Lixia Yao, James A. Evans, Andrey Rzhetsky  Trends in Biotechnology 

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Novel opportunities for computational biology and sociology in drug discovery  Lixia Yao, James A. Evans, Andrey Rzhetsky  Trends in Biotechnology  Volume 28, Issue 4, Pages 161-170 (April 2010) DOI: 10.1016/j.tibtech.2010.01.004 Copyright © 2010 Elsevier Ltd Terms and Conditions

Figure 1 Role of computational technologies in the drug discovery process. This figure summarizes how computational biology can impact drug discovery. The various stages of the drug discovery process (See Box 1 for detailed background on each step) are listed in the left column. We note that the traditional linear process is shifting to become more parallel, simultaneous and cyclical. Red arrows indicate the traditional process and yellow dashed arrows suggest novel workflows that are increasingly adopted by pharmaceutical and biotechnological companies to increase productivity. Biomarkers and analysis of the tissue distribution of target molecules are the most recently introduced checkpoints and are not required by the FDA. Computational biology methods discussed in the main text* are listed along the top row. Blue lines illustrate how each method is related to others. For example, sequence analysis relies on pattern recognition and classification; text mining, terminologies and knowledge engineering are entwined, as are pattern recognition and classification. The impact of each computational technique on each stage of drug discovery is classified into three categories: actively or heavily used (large black dot), less actively used (small black dot) and our suggestion (small gray dot). *We do not emphasize chemical informatics in the main text because it relates to issues from chemistry and not biology. Chemical informatics comprises a wide range of approaches from computational and combinatorial chemistry that model lead properties and their interaction with targets. These include chemical structure and property prediction; structure–activity relationships; molecular similarity and diversity analysis; compound classification and selection; chemical data collection, analysis and management; virtual drug screening; and prediction of in vivo compound characteristics. PK, pharmacokinetics; PD, pharmcodynamics; ADME, absorption, distribution, metabolism and excretion. Trends in Biotechnology 2010 28, 161-170DOI: (10.1016/j.tibtech.2010.01.004) Copyright © 2010 Elsevier Ltd Terms and Conditions

Figure 2 Provisional ontology for drug discovery. The ontology features a concept for drugs or small chemical molecules and another for drug synthesis and formulation. Furthermore, a drug is known to target a specific molecule: protein, RNA, or DNA. A drug target is biologically active in the context of a pathway, cellular component, cell, and tissue. The drug is typically tested using an animal model for a specific human phenotype, usually a disease. A patient or human with the disease phenotype has a set of symptoms/signs, some of which can be unrelated to the disease. Drugs treat patients, but can cause adverse reactions. Finally, we link the patient's drug response to genetic variation in her genome and environmental factors encountered. These concepts are linked to directed or undirected relations, such as encodes (DNA encodes RNA), interacts with (drug–drug interactions), is part of (a cell is part of a tissue), affects (environmental factor affects genetic variation) and several others. We illustrate our ontology with the drug amantadine, which acts as a prophylactic agent against several RNA virus-induced influenzas that afflict the respiratory system and result in coughing and sneezing. Amantadine can cause a skin rash as a side effect. Trends in Biotechnology 2010 28, 161-170DOI: (10.1016/j.tibtech.2010.01.004) Copyright © 2010 Elsevier Ltd Terms and Conditions

Figure 3 Overview of promising computational opportunities in drug discovery. Text mining is used to extract information from publications and clinical records. Mathematical modeling helps to assess experimental data in the context of previously collected facts, whereas computational data integration distills multiple types of raw data into a collection of computable biological statements. The resulting network of semantic relations can serve as a scaffold for modeling biological processes, for design and optimization of therapeutic drug cocktails and for linking complex phenotypes to genotypes. The figure incorporates ontological concepts outlined in Figure 2: cellular process (such as tissue necrosis), symptoms (in this case, sneezing and allergic rash), genetic variation (depicted as a single nucleotide polymorphism) and drugs (amantadine, valium and aspirin) listed here from top to bottom. Trends in Biotechnology 2010 28, 161-170DOI: (10.1016/j.tibtech.2010.01.004) Copyright © 2010 Elsevier Ltd Terms and Conditions