Genome sequencing

基因组测序
  • 文章类型: Journal Article
    尽管当前的长读取测序技术具有长读取长度,可以促进基因组重建的组装,他们有很高的序列错误。虽然已经开发了具有不同观点的各种组装器,尚未对具有不同杂合性的二倍体基因组的具有长读数的装配体进行系统评估。这里,我们评估了一系列过程,包括基因组特征的估计,如基因组大小和杂合性,从头大会,抛光,去除等位基因重叠群,使用六个具有不同杂合度水平的基因组。我们评估了五个长只读汇编器(Canu,弗莱,miniasm,NextDenovo和Redbean)和五个结合了短读和长读的混合汇编程序(HASLR,MaSuRCA,悬铃木,SPAdes和WENGAN),并提出了根据杂合度构建单倍型表示的具体指南,然后抛光和清除杂物,使用稳定和高性能的汇编器:Redbean,Flye和MaSuRCA.
    Although current long-read sequencing technologies have a long-read length that facilitates assembly for genome reconstruction, they have high sequence errors. While various assemblers with different perspectives have been developed, no systematic evaluation of assemblers with long reads for diploid genomes with varying heterozygosity has been performed. Here, we evaluated a series of processes, including the estimation of genome characteristics such as genome size and heterozygosity, de novo assembly, polishing, and removal of allelic contigs, using six genomes with various heterozygosity levels. We evaluated five long-read-only assemblers (Canu, Flye, miniasm, NextDenovo and Redbean) and five hybrid assemblers that combine short and long reads (HASLR, MaSuRCA, Platanus-allee, SPAdes and WENGAN) and proposed a concrete guideline for the construction of haplotype representation according to the degree of heterozygosity, followed by polishing and purging haplotigs, using stable and high-performance assemblers: Redbean, Flye and MaSuRCA.
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  • 世界正处于抗生素后时期的风口浪尖。一个世纪前,在抗生素出现之前,噬菌体疗法是细菌感染的首选疗法。尽管噬菌体尚未被批准作为西医治疗,研究人员和临床医生已经开始预测噬菌体疗法.噬菌体是依靠细菌细胞代谢繁殖的病毒。它们为抗生素的使用提供了一种有希望的替代方法,和对抗细菌多药耐药性的优良抗菌选择。然而,不是每个噬菌体都适合噬菌体治疗。特别是,不应该使用prophages,因为它们可以使宿主细胞溶源性,而不是裂解它们。为患有各种传染病的患者提供足够的治疗选择,需要多种选择不同的噬菌体。虽然没有证据表明噬菌体颗粒诱导的直接毒性,研究哺乳动物细胞-噬菌体相互作用至关重要。这要求噬菌体制剂不含细菌细胞,毒素和其他化合物,以避免扭曲宿主反应。纯化病毒的阴性染色和电子显微镜仍然是鉴定噬菌体的金标准。有趣的是,基因组学极大地改变了我们对噬菌体生物学的理解。噬菌体基因组测序对于更全面地了解其生物学至关重要,并获得他们生活方式的确认。噬菌体的完整遗传测序将能够更好地理解参与细菌细胞裂解和死亡过程的噬菌体编码的蛋白质和生物分子(尤其是噬菌体裂解酶)。质谱可用于鉴定噬菌体结构蛋白。使用裂解噬菌体作为生物控制剂需要最合适和标准的方法来确保应用安全。这篇综述探讨了分子生物学领域的最新研究和方法,以分离和表征噬菌体,以促进其他研究人员的后续工作和实施。与此主题相关的专利已在文本中提及。
    The world is on the cusp of a post-antibiotic period. A century ago, before the advent of antibiotics, bacteriophage therapy was the treatment of choice for bacterial infections. Although bacteriophages have yet to be approved as a treatment in Western medicine, researchers and clinicians have begun to anticipate phage therapy. Bacteriophages are viruses that depend on bacterial cell metabolism to multiply. They offer a promising alternative to the use of antibiotics and an excellent antibacterial option for combating multidrug resistance in bacteria. However, not every phage is suitable for phage therapy. In particular, prophages should not be used because they can lysogenize host cells instead of lysing them. To offer adequate therapeutic options for patients suffering from various infectious diseases, a wide selection of different phages is needed. While there is no evidence of direct toxicity induced by phage particles, it is crucial to study mammalian cell-phage interactions. This requires phage preparations to be free of bacterial cells, toxins and other compounds to avoid skewing host responses. Negative staining of purified viruses and electron microscopy remain the gold standard in the identification of bacteriophages. Interestingly, genomics has greatly changed our understanding of phage biology. Bacteriophage genome sequencing is essential to obtain a complete understanding of the bacteriophages\' biology and to obtain confirmation of their lifestyle. Full genetic sequencing of bacteriophage