Molecular techniques

  • 文章类型: Journal Article
    传染病的出现和传播,特别是源自野生动物的人畜共患疾病,对全球健康和经济构成重大威胁。这篇综述探讨了蜱作为媒介在将病原体传播给人类中的关键作用,牲畜,和野生动物以及在它们的鉴定中使用分子技术。蜱虫感染通过降低动物生产力导致经济损失,贫血,和皮革质量恶化。此外,蜱充当包括病毒在内的各种病原体的储库,细菌,真菌,原生动物,和线虫,导致克里米亚-刚果出血热等疾病的传播,蜱传脑炎,还有非洲猪瘟。野生动物之间的接口,牲畜,人类促进了人畜共患病原体的传播,游牧和牧民的生活方式加剧了野生动物和家畜之间的相互作用。动物在景观中的这种运动增强了蜱矢量的分散,增加不同人群的病原体暴露风险。历史上,尽管存在诸如物种重叠和变异性等限制,但撒哈拉以南非洲的tick识别仍依赖于形态特征。分子技术提供了更精确的物种鉴定手段,为有效的蜱和病原体管理策略提供关键数据。将分子方法纳入蜱虫研究增强了我们对蜱虫多样性的理解,分布模式,和病原体动态。这些知识对于制定有针对性的干预措施以减轻蜱传疾病对全球公共和兽医健康的影响至关重要。
    The emergence and spread of infectious diseases, particularly zoonotic diseases originating from wildlife, pose significant threats to global health and economy. This review examines the pivotal role of ticks as vectors in transmitting pathogens to humans, livestock, and wildlife and the use of molecular techniques in their identification. Tick infestations result in economic losses through reduced animal productivity, anemia, and quality deterioration of hides. Furthermore, ticks serve as reservoirs for a wide range of pathogens including viruses, bacteria, fungi, protozoa, and nematodes, contributing to the transmission of diseases such as Crimean-Congo hemorrhagic fever, tick-borne encephalitis, and African swine fever among others. The interface between wildlife, livestock, and humans facilitates the transmission of zoonotic pathogens, exacerbated by nomadic and pastoralist lifestyles that promote interactions between wildlife and domestic animals. This movement of animals across landscapes enhances the dispersion of tick vectors, increasing the risk of pathogen exposure for diverse populations. Historically, tick identification in sub-Saharan Africa has relied on morphological characteristics despite limitations such as species overlap and variability. Molecular techniques offer a more precise means of species identification, providing critical data for effective tick and pathogen management strategies. Integrating molecular approaches into tick research enhances our understanding of tick diversity, distribution patterns, and pathogen dynamics. This knowledge is essential for developing targeted interventions to mitigate the impact of tick-borne diseases on public and veterinary health worldwide.
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  • 文章类型: Journal Article
    脓毒症是一种经常误诊的异质性综合征。现场护理(POC)诊断测试通常用于指导决策,包括宿主生物标志物和分子诊断。
    已建立和新出现的脓毒症生物标志物的诊断和预后准确性,包括降钙素原(PCT)可溶性尿激酶纤溶酶原激活物受体(suPAR),presepsin,TRAIL/IP-10/CRP,MxA,和MxA-CRP,在这篇综述中进行了分析。还介绍了使用聚合酶链反应(PCR)测定法鉴定病原体的两种流行分子技术的临床实用性:FILMARRAY和QIAstat-DxRP。
    在日常临床常规中联合使用POC生物标志物与分子诊断的日益增加的益处似乎在缩短周转时间方面优于常规实践。及时诊断,并及时给予适当的治疗。然而,这必须在未来的调查中进一步证明。然而,POC测试的成本效益和高的假阳性和阴性结果率,表明需要进行全面的临床评估。
    UNASSIGNED: Sepsis is a heterogeneous syndrome often misdiagnosed. Point-of-care (POC) diagnostic tests are commonly used to guide decision and include host biomarkers and molecular diagnostics.
    UNASSIGNED: The diagnostic and prognostic accuracy of established and emerging biomarkers for sepsis, including procalcitonin (PCT) soluble urokinase plasminogen activator receptor (suPAR), presepsin, TRAIL/IP-10/CRP, MxA, and MxA-CRP, are analyzed in this review. The clinical utility of the two prevalent molecular techniques for pathogens identification using polymerase chain reaction (PCR) assays is also presented: FILMARRAY and QIAstat-Dx RP.
