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Exploring the plant transcriptome through phylogenetic profiling
Klaas Vandepoele1, Yves Van de Peer
1Department of Plant Systems Biology, Flanders Interuniversity Institute for Biotechnology , Ghent University, B-9052 Ghent, Belgium.
Plant Physiology
|January 13, 2005
Summary
This study integrates plant protein and expressed sequence tag (EST) data to identify over 12,000 gene families, revealing novel plant proteins and evolutionary insights. The research uncovers conserved and unique gene families across diverse plant species.
Area of Science:
- Plant genomics
- Comparative genomics
- Evolutionary biology
Background:
- Public protein databases are incomplete, missing many plant genes.
- Expressed Sequence Tags (ESTs) offer a broader view of transcribed plant genes.
- Integrating diverse sequence data (protein and EST) is challenging.
Purpose of the Study:
- To combine plant protein and EST data for comprehensive gene family analysis.
- To identify novel plant proteins and gene families.
- To investigate plant gene evolution and distribution across species.
Main Methods:
- Integrated publicly available protein and EST sequences from 32 plant species.
- Utilized phylogenetic profiling to analyze gene family distribution.
- Compared gene family sizes and composition between rice and Arabidopsis.
Main Results:
- Identified over 12,000 plant gene families and >250,000 proteins.
- Discovered that ~60% of identified proteins are new to current databases.
- Found similar gene family numbers in monocots and eudicots, with rice having more genes than Arabidopsis due to species-specific genes and families.
Conclusions:
- The integrated dataset significantly expands knowledge of plant gene families.
- Phylogenetic profiling provides insights into plant gene evolution, identifying conserved and lineage-specific genes.
- Rice's larger gene count compared to Arabidopsis is partly explained by unique gene families and single-copy genes.