Document Detail

An analysis of retroposition in plants based on a family of SINEs from Brassica napus.
MedLine Citation:
PMID:  7966368     Owner:  NLM     Status:  MEDLINE    
The identification of a family of SINE retroposons dispersed in the genome of oilseed rape Brassica napus has provided the basis for an evolutionary analysis of retroposition in plants. The repetitive elements (called S1Bn) are 170 bp long and occupy roughly 500 loci by haploid genome. They present characteristic features of SINE retroposons such as a 3' terminal A-rich region, two conserved polymerase III motifs (box A and B), flanking direct repeats of variable sizes, and a primary and secondary sequence homology to several tRNA species. A consensus sequence was made from the alignment of 34 members of the family. The retroposon population was divided into five subfamilies based on several correlated sets of mutations from the consensus. These precise separations in subfamilies based on "diagnostic" mutations and the random distribution of mutations observed inside each subfamily are consistent with the master sequence model proposed for the dispersion of mammalian retroposons. An independent analysis of each subfamily provides strong evidence for the coexpression of at least three subfamily master sequences (SMS). In contrast to mammalian retroposition, diagnostic positions are not shared between SMS. We therefore propose that SMS were all derived from a general master sequence (GMS) and independently activated for retroposition after a variable period of random drift. Possible models for plant retroposition are discussed.
J M Deragon; B S Landry; T Pélissier; S Tutois; S Tourmente; G Picard
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of molecular evolution     Volume:  39     ISSN:  0022-2844     ISO Abbreviation:  J. Mol. Evol.     Publication Date:  1994 Oct 
Date Detail:
Created Date:  1994-12-16     Completed Date:  1994-12-16     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0360051     Medline TA:  J Mol Evol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  378-86     Citation Subset:  IM    
GDR-977 Biomove CNRS, Université Blaise Pascal Clermont-Ferrand II, Aubière, France.
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MeSH Terms
Base Sequence
Brassica / genetics*
DNA, Plant / genetics
Models, Genetic
Molecular Sequence Data
Molecular Structure
Polymerase Chain Reaction
Repetitive Sequences, Nucleic Acid*
Sequence Alignment
Reg. No./Substance:
0/DNA, Plant; 0/Oligonucleotides; 0/Retroelements

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