GFF-Ex

GFF-Ex extracts nucleotide sequences defined in GFF (Generic/General Feature Format) files and assigns boundaries for inferred features to enable feature-based genomic sequence retrieval for downstream analysis.

Key Features:

• Automated Sequence Extraction: Extracts sequences corresponding to genomic features annotated in GFF files.
• Boundary Assignment for Inferred Features: Assigns boundaries for features not explicitly defined in GFF, including introns, intergenic regions, and upstream gene areas.
• Export of Primary Sequence Information: Writes primary sequence data into predefined, feature-specific output files.
• Implementation: Composed of UNIX Shell and PERL scripts for sequence extraction and feature handling.

Scientific Applications:

• Genome annotation and re-annotation: Retrieval of feature sequences to support annotation workflows and updates.
• Gene structure, regulation, and function analysis: Provision of intron, upstream, and intergenic sequences for studies of gene architecture and regulatory regions.
• Secondary and meta-analysis: Generation of feature-specific sequence datasets for comparative analyses and downstream bioinformatics processing.

Methodology:

Parses GFF files to extract sequences, assigns boundaries to inferred features such as introns, intergenic regions, and upstream gene areas, and exports primary sequences into feature-specific output files using UNIX Shell and PERL scripts.