细胞类型特定的模式和体突变在发育和老化大脑的后果
bioRxiv : the preprint server for biology
|June 12, 2025
概括
双重多体细胞精确地识别单个细胞中的体质突变,揭示细胞类型特定的衰老模式和脑组织中的基因表达变化. 这种方法促进了对体质马赛克及其对健康和疾病的影响的理解.
科学领域:
- 基因组学和分子生物学
- 神经科学是一个神经科学.
- 癌症研究 癌症研究
背景情况:
- 准确地描述跨细胞类型的体质马赛克主义对于理解癌症,衰老和健康组织功能至关重要.
- 现有的低通量技术限制了对细胞类型特定的体质突变及其功能影响的研究.
- 开发高通量方法对于检测体质突变及其表型后果至关重要.
研究的目的:
- 开发一种高通量方法,即双重多组,用于从单个核中同时识别体质单核酸变体 (sSNV) 和多原子概况 (snATAC-seq,snRNA-seq).
- 准确量化罕见细胞群中的sSNVs并描述它们的突变光谱.
- 研究死后脑组织中细胞类型特定的体质突变率和模式及其与基因表达和疾病状态的相关性.
主要方法:
- 双重共识测序与单核多原子测试 (snATAC-seq,snRNA-seq) 集成,以提高准确性和减少测序错误.
- 在snATAC-seq库构建中引入了字符串标记,以消除人工突变签名.
- 双重多元组方法使用混合细胞系进行了验证,并应用于51,400多个从死后人类大脑组织中获取的细胞核.
主要成果:
- 双重多元体在低频细胞群中识别sSNV的高精度 (>92%) (2%) 并准确捕获已知的突变光谱.
- 该方法揭示了大脑中不同的神经元和质细胞类型的与年龄相关的突变率和模式.
- 克隆性sSNV在老年大脑的细胞质中被发现,并且与神经类型和自闭症谱系障碍 (ASD) 个体的基因表达改变相关.
结论:
- 双重多元体显著提高了在多种细胞类型和奥米克层中体性突变检测的准确性和吞吐量.
- 这些发现表明,不同的脑细胞类型表现出独特的与年龄相关的体质突变特征,为大脑衰老提供了新的见解.
- 身体突变直接影响基因表达表现型,涉及到正常衰老和神经发育障碍,如ASD.
更多相关视频
09:51Assessing Cell Cycle Progression of Neural Stem and Progenitor Cells in the Mouse Developing Brain after Genotoxic Stress
Published on: May 7, 2014
15.3K
09:25Lineage Tracing and Clonal Analysis in Developing Cerebral Cortex Using Mosaic Analysis with Double Markers MADM
Published on: May 8, 2020
10.6K
相关概念视频
Cancers Originate from Somatic Mutations in a Single Cell
11.8K
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...
11.8K
Replicative Cell Senescence
3.6K
Replicative cell senescence is a property of cells that allows them to divide a finite number of times throughout the organism's lifespan while preventing excessive proliferation. Replicative senescence is associated with the gradual loss of the telomere — short, repetitive DNA sequences found at the end of the chromosomes. Telomeres are bound by a group of proteins to form a protective cap on the ends of chromosomes. Embryonic stem cells express telomerase — an enzyme that adds...
3.6K
Mutations
81.0K
Overview
81.0K
Aging
39
Aging is a complex biological phenomenon influenced by various processes that affect cellular and systemic functions. Several prominent theories attempt to explain its mechanisms, highlighting cellular limitations, oxidative damage, and hormonal changes as central factors in aging.
Cellular Clock Theory
The cellular clock theory posits that the human lifespan is closely tied to the finite capacity of cells to divide, a phenomenon governed by telomeres, which are protective caps at the ends of...
Cellular Clock Theory
The cellular clock theory posits that the human lifespan is closely tied to the finite capacity of cells to divide, a phenomenon governed by telomeres, which are protective caps at the ends of...
39
