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Spatial modeling algorithms for reactions and transport in biological cells 生物细胞中反应和运输的空间建模算法。
IF 12 Q1 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS Pub Date : 2024-12-19 DOI: 10.1038/s43588-024-00745-x
Emmet A. Francis, Justin G. Laughlin, Jørgen S. Dokken, Henrik N. T. Finsberg, Christopher T. Lee, Marie E. Rognes, Padmini Rangamani
Biological cells rely on precise spatiotemporal coordination of biochemical reactions to control their functions. Such cell signaling networks have been a common focus for mathematical models, but they remain challenging to simulate, particularly in realistic cell geometries. Here we present Spatial Modeling Algorithms for Reactions and Transport (SMART), a software package that takes in high-level user specifications about cell signaling networks and then assembles and solves the associated mathematical systems. SMART uses state-of-the-art finite element analysis, via the FEniCS Project software, to efficiently and accurately resolve cell signaling events over discretized cellular and subcellular geometries. We demonstrate its application to several different biological systems, including yes-associated protein (YAP)/PDZ-binding motif (TAZ) mechanotransduction, calcium signaling in neurons and cardiomyocytes, and ATP generation in mitochondria. Throughout, we utilize experimentally derived realistic cellular geometries represented by well-conditioned tetrahedral meshes. These scenarios demonstrate the applicability, flexibility, accuracy and efficiency of SMART across a range of temporal and spatial scales. Spatial Modeling Algorithms for Reactions and Transport (SMART) is a software package that allows users to simulate spatially resolved biochemical signaling networks within realistic geometries of cells and organelles.
生物细胞依靠生化反应的精确时空协调来控制其功能。这种细胞信号网络一直是数学模型的研究重点,但它们的模拟仍然具有挑战性,尤其是在现实的细胞几何结构中。我们在此介绍反应和运输的空间建模算法(SMART),这是一个软件包,可接收用户关于细胞信号网络的高级规格,然后组装并求解相关的数学系统。通过 FEniCS 项目软件,SMART 利用最先进的有限元分析技术,高效、准确地解决离散化细胞和亚细胞几何结构上的细胞信号传导问题。我们展示了它在几个不同生物系统中的应用,包括 yes-associated protein (YAP)/PDZ-binding motif (TAZ) 机械传导、神经元和心肌细胞中的钙信号转导以及线粒体中的 ATP 生成。在整个过程中,我们利用实验得出的现实细胞几何图形,这些几何图形由条件良好的四面体网格表示。这些场景证明了 SMART 在一系列时间和空间尺度上的适用性、灵活性、准确性和效率。
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引用次数: 0
Predicting emergence of crystals from amorphous precursors with deep learning potentials 预测具有深度学习潜力的非晶态前体晶体的出现。
IF 12 Q1 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS Pub Date : 2024-12-18 DOI: 10.1038/s43588-024-00752-y
Muratahan Aykol, Amil Merchant, Simon Batzner, Jennifer N. Wei, Ekin Dogus Cubuk
Crystallization of amorphous precursors into metastable crystals plays a fundamental role in the formation of new matter, from geological to biological processes in nature to the synthesis and development of new materials in the laboratory. Reliably predicting the outcome of such a process would enable new research directions in these areas, but has remained beyond the reach of molecular modeling or ab initio methods. Here we show that candidates for the crystallization products of amorphous precursors can be predicted in many inorganic systems by sampling the local structural motifs at the atomistic level using universal deep learning interatomic potentials. We show that this approach identifies, with high accuracy, the most likely crystal structures of the polymorphs that initially nucleate from amorphous precursors, across a diverse set of material systems, including polymorphic oxides, nitrides, carbides, fluorides, chlorides, chalcogenides and metal alloys. This study introduces a2c, a computational method that leverages machine learning and atomistic simulations to predict the most likely crystallization products upon annealing of amorphous precursors. The a2c tool was demonstrated on a variety of materials, including oxides, nitrides and metallic glasses, and can assist researchers in discovering synthesis pathways for materials design.
