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Unveiling the pathogenicity of allosteric protein mutations via multifaceted feature ensembling 通过多面特征集合揭示变构蛋白突变的致病性。
IF 4.3 3区 生物学 Q1 BIOCHEMICAL RESEARCH METHODS Pub Date : 2025-09-08 DOI: 10.1016/j.ymeth.2025.07.014
Huiling Zhang , Xijian Li , Junwen Huang , Yuetong Li , Shaozhen Cai , Haiyan Wang , Yanjie Wei
Allostery proteins play a central role in biological processes and systems. Uncovering the biological effects of allosteric protein mutations and their role in disease progression remains a significant challenge. Theoretically, computational approaches hold the potential to enable large-scale interpretation of genetic variants in allosteric proteins. Nevertheless, general-purpose variant effect prediction (VEP) methodologies overlook the characteristic disparities across different genes. What is more critical is that individual tools frequently display inconsistencies, biases, and fluctuations in quality. Consequently, the predictions obtained from existing VEP approaches are considered insufficiently reliable. In the present research, we constructed an a multifaceted-feature-based ensemble learning approach to forecast the pathogenicity of missense mutations within allosteric proteins. The proposed method used categorical boosting to integrate four types of features, namely, sequence information, AlphaFold2-extracted biochemical properties, prediction scores from other VEP methods, and allele frequency from gnomAD. Our method demonstrated superior performance with an AUC of 0.912 when tested on a benchmark allosteric protein dataset, outperforming 22 general VEP methods. To facilitate the identification of pathogenic mutations in the sea of rare variants discovered as sequencing studies expand on a large scale, we provided the pathogenicity probabilities of all potential amino acid substitutions in 202 allosteric-protein-encoding genes. To sum up, our research indicates that multifaceted-feature-based ensemble learning models can offer valuable independent evidence for interpreting missense mutations in allosteric proteins, which will be broadly applicable in both research and clinical contexts.
变构蛋白在生物过程和系统中起着核心作用。确定突变对变构蛋白的生物学影响及其在疾病发生和进展期间影响的表型是一项重大挑战。理论上,计算方法有可能促进大规模解释变构蛋白的遗传变异。然而,一般的变异效应预测(VEP)方法忽略了不同基因之间的特征差异。更重要的是,单个工具在质量上经常表现出分歧、偏差和变化。因此,从当前VEP方法得出的预测被认为不够可靠。在这项研究中,我们开发了一种预测变构蛋白错义突变致病性的综合方法。该方法采用分类增强方法,将序列信息、alphafold2提取的生化特性、其他VEP方法的预测分数和gnomAD的等位基因频率四类特征进行整合。在一个基准变构蛋白数据集上,该方法的AUC为0.912,优于22种通用的VEP方法。随着测序研究的大规模扩展,为了便于在发现的罕见变异海洋中识别致病突变,我们提供了202个变构蛋白编码基因中所有潜在氨基酸替换的致病概率。总之,我们的工作表明,来自集成学习的模型可以为解释变构蛋白的错义突变提供有价值的独立证据,这将在研究和临床场景中广泛使用。
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引用次数: 0
Deciphering cellular heterogeneity: Breakthroughs and prospects of single-cell-level SERS analysis in precision medicine 解读细胞异质性:精准医学中单细胞水平SERS分析的突破与展望
IF 4.3 3区 生物学 Q1 BIOCHEMICAL RESEARCH METHODS Pub Date : 2025-09-07 DOI: 10.1016/j.ymeth.2025.09.002
Biqing Chen, Jiayin Gao, Haizhu Sun, Yan Liu, Yinghan Zhao, Xiaohong Qiu
Single-cell surface-enhanced Raman scattering (SERS) has emerged as a powerful tool for precision medicine owing to its label-free detection, ultrasensitivity, and unique molecular fingerprinting. Unlike conventional bulk analysis, it enables detailed characterization of cellular heterogeneity, with particular promise in circulating tumor cell (CTC) identification, tumor microenvironment (TME) metabolic profiling, subcellular imaging, and drug sensitivity assessment. Coupled with microfluidic droplet systems, SERS supports high-throughput single-cell analysis and multiparametric screening, while integration with complementary modalities such as fluorescence microscopy and mass spectrometry enhances temporal and spatial resolution for monitoring live cells. Despite hurdles in nanoprobe safety, complex spectral interpretation, and clinical translation, advances in AI-driven data processing (e.g., convolutional neural networks) and miniaturized devices are accelerating progress toward intraoperative guidance, improved liquid biopsy, and primary healthcare adoption. Looking ahead, its applications in single-cell metabolomics, exosome studies, and microbial detection hold promise for uncovering disease mechanisms and fostering personalized diagnostics and therapeutics.
