species

物种
  • 文章类型: Journal Article
    为全面揭示和利用我国枸杞属植物资源,这项研究确定并比较了单糖的含量,多糖,蛋白质,类胡萝卜素,有机酸,8种不同枸杞的干果中含有酚类物质。此外,包括百果重量在内的特征,形状指数,并测量了种子与果实的比例,并评估了化学成分含量与果实性状之间的相关性。结果表明,L.barbarumvar。auranticarpum,和L.dasystemumvar。金霉属是单糖含量高的物种。L.barbarum和L.barbarumvar。金木是总多糖含量高的物种,L.barbarum是类胡萝卜素含量高的物种。云南和中国。potaninii具有高含量的可溶性蛋白质。L.truncum,L.dasystemum,和L.barbarum显示高含量的有机酸和酚。L.barbarum和L.barbarumvar。auranticarpum显示出高果实重量,而L.yunnanense和L.chinense的种子与果实的比例很高。多变量统计分析表明,多糖,类胡萝卜素,百果重,种子与果实的比例,东pol碱,果糖,5-O-阿魏酸,山奈酚-3-O-鲁丁苷,scopoletin,隐绿原酸,咖啡酸是不同品种枸杞果实中的主要差异化合物。此外,相关分析结果表明,果实性状与化合物含量之间存在很强的相关性。具体来说,百果重与总多糖和石膏矿含量呈正相关。籽果比与芦丁含量呈负相关,山奈酚-3-O-鲁丁苷,果糖,和葡萄糖,与琥珀酸的含量呈正相关,可溶性蛋白质,和玉米黄质.结果表明,化合物在8种枸杞果实中呈现不同的分布规律。本研究为综合开发利用提供了依据,有针对性的育种,和枸杞植物的增值应用。
    To comprehensively reveal and utilize the plant resources of Lycium in China, this study determined and compared the content of monosaccharides, polysaccharides, proteins, carotenoids, organic acids, and phenols in the dried fruits of 8 different Lycium species. Furthermore, the traits including the hundred-fruit weight, shape index, and the ratio of seed to fruit were measured, and the correlations between the content of chemical compounds and fruit traits were assessed. The results showed that L. truncatum, L. barbarum var. auranticarpum, and L. dasystemum var. rubricaulium were the species with high content of monosaccharides. L. barbarum and L. barbarum var. auranticarpum were the species with high content of total polysaccharides, and L. barbarum was the species with high content of carotenoids. L. yunnanense and L. chinense var. potaninii had high content of soluble proteins. L. truncatum, L. dasystemum, and L. barbarum showed high content of organic acids and phenols. L. barbarum and L. barbarum var. auranticarpum demonstrated high fruit weight, while L. yunnanense and L. chinense had high ratios of seed to fruit. The multivariate statistical analysis indicated that polysaccharides, carotenoids, hundred-fruit weight, ratio of seed to fruit, scopolamine, fructose, 5-O-feruloylquinic acid, kaempferol-3-O-rutinoside, scopoletin, cryptochlorogenic acid, and caffeic acid were the main differential compounds in the fruits among different species of Lycium. Moreover, the results of correlation ananysis showed strong correlations between fruit traits and compound content. Specifically, the hundred-fruit weight had positive correlations with the content of total polysaccharides and scopola-mine. The ratio of seed to fruit was negatively correlated with the content of rutin, kaempferol-3-O-rutinoside, fructose, and glucose and positively correlated with the content of succinic acid, soluble proteins, and zeaxanthin. The results implied that chemical compounds presented different distribution patterns in the fruits of 8 Lycium species. This study provides a basis for the comprehensive development and utilization, targeted breeding, and value-added application of Lycium plants.
