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Advancements in Computational Biology: A Comprehensive Guide
Computational biology is the aspect of biology that makes use of advanced computational tools to address biological issues. It provides an understanding of genes, their expression, and the genetic organization of complex traits. It performs mathematical analysis of biological data. Bioinformatics is an essential part of computational biology, using computational tools to analyze biological data. Advances in bioinformatics pave the way for small-scale experiments on living systems to be combined with software tools running on powerful computers to solve problems that can be difficult to address in the laboratory.
The traditional path for students pursuing this field had its origins in computational science and technology, typically specializing in bioinformatics. The focus was on developing new algorithms and software for the biological science community, as well as providing training and support on their use. However, due to the intrinsic interdisciplinary nature of bioinformatics and the increasingly important role that biological data processing and analysis play in today’s research, research in the areas of biotechnology and biomedicine relies heavily on both theoretical and computational methods, especially in relation to the experimental exploration of living systems at different levels.
2.1 Machine learning As an integral constituent of artificial intelligence, the discipline of machine learning (ML) is a greatly used technique that generates models from empirical data and knowledge. By using these models, the computer can address difficult tasks without the need for explicit instructions from the user. This technology encompasses many techniques like decision trees, rule-based learning, probabilistic network models, naïve Bayesian methods, nearest-neighbor and instance-based learning, support vector machines, genetic algorithms, particle swarm optimization, and artificial neural networks. The latter is inspired by the biological neural networks of animal brains. These techniques can be used in computational biology to analyze, classify, and assess patterns in biological data such as DNA sequences, RNA sequences, and protein structures. Some of the biological applications of AI technology include gene-finding, finding response elements and other signals in DNA sequences, protein classification, and protein structure prediction. Moreover, phylogenetic and evolutionary relationships of species can be probed. Many of the AI techniques are already integrated into commercial bioinformatics packages, which are available in the scientific literature.
2.2 Artificial neural networks Artificial neural networks (ANNs), also known as neural networks (NN) or connectionist systems, mirror the human neural system in which each node is similar to a biological neuron. Each synapse has a connection, which can also have a weight associated with it. When a neuron in an ANN model fires, other neurons to which it is connected receive a weighted input, which will be processed prior to the firing of these neurons too. Such a connection of all the neurons into a single model is conducted to obtain a complete NN. Mapping the interaction between the neurons is carried out in the architecture of the ANN. The ANN has characteristics of simple learning, generalization capabilities, and ease of parallelism. The single-cell organism Trichoplax adhaerens inspired the evolution of the artificial neural network. The neural network thus is an essential part of computational biology and has a number of bioinformatics applications. Due to its adaptive nature, neural networks can afford successful training on a limited dataset and are widely used to make predictions or classifications of biological data. For example, GenBlast was designed as a C. elegans gene predictor; it uses a type of ANN model that is fit to protein homology.
Identification of disease-driving variants is pivotal in bridging the information gap between the wealth of genetic and epigenetic data and other layers of -omics data, and clinical phenotypes that are of import. Identification of such variations is far from trivial and requires algorithmic support. The quality of these associations has improved, but there is still distance to cover. There are two broad categories of techniques that account for most of the variability in the methods: causal and non-causal testing, sequence alignment, and SNP selection. Novel statistical techniques are also used for expression data from long noncoding regions.
Transcriptomics has made several significant impacts across clinical medical studies, from biomarker identification through to the measurement of associations between a gene expression phenotype and (1) a clinical phenotype or a drug response, and importantly, (2) an identified gene expression phenotype. Of late, we have seen an uplift in the number of studies utilizing single-cell RNA-seq technology to, for the first time, generate reference data atlases for an individual human organ or stem cell type. This landmark work has accelerated functional genomic research and enabled the discovery of novel cell types for a range of biological systems.
The substantial growth in the quantity and variety of data generated from biology experiments is testament to an expanding demand to keep pace with unraveling biological processes. However, the associated challenge lying in functional interpretation is ignored. Over the years, data complexity has gradually evolved from low dimensional measurements to data-driven analysis of high-throughput genomic technologies, thus posing a significant challenge regarding biological interpretation and dissemination of insightful conclusions. There are several challenges that limit the generalization of biological discovery and, subsequently, the objective operationalization of complex species is hindered. Nonetheless, the current availability of big data resources, sophisticated and diverse toolboxes which can handle various data types, provides a window of opportunity to revolutionize computational biology and model a myriad of experimental designs.
In this part of the book, challenges and future directions are presented. Given that whole-genome sequencing efforts will soon cover most species of interest, it is envisioned that there is a need for a conceptual platform handling both functional elements and genetic variation concurrently. Moreover, the uniqueness of a species requires the development of species-specific computational resources, allowing the analysis to consider shared and unique gene elements. Another challenge stems from the context of recombination, diversity, and complex traits, which are crucial in the analysis of genetic elements. Public access to data, guidelines for validation of data-driven discoveries, and community-accepted guidelines are required in order to tackle network analyses from the standpoint of functional genomics, intersection between species biology, and single-cell profiling. Moreover, methodologies and standardized guidelines are required for diverse areas, such as cell-specific data analysis, gene expression order, and spatial single-cell expression analysis. The chapters are expected to provide key challenges and future directions for more complex and comprehensive computational biology observations.
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