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Marker utility of miniature inverted-repeat transposable elements for wheat biodiversity and evolution
Beery Yaakov1, Elif Ceylan, Katherine Domb
1Department of Life Sciences, Ben-Gurion University, 84105 Beer-Sheva, Israel.
Summary
Miniature inverted-repeat transposable elements (MITEs) reveal significant genetic diversity in wheat and its relatives. MITE markers provide insights into wheat genome evolution, origin of polyploid wheat, and population dynamics.
Area of Science:
- Plant genetics
- Genomics
- Evolutionary biology
Background:
- Transposable elements (TEs) constitute a large portion of the wheat genome and drive its evolution.
- The specific role of TEs in wheat genome divergence remains unclear.
Purpose of the Study:
- To develop and utilize Miniature Transposable Element (MITE) markers to assess genetic diversity and evolutionary relationships in Triticum and Aegilops species.
- To investigate MITE dynamics and their contribution to wheat genome evolution.
Main Methods:
- Development of 55 MITE markers based on presence/absence of elements.
- Application of MITE markers to assess genetic diversity across diploid, tetraploid, and hexaploid wheat and related species.
- Phylogenetic analysis using MITE marker data.
Main Results:
- Over 60% of MITE insertions were associated with wheat genes.
- 81.8% of MITE markers displayed polymorphic insertions, indicating significant genetic variation.
- Phylogenetic analysis clustered species by genus, genome composition, and ploidy level.
- A 47.13% genetic divergence was observed between diploid and polyploid wheat clusters.
Conclusions:
- MITE markers are effective tools for revealing genetic diversity and evolutionary patterns in wheat.
- MITE dynamics contribute to wheat genome evolution, particularly in wild emmer populations.
- MITEs may help elucidate the origin of the B-genome in polyploid wheat.
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