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  • 文章类型: Journal Article
    进行这项研究是为了确定濒临灭绝的Oryxbeisa(Rüppell,1835),和濒临灭绝的Litocraniuswalleri(Brooke,1878)杰拉尔国家公园不确定的全球人口估计,埃塞俄比亚东南部。建立了系统线截面,其截面长度范围为2.3至6.8km(总共165.4km长,截断后的观测距离为150m)。AIC和卡方p值的组合用作距离采样软件中密度/种群大小估计的模型选择标准。最低的AIC,ΔAIC(接近于零),选择卡方检验(p值>.05)并进行充分的模型拟合。在旱季,观察到的最低数量是67只小牛。在雨季,最大的观测值为gerenuk的349个人。大羚羊的最小检测概率是在雨季(p=76±26),在两个季节中,gerenuk的最小检测概率为(p≥75±1)。对所研究物种进行的两季合并密度分析显示(0.85±0.34,1.24±0.47,beisaoryx/km2),(3.82±0.6,4.88±0.7gerenuk/km2),分别。从研究结果可以得出结论,GNP是先前未被发现的濒临灭绝的贝萨羚羊和濒临灭绝的gerenuk的健康种群的家园。所以建议进行深入的人口研究,包括国家公园中的其他物种及其栖息地,为了设计声音,该地区野生动物资源的可持续保护措施。
    The study was conducted to determine the population size of endangered Oryx beisa (Rüppell, 1835), and near-threatened Litocranius walleri (Brooke, 1878) of uncertain global population estimates in Geralle National Park, southeastern Ethiopia. Systematic line transects were established with a transect length range of 2.3 to 6.8 km long (a total of 165.4 km long with a sighting distance of 150 m after truncation). The combination of AIC and chi-square p-values was used as model selection criteria for density/population size estimation in distance sampling software. The lowest AIC, ∆AIC (close to zero), and Chi-square tests (p-value > .05) were selected with adequate model fit. The minimum observation was 67 individuals of beisa oryx in the dry season. The maximum observation was 349 individuals of gerenuk during the wet season. The minimum detection probability of oryx was in the wet season (p â = 76 ± 26), and the minimum detection probability of gerenuk was (p â = 75 ± 1) in both seasons. The two-season pooled density analyzed for studied species indicated (0.85 ± 0.34, 1.24 ± 0.47, beisa oryx/km2), and (3.82 ± 0.6, 4.88 ± 0.7 gerenuk/km2) in dry and wet seasons, respectively. It can be concluded from the results of the study that GNP is home to previously undiscovered healthy populations of the endangered beisa oryx and near-threatened gerenuk. So it is recommended to undergo in-depth population studies, including other species available in the national park and their habitat components, so as to design sound, sustainable conservation measures for the wildlife resources in the area.
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  • 文章类型: Journal Article
    弯曲杆菌是革兰氏阴性菌,被认为是从家禽样品中分离出的主要属,并与胃肠炎有关。由于传统栽培方法耗时、技术要求高的问题,一种快速可行的方法来识别和区分密切相关的spp。包括弯曲杆菌,胎儿弯曲杆菌,空肠弯曲杆菌是必需的。本研究通过靶向OrfA,使用基于培养和预富集的Quadraplex实时PCR分析了鸡肉和绵羊肉类样品(n=125),CstA,HipO,和大肠杆菌的16个SrRNA基因,C.胎儿,空肠杆菌和弯曲杆菌。分别。通过培养和实时PCR对125个鸡肉和羊肉样品进行分析显示,两种方法的结果之间具有很高的一致性。本研究表明,弯曲杆菌的流行率很高(鸡肉和肉类分别为35%和32%),其中空肠弯曲杆菌最丰富。反应效率在90%至110%之间,在空肠弯曲菌中检测低至8.9fg。使用所描述的Quadraplex实时PCR方法可以满足对绵羊和鸡肉中的快速检测和辨别方法的需求。
    Campylobacter is gram-negative bacteria considered the predominant genera isolated from poultry samples and associated with gastroenteritis. Due to the problems in conventional cultural methods of time-consuming and technically demanding requirements, a rapid and feasible method for their identification and discrimination of the closely related spp. Including Campylobacter coli, Campylobacter fetus, and Campylobacter jejuni is needed. This study analyzes the chicken and sheep meats samples (n = 125) using culture and pre-enrichment-based Quadraplex real-time PCR by targeting OrfA, CstA, HipO, and 16 S rRNA genes of C. coli, C. fetus, C. jejuni and Campylobacter spp. Respectively. The analysis of 125 chicken and sheep meat samples by culture and real-time PCR showed high concordance between the results of the two methods. The present study show high prevalence of Campylobacter species (35% and 32% from chicken and meat respectively) of which C. jejuni were the most abundant. Reaction efficiencies were between 90 and 110%, and detect as low as 8.9 fg in C. jejuni. The need for quick detection and discrimination methods in sheep and chicken meat can be met using the described Quadraplex real-time PCR methodology.
