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Sequence and analysis of the tomato JOINTLESS locus.
1Clemson University Genomics Institute, 100 Jordan Hall, Clemson, South Carolina 29634, USA.
Plant Physiology
|July 18, 2001
Summary
Researchers analyzed the JOINTLESS locus in tomato, finding conserved gene order with Arabidopsis despite genome duplication differences. This study reveals small-scale microsynteny between these plant genomes.
Area of Science:
- Plant genetics
- Comparative genomics
- Molecular biology
Background:
- The JOINTLESS locus on tomato chromosome 11 was investigated.
- Repetitive sequences, including LTR retrotransposons and novel foldback transposons, were identified in this region.
- The association of repetitive elements with genes was explored.
Purpose of the Study:
- To characterize the genetic content of a 119-kb bacterial artificial chromosome from the tomato JOINTLESS locus.
- To compare tomato gene organization with the Arabidopsis genome to assess genome synteny.
- To investigate the role of repetitive sequences in gene association.
Main Methods:
- Bacterial artificial chromosome (BAC) sequencing and analysis.
- Identification and characterization of repetitive sequences (LTR retrotransposons, SSRs, foldback transposons, DNA repeats).
- Comparative genomic analysis using Arabidopsis genome data.
Main Results:
- The tomato BAC contained 15 putative genes and various repetitive sequences, including a novel type III foldback transposon.
- Foldback transposons and short DNA repeats were found to be preferentially associated with genes.
- Eleven out of 15 tomato open reading frames showed collinearity with segments in the Arabidopsis genome.
- Despite Arabidopsis's genome duplication, microsynteny was conserved at a small scale but complicated by large gene families.
Conclusions:
- The JOINTLESS locus region in tomato exhibits conserved microsynteny with Arabidopsis, indicating small-scale genome conservation.
- Repetitive elements, particularly foldback transposons, may play a role in gene association within the tomato genome.
- Comparative analysis highlights the complexities of conserved synteny in the face of differential genome evolution, such as whole-genome duplication events.