause mutations, which in turn can result in cancer or disease depending on which sequences are...
Cells are regularly exposed to mutagens—factors in the environment that can damage DNA and generate mutations. UV radiation is one of the most common mutagens and is estimated to introduce a significant number of changes in DNA. These include bends or kinks in the structure, which can block DNA replication or transcription. If these errors are not fixed, the damage can cause mutations, which in turn can result in cancer or disease depending on which sequences are...
3.8K
Mutations
84.2K
Overview
84.2K
Other Unique Bacteria
83
Magnetic bacteria exhibit a directed movement called magnetotaxis, driven by structures called magnetosomes. These magnetosomes consist of chains of magnetic particles made of either magnetite (Fe₃O₄) or greigite (Fe₃S₄) and are organized in a linear conformation by a protein scaffold within invaginations of the cell membrane. The bacteria align along the north–south magnetic field lines, much like a compass needle. They are typically microaerophilic or anaerobic...
83