从自然界的地质过程到生物过程,再到实验室新材料的合成和开发,无定形前体结晶成亚稳晶体对新物质的形成起着至关重要的作用。可靠地预测这一过程的结果将为这些领域提供新的研究方向,但仍然超出了分子建模或从头算方法的范围。在这里,我们证明了非晶前驱体的结晶产物候选物可以在许多无机系统中通过使用通用深度学习原子间势在原子水平上采样局部结构基序来预测。我们表明,这种方法可以高精度地识别出最可能的晶型结构,这些晶型结构最初是由无定形前体形成的,跨越多种材料系统,包括多晶氧化物、氮化物、碳化物、氟化物、氯化物、硫族化物和金属合金。
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引用次数: 0
An integrative data-driven model simulating C. elegans brain, body and environment interactions 模拟秀丽隐杆线虫大脑、身体和环境相互作用的综合数据驱动模型。
IF 12 Q1 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS Pub Date : 2024-12-16 DOI: 10.1038/s43588-024-00738-w
Mengdi Zhao, Ning Wang, Xinrui Jiang, Xiaoyang Ma, Haixin Ma, Gan He, Kai Du, Lei Ma, Tiejun Huang
The behavior of an organism is influenced by the complex interplay between its brain, body and environment. Existing data-driven models focus on either the brain or the body–environment. Here we present BAAIWorm, an integrative data-driven model of Caenorhabditis elegans, which consists of two submodels: the brain model and the body–environment model. The brain model was built by multicompartment models with realistic morphology, connectome and neural population dynamics based on experimental data. Simultaneously, the body–environment model used a lifelike body and a three-dimensional physical environment. Through the closed-loop interaction between the two submodels, BAAIWorm reproduced the realistic zigzag movement toward attractors observed in C. elegans. Leveraging this model, we investigated the impact of neural system structure on both neural activities and behaviors. Consequently, BAAIWorm can enhance our understanding of how the brain controls the body to interact with its surrounding environment. BAAIWorm is an integrative data-driven model of C. elegans that simulates interactions between the brain, body and environment. The biophysically detailed neuronal model is capable of replicating the zigzag movement observed in this species.
生物体的行为受到其大脑、身体和环境之间复杂的相互作用的影响。现有的数据驱动模型要么关注大脑,要么关注身体环境。在这里,我们提出了BAAIWorm,一个综合数据驱动的秀丽隐杆线虫模型,它包括两个子模型:大脑模型和身体环境模型。以实验数据为基础,采用具有真实形态学、连接体和神经种群动态的多室模型构建脑模型。同时,身体环境模型使用了逼真的身体和三维的物理环境。通过两个子模型之间的闭环相互作用,BAAIWorm复制了秀丽隐杆线虫中观察到的真实的吸引子之字形运动。利用这个模型,我们研究了神经系统结构对神经活动和行为的影响。因此,BAAIWorm可以增强我们对大脑如何控制身体与周围环境相互作用的理解。
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引用次数: 0
A simulated C. elegans with biophysically detailed neurons and muscle dynamics 模拟秀丽隐杆线虫的生物物理细节神经元和肌肉动力学。
IF 12 Q1 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS Pub Date : 2024-12-16 DOI: 10.1038/s43588-024-00740-2
We created an open-source model that simulates Caenorhabditis elegans in a closed-loop system, by integrating simulations of its brain, its physical body, and its environment. BAAIWorm replicated C. elegans locomotive behaviors, and synthetic perturbations of synaptic connections impacted neural control of movement and affected the embodied motor behavior.
我们创建了一个开源模型,通过集成对秀丽隐杆线虫大脑、身体和环境的模拟,在一个闭环系统中模拟秀丽隐杆线虫。BAAIWorm复制秀丽隐杆线虫的运动行为,突触连接的综合扰动影响神经对运动的控制,影响具身运动行为。
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引用次数: 0
Author Correction: Joint inference of discrete cell types and continuous type-specific variability in single-cell datasets with MMIDAS 作者更正:使用MMIDAS对单细胞数据集进行离散细胞类型和连续类型特异性变异性的联合推断。
IF 12 Q1 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS Pub Date : 2024-12-12 DOI: 10.1038/s43588-024-00759-5
Yeganeh Marghi, Rohan Gala, Fahimeh Baftizadeh, Uygar Sümbül
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引用次数: 0
Generative language models exhibit social identity biases 生成语言模型表现出社会身份偏见。
IF 12 Q1 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS Pub Date : 2024-12-12 DOI: 10.1038/s43588-024-00741-1
Tiancheng Hu, Yara Kyrychenko, Steve Rathje, Nigel Collier, Sander van der Linden, Jon Roozenbeek
Social identity biases, particularly the tendency to favor one’s own group (ingroup solidarity) and derogate other groups (outgroup hostility), are deeply rooted in human psychology and social behavior. However, it is unknown if such biases are also present in artificial intelligence systems. Here we show that large language models (LLMs) exhibit patterns of social identity bias, similarly to humans. By administering sentence completion prompts to 77 different LLMs (for instance, ‘We are…’), we demonstrate that nearly all base models and some instruction-tuned and preference-tuned models display clear ingroup favoritism and outgroup derogation. These biases manifest both in controlled experimental settings and in naturalistic human–LLM conversations. However, we find that careful curation of training data and specialized fine-tuning can substantially reduce bias levels. These findings have important implications for developing more equitable artificial intelligence systems and highlight the urgent need to understand how human–LLM interactions might reinforce existing social biases. Researchers show that large language models exhibit social identity biases similar to humans, having favoritism toward ingroups and hostility toward outgroups. These biases persist across models, training data and real-world human–LLM conversations.