    UNASSIGNED: The rising benefits of the combined use of POC biomarkers with molecular diagnostics in daily clinical routine appear to outperform conventional practices in terms of reduced turnaround time, timely diagnosis, and prompt administration of the appropriate treatment. Yet, this must be further demonstrated in future investigations. However, the cost-effectiveness of POC tests and the high rate of false positive and negative results, indicate the need for a comprehensive clinical evaluation.
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  • 文章类型: Journal Article
    对植物病毒进行准确及时的诊断是实施高效管理策略的前提,考虑到贸易全球化和气候变化等因素,这些因素促进了病毒的传播,导致全球每年数十亿美元的农业产量损失。由于不同的症状和与植物非生物胁迫的混淆,单独的症状诊断可能不可靠。准确可靠地检测植物病毒至关重要,而且时间短。要实现这一点,必须全面了解各种检测方法。酶联免疫吸附测定(ELISA),作为一种检测病毒的方法已经变得越来越流行,但面临着抗体可用性等限制,成本,样品体积,和时间。诸如聚合酶链反应(PCR)之类的先进技术已超过ELISA,其各种敏感变体。在过去的十年里,基于核酸的分子方法已经普及,并迅速取代了其他技术,例如用于检测植物病毒的血清学技术由于其特异性和准确性。因此,这篇综述使读者能够了解从PCR及其变体开始的每种分子技术的优缺点,随着各种等温扩增,然后是DNA微阵列,和下一代测序(NGS)。由于新技术的发展,NGS变得越来越容易和更便宜,看起来这种方法可能会取代其他方法,成为进行定期诊断的首选方法。NGS也正在成为鉴定新病毒的首选方法。
    在线版本包含补充材料,可在10.1007/s13337-024-00863-0获得。
    Precise and timely diagnosis of plant viruses is a prerequisite for the implementation of efficient management strategies, considering factors like globalization of trade and climate change facilitating the spread of viruses that lead to agriculture yield losses of billions yearly worldwide. Symptomatic diagnosis alone may not be reliable due to the diverse symptoms and confusion with plant abiotic stresses. It is crucial to detect plant viruses accurately and reliably and do so with little time. A complete understanding of the various detection methods is necessary to achieve this. Enzyme-linked immunosorbent assay (ELISA), has become more popular as a method for detecting viruses but faces limitations such as antibody availability, cost, sample volume, and time. Advanced techniques like polymerase chain reaction (PCR) have surpassed ELISA with its various sensitive variants. Over the last decade, nucleic acid-based molecular methods have gained popularity and have quickly replaced other techniques, such as serological techniques for detecting plant viruses due to their specificity and accuracy. Hence, this review enables the reader to understand the strengths and weaknesses of each molecular technique starting with PCR and its variations, along with various isothermal amplification followed by DNA microarrays, and next-generation sequencing (NGS). As a result of the development of new technologies, NGS is becoming more and more accessible and cheaper, and it looks possible that this approach will replace others as a favoured approach for carrying out regular diagnosis. NGS is also becoming the method of choice for identifying novel viruses.
    UNASSIGNED: The online version contains supplementary material available at 10.1007/s13337-024-00863-0.
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  • 文章类型: Journal Article
    干旱胁迫是影响植物生长的最关键的非生物因素之一。生产力,植物的生存。草种在种植系统的可持续集约化中起着重要作用。本文重点介绍了草种的特定耐旱性特征以及流行的经典和分子方法在干旱胁迫下对其进行遗传改良的应用。一般来说,草种通过利用包括根系生长变化在内的多种策略来适应干旱胁迫,光合色素,抗氧化酶的激活,和相容渗透物质的积累。它们还具有夏季休眠的其他特定特征,干旱恢复,和坚持,导致长期干旱后的干旱适应。对不同草的研究,表明上述大多数性状通常与耐旱性呈正相关。此外,据报道,它们中的大多数在不同的牧草中具有较高的遗传力。因此,在鉴定耐旱性基因型时,可能会考虑一个有效的指标。最近,高通量成像表型和先进的分子技术,如基因分型测序(GBS),RNA测序,全基因组关联研究,和基因组编辑帮助常规育种方法提高准确性,选择效率,遗传增益,以及开发耐旱品种的育种计划的速度。
    Drought stress is one of the most critical abiotic factors which negatively impacts on growth, productivity, and survival of plants. Grass species have an important role in the sustainable intensification of cropping systems. This review focus on the specific drought tolerance characteristics in grass species and application of prevalent classical and molecular methods for genetic improvement of them to drought stress. Generally, grass species adapt to drought stress by utilizing more than one strategy including of changes in the root growth, photosynthetic pigments, activation of antioxidant enzymes, and accumulation of compatible osmolytes. They also have other specific characteristics consisted of summer dormancy, drought recovery, and persistence, which lead to drought adaptation after prolonged drought. Studies on different grasses, indicated that most of above mentioned traits usually have positive correlation with drought tolerance. Also, high heritability has been reported for most of them in different grasses. Therefore, an effective index might be considering in identification of drought tolerance genotypes. Recently, high-throughput imaging phenotyping and advanced molecular techniques such as genotyping-by-sequencing (GBS), RNA sequencing, genome-wide association study, and genome editing help conventional breeding methods to increase the accuracy, selection efficiency, genetic gains, and speed of breeding programs for developing drought tolerant cultivars.
