Transposable elements behavior following viral genomic stress inDrosophila melanogaster inbred line

1996 ◽  
Vol 43 (1) ◽  
pp. 19-27 ◽  
Author(s):  
Isabelle Jouan-Dufournel ◽  
François-Loïc Cosset ◽  
Didier Contamine ◽  
Gérard Verdier ◽  
Christian Biémont
Keyword(s):  
Transposable Elements ◽  
Inbred Line ◽  
Genomic Stress

scholarly journals Methylation, Transcription, and Rearrangements of Transposable Elements in Synthetic Allopolyploids

2011 ◽  
Vol 2011 ◽  
pp. 1-7 ◽  
Author(s):  
Beery Yaakov ◽  
Khalil Kashkush
Keyword(s):  
Transposable Elements ◽  
Transcriptional Activation ◽  
Genome Structure ◽  
Biological Significance ◽  
Wheat Genome ◽  
Wheat Species ◽  
Noncoding Sequences ◽  
Genomic Stress ◽  
Underlying Mechanisms ◽  
Allohexaploid Wheat

Transposable elements (TEs) constitute over 90% of the wheat genome. It was suggested that “genomic stress” such as hybridity or polyploidy might activate transposons. Intensive investigations of various polyploid systems revealed that allopolyploidization event is associated with widespread changes in genome structure, methylation, and expression involving low- and high-copy, coding and noncoding sequences. Massive demethylation and transcriptional activation of TEs were also observed in newly formed allopolyploids. Massive proliferation, however, was reported for very limited number of TE families in various polyploidy systems. The aim of this review is to summarize the accumulated data on genetic and epigenetic dynamics of TEs, particularly in synthetic allotetraploid and allohexaploid wheat species. In addition, the underlying mechanisms and the potential biological significance of TE dynamics following allopolyploidization are discussed.

scholarly journals THE Mu TRANSPOSABLE ELEMENTS OF MAIZE: EVIDENCE FOR TRANSPOSITION AND COPY NUMBER REGULATION DURING DEVELOPMENT

Genetics ◽  
1986 ◽  
Vol 112 (1) ◽  
pp. 107-119
Author(s):  
Mary Alleman ◽  
Michael Freeling
Keyword(s):  
Transposable Elements ◽  
Inbred Line ◽  
Germ Cells ◽  
Copy Number ◽  
First Generation ◽  
High Rate ◽  
Constant Number ◽  
Mutator Activity ◽  
Copy Number Regulation

ABSTRACT The Mu transposon of maize exists in a highly mutagenic strain called Robertson's Mutator. Plants of this strain contain 10-50 copies of the Mu element, whereas most maize strains and other plants have none. When Mutator plants are crossed to plants of the inbred line 1S2P, which does not have copies of Mu, the progeny plants have approximately the same number of Mu sequences as did their Mutator parent. Approximately one-half of these copies have segregated from their parent and one-half have arisen by transposition and are integrated into new positions in the genome. This maintenance of copy number can be accounted for by an extremely high rate of transposition of the Mu elements (10-15 transpositions per gamete per generation). When Mutator plants are self-pollinated, the progeny double their Mu copy number in the first generation, but maintain a constant number of Mu sequences with subsequent self-pollinations. Transposition of Mu and the events that lead to copy number maintenance occur very late in the development of the germ cells but before fertilization. A larger version of the Mu element transposes but is not necessary for transposition of the Mu sequences. The progeny of crosses with a Mutator plant occasionally lack Mutator activity; these strains retain copies of the Mu element, but these elements no longer transpose.

Survey of transposable elements from rice genomic sequences

2001 ◽  
Vol 25 (2) ◽  
pp. 169-179 ◽  
Author(s):  
Kime Turcotte ◽  
Sujatha Srinivasan ◽  
Thomas Bureau
Keyword(s):  
Transposable Elements ◽  
Genomic Sequences
Sign in / Sign up

Export Citation Format

Share Document