社会身份偏见,特别是倾向于支持自己的群体(群体内团结)和贬低其他群体(群体外敌意),深深植根于人类的心理和社会行为。然而,这种偏见是否也存在于人工智能系统中尚不清楚。在这里,我们展示了大型语言模型(llm)表现出与人类相似的社会身份偏见模式。通过对77个不同的法学硕士进行句子补全提示(例如,“我们是……”),我们证明了几乎所有的基本模型和一些指令调整和偏好调整的模型都显示出明显的群体内偏爱和群体外背离。这些偏见在受控的实验环境和自然的人与法学硕士的对话中都表现出来。然而,我们发现仔细管理训练数据和专门的微调可以大大降低偏差水平。这些发现对开发更公平的人工智能系统具有重要意义,并强调迫切需要了解人类与法学硕士的互动如何强化现有的社会偏见。
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引用次数: 0
Effective quantum error correction by AI 人工智能有效的量子纠错。
IF 12 Q1 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS Pub Date : 2024-12-11 DOI: 10.1038/s43588-024-00755-9
Jie Pan
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引用次数: 0
A simulated annealing algorithm for randomizing weighted networks 随机加权网络的模拟退火算法。
IF 12 Q1 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS Pub Date : 2024-12-10 DOI: 10.1038/s43588-024-00735-z
Filip Milisav, Vincent Bazinet, Richard F. Betzel, Bratislav Misic
Scientific discovery in connectomics relies on network null models. The prominence of network features is conventionally evaluated against null distributions estimated using randomized networks. Modern imaging technologies provide an increasingly rich array of biologically meaningful edge weights. Despite the prevalence of weighted graph analysis in connectomics, randomization models that only preserve binary node degree remain most widely used. Here we propose a simulated annealing procedure for generating randomized networks that preserve weighted degree (strength) sequences. We show that the procedure outperforms other rewiring algorithms and generalizes to multiple network formats, including directed and signed networks, as well as diverse real-world networks. Throughout, we use morphospace representation to assess the sampling behavior of the algorithm and the variability of the resulting ensemble. Finally, we show that accurate strength preservation yields different inferences about brain network organization. Collectively, this work provides a simple but powerful method to analyze richly detailed next-generation connectomics datasets. This study proposes an algorithm for generating randomized networks that preserve the weighted degree sequence. The procedure outperforms standard rewiring algorithms and extends to multiple network types, including directed and signed networks.
