NDLI: Distribution dynamics of the Tnt1 retrotransposon in tobacco

Content Provider	Springer Nature Link
Author	Le, Quang Hien Melayah, Delphine Bonnivard, Eric Petit, Maud Grandbastien, Marie Angèle
Copyright Year	2007
Abstract	Retrotransposons contribute significantly to the size, organization and genetic diversity of plant genomes. Although many retrotransposon families have been reported in plants, to this day, the tobacco Tnt1 retrotransposon remains one of the few elements for which active transposition has been shown. Demonstration that Tnt1 activation can be induced by stress has lent support to the hypothesis that, under adverse conditions, transposition can be an important source of genetic variability. Here, we compared the insertion site preference of a collection of newly transposed and pre-existing Tnt1 copies identified in plants regenerated from protoplasts or tissue culture. We find that newly transposed Tnt1 copies are targeted within or close to host gene coding sequences and that the distribution of pre-existing insertions does not vary significantly from this trend. Therefore, in spite of their potential to disrupt neighboring genes, insertions within or near CDS are not preferentially removed with age. Elimination of Tnt1 insertions within or near coding sequences may be relaxed due to the polyploid nature of the tobacco genome. Tnt1 insertions within or near CDS are thus better tolerated and can putatively contribute to the diversification of tobacco gene function.
Starting Page	639
Ending Page	651
Page Count	13
File Format	PDF
ISSN	16174615
Journal	Molecular and General Genetics MGG
Volume Number	278
Issue Number	6
e-ISSN	16174623
Language	English
Publisher	Springer-Verlag
Publisher Date	2007-09-01
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	LTR-retrotransposon Nicotiana tabacum Target site Stress Evolution Animal Genetics and Genomics Plant Genetics & Genomics Microbial Genetics and Genomics Biochemistry Cell Biology
Content Type	Text
Resource Type	Article
Subject	Genetics Medicine Molecular Biology

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