will enable a better understanding of the phage-encoded proteins and biomolecules (especially phage lytic enzymes) involved in the process of bacterial cell lysis and death. Mass spectrometry can be used for the identification of phage structural proteins. The use of lytic phages as biocontrol agents requires the most appropriate and standard methods to ensure application safety. This review pursues recent research and methods in molecular biology for the isolation and characterization of phages to facilitate follow-up and implementation of work for other researchers. Patents related to this topic have been mentioned in the text.
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  • 文章类型: Journal Article
    OBJECTIVE: Next Generation Sequencing (NGS) is increasingly used for the diagnosis of rare genetic disorders. The aim of this study is to review the different approaches for economic evaluations of Next Generation Sequencing (NGS) in pediatric care used to date, to identify all costs, effects, and time horizons taken into account.
    METHODS: A systematic literature review was conducted to identify published economic evaluations of NGS applications in pediatric diagnostics, i.e. exome sequencing (ES) and/or genome sequencing (GS). Information regarding methodological approach, costs, effects, and time horizon was abstracted from these publications.
    RESULTS: Twenty-eight economic evaluations of ES/GS within pediatrics were identified. Costs included were mainly restricted to direct in-hospital healthcare costs and varied widely in inclusion of sort of costs and time-horizon. Nineteen studies included diagnostic yield and eight studies included cost-effectiveness as outcome measures. Studies varied greatly in terms of included sort of costs data, effects, and time horizon.
    CONCLUSIONS: Large differences in inclusion of cost and effect parameters were identified between studies. Validity of outcomes can therefore be questioned, which hinders valid comparison and widespread generalization of conclusions. In addition to current health economic guidance, specific guidance for evaluations in pediatric care is therefore necessary to improve the validity of outcomes and furthermore facilitate comparable decision-making for implementing novel NGS-based diagnostic modalities in pediatric genetics and beyond.
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  • 文章类型: Journal Article
    基因组学赋予了许多关于非模型物种生物学的研究计划。反过来,基因组学以参考序列和所谓的“基因组计划”创建的辅助信息为基础。最可靠的基因组计划是作为积极研究计划的一部分创建的,旨在解决特定问题,但它们的寿命延长了过去的出版物。在这篇观点论文中,我概述了促进维持基因组群落的四个关键见解:计算能力的关键作用,构建基因组资源的迭代过程,社区参与的价值和手工策展的重要性。一起来看,这些想法可以并且确实确保基因组计划的寿命,并且不断增长的非模型物种社区可以使用它们来集中讨论其未来的基因组基础设施。
    Many research programs on non-model species biology have been empowered by genomics. In turn, genomics is underpinned by a reference sequence and ancillary information created by so-called \"genome projects\". The most reliable genome projects are the ones created as part of an active research program and designed to address specific questions but their life extends past publication. In this opinion paper I outline four key insights that have facilitated maintaining genomic communities: the key role of computational capability, the iterative process of building genomic resources, the value of community participation and the importance of manual curation. Taken together, these ideas can and do ensure the longevity of genome projects and the growing non-model species community can use them to focus a discussion with regards to its future genomic infrastructure.
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