Diverse retrotransposon families and an AT-rich satellite DNA revealed in giant genomes of Fritillaria lilies

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Authors

AMBROŽOVÁ Kateřina MANDÁKOVÁ Terezie BUREŠ Petr NEUMANN Pavel LEITCH Ilia J. KOBLÍŽKOVÁ Andrea MACAS Jiří LYSÁK Martin

Year of publication 2011
Type Article in Periodical
Magazine / Source Annals of Botany
MU Faculty or unit

Central European Institute of Technology

Citation
Web http://aob.oxfordjournals.org/content/107/2/255.full.pdf+html
Doi http://dx.doi.org/10.1093/aob/mcq235
Field Botany
Keywords Liliaceae; repetitive DNA; transposable elements; retrotransposon; heterochromatin; satellite repeats; chromosomes; genome size variation
Description Repeats corresponding to 6.7 and 4.7% of the F. affinis and F. imperialis genome, respectively, were identified. Chromoviruses and the Tat lineage of Ty3/gypsy group long terminal repeat retrotransposons were identified as the predominant components of the highly repeated fractions in the F. affinis and F. imperialis genomes, respectively. In addition, a heterogeneous, extremely AT-rich satellite repeat was isolated from F. affinis. The FriSAT1 repeat localized in heterochromatic bands makes up approx. 26% of the F. affinis genome and substantial genomic fractions in several other Liliorhiza species. However, no evidence of a relationship between heterochromatin content and genome size variation was observed. Also, this study was unable to reveal any predominant repeats which tracked the increasing/decreasing trends of genome size evolution in Fritillaria. Instead, the giant Fritillaria genomes seem to be composed of many diversified families of transposable elements.
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