חיפוש מתקדם
תחביר
חפש...
הספר "אוצר וולקני"
אודות
תנאי שימוש
ניהול
קהילה:
אסיף מאגר המחקר החקלאי
פותח על ידי קלירמאש פתרונות בע"מ -
Identification of trans-acting siRNAs in moss and an RNA-dependent RNA polymerase required for their biogenesis
Year:
2006
Source of publication :
Plant Journal
Authors :
ארזי, צחי
;
.
טלמור-ניימן, מלי
;
.
סתו, רן
;
.
Volume :
48
Co-Authors:
Talmor-Neiman, M., Department of Ornamental Horticulture, Agricultural Research Organization, Volcani Center, PO Box 6, Bet Dagan 50250, Israel
Stav, R., Department of Ornamental Horticulture, Agricultural Research Organization, Volcani Center, PO Box 6, Bet Dagan 50250, Israel
Klipcan, L., Department of Ornamental Horticulture, Agricultural Research Organization, Volcani Center, PO Box 6, Bet Dagan 50250, Israel
Buxdorf, K., Department of Ornamental Horticulture, Agricultural Research Organization, Volcani Center, PO Box 6, Bet Dagan 50250, Israel
Baulcombe, D.C., Sainsbury Laboratory, Colney Lane, Norwich NR4 7UH, United Kingdom
Arazi, T., Department of Ornamental Horticulture, Agricultural Research Organization, Volcani Center, PO Box 6, Bet Dagan 50250, Israel
Facilitators :
From page:
511
To page:
521
(
Total pages:
11
)
Abstract:
Trans-acting small interfering RNAs (tasiRNAs) are a class of higher-plant endogenous siRNAs that, like miRNAs, direct the cleavage of non-identical transcripts. tasiRNAs derive from non-coding transcripts (TAS) that are converted into dsRNA by a RNA-dependent RNA polymerase (RDR6), following their initial miRNA-guided cleavage. The dsRNA is then processed by a dicer-like enzyme 4 into phased 21-nucleotide siRNAs. To date, tasiRNAs have been identified only in Arabidopsis, and their identity and function in other land plants are unknown. Here, a set of endogenous small RNAs that correspond in a phased manner to a non-coding transcript (contig13502) were identified in the moss Pyscomitrella patens. Northern analysis suggests that contig13502-derived small RNAs are expressed in the juvenile gametophyte. In addition, miR390-guided cleavage of contig13502 at two sites flanking the small RNAs cluster was validated by 5′ RACE. These cleavages are predicted to provide defined termini for the production of phased siRNAs. To elucidate the biogenesis of identified siRNAs, we cloned and generated knock-out mutants for an RDR6 moss homologue (PpRDR6). These mutants exhibited an accelerated transition from juvenile to mature gametophyte. In addition, RNA blots demonstrated that they lacked contig13502-derived siRNAs, suggesting that PpRDR6 is required for siRNA biogenesis. A target gene, which showed homology to an AP2/EREBP transcription factor, for one phased siRNA, was validated, corroborating its identity as a trans-acting siRNA. Taken together, our data indicate that contig13502 is a novel TAS locus and suggest a role for derived tasiRNAs in the regulation of gene expression in moss. © 2006 The Authors.
Note:
Related Files :
arabidopsis
Base Sequence
enzymes
Genetics
metabolism
molecular genetics
moss
Nucleic acids
RNA
עוד תגיות
תוכן קשור
More details
DOI :
10.1111/j.1365-313X.2006.02895.x
Article number:
Affiliations:
Database:
סקופוס
Publication Type:
מאמר
;
.
Language:
אנגלית
Editors' remarks:
ID:
23088
Last updated date:
02/03/2022 17:27
Creation date:
16/04/2018 23:56
Scientific Publication
Identification of trans-acting siRNAs in moss and an RNA-dependent RNA polymerase required for their biogenesis
48
Talmor-Neiman, M., Department of Ornamental Horticulture, Agricultural Research Organization, Volcani Center, PO Box 6, Bet Dagan 50250, Israel
Stav, R., Department of Ornamental Horticulture, Agricultural Research Organization, Volcani Center, PO Box 6, Bet Dagan 50250, Israel
Klipcan, L., Department of Ornamental Horticulture, Agricultural Research Organization, Volcani Center, PO Box 6, Bet Dagan 50250, Israel
Buxdorf, K., Department of Ornamental Horticulture, Agricultural Research Organization, Volcani Center, PO Box 6, Bet Dagan 50250, Israel
Baulcombe, D.C., Sainsbury Laboratory, Colney Lane, Norwich NR4 7UH, United Kingdom
Arazi, T., Department of Ornamental Horticulture, Agricultural Research Organization, Volcani Center, PO Box 6, Bet Dagan 50250, Israel
Identification of trans-acting siRNAs in moss and an RNA-dependent RNA polymerase required for their biogenesis
Trans-acting small interfering RNAs (tasiRNAs) are a class of higher-plant endogenous siRNAs that, like miRNAs, direct the cleavage of non-identical transcripts. tasiRNAs derive from non-coding transcripts (TAS) that are converted into dsRNA by a RNA-dependent RNA polymerase (RDR6), following their initial miRNA-guided cleavage. The dsRNA is then processed by a dicer-like enzyme 4 into phased 21-nucleotide siRNAs. To date, tasiRNAs have been identified only in Arabidopsis, and their identity and function in other land plants are unknown. Here, a set of endogenous small RNAs that correspond in a phased manner to a non-coding transcript (contig13502) were identified in the moss Pyscomitrella patens. Northern analysis suggests that contig13502-derived small RNAs are expressed in the juvenile gametophyte. In addition, miR390-guided cleavage of contig13502 at two sites flanking the small RNAs cluster was validated by 5′ RACE. These cleavages are predicted to provide defined termini for the production of phased siRNAs. To elucidate the biogenesis of identified siRNAs, we cloned and generated knock-out mutants for an RDR6 moss homologue (PpRDR6). These mutants exhibited an accelerated transition from juvenile to mature gametophyte. In addition, RNA blots demonstrated that they lacked contig13502-derived siRNAs, suggesting that PpRDR6 is required for siRNA biogenesis. A target gene, which showed homology to an AP2/EREBP transcription factor, for one phased siRNA, was validated, corroborating its identity as a trans-acting siRNA. Taken together, our data indicate that contig13502 is a novel TAS locus and suggest a role for derived tasiRNAs in the regulation of gene expression in moss. © 2006 The Authors.
Scientific Publication
נגישות
menu      
You may also be interested in