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Comparative Genomics Tools

This interface allows the user to search for common OR specific genes/regions between a query genome/replicon and other genomes/replicons chosen from the ones available in our PkGDB database (i.e, (re)annotation of bacterial genomes or complete proteome downloaded from the RefSeq/WGS sections).
This interface allows the user to search for potentially horizontally transferred genes (HGT) which are gathered in genomic regions (Region of Genomic Plasticity). The RGP_Finder method first starts with the identification of synteny breaks between a query genome and other close genomes chosen from the ones available in our PkGDB database. Then it searches for HGT features (tRNA hotspot, mobility genes), and for compositional bias (AlienHunter (Vernikos and Parkhill, 2006), SIGI-HMM (Waack et al., 2006), and GC deviation computation) in the query genome. RGP_Finder is able to characterize genomic regions presenting both to a synteny break and several features specific to Genomic Islands, regions with HGT features only, and regions associated with synteny break only. The graphical interfaces associated to this tool are useful to explore in detail the predicted regions, using also the comparative genomic context available in MaGe.
This tool draws a global comparison, based on synteny results (the size of which can be selected by the user) between 2 bacterial genomes. The picture gives an overview of the conservation of synteny groups between the query genome and another genome chosen from the ones available in our PkGDB database (i.e, (re)annotation of bacterial genomes or complete proteome downloaded from the RefSeq/WGS sections).
This tool provides a list of candidate genes of a query genome potentially involved in a fusion or a fission event. These events are computed from the synteny results obtained with the genomes available in the PkGDB database. They are ordered using a score which reflect the "originality" of the event. The lowest scores are generally associated to events predicted because of the presence of pseudogenes either in the query genome (fission) or in the compared genomes (fusion).
This tool provides some statistics about the similarity results between the selected organism and all the genomes available in our PkGDB database. Among the computed values between two compared genomes are: the number and percentage of genes which are in BBH (Bidirectional Best Hit) and in synteny groups, the synteny groups number and size, etc. Note that, given the MicroScope re-annotation procedure on public genomes integrated in PkGDB, these values can slightly be different from the ones obtained in the section "RefSeq Synteny Statistics".
This tool provides some statistics about the similarity results between the selected organism and all the bacterial genomes available in RefSeq/WGS NCBI sections. Among the computed values between two compared genomes are: the number and percentage of genes which are in BBH (Bidirectional Best Hit) and in synteny groups, the synteny groups number and size, etc.
This interface provides an analysis of the pan-genome and its components (core-genome, variable-genome) for an organism set. It use the MicroScope gene families (MICFAM) which are computed with the SiLiX software (« Ultra-fast sequence clustering from similarity networks with SiLiX. », Miele V et al., 2011).
It allows the users to:
  • Compute pan-genome and core-genome sizes and their evolutions for a genome set
  • Determine the common and variable genome proportion for each genome
  • Exclude the pan, core and variable-genome of another genome set to the analysis
  • Extract core-genome, variable-genome and strain specific sequences and annotations.
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