单细胞表面增强拉曼散射(SERS)由于其无标记检测、超灵敏度和独特的分子指纹特征而成为精准医学的有力工具。与传统的批量分析不同,它能够详细表征细胞异质性,在循环肿瘤细胞(CTC)鉴定、肿瘤微环境(TME)代谢谱、亚细胞成像和药物敏感性评估方面尤其有前景。与微流控液滴系统相结合,SERS支持高通量单细胞分析和多参数筛选,同时与荧光显微镜和质谱等互补模式相结合,增强了监测活细胞的时间和空间分辨率。尽管在纳米探针安全性、复杂光谱解释和临床翻译方面存在障碍,但人工智能驱动的数据处理(如卷积神经网络)和小型化设备的进步正在加速术中指导、改进液体活检和初级卫生保健采用方面的进展。展望未来,它在单细胞代谢组学、外泌体研究和微生物检测方面的应用有望揭示疾病机制,促进个性化诊断和治疗。
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引用次数: 0
Strain promoted click labeling of oligonucleotides on solid-phase support 应变促进在固相载体上的寡核苷酸点击标记。
IF 4.3 3区 生物学 Q1 BIOCHEMICAL RESEARCH METHODS Pub Date : 2025-09-06 DOI: 10.1016/j.ymeth.2025.09.001
Michaela Beranova , Petra Grossova , Jiri Demuth , Filip Kostelansky , Veronika Novakova , Petr Zimcik , Miroslav Miletin
Chemically modified oligonucleotides (ONs) are essential tools in molecular biology, diagnostics, and therapeutics. Strain-promoted azide–alkyne cycloaddition (SPAAC) offers an efficient and bioorthogonal method for ON functionalization. While SPAAC reactions on solid-phase support provide distinct advantages, particularly for the incorporation of lipophilic labels, factors influencing their efficiency remain poorly characterized. The interplay between the physicochemical properties of the modifying molecule, the nature of the solid support, and the labeling site within the ON chain has not been systematically evaluated. In this study, we systematically investigate how modifying molecule properties (size, polarity) and concentration, solid support type, labeling site within the ON chain, and reaction time influence efficiency of labeling. Our findings demonstrate that while polar modifying molecules react efficiently across all solid supports, lipophilic molecules can exhibit reduced reactivity on glass-based supports, particularly in positions close to the 3́-end of the oligonucleotide attached to the support. We further show that conjugation at the 5′-terminus consistently yields the highest efficiencies, with a gradual decline observed as the modification site approaches the 3′-end. A 1 mM concentration of labeling reagent was sufficient to achieve high yields on polystyrene support for all labels and on CPG 500 for the polar labels. The size of the modifying molecule had a lesser effect compared to other factors. The method also benefits from recovery and reusability of the unreacted label. These results enable the rational design of efficient ON labeling protocols on solid-phase support while minimizing reagent consumption, contributing to both cost-effectiveness and environmental sustainability.
