A lack of active transposition would limit expansion of the elements in the genome.
These Ac observations could be consistent either with a lack of recent transposition or particularly strong selection targeting new insertions.
However, patterns of diversity in A. thaliana Ac elements differed significantly from that other TEs, perhaps signaling a lack of recent transposition.
For each mutant, seeds showing no MuDr activity (lack of somatic transposition indicated by the bz1-mum9 marker gene) were selfed to produce an F2 mutant segregating family.
Theoretical studies propose that a lack of regulation in transposition activities may contribute to a successful invasion of ISs in a sexual diploid population [ 51].
In contrast to the lack of intact Impalas for mimp transposition, Fol4287 possesses around 64 intact Fot5 transposase ORFs that could mobilize mFot5s [ 41].
Uncontrollable transposition behaviors, lack of target site specificity, preferred insertions into vital genes or regulatory regions can limit the host compatibility of some ISs for which a viable equilibrium can be found only in rare 'IS – host' combinations.
To determine if a pseudogene could arose from a retro-transposition event, we systematically checked for classical retro-transposition hallmarks: lack of intron with respect to their paralog CDS, retrotransposon-related sequences within the first flanking annotated elements of the pseudogene (one upstream and one downstream), and polyA-tail at the 3'-end of the pseudogene.
Definitive evidence supporting the occurrence of transposition in the plastid genome is lacking.
In contrast, sequence reads derived from insertion sites identified in normal tissues following two weeks of transposition were more evenly distributed, indicating a lack of significant selection for cells harboring any given insertion.