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  • 文章类型: Journal Article
    背景:患有环磷酰胺失败的淋巴瘤的狗,阿霉素,长春新碱,和泼尼松化疗(CHOP)在完成方案之前通常被认为具有较差的长期结果,但之前没有研究评估早期复发对接受抢救化疗的患者的无进展间期(PFI)或总生存时间(OST)的影响.
    目的:将多中心淋巴瘤犬的抢救治疗结果与一线CHOP化疗后的结果相关联。
    方法:数据来自先前对187只接受一线CHOP化疗然后接受洛莫司汀(CCNU)的多中心淋巴瘤犬的6项回顾性或前瞻性研究,L-天冬酰胺酶和泼尼松(LAP),或rabacfosadine(RAB,Tanovea),有或没有泼尼松或L-天冬酰胺酶。
    结果:CHOP化疗开始后的PFI与进展后的反应率显着相关,PFI,以及两种救援方案的救援后生存时间(ST)。免疫表型(B-vsT细胞)与反应无显著相关,LAP的PFI或OST,但与RAB的反应和PFI显著相关。
    结论:在一线CHOP化疗期间或之后经历短PFI的狗对抢救治疗的反应率较低,较短的PFI和ST。免疫表型对LAP的预后无显著影响,但与RAB的PFI相关。
    BACKGROUND: Dogs with lymphoma that fail cyclophosphamide, doxorubicin, vincristine, and prednisone chemotherapy (CHOP) before completion of their protocol are commonly thought to have poor long-term outcome, but no previous studies have evaluated the effect of early relapse on progression-free interval (PFI) or overall survival time (OST) for patients undergoing rescue chemotherapy.
    OBJECTIVE: Correlate rescue treatment outcomes in dogs with multicentric lymphoma with outcomes after 1st-line CHOP chemotherapy.
    METHODS: Data were collected from 6 previous retrospective or prospective studies in 187 dogs with multicentric lymphoma that received 1st-line CHOP chemotherapy and then received either lomustine (CCNU), L-asparaginase and prednisone (LAP), or rabacfosadine (RAB, Tanovea), with or without prednisone or L-asparaginase.
    RESULTS: The PFI after initiation of CHOP chemotherapy was significantly associated with response rate postprogression, PFI, and postrescue survival time (ST) for both rescue protocols. Immunophenotype (B- vs T-cell) was not significantly associated with response, PFI or OST for LAP but was significantly associated with response and PFI for RAB.
    CONCLUSIONS: Dogs that experience short PFI during or after 1st-line CHOP chemotherapy had lower response rates to rescue treatment, with shorter PFI and ST. Immunophenotype did not significantly affect outcome with LAP but was associated with PFI for RAB.
