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Sequence analysis of two plasmids from the phytoplasma beet leafhopper-transmitted virescence agent
Lia W Liefting1, Mary E Shaw2, Bruce C Kirkpatrick1
1Department of Plant Pathology, University of California, Davis, CA 95616, USA.
Microbiology (Reading, England)
|June 9, 2004
Summary
The complete nucleotide sequences of two beet leafhopper-transmitted virescence agent (BLTVA) plasmids were determined. Plasmid pBLTVA-1 features 11 ORFs, including a unique DNA primase gene, while pBLTVA-2 is a near-identical fragment.
Area of Science:
- Plant pathology
- Molecular biology
- Genomics
Background:
- Phytoplasmas are plant-pathogenic bacteria lacking cell walls.
- Beet leafhopper-transmitted virescence agent (BLTVA) causes significant crop damage.
- Understanding BLTVA plasmids is crucial for disease management.
Purpose of the Study:
- To determine the complete nucleotide sequences of BLTVA plasmids.
- To identify putative open reading frames (ORFs) and their functions.
- To analyze plasmid variability across different BLTVA strains.
Main Methods:
- Whole-genome sequencing of BLTVA plasmids.
- Bioinformatic analysis of nucleotide sequences.
- Comparative analysis of plasmid sequences from multiple strains.
Main Results:
- The larger plasmid, pBLTVA-1 (10,785 nt), contains 11 ORFs, many with duplicated/triplicated regions and a 338 nt tandem repeat.
- ORF9 shows homology to bacterial DNA primase genes, possessing zinc finger and topoisomerase/primase domains.
- The smaller plasmid, pBLTVA-2 (2,587 nt), is nearly identical to a portion of pBLTVA-1, including the tandem repeat.
- Analysis of 30 BLTVA strains revealed conserved ORFs but variable plasmid sizes.
Conclusions:
- BLTVA plasmids possess unique genetic features, including a potential DNA primase gene.
- Plasmid structure and size variation may influence BLTVA biology and pathogenicity.
- Further research into BLTVA plasmid functions is warranted.