相关实验视频
Updated: May 15, 2026

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Detection of Copy Number Alterations Using Single Cell Sequencing
Published on: February 17, 2017
全基因组检测单核酸和复制数变异的单个人类细胞
Chenghang Zong1, Sijia Lu, Alec R Chapman
1Department of Chemistry and Chemical Biology, Harvard University, Cambridge, MA 02138, USA.
概括
一种名为多重和循环式放大周期 (MALBAC) 的新方法可以改善单细胞的全基因组测序. 这种技术克服了放大偏差,使得高基因组覆盖率和精确检测遗传变异,如副本数变异和单核酸变异.
科学领域:
- 基因组学就是基因组学.
- 分子生物学分子生物学
- 生物技术是生物技术.
背景情况:
- 由于动态的DNA变化,在亲属细胞中产生基因组差异.
- 单细胞测序对于表征这些基因组变异至关重要.
- 当前方法中的全基因组放大偏差限制了基因组覆盖和准确性.
研究的目的:
- 引入一种新的放大方法,即多重和循环式放大周期 (MALBAC).
- 评估MALBAC在实现高基因组覆盖率和单细胞测序一致性方面的有效性.
- 展示MALBAC在检测基因组变异的能力,如复制数变异 (CNV) 和单核酸变异 (SNV).
主要方法:
- 开发和应用MALBAC技术用于DNA放大.
- 全基因组测序MALBAC放大单个人类细胞.
- 对测序数据的分析,以评估基因组覆盖范围和识别遗传变异.
- 在癌症细胞系中直接测量全基因组突变率.
主要成果:
- 在25倍的平均测序深度下,MALBAC实现了单个人类细胞93%的基因组覆盖率 (≥1x).
- 在单个癌细胞中检测到数字化副本数变异 (CNV).
- 在三个亲属细胞中确定了单个单核酸变异 (SNV),没有假阳性.
- 直接测量了癌细胞系的全基因组突变率,揭示了频繁的 purin-pyrimidine 交换.
结论:
- MALBAC显著提高了单细胞测序中的基因组覆盖率和统一性.
- 该方法能够准确检测大规模 (CNV) 和小规模 (SNV) 基因组变异.
- 马尔巴克为研究细胞异质性和测量单细胞水平的突变率提供了一个强大的工具.
相关概念视频
Comparing Copy Number Variations and SNPs
Sequencing of the human genome has opened up several best-kept secrets of the genome. Scientists have identified thousands of genome variations that exist within a population. These variations can be a single nucleotide or a larger chromosomal variation.
Copy number variations or CNVs are the structural variations that cover more than 1kb of DNA sequence. The single nucleotide polymorphism (SNP), on the other hand, is a single nucleotide change or a point mutation that is found in more than 1%...
Copy number variations or CNVs are the structural variations that cover more than 1kb of DNA sequence. The single nucleotide polymorphism (SNP), on the other hand, is a single nucleotide change or a point mutation that is found in more than 1%...
Single Nucleotide Polymorphisms-SNPs
A single nucleotide polymorphism or SNP is a single nucleotide variation at a specific genomic position in a large population. It is the most prevalent type of sequence variation found in the human genome. Point mutations that occur in more than 1% of the population qualify as SNPs. These are present once every 1000 nucleotides on an average in the human genome. Replacement of a purine with another purine (A/G) or a pyrimidine with another pyrimidine (C/T) is known as a transition. In contrast,...
Genome Copying Errors
DNA replication is a well-evolved process that copies millions of base pairs with high fidelity during each cell division. Occasionally a wrong base or a long stretch of wrong bases may get added to the daughter strands. If the errors are left unchecked, cells might accumulate several mutations that might endanger their survival. Therefore, the copying errors are checked and repaired at three levels.
DNA Microarrays
Microarrays are high-throughput and relatively inexpensive assays that can be automated to analyze large quantities of data at a time. They are used in genome-wide studies to compare gene or protein expression under two varied conditions, such as healthy and diseased states. Microarrays consist of glass or silica slides on which probe molecules are covalently attached through surface functionalization. Most commonly, the slides are prepared through the chemisorption of silanes to silica...
Karyotyping
Overview

