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Aberrant splicing of intron 1 leads to the heterogeneous 5′ UTR and decreased expression ofwaxy gene in rice cultivars of intermediate amylose content.
- Source :
-
Plant Journal . May98, Vol. 14 Issue 4. 1 Diagram, 2 Charts. - Publication Year :
- 1998
-
Abstract
- Summary: We have previously reported that three distinct patterns of waxy (Wx) gene transcript accumulation were present in 31 rice cultivars. The cultivars with high amylose content (group I) contain a 2.3 kb mature Wx mRNA, cultivars with intermediate amylose content (group II) produce both a 3.3 kb Wx pre-mRNA, which contains intron 1, and the 2.3 kb Wx mature mRNA, and cultivars with no amylose (group III) accumulate only the 3.3 kb Wx pre-mRNA. Analyses of the cDNAs reveals that four splice donor sites and three splice acceptor sites in intron 1 give rise to six splicing patterns in 2.3 kb Wx mRNA of group II cultivars. In addition, aberrant intron 1 excision causes either deletion of 4 or 5 nucleotides, or addition of 7 and 13 nucleotides at the junction of exon 1 and exon 2 of the 2.3 kb mRNA. In contrast, only one normal splicing pattern (one splice donor site and one splice acceptor site) was found in the 2.3 kb mRNA of group I cultivars. Nucleotide sequences of the Wx intron 1 in group I and group II cultivars differ by 16 individual bases. We suggest that these deletions or additions contribute to inefficient splicing of intron 1 from the 3.3 kb Wx pre-mRNA, as well as an aberrant splicing of the Wx intron 1 to produce the 2.3 kb mRNA with a heterogeneous 5′ untranslated region (5′-UTR). As a consequence, the total amount of translatable Wx mRNA, and therefore the Wx protein and amylose content, are reduced in the group II cultivars compared with the group I cultivars. [ABSTRACT FROM AUTHOR]
- Subjects :
- *RNA splicing
*INTRONS
RICE genetics
Subjects
Details
- Language :
- English
- ISSN :
- 09607412
- Volume :
- 14
- Issue :
- 4
- Database :
- Academic Search Index
- Journal :
- Plant Journal
- Publication Type :
- Academic Journal
- Accession number :
- 5089848
- Full Text :
- https://doi.org/10.1046/j.1365-313X.1998.00126.x