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  • 文章类型: Case Reports
    我们在这里报告了一例罕见的由健康的66岁男性链球菌感染引起的脊椎盘炎病例。由于脓肿导致神经功能缺损,这需要立即手术干预,在所有血液和组织培养均为阴性时,对手术样本进行了靶向16SrRNA的PCR.这种分子分析允许鉴定这种罕见的链球菌,mitis组的成员和口腔共生,尽管在人类感染病例中很少报道,但其致病性仍不确定,主要是菌血症和心内膜炎.值得注意的是,我们的案例以没有合并症为特征,尽管患者的病史与牙科入口相符。这种情况再次说明,当培养物仍然不确定时,16SrRNAPCR对于记录骨关节感染中的病原体有很大帮助。我们在本文中回顾了有关S.cristatus引起的骨关节感染的数据,并讨论了分子技术在脊柱椎间盘炎诊断中的作用。
    We report here a rare case of spondylodiscitis due to Streptococcus cristatus in a healthy 66-year-old male. Due to an abscess causing neurological deficit, which required immediate surgical intervention, a PCR targeting 16S rRNA was performed on the surgical samples as all blood and tissue cultures remained negative. This molecular assay allowed for the identification of this rare Streptococcus, a member of the mitis group and commensal of the oral cavity, whose pathogenicity remains uncertain although it has been seldom reported in cases of human infections, mostly bacteremia and endocarditis. Notably, our case is distinguished by the absence of comorbidities, although the patient\'s history was compatible with a dental portal of entry. This case illustrates once more that 16S rRNA PCR can be of great help for documenting the causative pathogen in osteoarticular infections when cultures remain inconclusive. We reviewed in this article the data regarding osteoarticular infections due to S. cristatus and discussed the role of molecular technique in the diagnosis of spondylodiscitis.
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  • 文章类型: Journal Article
    该综述深入研究了定量评估晚期糖基化终产物受体(RAGE)的细胞内效应子和细胞反应的方法,参与一系列生理和病理过程的重要跨膜受体。RAGE结合晚期糖基化终产物(AGEs)和其他配体,进而激活影响细胞反应如炎症的不同下游信号通路,氧化应激,和免疫反应。评论文章讨论了RAGE激活的细胞内信号通路,然后是RAGE信号在各种疾病中的差异激活。这将最终指导研究人员开发针对与RAGE激活相关的疾病的有针对性和有效的干预措施。Further,我们已经讨论了PCR,西方印迹,和显微镜检查参与下游信号传导的各种分子可以用来监测,诊断,并探索涉及具有独特翻译后修饰的蛋白质的疾病。这篇综述文章强调了迫切需要发展涉及RAGE的疾病检测和管理的分子方法。
    The review delves into the methods for the quantitative assessment of intracellular effectors and cellular response of Receptor for Advanced Glycation End products (RAGE), a vital transmembrane receptor involved in a range of physiological and pathological processes. RAGE bind to Advanced Glycation End products (AGEs) and other ligands, which in turn activate diverse downstream signaling pathways that impact cellular responses such as inflammation, oxidative stress, and immune reactions. The review article discusses the intracellular signaling pathways activated by RAGE followed by differential activation of RAGE signaling across various diseases. This will ultimately guide researchers in developing targeted and effective interventions for diseases associated with RAGE activation. Further, we have discussed how PCR, western blotting, and microscopic examination of various molecules involved in downstream signaling can be leveraged to monitor, diagnose, and explore diseases involving proteins with unique post-translational modifications. This review article underscores the pressing need for advancements in molecular approaches for disease detection and management involving RAGE.
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  • 文章类型: Journal Article
    21世纪死亡率最高的疾病之一是癌症。全球范围内,分子方法被广泛用于治疗癌症相关疾病,关于这个主题的研究机构每年都在增长。需要对支持与癌症有关的疾病的分子方法的数据进行全面而重要的总结。
    为了指导临床实践和未来的研究,重要的是检查和总结评估分子方法治疗癌症相关疾病的有效性和安全性的系统评价(SRs).