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  • 文章类型: Journal Article
    随着DNA测序技术的不断发展,基因组序列数据在细菌和古细菌的分类和鉴定中的作用已变得越来越重要。在引入EzBioCloud六年后,通过质量控制的16SrRNA基因和基因组序列,代表细菌和古菌的分类学层次结构的集成平台,我们提供了一个更新的版本,这进一步完善和扩展了其能力。当前的更新认识到对准确分类学信息的需求日益增长,因为定义物种越来越依赖于基因组序列比较。我们还采用了一种先进的策略来解决代表性不足或研究较少的血统,加强我们数据库的全面性和准确性。我们严格的质量控制协议仍然存在,其中来自NCBI装配数据库的全基因组装配体经过严格的筛选以去除低质量的序列数据。然后通过我们增强的鉴定生物信息学管道,该管道启动16SrRNA基因相似性搜索,然后计算平均核苷酸同一性(ANI)。对于缺乏16SrRNA序列且没有密切相关的ANI计算基因组代表的基因组序列,我们使用细菌核心基因应用不同的ANI方法来改进分类学位置(核心基因ANI,cgANI)。由于NCBI和我们新引入的cgANI方法中可用的基因组序列增加,EzBioCloud现在共有109835种,其中有21964个有效公布的名字。47896是通过16SrRNA序列相似性(系统型)或通过全基因组ANI(基因组)鉴定的候选物种,其余的39975通过cgANI(物种簇)定位在分类树中。我们的EzBioCloud数据库可以在www上访问。ezbiocould.net/db。
    With the continued evolution of DNA sequencing technologies, the role of genome sequence data has become more integral in the classification and identification of Bacteria and Archaea. Six years after introducing EzBioCloud, an integrated platform representing the taxonomic hierarchy of Bacteria and Archaea through quality-controlled 16S rRNA gene and genome sequences, we present an updated version, that further refines and expands its capabilities. The current update recognizes the growing need for accurate taxonomic information as defining a species increasingly relies on genome sequence comparisons. We also incorporated an advanced strategy for addressing underrepresented or less studied lineages, bolstering the comprehensiveness and accuracy of our database. Our rigorous quality control protocols remain, where whole-genome assemblies from the NCBI Assembly Database undergo stringent screening to remove low-quality sequence data. These are then passed through our enhanced identification bioinformatics pipeline which initiates a 16S rRNA gene similarity search and then calculates the average nucleotide identity (ANI). For genome sequences lacking a 16S rRNA sequence and without a closely related genomic representative for ANI calculation, we apply a different ANI approach using bacterial core genes for improved taxonomic placement (core gene ANI, cgANI). Because of the increase in genome sequences available in NCBI and our newly introduced cgANI method, EzBioCloud now encompasses a total of 109 835 species, of which 21 964 have validly published names. 47 896 are candidate species identified either through 16S rRNA sequence similarity (phylotypes) or through whole genome ANI (genomospecies), and the remaining 39 975 were positioned in the taxonomic tree by cgANI (species clusters). Our EzBioCloud database is accessible at www.ezbiocloud.net/db.
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  • 文章类型: Journal Article
    元素积累的效率取决于许多因素,土壤的物理化学特征似乎非常重要,分类等级在蘑菇元素积累中的作用似乎很重要。该研究的目的是比较属于Leccinum和Suillus属的7种物种的矿物质组成,在2019年至2021年之间从波兰中西部的局部地区收集。该研究旨在表明选定的土壤参数在刺激/抑制选定的Boletales蘑菇物种元素积累中的作用,并回答有关该属物种作为确定子实体特定矿物组成的指标的作用的问题。土壤pH值和其他土壤性质(粒度组成,有机碳,有机物分解的程度)可能会显着影响蘑菇的矿物质组成。属于Leccinum属的蘑菇物种比Suillus属的物种表现出更高的必需主要和微量元素含量)。这表明所研究的蘑菇物种与特定属的隶属关系可能会影响其矿物质组成,和土壤的物理化学性质可能是造成元素积累效率缺乏明确划分的原因。选定的物种含有大量的钾,Cu,Fe,Zn,而其他人,如精选的gravelleiSuillus子实体,还含有As和Cd。所描述的结果可作为更广泛的科学讨论的介绍,需要进行许多进一步的研究以确认分类学等级的作用以及土壤特性对子实体元素积累的影响。
    The efficiency of element accumulation depends on numerous factors, where the physico-chemical characteristics of the soil seem to be very important, and the role of taxonomic rank in the accumulation of elements by mushrooms seems to be important. The aim of the study was to compare the mineral composition of 7 species belonging to Leccinum and Suillus genera, collected between 2019 and 2021 from localizations in the west-central part of Poland. The research aimed to indicate the role of selected soil parameters in stimulating/inhibiting the accumulation of elements by selected Boletales mushroom species and to answer the question about the role of species belonging to the genus as an indicator determining the specific mineral composition of fruiting bodies. Soil pH and other soil properties (granulometric composition, organic carbon, degree of organic matter decomposition) may significantly affect mushrooms\' mineral composition. Mushroom species belonging to Leccinum genus exhibited the higher amount of essential major and trace elements than species of Suillus genus). It suggests that the affiliation of the studied mushroom species to a specific genus may affect their mineral composition, and the physicochemical properties of the soil may be responsible for the lack of a clear division in the efficiency of element(s) accumulation. Selected species contain high amounts of K, Cu, Fe, and Zn, while others, such as selected Suillus gravellei fruiting bodies, also contain As and Cd. The results described serve as an introduction to a broader scientific discussion and require many further studies to confirm the role of taxonomic ranks and the influence of soil characteristics on the accumulation of elements by fruiting bodies.
