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bioconductor-organismdbi

The package enables a simple unified interface to several annotation packages each of which has its own schema by taking advantage of the fact that each of these packages implements a select methods.

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OrganismDbi

Dependencies & Environment

Package-intrinsic requirements from the Bioconductor landing page — reproduce in any R environment.

  • Version: 1.54.0 · Bioconductor: 3.23 · R: ≥ 4.6
  • Depends: BiocGenerics, AnnotationDbi, Seqinfo, GenomicFeatures
  • Imports: DBI, BiocManager, Biobase, graph, RBGL, S4Vectors, IRanges, GenomicRanges
  • System requirements: URL
  • Install: BiocManager::install("OrganismDbi")

When to Use

  • Unified Annotation Queries: Querying multiple annotation resources (e.g., TxDb and OrgDb) simultaneously through a single unified interface using select.
  • Custom Meta-Package Building: Building custom OrganismDbi meta-packages (like Homo.sapiens) that link genome-centric and gene-centric databases using makeOrganismPackage.
  • Feature Extraction: Extracting genomic features (transcripts, exons, cds) mapped directly to gene symbols or other identifiers using transcripts, exons, or cds.
  • Grouped Feature Extraction: Grouping genomic features by a specific identifier (e.g., by gene) using transcriptsBy, exonsBy, or cdsBy.

When NOT to Use

  • Non-Model Organisms: When working with non-model organisms that do not have pre-built OrgDb or TxDb packages available to link together.
  • Cyclic Graph Relationships: When the relationships between your annotation packages present more than one pathway between any two nodes/objects (the package cannot handle cycles in the graph).

Data Requirements

  • Annotation Packages: Installed Bioconductor annotation packages (e.g., org.Hs.eg.db, TxDb.Hsapiens.UCSC.hg19.knownGene, GO.db).
  • Graph Data: A list of short two-element character vectors representing foreign key relationships (e.g., graphData) when building custom packages.

Key Parameters

  • keys: The character vector of keys to search for in select or keys.
  • keytype: The type of input keys (e.g., "ENTREZID") provided to select or keys.
  • columns: The columns of information to retrieve (e.g., c("TXNAME", "SYMBOL")) in select, transcripts, or transcriptsBy.
  • by: The grouping factor (e.g., "gene") used in transcriptsBy.
  • pkgname: The name of the custom package to create (e.g., "Homo.sapiens") in makeOrganismPackage.
  • graphData: The list expressing how different packages relate to each other via foreign keys in makeOrganismPackage.

Best Practices

  • Inspect Fields: Use keytypes() and columns() to inspect valid query fields before executing a search.
  • Use Select: Prefer using the unified select() method to retrieve multi-database annotations in a single tabular format.
  • GRanges Integration: When extracting genomic ranges, use functions like transcripts(Homo.sapiens, columns=...) to get GRanges objects pre-annotated with gene metadata.
  • Consistent Builds: Take extra care to ensure that the different packages used in makeOrganismPackage are from the same build (e.g., hg19).

Common Pitfalls

  • Conflicting Package Schemas: Mixing incompatible TxDb and OrgDb versions. Fix: Ensure the underlying TxDb and OrgDb packages correspond to the same genome assembly and annotation release.
  • Non-Unique Columns: Having more than one example of each field across supporting packages. Fix: Ensure all values returned by columns are unique across ALL of the supporting packages before using makeOrganismPackage.
  • Graph Cycles: Providing a graphData list with multiple pathways between nodes. Fix: Choose exactly one foreign key relationship to connect any two packages in your graph.

Alternatives

  • AnnotationDbi: The base package for querying individual OrgDb databases.
  • GenomicFeatures: Specifically for managing and querying TxDb transcript databases.

Citations

  • Carlson M, Atiku Mustapha A (2026). OrganismDbi: A meta framework for Annotation Packages.

References

<!-- biomate-cta -->

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