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Hypomethylated sequences: characterization of the duplicate soybean genome
T Zhu1, J M Schupp, A Oliphant
1Department of Biological Sciences, Northern Arizona University, Flagstaff 86011.
Molecular & General Genetics : MGG
|September 28, 1994
Summary
Soybean
Area of Science:
- Genomics
- Molecular Biology
- Plant Science
Background:
- Soybean (Glycine max) is thought to be a diploidized tetraploid.
- Understanding its genomic structure and methylation is key to its evolution.
Purpose of the Study:
- Investigate soybean's genomic structure and methylation patterns of duplicated sequences.
- Examine sequence loss and methylation during diploidization.
Main Methods:
- Used hypomethylated genomic DNA as probes.
- Analyzed 45 Phaseolus vulgaris and 664 Glycine max genomic clones.
- Performed Southern analysis and restriction enzyme digestion (MspI, HpaII).
Main Results:
- Over 15% of hypomethylated regions were single-copy; ~85% were duplicated/repetitive.
- Estimated 25% of single-copy sequences lost during diploidization.
- Homeologous duplicated regions were hypomethylated, with some low-level methylation.
Conclusions:
- Duplicate sequences appear to be eliminated during soybean's diploidization process.
- No evidence suggests methylation silences duplicated sequences during this process.