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Retrotransposon insertion into the maize waxy gene results in tissue-specific RNA processing
1Department of Botany, University of Georgia, Athens 30602, USA.
The Plant Cell
|June 1, 1997
Summary
Maize waxy (wx) gene alleles exhibit tissue-specific splicing. The wxG allele shows 30-fold higher correctly spliced RNA in pollen versus endosperm, impacting WX enzyme activity.
Area of Science:
- Plant Molecular Biology
- Genetics
- Gene Expression Regulation
Background:
- Retrotransposon insertions in maize waxy (wx) gene introns cause alternative splicing.
- Residual gene expression in endosperm is linked to inefficient splicing of intronic elements.
Purpose of the Study:
- To investigate the tissue-specific phenotype of the maize wxG allele.
- To determine the molecular basis for differential WX enzymatic activity in pollen and endosperm.
Main Methods:
- Quantification of wxG-encoded transcripts in maize pollen and endosperm.
- Analysis of RNA processing and splicing efficiency in different tissues.
Main Results:
- The wxG allele exhibits a 30-fold higher WX enzymatic activity in pollen compared to endosperm.
- This activity difference correlates with a 30-fold greater abundance of correctly spliced wxG RNA in pollen versus endosperm.
- Tissue-specific differences in RNA processing account for the observed phenotype.
Conclusions:
- The wxG allele's tissue-specific phenotype is driven by differential RNA splicing efficiency between pollen and endosperm.
- Hypothesized that differences in splicing factor concentrations contribute to this tissue-specific alternative splicing, analogous to animal systems.