化学修饰的寡核苷酸(ONs)是分子生物学、诊断和治疗学中必不可少的工具。菌株促进叠氮化物-炔环加成(SPAAC)是一种高效的生物正交ON官能化方法。虽然固相载体上的SPAAC反应具有明显的优势,特别是对于亲脂性标签的掺入,但影响其效率的因素仍然缺乏表征。修饰分子的物理化学性质、固体载体的性质和ON链内的标记位点之间的相互作用尚未得到系统的评估。在本研究中,我们系统地研究了修饰分子性质(大小、极性)和浓度、固体载体类型、ON链内标记位点和反应时间对标记效率的影响。我们的研究结果表明,虽然极性修饰分子在所有固体载体上都能有效地反应,但亲脂分子在玻璃基载体上的反应性会降低,特别是在靠近载体上的寡核苷酸3端的位置。我们进一步表明,在5‘端偶联始终产生最高的效率,随着修饰位点接近3’端,观察到逐渐下降。1 mM浓度的标记试剂足以在聚苯乙烯载体上获得所有标签的高收率,在CPG 500上获得极性标签。与其他因素相比,修饰分子的大小影响较小。该方法还受益于未反应标签的回收和可重用性。这些结果使得在固相载体上合理设计高效的ON标记协议,同时最大限度地减少试剂消耗,有助于成本效益和环境可持续性。
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引用次数: 0
AI-augmented prediction of high-risk PINK1 variants associated with Parkinson’s disease: integrating multilayered bioinformatics, MD simulation, and deep learning 人工智能增强预测与帕金森病相关的高危PINK1变异:整合多层生物信息学、MD模拟和深度学习
IF 4.3 3区 生物学 Q1 BIOCHEMICAL RESEARCH METHODS Pub Date : 2025-09-04 DOI: 10.1016/j.ymeth.2025.08.014
Hafeez Ur Rehman , Dawood Ahmad Warraich , Abdur Rehman , Israr Fatima , Yuxuan Meng , Mohamed Aldaw , Yanheng Ding , Ruiqi Zhang , Yu Ni , Zhijie He , Hao Zhang , Zhibo Wang , Lijun Feng , Yingcui Yu , Mingzhi Liao
Parkinson’s disease is a prevalent neurodegenerative disease, in which genetic mutations in many genes play an important role in its pathogenesis. Among these, a mutation in the PINK1 gene, a mitochondrial-targeted serine/threonine putative kinase 1 that protects cells from stress-induced mitochondrial dysfunction, is implicated in autosomal recessive Parkinsonism. However, the exact etiology is not well understood. Therefore, this study aimed to identify the most damaging non-synonymous single-nucleotide polymorphisms (nsSNPs) distributed in the kinase domain of the PINK1 gene and their structural and functional alterations using a range of bioinformatics and deep learning tools. Next, to find the possible impact of these mutations on PINK1 interactions and binding affinities, a protein–protein interaction and molecular docking analysis were conducted. Finally, molecular dynamics (MD) simulations were performed to observe the stability and dynamic behaviour of the pathogenic SNPs on the PINK1 protein over time. Our integrated bioinformatics and deep learning approaches predicted 5 SNPs (C166R, E240K, D362N, D362Y, and C388R) as high-risk candidates for disrupting PINK1 structure and function. In conclusion, we propose that the pathogenicity of these variants may provide an important clue to understanding the mechanism by which pathogenic nsSNPs contribute to PD, thereby enhancing future diagnostic value for the disease and serving as potential targets for new drugs.
帕金森病是一种常见的神经退行性疾病,许多基因的基因突变在其发病机制中起着重要作用。其中,PINK1基因(一种线粒体靶向丝氨酸/苏氨酸激酶1,可保护细胞免受应激诱导的线粒体功能障碍)的突变与常染色体隐性遗传性帕金森病有关。然而,确切的病因尚不清楚。因此,本研究旨在利用一系列生物信息学和深度学习工具,确定分布在PINK1基因激酶结构域的最具破坏性的非同义单核苷酸多态性(nssnp)及其结构和功能改变。接下来,为了发现这些突变对PINK1相互作用和结合亲和力可能产生的影响,我们进行了蛋白-蛋白相互作用和分子对接分析。最后,进行分子动力学(MD)模拟,观察致病snp在PINK1蛋白上随时间的稳定性和动态行为。我们的综合生物信息学和深度学习方法预测了5个snp (C166R, E240K, D362N, D362Y和C388R)作为破坏PINK1结构和功能的高风险候选。总之,我们认为这些变异的致病性可能为理解致病性nssnp参与PD的机制提供了重要线索,从而提高了未来对PD的诊断价值,并作为新药的潜在靶点。
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引用次数: 0
Capturing G protein-coupled receptors into native lipid-bilayer nanodiscs using new diisobutylene/maleic acid (DIBMA) copolymers 利用新型二异丁烯/马来酸(DIBMA)共聚物将G蛋白偶联受体捕获到天然脂质双层纳米圆盘中。
IF 4.3 3区 生物学 Q1 BIOCHEMICAL RESEARCH METHODS Pub Date : 2025-09-04 DOI: 10.1016/j.ymeth.2025.08.013