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  • 文章类型: Journal Article
    非结核性分枝杆菌(NTM)病在儿童中的患病率正在全球范围内增加。小儿NTM患者的临床表现与成年患者有显著差异,但是对这种疾病的知识普遍很差。
    英文数据库(PubMed,WebofScience,Embase,BIOSIS)和中文数据库(CNKI,万凡,VIP)于10月15日被搜索,2022年。考虑了使用公认的NTM物种鉴定方法报告儿童NTM疾病的物种组成和病变部位的所有横断面和队列研究文章。使用随机效应模型,我们评估了儿童NTM疾病的病变部位和不同NTM物种的患病率.使用Cochran'sQ和I2统计量分析异质性的来源。所有分析均使用CMAV3.0进行。
    不同国家儿童NTM病的患病率在0.6到5.36/100,000之间,欧洲报告的患病率最高。最常见的临床病变部位是淋巴结,占71.1%(55.0%-83.2%),其次是肺(19.3%,9.8%-34.4%),然后是皮肤和软组织(16.6%,13.5%-20.3%)。鸟分枝杆菌复合体(MAC)是儿童中最分离的NTM病原体,占54.9%(39.4%-69.6%)。与成年患者不一致,在MAC中,鸟分枝杆菌比胞内分枝杆菌占主导地位。
    淋巴结是小儿NTM病受影响最大的器官,而鸟分枝杆菌是儿童中最分离的致病物种。
    UNASSIGNED: The prevalence of nontuberculous mycobacterial (NTM) disease in children is increasing worldwide. The clinical manifestations of pediatric NTM patients are significantly different from those of adult patients, but the knowledge of the disease is generally poor.
    UNASSIGNED: English databases (PubMed, Web of Science, Embase, BIOSIS) and Chinese databases (CNKI, Wanfan, VIP) were searched on October 15th, 2022. All the articles of cross-sectional and cohort studies reporting the species composition and lesion site of the NTM disease in children using well-recognized NTM species identification methods were taken into account. Using a random effects model, we assessed the disease lesion sites and the prevalence of different NTM species in pediatric NTM disease. Sources of heterogeneity were analyzed using Cochran\'s Q and the I2 statistic. All analyses were performed using CMA V3.0.
    UNASSIGNED: The prevalence rates of NTM disease in children ranged between 0.6 and 5.36/100,000 in different countries, and Europe reported the highest prevalence rate. The most common clinical lesion site was lymph node, accounting for 71.1 % (55.0 %-83.2 %), followed by lung (19.3 %, 9.8%-34.4 %)and then skin and soft tissue (16.6 %,13.5%-20.3 %). Mycobacterium avium complex (MAC) was the most isolated NTM pathogen in children, accounting for 54.9 % (39.4%-69.6 %). Inconsistent with adult patients, Mycobacterium avium accounted for a dominant proportion in MAC than Mycobacterium intracellulare.
    UNASSIGNED: The lymph node was the most affected organ in pediatric NTM disease, while Mycobacterium avium was the most isolated pathogenic species in children.
