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Tissue-specific expression conferred by the S-adenosyl-L-methionine synthetase promoter of Arabidopsis thaliana in transgenic poplar.

Identifieur interne : 004A26 ( Main/Exploration ); précédent : 004A25; suivant : 004A27

Tissue-specific expression conferred by the S-adenosyl-L-methionine synthetase promoter of Arabidopsis thaliana in transgenic poplar.

Auteurs : K. Vander Mijnsbrugge [Belgique] ; M. Van Montagu ; D. Inzé ; W. Boerjan

Source :

RBID : pubmed:9032966

Descripteurs français

English descriptors

Abstract

In Arabidopsis the promoter of the gene encoding S-adenosyl-L-methionine synthetase (SAM-S) Psam-1 confers expression preferentially in the vascular tissue. In search for promoters that drive expression in particular cells of the lignifying tissues in trees, we have analyzed the expression pattern conferred by the Psam-1 promoter in transgenic poplar. Histochemical analyses demonstrated beta-glucuronidase (GUS) activity mainly in phloem and cortex tissue throughout the plant, and in root tips. Fluorimetric assays showed high GUS activity in the tissues outside (phloem, cortex and cork) compared to those inside (xylem and pith) of the cambial layer. In contrast, the endogenous SAM-S activity was high in tissues inside and low in tissues outside of the cambial layer. RNA gel blot analysis demonstrated a high transcript level of the endogenous sam-s gene(s) in tissues both outside and inside the cambial layer. This indicates that the low SAM-S activity in the bark was at least partially due to translational and/or post-translational regulation of the endogenous sam-s gene(s). In dormant transgenics, the tissue specificity was conserved, but the activity levels were up to 10-fold reduced.

DOI: 10.1093/oxfordjournals.pcp.a029061
PubMed: 9032966


Affiliations:


