Causal analysis in complex biological systems
First Claim
1. A software assisted method of discovering active causative relationships in the biology of complex living systems, the method comprising the steps of:
- providing a data base of biological assertions concerning a selected biological system, the data base comprising a multiplicity of nodes representative of a network of biological entities, actions, functional activities, and concepts, and relationship links between nodes indicative of there being a relationship therebetween, at least some of which include indicia of causal directionality;
simulating in the network one or more perturbations of plural individual root nodes to initiate a cascade of virtual activity through said relationship links along connected nodes to discern plural branching paths within the data base;
mapping onto the data base operational data representative of a perturbation of one or more nodes and optionally of experimentally observed or hypothesized changes in other nodes resulting from the one or more perturbations; and
prioritizing said branching paths on the basis of how well they predict said operational data, thereby to define a set of graphs comprising said branching paths potentially explanatory of the molecular biology implied by the data; and
applying logic based criteria to said set of graphs to reject graphs as not likely representative of real biology thereby to eliminate hypotheses and to identify from remaining graphs one or more active causative relationships.
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Abstract
Disclosed are software assisted systems and methods for analyzing biological data sets to generate hypotheses potentially explanatory of the data. Active causative relationships in the biology of complex living systems are discovered by providing a data base of biological assertions comprising a multiplicity of nodes representative of a network of biological entities, actions, functional activities, and concepts, and relationship links between the nodes. Simulating perturbation of individual root nodes in the network initiates a cascade of virtual activity through the relationship links to discern plural branching paths within the data base. Operational data, e.g., experimental data, representative of a real or hypothetical perturbations of one or more nodes are mapped onto the data base. The branching paths then are prioritized as hypotheses on the basis of how well they predict the operational data. Logic based criteria are applied to the graphs to reject graphs as not likely representative of real biology. The result is a set of remaining graphs comprising branching paths potentially explanatory of the molecular biology implied by the data.
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Citations
48 Claims
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1. A software assisted method of discovering active causative relationships in the biology of complex living systems, the method comprising the steps of:
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providing a data base of biological assertions concerning a selected biological system, the data base comprising a multiplicity of nodes representative of a network of biological entities, actions, functional activities, and concepts, and relationship links between nodes indicative of there being a relationship therebetween, at least some of which include indicia of causal directionality; simulating in the network one or more perturbations of plural individual root nodes to initiate a cascade of virtual activity through said relationship links along connected nodes to discern plural branching paths within the data base; mapping onto the data base operational data representative of a perturbation of one or more nodes and optionally of experimentally observed or hypothesized changes in other nodes resulting from the one or more perturbations; and prioritizing said branching paths on the basis of how well they predict said operational data, thereby to define a set of graphs comprising said branching paths potentially explanatory of the molecular biology implied by the data; and applying logic based criteria to said set of graphs to reject graphs as not likely representative of real biology thereby to eliminate hypotheses and to identify from remaining graphs one or more active causative relationships. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
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32. A software assisted method for discovering active causative relationship mechanisms in the biology of a selected biological system, the method comprising the steps of:
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providing a data base comprising a multiplicity of nodes representative of a network of biological entities, biological actions, functional biological activities, and biological concepts, and links between nodes indicative of there being a relationship therebetween; applying an algorithm to the database to identify plural graphs among linked nodes in the network potentially relevant to the functional operation of at least a portion of a selected biological system; mapping onto the data base operational data representative of perturbations of one or more nodes thereby to select a set of plural graphs for further investigation; and applying to said set of graphs filtering criteria based on assessments of how well a graph predicts said operational data to remove graphs from consideration as a viable hypotheses thereby to identify one or more remaining graphs comprising a theoretical basis of a hypothesis potentially explanatory of the biological mechanism implied by the data. - View Dependent Claims (33, 34, 35, 36, 37, 38, 39)
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40. A software assisted method for discovering active causative relationship mechanisms in the biology of a selected biological system, the method comprising the steps of:
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providing a data base comprising a multiplicity of nodes representative of a network of biological entities, biological actions, functional biological activities, and biological concepts, and links between nodes indicative of there being a relationship therebetween; mapping onto the data base operational data representative of perturbations of plural nodes; simulating a cascade of biological activity through the network from perturbation of plural individual root nodes through said links along connected nodes to discern plural graphs to plural nodes within the data base representative of plural data point of the operational data; selecting for further examination individual said discerned graphs comprising a node linked directly to plural other nodes, wherein more than one of said plural other nodes is a node represented by a data point in said operational data; and applying to individual said discerned graphs additional filtering criteria based on assessments of how well a graph predicts said operational data to remove graphs from consideration as a viable hypotheses thereby to identify one or more remaining graphs comprising a theoretical basis of a new hypothesis potentially explanatory of the biological mechanism implied by the data. - View Dependent Claims (41)
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42. A method permitting discovery by an investigator of causative relationship mechanisms in the biology of a selected biological system, the method comprising the steps of causing a second party entity or entities to:
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provide a data base comprising a multiplicity of nodes representative of a network of biological entities, biological actions, functional biological activities, and biological concepts, and links between nodes indicative of there being a relationship therebetween; apply an algorithm to the database to identify plural graphs among linked nodes in the network potentially relevant to the functional operation of at least a portion of a selected biological system; map onto the data base operational data representative of perturbations of one or more nodes thereby to select a set of plural graphs for further investigation; apply to said set of graphs filtering criteria based on assessments of how well a graph predicts said operational data to remove graphs from consideration as a viable hypotheses; and deliver a report to the investigator based on one or more remaining graphs comprising a theoretical basis of a hypothesis potentially explanatory of the biological mechanism implied by the data. - View Dependent Claims (43, 44, 45, 46, 47)
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48. An apparatus for discovering causative relationship mechanisms in the biology of a selected biological system, the apparatus comprising:
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means for applying to a data base comprising a multiplicity of nodes representative of a network of biological entities, biological actions, functional biological activities, and biological concepts, and links between nodes indicative of there being a relationship therebetween, an algorithm to identify plural graphs among linked nodes in the network potentially relevant to the functional operation of at least a portion of a selected biological system; means for receiving operational data representative of perturbations of one or more nodes; means for mapping onto the data base said operational data for selecting a set of plural graphs for further investigation; and means for applying to said set of graphs filtering criteria based on assessments of how well a graph predicts said operational data to remove graphs from consideration as a viable hypotheses, thereby to permit identification of one or more remaining graphs comprising a theoretical basis of a hypothesis potentially explanatory of the biological mechanism implied by the data.
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Specification