NEMBASE4

NEMBASE4 provides a repository and analysis resource for nematode expressed sequence tag (EST) and transcriptome data to support gene identification, polypeptide prediction, and discovery of nematode-specific protein families relevant to drug and vaccine target research.

Key Features:

• Extensive Genomic Database: Hosts approximately 100,000 EST sequences derived from 10 different nematode species along with associated metadata.
• Non-Redundant Gene Objects: Processes EST sequences into non-redundant gene objects termed 'partial genomes' for each species.
• Advanced Query Capabilities: Supports queries based on BLAST annotation, sequence similarity, and expression profiles.
• SimiTri Tool: Includes SimiTri, a Java-based application for simultaneous display and analysis of relative similarity relationships among groups of sequences across three databases to identify genes with unique phylogenetic affinities, including candidates for horizontal gene transfer.
• Polypeptide Prediction Pipeline (prot4EST): Implements prot4EST to generate polypeptide translations from ESTs, addressing sequencing errors and incomplete transcripts and enabling translation without extensive full-length training sets.
• Nematode-Specific Gene Families: Identifies protein families restricted to the phylum Nematoda for prioritization as drug and vaccine targets.

Scientific Applications:

• Genomic Diversity Exploration: Enables comparative analysis across nematode species to detect conserved and unique genes and infer evolutionary relationships within Nematoda.
• Drug Discovery and Vaccine Design: Supports identification and prioritization of nematode-specific protein families as candidate targets for therapeutic and vaccine development against parasitic nematodes.
• Functional Annotation Improvement: Improves functional annotation of EST-derived sequences via prot4EST and BLAST-based annotation to support downstream analyses.

Methodology:

EST sequences and metadata are processed into non-redundant 'partial genomes'; annotation and queries use BLAST, sequence similarity, and expression-profile-based searches; SimiTri compares relative similarity across three databases; prot4EST performs polypeptide prediction from ESTs addressing sequencing errors and incomplete transcripts without requiring full-length training sets.