Document Detail

Contrasting patterns of transposable-element insertion polymorphism and nucleotide diversity in autotetraploid and allotetraploid Arabidopsis species.
MedLine Citation:
PMID:  18493073     Owner:  NLM     Status:  MEDLINE    
It has been hypothesized that polyploidy permits the proliferation of transposable elements, due to both the masking of deleterious recessive mutations and the breakdown of host silencing mechanisms. We investigated the patterns of insertion polymorphism of an Ac-like transposable element and nucleotide diversity at 18 gene fragments in the allotetraploid Arabidopsis suecica and the autotetraploid A. arenosa. All identified insertions were fixed in A. suecica, and many were clearly inherited from the parental species A. thaliana or A. arenosa. These results are inconsistent with a rapid increase in transposition associated with hybrid breakdown but support the evidence from nucleotide polymorphism patterns of a recent single origin of this species leading to genomewide fixations of transposable elements. In contrast, most insertions were segregating at very low frequencies in A. arenosa samples, showing a significant departure from neutrality in favor of purifying selection, even when we account for population subdivision inferred from sequence variation. Patterns of nucleotide variation at reference genes are consistent with the TE results, showing evidence for higher effective population sizes in A. arenosa than in related diploid taxa but a near complete population bottleneck associated with the origins of A. suecica.
Khaled M Hazzouri; Arezou Mohajer; Steven I Dejak; Sarah P Otto; Stephen I Wright
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Genetics     Volume:  179     ISSN:  0016-6731     ISO Abbreviation:  Genetics     Publication Date:  2008 May 
Date Detail:
Created Date:  2008-05-21     Completed Date:  2008-09-22     Revised Date:  2013-06-05    
Medline Journal Info:
Nlm Unique ID:  0374636     Medline TA:  Genetics     Country:  United States    
Other Details:
Languages:  eng     Pagination:  581-92     Citation Subset:  IM    
Department of Biology, York University, Toronto, Ontario M3J 1P3, Canada.
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MeSH Terms
Arabidopsis / genetics*
Base Sequence
DNA Primers / genetics
DNA Transposable Elements / genetics*
Genetic Variation*
Genetics, Population*
Likelihood Functions
Models, Genetic
Molecular Sequence Data
Sequence Analysis, DNA
Reg. No./Substance:
0/DNA Primers; 0/DNA Transposable Elements

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