    我们开发了一种全面的搜索策略,可以从PubMed等电子数据库中查找相关文章,谷歌学者,WebofScience(WoS),或者Scopus.我们浏览了文献,并确定了癌症遗传学中哪些诊断方法特别可靠。我们使用了像“癌症遗传学”这样的短语,遗传易感性,遗传性癌症,癌症风险评估,\'癌症诊断工具\',癌症筛查,生物标志物,和分子诊断,综述和荟萃分析评估分子疗法对癌症相关疾病的疗效和安全性。仅考虑不需要遗传或分子诊断的治疗方式的研究属于排除标准。
    这篇综合综述的结果清楚地证明了分子方法在癌症遗传学领域的转化作用。这篇综述强调了这些技术如何使研究人员和临床医生能够识别和理解导致恶性肿瘤的关键遗传改变。从点突变到结构变异。这些见解有助于确定关键的致癌驱动因素和潜在的治疗目标,从而为能够显著改善患者预后的精准医学方法打开了大门。
    搜索没有指定包含出版物的时间表,它可能错过了癌症分子方法领域的最新进展或变化。因此,它可能没有包括该领域的最新发展。
    在对癌症遗传学中的分子方法进行了深入研究之后,很明显,这些尖端技术彻底改变了肿瘤学领域,为研究人员和临床医生提供强大的工具,在基因水平上解开癌症的复杂性。分子方法技术的整合不仅增强了我们对癌症病因的理解,programming,和治疗反应,但也为个性化医疗和靶向治疗开辟了新的途径,改善患者预后。
    UNASSIGNED: One of the ailments with the greatest fatality rates in the 21st century is cancer. Globally, molecular methods are widely employed to treat cancer-related disorders, and the body of research on this subject is growing yearly. A thorough and critical summary of the data supporting molecular methods for illnesses linked to cancer is required.
    UNASSIGNED: In order to guide clinical practice and future research, it is important to examine and summarize the systematic reviews (SRs) that evaluate the efficacy and safety of molecular methods for disorders associated to cancer.
    UNASSIGNED: We developed a comprehensive search strategy to find relevant articles from electronic databases like PubMed, Google Scholar, Web of Science (WoS), or Scopus. We looked through the literature and determined which diagnostic methods in cancer genetics were particularly reliable. We used phrases like \'cancer genetics\', genetic susceptibility, Hereditary cancer, cancer risk assessment, \'cancer diagnostic tools\', cancer screening\', biomarkers, and molecular diagnostics, reviews and meta-analyses evaluating the efficacy and safety of molecular therapies for cancer-related disorders. Research that only consider treatment modalities that don\'t necessitate genetic or molecular diagnostics fall under the exclusion criteria.
    UNASSIGNED: The results of this comprehensive review clearly demonstrate the transformative impact of molecular methods in the realm of cancer genetics.This review underscores how these technologies have empowered researchers and clinicians to identify and understand key genetic alterations that drive malignancy, ranging from point mutations to structural variations. Such insights are instrumental in pinpointing critical oncogenic drivers and potential therapeutic targets, thus opening the door for methods in precision medicine that can significantly improve patient outcomes.
    UNASSIGNED: The search does not specify a timeframe for publication inclusion, it may have missed recent advancements or changes in the field\'s landscape of molecular methods for cancer. As a result, it may not have included the most recent developments in the field.
    UNASSIGNED: After conducting an in-depth study on the molecular methods in cancer genetics, it is evident that these cutting-edge technologies have revolutionized the field of oncology, providing researchers and clinicians with powerful tools to unravel the complexities of cancer at the genetic level. The integration of molecular methods techniques has not only enhanced our understanding of cancer etiology, progression, and treatment response but has also opened new avenues for personalized medicine and targeted therapies, leading to improved patient outcomes.
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  • 文章类型: Case Reports
    我们描述了一名46岁的患者,患有IDH野生型弥漫性浸润性非典型畸胎瘤/横纹肌样瘤(AT/RT),SHH-1B分子亚型。将讨论成人患者的异常组织学和随后的诊断。
    We describe a 46-year-old patient with an IDH-wildtype diffusely infiltrating atypical teratoid/rhabdoid tumour (AT/RT), SHH-1B molecular subtype. The unusual histology and subsequent diagnosis in an adult patient will be discussed.
