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Sequence and expression of potato U2 snRNA genes
1Department of Cellular and Molecular Genetics, Scottish Crop Research Institute, Invergowrie, Dundee, UK.
Nucleic Acids Research
|January 25, 1991
Summary
Potato U2snRNA genes exhibit sequence variation but maintain structure. The PotU2-22 variant shows high expression across potato organs and related species, indicating functional significance.
Area of Science:
- Molecular Biology
- Plant Genetics
Background:
- Plant UsnRNA multigene families display significant sequence variation.
- The potato U2snRNA gene family comprises 25-40 genes with isolated variants.
Purpose of the Study:
- To investigate the expression patterns of different potato U2snRNA gene variants.
- To identify highly expressed U2snRNA genes in potato and related species.
Main Methods:
- Isolation and characterization of potato U2snRNA gene variants.
- RNase A/T1 protection assays to analyze transcript levels in various potato tissues and species.
Main Results:
- PotU2-22 demonstrated high expression in potato organs (leaf, stem, root, tuber) and in tobacco.
- PotU2-4 showed low expression, while PotU2-11 was unexpressed in analyzed tissues.
- Conserved secondary structure and promoter elements (USE, TATA-like box) were maintained across variants.
Conclusions:
- PotU2-22 represents a major functional U2snRNA gene subset in potato due to its high expression.
- Expression levels may be influenced by regulatory elements (USE, TATA) and gene copy number.
- High expression of PotU2-22 suggests conservation of functional U2snRNA coding regions in related species.