Diverse retrotransposon families and an AT-rich satellite DNA revealed in giant genomes of Fritillaria lilies
| Authors | |
|---|---|
| Year of publication | 2011 |
| Type | Article in Periodical |
| Magazine / Source | Annals of Botany |
| MU Faculty or unit | |
| 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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