Plant Proteogenomics: Improvements to the Grapevine Genome Annotation

Area of Science:

• Plant Genomics
• Proteomics
• Bioinformatics

Background:

• Grapevine (Vitis vinifera) is crucial for the wine industry and has health implications.
• Previous genome annotation efforts for grapevine cultivars like Pinot Noir have been undertaken.
• Accurate genome annotation is essential for understanding grapevine biology and traits.

Purpose of the Study:

• To further contribute to grapevine genome annotation through a comprehensive proteogenomics analysis.
• To identify novel genomic features and revise existing gene models.
• To investigate potential inaccuracies in the current grapevine genome assembly.

Main Methods:

• Proteogenomics analysis integrating the latest CRIBI genome annotation, a Cabernet Sauvignon proteomics dataset, and RNA-seq data.
• Utilized the Augustus gene prediction tool to identify novel and revised genes and protein isoforms.
• Comparative analysis of predicted genes against the existing genome assembly.

Main Results:

• Identified 341 novel annotation events, including frame-shifts, translated UTRs, exon boundaries, novel splices, novel exons, gene boundaries, reverse strands, and novel gene events.
• Predicted 52 novel and revised genes (54 protein isoforms) using proteogenomics evidence.
• Highlighted a potential over-assembly in the grapevine genome, particularly on chromosome 7.

Conclusions:

• The proteogenomics approach significantly enhances grapevine genome annotation accuracy and completeness.
• The identified novel genes and revised annotations provide valuable insights into grapevine genetics, including traits like stress tolerance and wine characteristics.
• The study suggests a need for re-evaluation and refinement of the current grapevine genome assembly.