使用钻石TM核酸染料预测带提升机上的触摸DNA的证据水平
Isla Madden1, Duncan Taylor2, Natasha Mitchell3
1College of Science and Engineering, Flinders University of South Australia, Bedford Park, South Australia 5042, Australia.
Forensic science international. Genetics
|February 9, 2024
概括
法医科学家使用钻石核酸染料 (DD) 光进行了探索,以预测磁带提升的DNA产量. 虽然光显示出有前途,但显微细胞计数,而不是光,识别了非试验性服装样本,这表明效率的自动化.
科学领域:
- 法医科学 法医科学 法医科学
- 分子生物学分子生物学
- 生物技术是生物技术.
背景情况:
- 在法医案例工作中,触摸DNA恢复中,Tapelifting至关重要.
- 目前,只有大约30%的带提升器能产生可用的DNA配置文件,这导致积压和成本.
- 有效地识别非试验性带式提升器对于法医工作流的优化至关重要.
研究的目的:
- 评估钻石核酸染料 (DD) 光能否预测磁带提升的DNA产量和分析成功.
- 为了评估宏观和微观光测量的有效性.
- 确定一种可靠的方法来识别非试验性带,特别是来自服装的带.
主要方法:
- 采集了受控,半受控和不受控制的样本 (唾液,指纹,服装) 使用带式提取.
- 样品用钻石核酸染料 (DD) 染色.
- 宏观光是用Polilight测量的,微观光是用Dino Lite显微镜测量的. 还进行了染色角细胞的细胞计数.
主要成果:
- 宏观和微观DD光可以预测DNA产量和对受控样品的分析结果.
- 预测能力下降的样本控制较少;服装带提升显示光受非细胞碎片的影响.
- 对服装来说,<500个细胞/面板升降器的门被确定为非试验性结果的潜在指标.
结论:
- DD光显示出潜力,但对于复杂的法医样本,如服装,其可靠性较低.
- 微观细胞计数虽然是劳动密集型的,但对于非试验性服装带提升来说,它是一个更可靠的指标.
- 建议使用图像分析和人工神经网络 (ANN) 来自动化细胞计数,以提高效率并降低污染风险.
相关概念视频
Labeling 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...
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...
PCR - Polymerase Chain Reaction
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