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Stowaway is a superfamily of miniature inverted repeat transposable elements (MITEs) that is widespread and abundant in plant genomes. Like other MITEs, however, its origin and mode of amplification are poorly understood. Several lines of evidence point to plant mariner-like elements (MLEs) as the autonomous partners of the nonautonomous Stowaway MITEs. To better understand this relationship, we have taken advantage of the nearly complete genome sequences of two rice subspecies to generate the first inventory of virtually all MLEs and Stowaway families coexisting in a single plant species. Thirty-four different MLEs were found to group into three major clades and 25 families. More than 22,000 Stowaway MITEs were identified and classified into 36 families. On the basis of detailed sequence comparisons, MLEs were confirmed to be the best candidate autonomous elements for Stowaway MITEs. Surprisingly, however, sequence similarity between MLE and Stowaway families was restricted to the terminal inverted repeats (TIRs) and, in a few cases, to adjacent subterminal sequences. These data suggest a model whereby most of the Stowaway MITEs in rice were cross-mobilized by MLE transposases encoded by distantly related elements.

genetics

Genome-Wide Analysis of <i>mariner</i>-Like Transposable Elements in Rice Reveals Complex Relationships With <i>Stowaway</i> Miniature Inverted Repeat Transposable Elements (MITEs)

Genome-Wide Analysis of mariner-Like Transposable Elements in Rice Reveals Complex Relationships With Stowaway Miniature Inverted Repeat Transposable Elements (MITEs)