Dissecting the Opaque-2 regulatory network using transcriptome and proteome approaches along with enzyme activity measurements
The Opaque-2 (O2) gene encodes a transcriptional activator specifically expressed for grain development of maize. o2 mutants have an opaque and chalky kernel, with a decrease in zein storage protein content, and an increase in the proportions of lysine and tryptophan. In this review, we present rece...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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Universidade de São Paulo
2002-06-01
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| Series: | Scientia Agricola |
| Subjects: | |
| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000200031&tlng=en |
| _version_ | 1818731218321014784 |
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| author | Agnès Lefèvre Luciano Consoli Salete A. Gaziola Ana Paula Pellegrino Ricardo A. Azevedo Catherine Damerval |
| author_facet | Agnès Lefèvre Luciano Consoli Salete A. Gaziola Ana Paula Pellegrino Ricardo A. Azevedo Catherine Damerval |
| author_sort | Agnès Lefèvre |
| collection | DOAJ |
| description | The Opaque-2 (O2) gene encodes a transcriptional activator specifically expressed for grain development of maize. o2 mutants have an opaque and chalky kernel, with a decrease in zein storage protein content, and an increase in the proportions of lysine and tryptophan. In this review, we present recent results investigating genetic properties of the O2 network, using transcriptome and proteome approaches, associated with measurements of activities of enzymes of the aspartate pathway and lysine degradation. The structural polymorphism at the O2 locus was investigated by RFLP in a collection of 51 maize inbred lines. Most polymorphic sites were found outside the coding regions. We then searched for relationships between RFLP polymorphism and (i) mRNA abundance of O2 and of known or suspected target genes, (ii) activity of SDH and (iii) amount of zein isoforms. Polymorphic restriction sites in the 5' upstream regions of the O2 gene were found associated with O2 mRNA abundance (three sites) and the amount of two 19 kDa alpha-zein isoforms (two sites). One restriction site on the 3' side of the O2 gene was found associated with Lor/Sdh mRNA abundance. Our results indicate relationships between polymorphism at the O2 locus and the expression of some of its target genes. Evidence of these associations has to be confirmed on larger samples, and the analysis of the O2 gene sequence should allow more precise testing of the actual involvement of O2 polymorphism in its own transcriptional expression, and in the expression of its target genes. |
| first_indexed | 2024-12-17T23:14:11Z |
| format | Article |
| id | doaj.art-a5a085865c764e798c48a0ecb4502a60 |
| institution | Directory Open Access Journal |
| issn | 1678-992X |
| language | English |
| last_indexed | 2024-12-17T23:14:11Z |
| publishDate | 2002-06-01 |
| publisher | Universidade de São Paulo |
| record_format | Article |
| series | Scientia Agricola |
| spelling | doaj.art-a5a085865c764e798c48a0ecb4502a602022-12-21T21:29:03ZengUniversidade de São PauloScientia Agricola1678-992X2002-06-01592407414Dissecting the Opaque-2 regulatory network using transcriptome and proteome approaches along with enzyme activity measurementsAgnès Lefèvre0Luciano Consoli1Salete A. Gaziola2Ana Paula Pellegrino3Ricardo A. Azevedo4Catherine Damerval5URGV Unité de Recherche en Génomique VégétaleUPSUSPUSPUSPUPSThe Opaque-2 (O2) gene encodes a transcriptional activator specifically expressed for grain development of maize. o2 mutants have an opaque and chalky kernel, with a decrease in zein storage protein content, and an increase in the proportions of lysine and tryptophan. In this review, we present recent results investigating genetic properties of the O2 network, using transcriptome and proteome approaches, associated with measurements of activities of enzymes of the aspartate pathway and lysine degradation. The structural polymorphism at the O2 locus was investigated by RFLP in a collection of 51 maize inbred lines. Most polymorphic sites were found outside the coding regions. We then searched for relationships between RFLP polymorphism and (i) mRNA abundance of O2 and of known or suspected target genes, (ii) activity of SDH and (iii) amount of zein isoforms. Polymorphic restriction sites in the 5' upstream regions of the O2 gene were found associated with O2 mRNA abundance (three sites) and the amount of two 19 kDa alpha-zein isoforms (two sites). One restriction site on the 3' side of the O2 gene was found associated with Lor/Sdh mRNA abundance. Our results indicate relationships between polymorphism at the O2 locus and the expression of some of its target genes. Evidence of these associations has to be confirmed on larger samples, and the analysis of the O2 gene sequence should allow more precise testing of the actual involvement of O2 polymorphism in its own transcriptional expression, and in the expression of its target genes.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000200031&tlng=enzeinaspartate kinaselysine oxoglutarate reductase/saccharopine dehydrogenasepolymorphism |
| spellingShingle | Agnès Lefèvre Luciano Consoli Salete A. Gaziola Ana Paula Pellegrino Ricardo A. Azevedo Catherine Damerval Dissecting the Opaque-2 regulatory network using transcriptome and proteome approaches along with enzyme activity measurements Scientia Agricola zein aspartate kinase lysine oxoglutarate reductase/saccharopine dehydrogenase polymorphism |
| title | Dissecting the Opaque-2 regulatory network using transcriptome and proteome approaches along with enzyme activity measurements |
| title_full | Dissecting the Opaque-2 regulatory network using transcriptome and proteome approaches along with enzyme activity measurements |
| title_fullStr | Dissecting the Opaque-2 regulatory network using transcriptome and proteome approaches along with enzyme activity measurements |
| title_full_unstemmed | Dissecting the Opaque-2 regulatory network using transcriptome and proteome approaches along with enzyme activity measurements |
| title_short | Dissecting the Opaque-2 regulatory network using transcriptome and proteome approaches along with enzyme activity measurements |
| title_sort | dissecting the opaque 2 regulatory network using transcriptome and proteome approaches along with enzyme activity measurements |
| topic | zein aspartate kinase lysine oxoglutarate reductase/saccharopine dehydrogenase polymorphism |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000200031&tlng=en |
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