连接组学的科学发现依赖于网络零模型。网络特征的突出性通常是根据使用随机网络估计的零分布来评估的。现代成像技术提供了越来越丰富的具有生物学意义的边缘权重。尽管加权图分析在连接组学中很流行,但仅保留二元节点度的随机化模型仍然是最广泛使用的。在这里,我们提出了一种模拟退火程序来生成保持加权度(强度)序列的随机化网络。我们表明,该过程优于其他重新布线算法,并推广到多种网络格式,包括定向和签名网络,以及各种现实世界的网络。在整个过程中,我们使用形态空间表示来评估算法的采样行为和结果集合的可变性。最后,我们证明了准确的强度保存产生了关于大脑网络组织的不同推论。总的来说,这项工作提供了一种简单但强大的方法来分析丰富详细的下一代连接组学数据集。
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引用次数: 0
A scalable framework for learning the geometry-dependent solution operators of partial differential equations 一个可扩展的框架,用于学习偏微分方程的几何相关解算子。
IF 12 Q1 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS Pub Date : 2024-12-09 DOI: 10.1038/s43588-024-00732-2
Minglang Yin, Nicolas Charon, Ryan Brody, Lu Lu, Natalia Trayanova, Mauro Maggioni
Solving partial differential equations (PDEs) using numerical methods is a ubiquitous task in engineering and medicine. However, the computational costs can be prohibitively high when many-query evaluations of PDE solutions on multiple geometries are needed. Here we aim to address this challenge by introducing Diffeomorphic Mapping Operator Learning (DIMON), a generic artificial intelligence framework that learns geometry-dependent solution operators of different types of PDE on a variety of geometries. We present several examples to demonstrate the performance, efficiency and scalability of the framework in learning both static and time-dependent PDEs on parameterized and non-parameterized domains; these include solving the Laplace equations, reaction–diffusion equations and a system of multiscale PDEs that characterize the electrical propagation on thousands of personalized heart digital twins. DIMON can reduce the computational costs of solution approximations on multiple geometries from hours to seconds with substantially less computational resources. This work presents an artificial intelligence framework to learn geometry-dependent solution operators of partial differential equations (PDEs). The framework enables scalable and fast approximations of PDE solutions on a variety of 3D geometries.
用数值方法求解偏微分方程(PDEs)是工程和医学中普遍存在的任务。然而,当需要对多个几何形状的PDE解决方案进行多查询评估时,计算成本可能会高得令人望而却步。在这里,我们的目标是通过引入差分映射算子学习(DIMON)来解决这一挑战,这是一个通用的人工智能框架,可以学习各种几何形状上不同类型PDE的几何相关解算子。我们给出了几个例子来证明该框架在参数化和非参数化域上学习静态和时间相关偏微分方程的性能、效率和可扩展性;其中包括求解拉普拉斯方程、反应扩散方程和一个多尺度偏微分方程系统,该系统表征了数千个个性化心脏数字双胞胎的电传播。DIMON可以用更少的计算资源将多个几何图形的解近似的计算成本从几小时降低到几秒钟。
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引用次数: 0
Structure-based drug design with equivariant diffusion models 基于结构的药物设计与等变扩散模型。
IF 12 Q1 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS Pub Date : 2024-12-09 DOI: 10.1038/s43588-024-00737-x
Arne Schneuing, Charles Harris, Yuanqi Du, Kieran Didi, Arian Jamasb, Ilia Igashov, Weitao Du, Carla Gomes, Tom L. Blundell, Pietro Lio, Max Welling, Michael Bronstein, Bruno Correia
Structure-based drug design (SBDD) aims to design small-molecule ligands that bind with high affinity and specificity to pre-determined protein targets. Generative SBDD methods leverage structural data of drugs with their protein targets to propose new drug candidates. However, most existing methods focus exclusively on bottom-up de novo design of compounds or tackle other drug development challenges with task-specific models. The latter requires curation of suitable datasets, careful engineering of the models and retraining from scratch for each task. Here we show how a single pretrained diffusion model can be applied to a broader range of problems, such as off-the-shelf property optimization, explicit negative design and partial molecular design with inpainting. We formulate SBDD as a three-dimensional conditional generation problem and present DiffSBDD, an SE(3)-equivariant diffusion model that generates novel ligands conditioned on protein pockets. Furthermore, we show how additional constraints can be used to improve the generated drug candidates according to a variety of computational metrics. This work applies diffusion models to conditional molecule generation and shows how they can be used to tackle various structure-based drug design problems
基于结构的药物设计(SBDD)旨在设计具有高亲和力和特异性的小分子配体与预先确定的蛋白质靶点结合。生成式SBDD方法利用药物及其蛋白质靶点的结构数据来提出新的候选药物。然而,大多数现有的方法都专注于自下而上的化合物从头设计,或者用特定任务的模型解决其他药物开发挑战。后者需要管理合适的数据集,仔细设计模型,并为每个任务从头开始重新训练。在这里,我们展示了如何将单个预训练的扩散模型应用于更广泛的问题,例如现成的性能优化,明确的负设计和部分分子设计。我们将SBDD表述为一个三维条件生成问题,并提出了DiffSBDD,这是一个SE(3)等变扩散模型,可以生成以蛋白质口袋为条件的新配体。此外,我们展示了如何根据各种计算指标使用附加约束来改进生成的候选药物。
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引用次数: 0
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Nature computational science
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