Ci Chu , Carolyn Vargas , Maria Carolina Barbosa , Simon Sommerhage , Gerald N. Rechberger , David Pahovnik , Ema Žagar , Gunnar F. Schröder , Sandro Keller , Manuel Etzkorn
Many membrane proteins, including G protein-coupled receptors (GPCRs), are susceptible to denaturation when extracted from their native membrane by detergents. Therefore, alternative methods have been developed, including amphiphilic copolymers that enable the direct extraction of functional membrane proteins along with their surrounding lipids. Among these amphiphilic copolymers, styrene/maleic acid (SMA) and diisobutylene/maleic acid (DIBMA) polymers have been extensively studied. Despite their many benefits, SMA and DIBMA polymers also have considerable drawbacks limiting their applications. Herein, we describe a series of new amphiphilic copolymers derived from DIBMA via partial amidation of the carboxylate pendant groups with various biocompatible amines. We characterize the new polymer’s nanodisc-forming properties and ability to extract the melanocortin 4 receptor (MC4R), a prototypical class A GPCR. While each new DIBMA variant displays features that may be favorable for selected applications, we identified a PEGylated DIBMA variant called mPEG4-DIBMA as particularly promising. In the tested system mPEG4-DIBMA abolishes unspecific interactions and outperforms other polymers by achieving higher extraction efficiencies of MC4R from Sf9 insect cell membranes. The new nanodisc-forming polymer combines two key advantages that are crucial for investigating GPCRs in a well-defined but still native lipid-bilayer environment, thus paving the way for manifold future applications.
许多膜蛋白,包括G蛋白偶联受体(gpcr),当被洗涤剂从其天然膜中提取时,容易变性。因此,替代方法已经开发出来,包括两亲性共聚物,可以直接提取功能膜蛋白及其周围的脂质。在这些两亲共聚物中,苯乙烯/马来酸(SMA)和二异丁烯/马来酸(DIBMA)聚合物得到了广泛的研究。尽管SMA和DIBMA聚合物有许多优点,但它们也有相当大的缺点,限制了它们的应用。在此,我们描述了一系列新的两亲性共聚物,这些共聚物是通过羧酸悬垂基团与各种生物相容性胺的部分酰胺化而得到的。我们表征了新聚合物的纳米圆盘形成特性和提取黑素皮质素4受体(MC4R)的能力,这是一种典型的a类GPCR。虽然每个新的DIBMA变体都显示出可能有利于选定应用的特征,但我们确定了一个称为mPEG4-DIBMA的聚乙二醇化DIBMA变体特别有前途。在测试的体系中,mPEG4-DIBMA消除了非特异性相互作用,并通过从Sf9昆虫细胞膜中获得更高的MC4R提取效率而优于其他聚合物。这种新型纳米盘状聚合物结合了两个关键优势,这对于在定义明确但仍然是天然脂质双分子层环境中研究gpcr至关重要,从而为未来的多种应用铺平了道路。
{"title":"Capturing G protein-coupled receptors into native lipid-bilayer nanodiscs using new diisobutylene/maleic acid (DIBMA) copolymers","authors":"Ci Chu ,&nbsp;Carolyn Vargas ,&nbsp;Maria Carolina Barbosa ,&nbsp;Simon Sommerhage ,&nbsp;Gerald N. Rechberger ,&nbsp;David Pahovnik ,&nbsp;Ema Žagar ,&nbsp;Gunnar F. Schröder ,&nbsp;Sandro Keller ,&nbsp;Manuel Etzkorn","doi":"10.1016/j.ymeth.2025.08.013","DOIUrl":"10.1016/j.ymeth.2025.08.013","url":null,"abstract":"<div><div>Many membrane proteins, including G protein-coupled receptors (GPCRs), are susceptible to denaturation when extracted from their native membrane by detergents. Therefore, alternative methods have been developed, including amphiphilic copolymers that enable the direct extraction of functional membrane proteins along with their surrounding lipids. Among these amphiphilic copolymers, styrene/maleic acid (SMA) and diisobutylene/maleic acid (DIBMA) polymers have been extensively studied. Despite their many benefits, SMA and DIBMA polymers also have considerable drawbacks limiting their applications. Herein, we describe a series of new amphiphilic copolymers derived from DIBMA via partial amidation of the carboxylate pendant groups with various biocompatible amines. We characterize the new polymer’s nanodisc-forming properties and ability to extract the melanocortin 4 receptor (MC<sub>4</sub>R), a prototypical class A GPCR. While each new DIBMA variant displays features that may be favorable for selected applications, we identified a PEGylated DIBMA variant called mPEG<sub>4</sub>-DIBMA as particularly promising. In the tested system mPEG<sub>4</sub>-DIBMA abolishes unspecific interactions and outperforms other polymers by achieving higher extraction efficiencies of MC<sub>4</sub>R from Sf9 insect cell membranes. The new nanodisc-forming polymer combines two key advantages that are crucial for investigating GPCRs in a well-defined but still native lipid-bilayer environment, thus paving the way for manifold future applications.</div></div>","PeriodicalId":390,"journal":{"name":"Methods","volume":"244 ","pages":"Pages 55-64"},"PeriodicalIF":4.3,"publicationDate":"2025-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145008085","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Efficient RNA nucleotide encoding enhances the accurate prediction of ac4C modifications 高效的RNA核苷酸编码增强了对ac4C修饰的准确预测。
IF 4.3 3区 生物学 Q1 BIOCHEMICAL RESEARCH METHODS Pub Date : 2025-08-31 DOI: 10.1016/j.ymeth.2025.07.012
Na Li , Xiao Wang , Ming Zeng , Feng Cao , Ke Qiu , Jianbo Qiao
RNA N4-acetylcytidine (ac4C) modification plays a vital role in gene regulation and cellular function. Accurate identification of ac4C sites is essential for elucidating their biological significance. However, existing prediction methods struggle to capture complex sequence patterns, limiting their accuracy. To address this, we propose GO-ac4C, an efficient prediction framework that integrates byte-pair encoding with nucleotide compositional features. GO-ac4C employs dynamic byte-pair encoding to learn optimal subsequence representations and enhances them with compositional features to effectively capture key motifs in RNA sequences. Experimental results demonstrate that GO-ac4C significantly outperforms state-of-the-art methods across multiple evaluation metrics and offers new insights into the mechanisms of RNA modification.
RNA n4 -乙酰胞苷(ac4C)修饰在基因调控和细胞功能中起着至关重要的作用。准确鉴定ac4C位点对于阐明其生物学意义至关重要。然而,现有的预测方法难以捕捉复杂的序列模式,限制了它们的准确性。为了解决这个问题,我们提出了GO-ac4C,一个有效的预测框架,集成了字节对编码和核苷酸组成特征。GO-ac4C采用动态字节对编码来学习最优子序列表示,并用组合特征对其进行增强,从而有效捕获RNA序列中的关键基序。实验结果表明,GO-ac4C在多个评估指标上明显优于最先进的方法,并为RNA修饰机制提供了新的见解。
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引用次数: 0
Rapid in vitro and computer-aided method for assessing synergistic interactions between NSAIDs and analgesics 快速体外和计算机辅助方法评估非甾体抗炎药和镇痛药之间的协同相互作用。
IF 4.3 3区 生物学 Q1 BIOCHEMICAL RESEARCH METHODS Pub Date : 2025-08-30 DOI: 10.1016/j.ymeth.2025.08.012
Fernando Silva , Gustavo Costa , Francisco Veiga , Vera Moura , Francisca Dias , Fátima Cerqueira , Rui Medeiros , Ana Cláudia Paiva-Santos
Pain is a complex phenomenon that plays a significant role in various diseases, influencing both the physical and psychological well-being of individuals. In clinical practice, combining nonsteroidal anti-inflammatory drugs (NSAIDs) with analgesics, such as paracetamol or metamizole, has become a widely adopted strategy to manage pain. Although the synergistic effects of combining NSAIDs with analgesics are well recognized in clinical practice, this approach is primarily based on empirical clinical experience. Our work aims to present a rapid method for evaluating the anti-inflammatory effects of drug combinations through in vitro assays combined with computer-aided data processing and analysis.
