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Updated: Jul 5, 2025
Phage Phenomics: Physiological Approaches to Characterize Novel Viral Proteins
Published on: June 11, 2015
Improving the Comprehension of Pathogenicity and Phylogeny in 'Candidatus Phytoplasma meliae' through Genome
Franco Daniel Fernández1,2, Xiao-Hua Yan3, Chih-Horng Kuo3
1Instituto Nacional de Tecnología Agropecuaria (INTA), Centro de Investigaciones Agropecuarias (CIAP), Instituto de Patología Vegetal (IPAVE), Camino 60 cuadras km 5 ½ (X5020ICA), Córdoba X5020ICA, Argentina.
Abstract:
'Candidatus Phytoplasma meliae' is a pathogen associated with chinaberry yellowing disease, which has become a major phytosanitary problem for chinaberry forestry production in Argentina. Despite its economic impact, no genome information of this phytoplasma has been published, which has hindered its characterization at the genomic level. In this study, we used a metagenomics approach to analyze the draft genome of the 'Ca. P. meliae' strain ChTYXIII. The draft assembly consisted of twenty-one contigs with a total length of 751.949 bp, and annotation revealed 669 CDSs, 34 tRNAs, and 1 set of rRNA operons. The metabolic pathways analysis showed that ChTYXIII contains the complete core genes for glycolysis and a functional Sec system for protein translocation. Our phylogenomic analysis based on 133 single-copy genes and genome-to-genome metrics supports the classification as unique 'Ca. P. species' within the MPV clade. We also identified 31 putative effectors, including a homolog to SAP11 and others that have only been described in this pathogen. Our ortholog analysis revealed 37 PMU core genes in the genome of 'Ca. P. meliae' ChTYXIII, leading to the identification of 2 intact PMUs. Our work provides important genomic information for 'Ca. P. meliae' and others phytoplasmas for the 16SrXIII (MPV) group.
Insights
This study presents the first draft genome of Candidatus Phytoplasma meliae, a pathogen causing chinaberry yellowing disease. The genomic data offers crucial insights into its unique classification and potential virulence factors.
Area of Science:
- Plant Pathology
- Genomics
- Phytoplasma Research
Background:
- Candidatus Phytoplasma meliae causes chinaberry yellowing disease, a significant agricultural issue in Argentina.
- Lack of genomic data has limited the characterization of this important phytoplasma.
Purpose of the Study:
- To perform a comprehensive genomic analysis of Candidatus Phytoplasma meliae using a metagenomics approach.
- To provide foundational genomic information for Candidatus Phytoplasma meliae and related phytoplasmas.
Main Methods:
- Metagenomic sequencing and draft genome assembly of Candidatus Phytoplasma meliae strain ChTYXIII.
- Bioinformatic analysis including gene annotation, metabolic pathway reconstruction, and phylogenomic analysis.
- Identification and characterization of putative effector proteins and Phytoene Desaturase (PDS) gene families.
Main Results:
- A draft genome assembly of 751,949 bp with 669 coding sequences (CDSs), 34 tRNAs, and rRNA operons was generated.
- Phylogenomic analysis confirmed Candidatus Phytoplasma meliae as a distinct species within the MPV clade.
- 31 putative effectors, including SAP11 homologs, and 2 intact Phytoene Desaturase (PDS) gene families were identified.
Conclusions:
- The study provides the first genomic resource for Candidatus Phytoplasma meliae, enabling deeper understanding of its biology.
- Genomic insights support the unique classification of Candidatus Phytoplasma meliae and highlight potential virulence mechanisms.
- This work is vital for phytoplasma research, particularly for the 16SrXIII (MPV) group.
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