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  • 文章类型: Journal Article
    浮选和矿物加工中的微生物可能会显著影响金属精矿的品位和产量。然而,研究这种现象需要工作技术来将微生物及其DNA从它们强烈粘附的矿物颗粒中分离出来。我们开发了一种新方法,利用阴离子纳米纤维素的竞争特性来阻止DNA吸附到矿石加工中的矿物颗粒并将微生物细胞从矿物颗粒中分离出来。总的来说,与使用商业试剂盒(KIT)提取的Qubit测定的检测限以下的DNA量相比,使用定制阴离子纳米纤维素方法(CM)获得了多达1ngDNAmL-1样品。同样,与KIT提取相比,通过qPCR从CM处理的样品中检测到0.5-4个数量级的细菌16S和真菌5.8SrRNA基因拷贝。还观察到CM和KIT提取样品之间检测到的微生物群落结构的明显差异。针对矿物土壤优化的商业试剂盒易于使用且时间高效,但可能会错过相当一部分微生物群落。竞争试剂如阴离子纳米纤维素可降低微生物或其DNA与矿物质之间的相互作用,并提供矿物加工环境中微生物群落的全面视图。
    Microorganisms in flotation and minerals processing may significantly affect the grade and yield of metal concentrates. However, studying the phenomena requires working techniques to detach microorganisms and their DNA from mineral particles to which they strongly adhere. We developed a new method utilizing the competitive properties of anionic nanocellulose to block sorption of DNA to and detach microbial cells from mineral particles from ore processing. In general, up to one ng DNA mL-1 sample was obtained with the custom anionic nanocellulose method (CM) compared to DNA amounts below the Qubit assay\'s detection limit for extractions with a commercial kit (KIT). Similarly, 0.5-4 orders of magnitude more bacterial 16S and fungal 5.8S rRNA gene copies were detected by qPCR from CM treated samples compared to KIT extractions. A clear difference in the detected microbial community structure between CM and KIT extracted samples was also observed. Commercial kits optimized for mineral soils are easy to use and time efficient but may miss a considerable part of the microbial communities. A competing agent such as anionic nanocellulose may decrease the interaction between microorganisms or their DNA and minerals and provide a comprehensive view into the microbial communities in mineral processing environments.
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  • 文章类型: Journal Article
    已证明对金黄色葡萄球菌鼻腔携带的患者进行筛查可有效预防该细菌的交叉污染和内源性感染。本研究的目的是评估BDMAXStaphSR测定与液体Amies洗脱拭子的性能,在重症监护病房患者的常规护理期间服用。直接和预富集培养物用作筛选金黄色葡萄球菌和耐甲氧西林金黄色葡萄球菌(MRSA)的参考方法。BDMAXStaphSR测定和培养物之间的差异结果通过使用XpertSANasalComplete测定来解决。本研究包括从409名患者中抽取的总共607个鼻拭子。与培养方法相比,BDMAXStaphSR检测对金黄色葡萄球菌筛查的敏感性和特异性分别为92.5%和91.7%,MRSA筛查分别为94.7%和98.3%,分别。在52份(8.6%)标本中,培养结果与BDMAXStaphSR测定结果存在差异,包括13(25%),其中BDMAXStaphSR分析的结果已通过XpertSANasalComplete测试得到确认。这项前瞻性研究表明,BDMAXStaphSR测定对于用液体Amies洗脱拭子采集的鼻样品中的金黄色葡萄球菌和MRSA检测是可靠的。
    Screening patients for S. aureus nasal carriage has proved effective in preventing cross-contamination and endogenous infection with this bacterium. The aim of this study was to assess the performance of the BD MAX StaphSR assay with liquid Amies elution swabs, taken during routine care of intensive care unit patients. Direct and pre-enriched cultures were used as reference methods to screen for S. aureus and methicillin-resistant S. aureus (MRSA). Discrepant results between the BD MAX StaphSR assay and cultures were resolved by using the Xpert SA Nasal Complete assay. A total of 607 nasal swabs taken from 409 patients were included in this study. Compared to culture methods, the sensitivity and specificity of the BD MAX StaphSR assay were 92.5% and 91.7% for S. aureus screening, and 94.7% and 98.3% for MRSA screening, respectively. In 52 (8.6%) specimens, there was a discrepancy between the results of cultures and the BD MAX StaphSR assay, including 13 (25%) where the results of the BD MAX StaphSR assay were confirmed by the Xpert SA Nasal Complete test. This prospective study showed that the BD MAX StaphSR assay is reliable for S. aureus and MRSA detection from nasal samples taken with liquid Amies elution swabs.
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