化自结合DNA:在单核酸分辨率下对核酸进行多色识别
Shinsuke Sando1, Hiroshi Abe, Eric T Kool
1Department of Chemistry, Stanford University, Stanford, California 94305-5080, USA.
Journal of the American Chemical Society
|January 30, 2004
概括
新型多色灭自结合 (QUAL) 探针检测和区分RNA和DNA序列. 这些探针在结合时发光,使单核酸在没有酶或洗的情况下在细菌中分解.
科学领域:
- 分子生物学分子生物学
- 生物化学 生物化学
- 微生物学 微生物学
背景情况:
- 准确识别核酸序列在分子生物学中至关重要.
- 现有的序列检测方法可能很复杂,需要多个步骤和试剂.
- 需要在复杂的生物环境中发挥作用的灵敏和特定的探测器.
研究的目的:
- 为了合成和表征多色灭自结合 (QUAL) 探针.
- 评估 QUAL 探针识别和区分密切相关的 RNA 和 DNA 序列的能力.
- 展示QUAL探针在活细菌细胞中进行序列分析的应用.
主要方法:
- 合成与光染料结合的dabsyl激活灭自结合 (QUAL) 探针.
- 使用光成像测试QUAL探针,用于溶液中DNA和RNA序列的单核酸区分.
- 两种颜色的QUAL探针对在大肠杆菌中进行16SrRNA序列歧视的应用.
- 在现场分析活细菌细胞中的 QUAL 探针.
主要成果:
- 质量探测器仅在与相邻的目标部位结合时才会呈现光,从而通过核友移位来生成信号.
- 四种光染料结合物展示了对DNA和RNA标的单核酸歧视能力.
- 在聚合物珠上实现了DNA序列的基于颜色的歧视.
- 双色 QUAL 探测器在单核酸分辨率下成功区分了大肠杆菌中的 16S rRNA 序列,识别了数据库错误.
- 在没有额外的试剂或洗的情况下,QUAL探针成功地应用于活细菌细胞中.
结论:
- 质量探测器提供了一种多功能和灵敏的方法来检测和区分核酸序列.
- 质量探针的无酶,无试剂性质简化了检测协议.
- 质量探测器显示出在分子诊断,微生物鉴定和复杂生物系统中的序列分析中应用的巨大潜力.
相关概念视频
03:31Labeling DNA Probes
DNA probes are fragments of DNA labeled with a reporter tag to enable their detection or purification. The resulting labeled DNA probes can then hybridize to target nucleic acid sequences through complementary base-pairing, and may be used to recover or identify these regions.
Radioisotopes, fluorophores, or small molecule binding partners like biotin or digoxigenin, are the most widely used reporter tags for labeling DNA probes. These labels can be attached to the probe DNA molecule via...
Radioisotopes, fluorophores, or small molecule binding partners like biotin or digoxigenin, are the most widely used reporter tags for labeling DNA probes. These labels can be attached to the probe DNA molecule via...
02:57Southern Blot
Agarose gel electrophoresis is very useful in separating DNA fragments by size. Running a DNA ladder containing fragments of the known length alongside the sample helps determine the approximate length of the sample DNA fragments. However, additional steps are needed to verify the sequence identity of the sample DNA fragments.
Denatured DNA fragments must be transferred onto a carrier membrane from the gel to make it accessible to a probe - a small ssDNA fragment complementary to the target DNA...
Denatured DNA fragments must be transferred onto a carrier membrane from the gel to make it accessible to a probe - a small ssDNA fragment complementary to the target DNA...
02:34DNA 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...