Load GFF Into Chado
Download the GFF3 Files
An easy way
to load data into the database is to use a GFF3 file and the script
load/bin/gmod_bulk_load_gff3.pl. A good set of sample data is the GFF3 file prepared by the nice folks at the Saccharomyces Genome Database:
This file contains Gene Ontology (GO) annotations, so if you didn't load GO when you executed
make ontologies you will get many warning messages about being unable to find entries in the dbxref table. If you want to
load GO you should be able to execute
make ontologies and select Gene Ontology for installation.
Add an Entry for Your Organism
You will need to have an entry for your species in the Chado organism table. If you are unsure if this entry exists log into your database and execute this SQL command:
SELECT common_name FROM organism;
If you do not see your organism listed, execute a command equivalent to this:
INSERT INTO organism (abbreviation, genus, species, common_name) VALUES ('S.cerevisiae', 'Saccharomyces', 'cerevisiae', 'yeast');
Substitute in the appropriate values for your own organism if it's not yeast.
Load the GFF3
> gmod_gff3_preprocessor.pl --gfffile saccharomyces_cerevisiae.gff --outfile saccharomyces_cerevisiae.sorted.gff
>gmod_bulk_load_gff3.pl --organism yeast --gfffile saccharomyces_cerevisiae.sorted.gff
This loads the GFF3 file. The loading script requires GFF3 as it has tighter control of the syntax and requires the use of a controlled vocabulary (from Sequence Ontology Feature Annotation (SOFA)), allowing mapping to the relational schema. In addition to supplying the location of the file with the
--gfffile flag, the
--organism tag uses the common name (
common_name field) from the Chado organism table. Do
perldoc gmod_bulk_load_gff.pl for more information on adding other organisms and databases, as well as other available command line flags.
gmod_load_gff3.pl is also available, but is limited in how much it has been supported and in how flexible it currently is. It is
a good example of how to write code using Class::DBI classes that are created at the time of install. For more information on using these classes, see Modware for a Class::DBI-based middleware/API.
Creating GFF3 from UniProt/SwissProt Files
A recent update (April 2007) to
bp_genbank2gff3.pl extends it to handle Swiss and EMBL format input, along with GenBank. You can now create GFF3 entries of UniProt sequences suited to loading into Chado, including most of the protein description, Dbxref, and related fields useful in annotating genome matches. Use the
--format Uniprot flag to specify this input format (
--format EMBL can also be useful).
>bp_genbank2gff3.pl --noCDS --in uniprot-subset.dat --format Uniprot >gmod_bulk_load_gff3.pl --database mygenome --gff uniprot-subset.dat.gff --organism fromdata
--organism fromdata flag to load UniProt with many organisms.
This code needs to be tested. Please help improve this section with your tests.
See the related HOWTO Load RefSeq Into Chado.
Please send questions to the GMOD developers list:
Or contact the GMOD Help Desk