We conducted two simple and rapid in vitro assays, the Griess and DPPH assays, to evaluate the effects of NSAID–analgesic combinations and demonstrate their synergistic interactions, using the free web application SynergyFinder Plus. This computer-aided analysis enabled a quantitative assessment of drug interactions, enhancing the interpretation of the experimental data. Furthermore, to better understand the results obtained from previous experiments, we analysed the anti-inflammatory effects of ketoprofen and dexketoprofen in combination with metamizole and paracetamol through quantitative real-time PCR (qRT-PCR). Our findings reveal synergistic interactions between NSAIDs and analgesics in terms of their anti-inflammatory and antioxidant activities.
This work could be the first step for the study of the mechanisms behind the synergistic interactions between NSAIDs and analgesics for the treatment of pain, mainly when inflammatory processes are involved. Consequently, this study aims to contribute to the exploration of non-opioid drug combinations, addressing the urgent need for alternative analgesic strategies that minimize opioid use.
疼痛是一种复杂的现象,在各种疾病中起着重要作用,影响着个体的生理和心理健康。在临床实践中,非甾体抗炎药(NSAIDs)与镇痛药(如扑热息痛或metamizole)联合使用已成为一种广泛采用的治疗疼痛的策略。尽管非甾体抗炎药与镇痛药联合使用的协同作用在临床实践中得到了广泛认可,但这种方法主要基于临床经验。我们的工作旨在通过体外试验结合计算机辅助数据处理和分析,提出一种快速评估药物联合抗炎作用的方法。我们使用免费的网络应用程序SynergyFinder Plus进行了两种简单快速的体外试验,Griess和DPPH试验,以评估nsaid -镇痛药联合使用的效果,并证明它们之间的协同作用。这种计算机辅助分析能够对药物相互作用进行定量评估,增强对实验数据的解释。此外,为了更好地理解之前的实验结果,我们通过实时荧光定量PCR (qRT-PCR)分析了酮洛芬和右酮洛芬与metamizole和paracetamol联合使用的抗炎作用。我们的发现揭示了非甾体抗炎药和镇痛药在抗炎和抗氧化活性方面的协同相互作用。这项工作可能是研究非甾体抗炎药和镇痛药治疗疼痛的协同相互作用机制的第一步,主要是在炎症过程中。因此,本研究旨在促进非阿片类药物组合的探索,解决替代镇痛策略的迫切需要,最大限度地减少阿片类药物的使用。
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引用次数: 0
Validation of combo ichroma as a reliable concentration-based alternative for AST and ALT measurement in liver disease monitoring 联合色度作为肝脏疾病监测中AST和ALT测量的可靠的基于浓度的替代方法的验证
IF 4.3 3区 生物学 Q1 BIOCHEMICAL RESEARCH METHODS Pub Date : 2025-08-27 DOI: 10.1016/j.ymeth.2025.08.011
Minsoo Kim , Su A Kim , Jeong Min Kim , Hee Young Kim , Ho Yeong Yoon , Sung Won Park , Daegyun Park , Ji Sook Han , Ki Tae Suk

Background

Traditional assays for aspartate aminotransferase (AST) and alanine aminotransferase (ALT) measure enzymatic activity, which degrades during long-term frozen storage, threatening the accuracy of the assay. Instead, Combo ichroma (CI), a fluorescence immunoassay that quantifies AST and ALT concentrations, is a robust alternative for retrospective and point-of-care liver function testing, free from the influence of long-term storage.

Methods

Serum samples from 256 individuals (controls and patients with hepatitis, cirrhosis, or liver cancer) were collected and stored at −80 °C for an average of three years. AST and ALT were measured using CI, the 7180 clinical analyzer (HT), and Atellica CH 930 analyzer performed immediately after collection (HL). Correlations between AST, ALT, and AST/ALT ratios were analyzed. Random Forest Regression (RFR) models using CI or HT data were developed to predict HL-derived AST/ALT ratios.