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  • 文章类型: Journal Article
    需要进行慢性重复剂量毒性研究,以支持后期临床试验中的长期给药。提供数据来充分描述潜在关注人类安全的不利影响。慢性毒性研究的设计和持续时间有不同的监管指导,具有特定药物模式通常采用的方法的灵活性。这些指南可以提供减少时间的机会,成本,药物开发计划中的化合物要求和动物使用,如果应用更广泛,并在其当前使用范围之外考虑。本文总结了2022年11月在美国毒理学学会(ACT)第43届年会上的研讨会上的演讲,讨论了慢性毒性研究的不同方法。荷兰药品评估委员会(MEB)和英国国家替代中心之间最近的行业合作,研究中的动物的改良和减少(NC3R)说明了当前的实践和单克隆抗体(mAb)的慢性毒性研究的价值,并评估了证据重(WOE)模型,其中3个月的研究而不是6个月的研究可能是足够的。其他主题包括单物种小分子慢性毒性研究的潜在机会,肽和寡核苷酸,以及6个月的非啮齿动物研究是否可以比9个月的研究更常规地使用(类似于用于生物制品的ICHS6(R1))。还讨论了优化恢复动物使用的机会(如果有必要),以及是否可以在ICHS6(R1)内外更广泛地应用仅限制一项研究(如果有的话)。
    Chronic repeated-dose toxicity studies are required to support long-term dosing in late-stage clinical trials, providing data to adequately characterize adverse effects of potential concern for human safety. Different regulatory guidances for the design and duration of chronic toxicity studies are available, with flexibility in approaches often adopted for specific drug modalities. These guidances may provide opportunities to reduce time, cost, compound requirement and animal use within drug development programs if applied more broadly and considered outside their current scopes of use. This article summarizes presentations from a workshop at the 43rd Annual Meeting of the American College of Toxicology (ACT) in November 2022, discussing different approaches for chronic toxicity studies. A recent industry collaboration between the Netherlands Medicines Evaluation Board (MEB) and UK National Centre for the Replacement, Refinement and Reduction of Animals in Research (NC3Rs) illustrated current practices and the value of chronic toxicity studies for monoclonal antibodies (mAbs) and evaluated a weight of evidence (WOE) model where a 3-month study rather than a 6-month study might be adequate. Other topics included potential opportunities for single-species chronic toxicity studies for small molecules, peptides and oligonucleotides and whether a 6-month duration non-rodent study can be used more routinely than a 9-month study (similar to ICH S6(R1) for biological products). Also addressed were opportunities to optimize recovery animal use if warranted and whether restriction to one study only (if at all) can be applied more widely within and outside ICH S6(R1).
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  • 文章类型: Journal Article
    从天然植物中发现新的抗肿瘤药物是抗癌药物研究的主要目标。乳香,一种被广泛认可的天然抗肿瘤药物,对其物种进行了系统的审查,化学成分,和不同的药理活性和机制。乳香的不同种类包括Boswelliaserrata,索马里乳香,Boswelliafreeana,和Boswelliaarabica.各种乳香提取物和化合物表现出抗肿瘤,抗炎,和肝脏保护特性和抗氧化,增强记忆,和免疫调节能力。它们还具有调节植物区系的综合作用。乳香及其主要化学成分已证明对肿瘤具有良好的化学预防和治疗能力。这篇综述对乳香及其主要成分的抗肿瘤作用机制进行了系统的总结,从而为开发有效的抗肿瘤靶点奠定基础。
    The discovery of novel antitumor agents derived from natural plants is a principal objective of anticancer drug research. Frankincense, a widely recognized natural antitumor medicine, has undergone a systematic review encompassing its species, chemical constituents, and diverse pharmacological activities and mechanisms. The different species of frankincense include Boswellia serrata, Somali frankincense, Boswellia frereana, and Boswellia arabica. Various frankincense extracts and compounds exhibit antitumor, anti-inflammatory, and hepatoprotective properties and antioxidation, memory enhancement, and immunological regulation capabilities. They also have comprehensive effects on regulating flora. Frankincense and its principal chemical constituents have demonstrated promising chemoprophylactic and therapeutic abilities against tumors. This review provides a systematic summary of the mechanism of action underlying the antitumor effects of frankincense and its major constituents, thus laying the foundations for developing effective tumor-combating targets.