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Le document en format XML

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<title xml:lang="en">Tissue-specific expression conferred by the S-adenosyl-L-methionine synthetase promoter of Arabidopsis thaliana in transgenic poplar.</title>
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<name sortKey="Vander Mijnsbrugge, K" sort="Vander Mijnsbrugge, K" uniqKey="Vander Mijnsbrugge K" first="K" last="Vander Mijnsbrugge">K. Vander Mijnsbrugge</name>
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<nlm:affiliation>Department of Genetics, Flanders Interuniversity Institute for Biotechnology, Universiteit Gent, Belgium.</nlm:affiliation>
<country xml:lang="fr">Belgique</country>
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<term>Arabidopsis (enzymology)</term>
<term>Arabidopsis (genetics)</term>
<term>Gene Expression (MeSH)</term>
<term>Glucuronidase (metabolism)</term>
<term>Methionine Adenosyltransferase (genetics)</term>
<term>Methionine Adenosyltransferase (metabolism)</term>
<term>Plant Proteins (genetics)</term>
<term>Plants, Genetically Modified (MeSH)</term>
<term>Promoter Regions, Genetic (MeSH)</term>
<term>Protein Biosynthesis (MeSH)</term>
<term>RNA Processing, Post-Transcriptional (MeSH)</term>
<term>Recombinant Fusion Proteins (genetics)</term>
<term>S-Adenosylmethionine (metabolism)</term>
<term>Time Factors (MeSH)</term>
<term>Transformation, Genetic (MeSH)</term>
<term>Trees (MeSH)</term>
</keywords>
<keywords scheme="KwdFr" xml:lang="fr">
<term>Adémétionine (métabolisme)</term>
<term>Arabidopsis (enzymologie)</term>
<term>Arabidopsis (génétique)</term>
<term>Arbres (MeSH)</term>
<term>Biosynthèse des protéines (MeSH)</term>
<term>Expression des gènes (MeSH)</term>
<term>Facteurs temps (MeSH)</term>
<term>Glucuronidase (métabolisme)</term>
<term>Maturation post-transcriptionnelle des ARN (MeSH)</term>
<term>Methionine adenosyltransferase (génétique)</term>
<term>Methionine adenosyltransferase (métabolisme)</term>
<term>Protéines de fusion recombinantes (génétique)</term>
<term>Protéines végétales (génétique)</term>
<term>Régions promotrices (génétique) (MeSH)</term>
<term>Transformation génétique (MeSH)</term>
<term>Végétaux génétiquement modifiés (MeSH)</term>
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<term>Methionine Adenosyltransferase</term>
<term>Plant Proteins</term>
<term>Recombinant Fusion Proteins</term>
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<keywords scheme="MESH" type="chemical" qualifier="metabolism" xml:lang="en">
<term>Glucuronidase</term>
<term>Methionine Adenosyltransferase</term>
<term>S-Adenosylmethionine</term>
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<term>Arabidopsis</term>
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<term>Arabidopsis</term>
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<term>Arabidopsis</term>
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<term>Arabidopsis</term>
<term>Methionine adenosyltransferase</term>
<term>Protéines de fusion recombinantes</term>
<term>Protéines végétales</term>
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<keywords scheme="MESH" qualifier="métabolisme" xml:lang="fr">
<term>Adémétionine</term>
<term>Glucuronidase</term>
<term>Methionine adenosyltransferase</term>
</keywords>
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<term>Gene Expression</term>
<term>Plants, Genetically Modified</term>
<term>Promoter Regions, Genetic</term>
<term>Protein Biosynthesis</term>
<term>RNA Processing, Post-Transcriptional</term>
<term>Time Factors</term>
<term>Transformation, Genetic</term>
<term>Trees</term>
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<term>Biosynthèse des protéines</term>
<term>Expression des gènes</term>
<term>Facteurs temps</term>
<term>Maturation post-transcriptionnelle des ARN</term>
<term>Régions promotrices (génétique)</term>
<term>Transformation génétique</term>
<term>Végétaux génétiquement modifiés</term>
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<div type="abstract" xml:lang="en">In Arabidopsis the promoter of the gene encoding S-adenosyl-L-methionine synthetase (SAM-S) Psam-1 confers expression preferentially in the vascular tissue. In search for promoters that drive expression in particular cells of the lignifying tissues in trees, we have analyzed the expression pattern conferred by the Psam-1 promoter in transgenic poplar. Histochemical analyses demonstrated beta-glucuronidase (GUS) activity mainly in phloem and cortex tissue throughout the plant, and in root tips. Fluorimetric assays showed high GUS activity in the tissues outside (phloem, cortex and cork) compared to those inside (xylem and pith) of the cambial layer. In contrast, the endogenous SAM-S activity was high in tissues inside and low in tissues outside of the cambial layer. RNA gel blot analysis demonstrated a high transcript level of the endogenous sam-s gene(s) in tissues both outside and inside the cambial layer. This indicates that the low SAM-S activity in the bark was at least partially due to translational and/or post-translational regulation of the endogenous sam-s gene(s). In dormant transgenics, the tissue specificity was conserved, but the activity levels were up to 10-fold reduced.</div>
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<AbstractText>In Arabidopsis the promoter of the gene encoding S-adenosyl-L-methionine synthetase (SAM-S) Psam-1 confers expression preferentially in the vascular tissue. In search for promoters that drive expression in particular cells of the lignifying tissues in trees, we have analyzed the expression pattern conferred by the Psam-1 promoter in transgenic poplar. Histochemical analyses demonstrated beta-glucuronidase (GUS) activity mainly in phloem and cortex tissue throughout the plant, and in root tips. Fluorimetric assays showed high GUS activity in the tissues outside (phloem, cortex and cork) compared to those inside (xylem and pith) of the cambial layer. In contrast, the endogenous SAM-S activity was high in tissues inside and low in tissues outside of the cambial layer. RNA gel blot analysis demonstrated a high transcript level of the endogenous sam-s gene(s) in tissues both outside and inside the cambial layer. This indicates that the low SAM-S activity in the bark was at least partially due to translational and/or post-translational regulation of the endogenous sam-s gene(s). In dormant transgenics, the tissue specificity was conserved, but the activity levels were up to 10-fold reduced.</AbstractText>
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