Results

CI-AST showed strong correlation with HL-AST across all groups (R2 > 0.95), outperforming HT-AST, especially in controls (R2 = 0.58). CI-ALT moderately correlated with HL-ALT (R2 = 0.87), surpassing HT-ALT (R2 = 0.71). AST/ALT ratios varied across methods due to ALT variability, but RFR using CI data accurately predicted HL ratios (R2 = 0.85–0.91). Subgroup analysis confirmed CI’s superior concordance across etiologies.

Conclusions

CI enables activity-independent, reliable measurement of AST and ALT even after extended storage, outperforming enzymatic assays in precision and correlation. Its simplicity, and compatibility with machine learning models position CI as a promising tool for liver enzyme diagnostics in both clinical and resource-limited settings.
传统的天冬氨酸转氨酶(AST)和丙氨酸转氨酶(ALT)检测方法测量的是酶活性,在长期冷冻储存过程中酶活性会降低,从而影响检测的准确性。相反,组合染色法(CI)是一种定量AST和ALT浓度的荧光免疫分析法,是回顾性和即时肝功能检测的可靠替代方法,不受长期储存的影响。方法收集256例(对照组和肝炎、肝硬化或肝癌患者)的血清样本,在- 80℃平均保存3年。采用CI、7180临床分析仪(HT)和Atellica CH 930采集后立即测定AST和ALT。分析AST、ALT及AST/ALT比值的相关性。随机森林回归(RFR)模型使用CI或HT数据来预测hl衍生的AST/ALT比率。结果sci - ast与HL-AST在各组间均表现出较强的相关性(R2 > 0.95),优于HT-AST (R2 = 0.58)。CI-ALT与HL-ALT中度相关(R2 = 0.87),优于HT-ALT (R2 = 0.71)。由于ALT的可变性,不同方法的AST/ALT比率不同,但使用CI数据的RFR准确预测HL比率(R2 = 0.85-0.91)。亚组分析证实了CI在病因上的优越一致性。结论sci能够独立于活性,可靠地测量AST和ALT,即使在延长储存后,在精度和相关性方面优于酶分析。它的简单性和与机器学习模型的兼容性使CI在临床和资源有限的情况下都成为肝酶诊断的有前途的工具。
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引用次数: 0
Optimized CUT&Tag enables robust epigenome profiling in Schizosaccharomyces pombe 优化的CUT&Tag能够在裂糖菌pombe中实现稳健的表观基因组分析
IF 4.3 3区 生物学 Q1 BIOCHEMICAL RESEARCH METHODS Pub Date : 2025-08-22 DOI: 10.1016/j.ymeth.2025.08.010
Cheng-Zhi Huang , Kang-Di Zhou , Wei Ma
We optimized permeabilization for CUT&Tag in S. pombe, enabling robust H3K9me3 profiling using lightly fixed permeabilized sepheroplasts, overcoming limitations of ChIP-seq including crosslinking artifacts and high cell input. We established an optimized Cleavage Under Targets and Tagmentation (CUT&Tag) protocol for high-resolution epigenome profiling in Schizosaccharomyces pombe using Critical permeabilization refinements identified Lywallzyme as the optimal enzyme for spheroplast generation (>95 % efficiency in 60 min at 10 mg/mL), outperforming Zymolyase-20 T and combinatorial treatments. Systematic parameter optimization revealed concentration-dependent digestion kinetics and an inverse cell load-efficiency relationship (5 × 105 cells achieving > 90 % conversion in 50 min at 5 mg/mL). Validated through H3K9me3 mapping in wild-type and clr strains (10⁶ cells/replicate), this approach captured specific heterochromatic enrichment at centromeres/telomeres with complete signal ablation in mutants, while reduced spike-in DNA (0.2 pg) significantly enhanced signal-to-noise ratios. The protocol enables robust epigenomic analysis with minimal cell input and enhanced resolution.