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  • 文章类型: Journal Article
    组织胞浆菌病是一种地方性真菌病,通常在免疫功能低下的患者中表现为呼吸道感染。全世界每年报告成千上万的新感染。疾病的病因,组织胞浆,是一种双态真菌,通常在它以菌丝体生长的土壤中发现。人类可以通过吸入其孢子(分生孢子)或菌丝体颗粒而被组织胞浆感染。真菌在37°C时在肺中转变为酵母相。一旦进入肺部,酵母细胞在肺泡巨噬细胞内驻留和增殖。基因组工作表明,组织胞浆由至少五个遗传上不同的隐秘系统发育物种组成。其中三个血统获得了新名称。这里,我们评估了多种表型特征(菌落形态,分泌的蛋白水解活性,酵母大小,和生长速率)来自五个组织胞浆系统发育物种的菌株,以鉴定区分这些物种的表型性状:严格的荚膜组织胞浆,Ohiense组织胞浆,Missippiense组织支原体,suramericanum,和非洲血统。我们报告了三个物种的诊断特征。另外两个物种可以通过性状的组合来鉴定。我们的结果表明(i)组织胞浆的隐匿性物种之间存在显着的表型差异,并且(ii)这些差异可用于在临床环境中积极区分这些物种,并进一步研究这种真菌病原体的进化。重要意义识别物种边界是进化生物学的重要组成部分。基因组测序和分子标记的使用促进了我们对真菌病原体进化史的理解,包括组织支原体,并允许识别新物种。这在尚未检测到形态特征的生物体中尤其重要。在这项研究中,我们修改了四个命名物种的分类地位,H.严格的囊膜(SS),H.ohiense,H.密西西比州,和H.suramericanum,并建议在无法进行基因组测序时使用物种特异性表型性状来帮助鉴定它们。这些结果不仅对组织胞浆的进化研究有意义,而且对临床医生也有意义。因为组织胞浆物种可以决定疾病的结果和所需的治疗。
    Histoplasmosis is an endemic mycosis that often presents as a respiratory infection in immunocompromised patients. Hundreds of thousands of new infections are reported annually around the world. The etiological agent of the disease, Histoplasma, is a dimorphic fungus commonly found in the soil where it grows as mycelia. Humans can become infected by Histoplasma through inhalation of its spores (conidia) or mycelial particles. The fungi transition into the yeast phase in the lungs at 37°C. Once in the lungs, yeast cells reside and proliferate inside alveolar macrophages. Genomic work has revealed that Histoplasma is composed of at least five cryptic phylogenetic species that differ genetically. Three of those lineages have received new names. Here, we evaluated multiple phenotypic characteristics (colony morphology, secreted proteolytic activity, yeast size, and growth rate) of strains from five of the phylogenetic species of Histoplasma to identify phenotypic traits that differentiate between these species: Histoplasma capsulatum sensu stricto, Histoplasma ohiense, Histoplasma mississippiense, Histoplasma suramericanum, and an African lineage. We report diagnostic traits for three species. The other two species can be identified by a combination of traits. Our results suggest that (i) there are significant phenotypic differences among the cryptic species of Histoplasma and (ii) those differences can be used to positively distinguish those species in a clinical setting and for further study of the evolution of this fungal pathogen.IMPORTANCEIdentifying species boundaries is a critical component of evolutionary biology. Genome sequencing and the use of molecular markers have advanced our understanding of the evolutionary history of fungal pathogens, including Histoplasma, and have allowed for the identification of new species. This is especially important in organisms where morphological characteristics have not been detected. In this study, we revised the taxonomic status of the four named species of the genus Histoplasma, H. capsulatum sensu stricto (ss), H. ohiense, H. mississippiense, and H. suramericanum, and propose the use of species-specific phenotypic traits to aid their identification when genome sequencing is not available. These results have implications not only for evolutionary study of Histoplasma but also for clinicians, as the Histoplasma species could determine the outcome of disease and treatment needed.
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