Forthcoming articles

 


International Journal of Computational Intelligence in Bioinformatics and Systems Biology

 

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International Journal of Computational Intelligence in Bioinformatics and Systems Biology (3 papers in press)

 

Regular Issues

 

  • Discovering of Gapped Motifs using Particle Swarm Optimization   Order a copy of this article
    by Srinivasulu Reddy Uyyala, Michael Arock, A. V. Reddy 
    Abstract: In Bioinformatics, Motif discovery is one of the fundamental and important computational problems. It often corresponds to functionally and structurally important elements in DNA sequences and proteins. Motif (pattern, signal or domain) is a feature that occurs repeatedly in biological sequences, typically more often than expected, at random. Identifying these recurring patterns in biological sequences helps us to better understand the mechanisms that regulate gene expression. In the last decade, many computational methods have been proven useful in predicting real binding sites. No single method stands out as the sole best. Many methods are used to discover gapless motifs by ignoring gaps. Algorithms: RSAT, BioProspector, BIPAD, SPACER, SCOPE, MERMAID and GALAM2 were especially designed for discovering gapped motifs. Recently several evolutionary algorithms have been developed to solve motif discovery problem, because of their efficiency in searching multidimensional solution space. HPSO, IPSO-GA, PMbPSO and PSO+ are based on Particle Swarm Optimization (PSO) algorithms. Among these methods, PSO+ is the first one to be proposed for finding Gapped Motifs. PSO+ is less efficient in finding Gapped Motifs that are located at the center of a motif. Here, our contribution is, to find Gapped Motifs that are present at the center of two conserved regions efficiently by adopting features of PSO to solve the problem. We performed experiments first on simulated planted (l, d)-motifs and then modeled these to identify gapped motifs. Secondly, we have tested our algorithms for synthetic gapped motifs, (l, d) - X (m, n) - (l, d) signals by varying l, d and X (m, n) values. Finally, the same algorithm is used for real biological data sets and it is observed that our approach is also able to detect known gapped TFBSs more accurately and more efficiently.
    Keywords: Motif Finding, Particle Swarm Optimization (PSO), Swarm Intelligence (SI), Transcriptional Factor Binding Sites (TFBS), Gapped Motifs.

  • SMISS: A protein function prediction server by integrating multiple sources   Order a copy of this article
    by Renzhi Cao, Zhaolong Zhong, Jianlin Cheng 
    Abstract: SMISS is a novel web server for protein function prediction. Three different predictors can be selected for different usage. It integrates different sources to improve the protein function prediction accuracy, including the query protein sequence, protein-protein interaction network, gene-gene interaction network, and the rules mined from protein function associations. SMISS automatically switch to ab initio protein function prediction based on the query sequence when there is no homologs in the database. It takes fasta format sequences as input, and several sequences can submit together without influencing the computation speed too much. PHP and Perl are two primary programming language used in the server. The CodeIgniter MVC PHP web framework and Bootstrap front-end framework are used for building the server. It can be used in different platforms in standard web browser, such as Windows, Mac OS X, Linux, and iOS. No plugins or Java needed for our website. Availability: http://tulip.rnet.missouri.edu/profunc/.
    Keywords: protein function prediction; data integration; spatial gene-gene interaction network; protein-protein interaction network; chromosome conformation capturing.

  • Ortholog Detection: Pathway to Comparative Genomics   Order a copy of this article
    by MANPREET SINGH, SHAIFU GUPTA 
    Abstract: Accurate detection of orthologs is a key aspect of comparative genomics. Orthologs can be used to predict the function of newly sequenced genes from the model organisms as they retain the same biological function through the path of evolution. In this paper we describe different methods available for the detection of orthologs. Different computational methods, comprising of phylogenetic as well as pair-wise comparison methods are discussed and compared. Some other methods based on synteny and protein network comparisons are also discussed in the paper. The study shows that phylogenetic methods of detecting orthologs are comparatively accurate and reliable than the pair-wise graph based methods but computationally more intensive and slow. These should be used when we have sufficient computational power to operate. On the other hand Pair-wise approaches are fast and can handle large amount of data. Synteny based methods also form a good candidate for the detection of orthologs.
    Keywords: Orthologs; evolution; phylogenetic methods; comparative genomics; pair-wise methods; synteny.