我们优化了S. pombe中CUT&;Tag的渗透性,使用轻度固定的渗透性磷脂质体实现稳健的H3K9me3分析,克服了ChIP-seq的局限性,包括交联伪影和高细胞输入。我们建立了一个优化的切割靶下和标记(CUT&Tag)方案,用于高分辨率的裂糖酵母表观基因组分析,使用临界渗透细化鉴定出Lywallzyme是球质体生成的最佳酶(在10 mg/mL条件下60分钟效率为95%),优于酶解酶- 20t和组合处理。系统参数优化揭示了浓度依赖的消化动力学和反向的细胞负载效率关系(5 × 105个细胞在5 mg/mL的条件下在50分钟内达到90%的转化率)。通过在野生型和clr4Δ菌株(10 26个细胞/重复)中进行H3K9me3定位验证,该方法在突变体中捕获了着丝粒/端粒的特异性异染色质富集,信号完全消失,同时减少了DNA尖峰(0.2 pg),显著提高了信噪比。该方案能够以最小的细胞输入和增强的分辨率进行稳健的表观基因组分析。
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引用次数: 0
Volumetric dried blood spot microsampling: A sustainable, patient-friendly, and practical approach for retinol and α-tocopherol analysis in a clinical setting 体积干燥血斑微采样:一个可持续的,病人友好的,实用的方法视黄醇和α-生育酚分析在临床设置
IF 4.3 3区 生物学 Q1 BIOCHEMICAL RESEARCH METHODS Pub Date : 2025-08-22 DOI: 10.1016/j.ymeth.2025.08.006
Chaweewan Suwanvecho , Lenka Kujovská Krčmová , František Švec
Dried blood spot (DBS) technique has gained significant attention due to the growth of decentralized diagnostics. This technique reduces the number of hospital visits for patients and the workload for personnel in specialized hospitals. This microsampling method provides an environmentally friendly (green) and patient-friendly alternative to conventional phlebotomy. Challenges related to sample heterogeneity in traditional DBS cards have been overcome by the volumetric DBS sampling using new types of commercially available devices. Due to the unstable nature of the analytes, commercial volumetric DBS devices allow blood sampling at primary care units in remote settings and facilitate transport it via temperature-controlled systems. Blood sample stability has improved from 24 h at 4–8 °C to 30 days at −80°C. DBS also requires over 1000 times less shipping and storage space than liquid blood. We optimized the DBS method to require only 10 µL of blood and achieve extraction efficiencies of over 90 % for retinol when the result from validated method is the reference value. However, α-tocopherol recovery varied from 53 to 75 % depending on the filter paper type used. Furthermore, we successfully developed a liquid–liquid extraction method for both analytes from whole blood, with over 90 % recovery. Our approaches eliminate the need for separate serum and erythrocyte extractions, simplify sample preparation, and reduce reagent use and energy consumption. Both devices enable reliable volumetric collection. Our approach makes micronutrient monitoring more accessible and enables sample collection in decentralized settings. This aligns with the objectives of green analytical chemistry and universal health coverage.
由于分散式诊断的发展,干血斑(DBS)技术得到了极大的关注。这种技术减少了患者的医院就诊次数和专科医院工作人员的工作量。这种微采样方法提供了一种环境友好(绿色)和病人友好的替代传统的静脉切开术。传统DBS卡中与样本异质性相关的挑战已经被使用新型商用设备的容量DBS采样所克服。由于分析物的不稳定性,商用容量DBS设备允许在偏远地区的初级保健单位进行血液采样,并便于通过温控系统运输。血液样品的稳定性从4-8°C下的24小时提高到- 80°C下的30天。DBS所需的运输和储存空间也比液体血液少1000多倍。我们优化了DBS方法,只需要10µL的血液,当验证方法的结果为参考值时,视黄醇的提取效率超过90%。然而,α-生育酚的回收率根据滤纸类型的不同,从53%到75%不等。此外,我们成功地开发了一种液-液萃取方法,可从全血中提取这两种分析物,回收率超过90%。我们的方法消除了分离血清和红细胞提取的需要,简化了样品制备,减少了试剂的使用和能源消耗。这两种设备都支持可靠的体积收集。我们的方法使微量营养素监测更容易获得,并能够在分散的环境中收集样本。这符合绿色分析化学和全民健康覆盖的目标。
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