XMLPipeDB

A Reusable, Open Source Tool Chain for Building Relational Databases from XML Sources BOSC Vienna, Austria July 20, 2007 Kam D. Dahlquist Department of Biology Jeffrey Nicholas John David N. Dionisio Department of Electrical Engineering & Computer Science http://xmlpipedb.cs.lmu.edu Loyola Marymount University

Outline

Motivation

-- GenMAPP

-- Project requirements

XMLPipeDB Implementation

-- XSD-to-DB

-- UniProtDB and GODB

-- XMLPipeDB Utilities

-- GenMAPP Builder

Wish List for Development

Outline

Motivation

-- GenMAPP

-- Project requirements

XMLPipeDB Implementation

-- XSD-to-DB

-- UniProtDB and GODB

-- XMLPipeDB Utilities

-- GenMAPP Builder

Wish List for Development

How GenMAPP Works http://www.GenMAPP.org

Graphics tools make MAPPs that store gene IDs and

vector coordinates for all

graphical objects

Separate Expression Dataset

files store data and color-

coding instructions

Gene Databases store IDs,

annotation, and hyperlinks

to public gene and protein

databases

Stand-alone program implemented in Visual Basic,

accessory files are Microsoft Access databases

GenMAPP Design and Implementation

Stand-alone program implemented in Visual Basic

--program and source code available at www.GenMAPP.org

Back-end is Microsoft Jet Database Engine

Three types of databases used in program:

--MAPP database stores gene IDs and vector coordinates

for all graphical objects

--Expression Datasets store gene IDs, DNA microarray data,

and color-coding instructions

--Gene Database stores gene IDs and annotation from

major public databases

All databases are specific to a single species, users

match appropriate MAPPs, Expression Datasets, and

Gene Databases when using the program

MAPPFinder Determines Which GO Terms Are Overrepresented in a GenMAPP Expression Dataset

Maintaining and Updating GenMAPP Gene Databases has been a Bottleneck for Development

Microarrays use different gene ID systems for annotation;

users want as much information as possible.

We need to capture and reliably relate gene data from

different sources and keep the data updated.

Gene Database design is data-driven; it tells GenMAPP

what gene ID systems and relationships are present.

Current GenMAPP Gene Databases are built from

Ensembl as the main data source.

-- limited to (mostly) animal species

-- sensitive to changes in flat file formats

XMLPipeDB: A Reusable, Open Source Tool Chain for Building Relational Databases from XML Sources

Requirements:

to create Gene Databases for other species

(bacteria/plants) using UniProt as the main data source

to be robust to changes in source file formats

to use XML sources wherever possible

to take advantage of existing open source tools

to limit the manual manipulation of the data

First task, reported last year at BOSC, was to build a GenMAPP Gene Database for Escherichia coli K12

GenMAPP Gene Database Schema for Escherichia coli K12

Data Sources Required for a “Minimal” GenMAPP Gene Database UniProt • UniProt complete proteome sets for many species are made available as XML downloads by the Integr8 resource Gene Ontology • OBO XML format UniProt to GO associations • GOA downloads also available at Integr8

XMLPipeDB Use Case Diagram

Produces: Java source code SQL DDL file Hibernate mappings Apache Ant build.xml

UniProtDB and GODB Required Only Nominal Post-processing

• Naming: XSD or DTD definitions might use names that

are SQL reserved words and thus cannot be used as

table or attribute names

-- In UniProtDB, “end” was renamed to “endPosition”

-- In GODB, “to” was renamed to “to_”

Datatypes: Some XSD datatypes are not easily

supported in SQL

-- In UniProtDB, the definition for citationType was changed

from month/year to string

-- Some definitions were changed from SQL varchar(255)

to varchar(unspecified length)

Schema diagram automatically generated with third party tool

“ Rule of Three” XMLPipeDB Utilities Library is a Suite of Java Classes that Provide Functions Common to Most XMLPipeDB Database Applications

Loading of XML files into Java objects

Saving XML-derived Java objects to a relational database

Rudimentary query and retrieval of Java objects from

the relational database

-- HQL (Hibernate Query Language), SQL query

-- object browser that shows results of query

Configuring a client application to communicate with

a relational database

GenMAPP Builder Interacts with PostgreSQL in Three Ways

GenMAPP Builder Uses the XMLPipeDB Utilities Library to Configure the PostgreSQL Database … and import XML

GenMAPP Builder Has

Customized Profiles

for each Primary Data Source

(currently only UniProt)

for each species (currently

Escherichia coli K12 and

Arabidopsis thaliana )

based on TaxonID

The User Chooses Which Gene ID Systems and Relations to Export to the Gene Database

GenMAPP Gene Database for Escherichia coli K12 Was the First Milestone for XMLPipeDB

Loading the XML files into the PostgreSQL database

took approximately 20 minutes

--UniProt XML (44 MB)

--GO XML (13 MB)

Export of the Gene Database took approximately 2 hours

Data integrity was checked by hand

--all 4329 records from UniProt were successfully exported

to the Gene Database

--our Gene Database is missing 219 Blattner IDs

--the missing IDs were not present in the UniProt XML

157 RNA genes

1 origin of replication

51 protein coding sequences

10 no feature designation

The Next Challenge was to Create a Gene Database for the Plant, Arabidopsis thaliana

Creating an Arabidopsis Gene Database required refactoring the code

The Arabidopsis UniProt proteome set has 34,566 proteins

--UniProt XML file is 237 MB

--order of magnitude larger than Escherichia coli

GenMAPP Builder initially failed to import the large XML file

--the file had to be broken into smaller individual files programmatically

Export of the Gene Database requires 2 GB RAM and takes > 7 hours

While we captured all but 51 of E. coli protein-encoding genes;

we are missing 1173 protein-encoding genes in TAIR

--mapping between TAIR and UniProt seems poor; TAIR IDs appear

in many different fields in XML

Have implemented crude data integrity checks that tally IDs in XML for comparison with exported database, need more

Wish List for XMLPipeDB Development

Additional XML datasources

Additional data management features for XPDutils

--shift loading of GOA file to import process

--add/delete species data

Automate data integrity checks

GUI needs substantial work

XSD-to-DB Adam Carasso Jeffrey Nicholas Scott Spicer XMLPipeDBUtils David Hoffman Babak Naffas Jeffrey Nicholas Ryan Nakamoto UniProtDB Joe Boyle Joey Barrett GODB Scott Spicer Roberto Ruiz GenMAPP Builder Joey Barrett Jeffrey Nicholas Scott Spicer Special Thanks GenMAPP.org Development Group Caskey L. Dickson, Wesley T. Citti NSF CCLI Program (http://recourse.cs.lmu.edu) http://xmlpipedb.cs.lmu.edu LMU Bioinformatics Group Kam D. Dahlquist http://myweb.lmu.edu/kdahqui [email_address] John David N. Dionisio http://myweb.lmu.edu/dondi [email_address]