The gene CO-expression Browser
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cob Fixed log spacing button position Dec 18, 2017


COB - The Co-expression Browser

COB is a complete client/server package built to browse gene co-expression networks created by Camoco. The client is written in javascript, and the server is written in python.

Getting Started

This package is entirely dependent on Camoco. It is is designed such that once the Camoco has been installed, COB can be added by, inside the camoco virtual environment, running:

$ pip install <PYPI NAME>

Once installed, COB has a convinient command line interface to manage the server. To run it with all of the default options, no options are required, just execute in the camoco virtual environment:

$ cob

This will start the server in the current terminal window. To see the site, navigate to http://localhost:50000 in your web browser once the server has finished loading. To terminate the server, press Ctrl+C in the same terminal window. To run the server in the background, add the -d flag to the start command. To terminate all instances of the COB server, run cob -k. To define a specific server to kill, add the -n flag followed by the name of the server as such:

$ cob -k -n my_server

To use a specific configuration file for server settings, the file may be defined with the -c flag:

$ cob -c my_server.conf

If no configuration file is defined, COB then checks for a section web in the main camoco configuration file ~/.camoco.conf. If there are no settings in that file, it will load with default values. The full configuration options are discussed in the next section.

This is the full documentation for all cob CLI options, which can also be accessed by executing cob -h:

usage: cob [-h] [-c USERCONF] [-d] [-k] [-l] [-n NAME]

Manage instances of the COB server.

optional arguments:
  -h, --help            show this help message and exit
  -c USERCONF, --config USERCONF
                        Provide a YAML formatted configuration file, if not
                        provided, general Camoco config file is used.
  -d, --daemon          Run gunicorn as a daemon (allows closing of this
  -k, --kill            Kill running server. Use '-n' to define specific
                        server to kill otherwise all will be.
  -l, --list            Kill running server. Use '-n' to define specific
                        server to kill otherwise all will be.
  -n NAME, --name NAME  Name of server to start or kill.


A powerful configuration engine is provided to both set options for the server and also options for the content for the website, such as default option values. As mentioned above, these can either be provided through a standalone YAML configuration file (example.conf is included in the repo) or in a section with the same format titled web in the main camoco configuration file (found at ~/.camoco.conf). One need not include one at all, this will just be started with the default values (seen below). This will also trigger all available Camoco networks and GWAS datasets to be loaded in. To prevent this, one may specify the desired datasets. The following is an annotated version of the default settings, showing all the potential configuration options:

Server Options

name: cob                   # The name of this server instance, must be unique for 
                            #      each instance, can be overridden by '-n' flag
port: 50000                 # Port to which the server will be attached
threads: 8                  # How many individual threads the sever process may use
timeout: 500                # How long a thread maybe unresponsive before termination


networks:                   # Camoco networks that are to be loaded in the server.
  - My_Network_1            #      If this is not included, all available Camoco
  - My_Network_2            #      networks will be loaded.
gwas:                       # GWAS datasets that will be loaded in the server. If
  - My_GWAS_1               #      this is not included, all GWAS datasets that 
                            #      correspond to loaded networks will be loaded.

Default Values

defaults:                   # This is the dictionary containing all of the defaults
                            #      for the options on the web site
  logSpacing: True          # Spacing of genes in Polywas layout, log or true distance
  visEnrich: True           # Only enrich genes visible on graph or all in table
  fdrFilter: True           # Whether to use FDR to filter query results
  nodeCutoff: 1             # How many edges a node must have to be visible
  edgeCutoff: 3.0           # The cutoff for significance of edge scores
  fdrCutoff: 0.35           # If the FDR Filter is used, the cutoff for being visible
  windowSize: 50000         # Window size used in the query
  flankLimit: 2             # Flank limit used in the query
  visNeighbors: 25          # Default number of neighbors visible in custom network
  nodeSize: 10              # Size of the nodes on the graph
  pCutoff: 0.05             # P value cutoff for enrichment queries
  minTerm: 5                # Minimum number of genes a GO term must have to be included
  maxTerm: 300              # Maximum number of genes a GO term must have to be included

Reference Links

This section allows for linking directly from genes to an external website for more information. This can be configured for each different reference genome (RefGen) used to build the included networks. If not included, the option won't appear. To configure this,start by writing the name of the RefGen under the refLinks option, followed by a colon and a space as seen below. Then you must go to the database you wish to use for that RefGen, and search any gene. After finding this, copy the URL onto the line after the name of the RefGen. Finally replace the name of the gene in the URL with the string {id}. This allows the website to find where in the URL the gene name goes, and replace it with any gene for that organism. The following example works for maize, soybean, and medicago. Add or subtract species at will.



If you care to make this site accessible to the web, you can add a reverse proxy to Apache, allowing for access by using a normal URL. An example of how to do this is provided here, but for more detailed documentation, see the Apache docs.

<VirtualHost *:80>
       ProxyPass /cob
       ProxyPassReverse /cob/
</VirtualHost *:80>


FDR results are now simply provided by the GWASData class in Camoco, thus to add them to the site, simply initialize them for their respective reference genome or GWAS data set and they will appear. This method will be deprecated pending future direct inclusion of this functionality into the Camoco OverlapAnalysis class. Stay tuned for future changes.