However, successful transfer to genomic "hot spots" and subsequent mobility to more stable genomic positions through mobile elements such as insertion sequences cannot be disproved.
Weathering processes in the soils are characterised by loss of Ca, Sr and several trace elements, and accumulation of less mobile elements such as Zr, Ti, and Al.
Mobile elements such as Alu repeats have substantially altered the architecture of the human genome, and de novo mobile element insertions sometimes cause genetic disorders.
Calculation of absolute mass flux values showed that, for some profiles, concentration of mobile elements such as Na and K by evapotranspiration was potentially important, despite evidence for clay eluviation in most profiles.
The RODs encode virulence determinants, metabolic proteins, proteins with no obvious functions and mobile elements such as prophage and a conjugative transposon.
However, as these genes are located on mobile elements such as phages or plasmids, it may be that these "strains" are in fact polyphyletic clusters.
Available data suggest that they are segmental duplications, distinct from high copy mobile elements such as SINEs, LINEs and other TEs.
Some of these are present on discrete mobile elements such as plasmids, prophages, and transposons [14], [41], [42], whereas others are themselves similar to transposons in terms of organization [13].
Insertions and rearrangements can also arise by the action of transposons [8] and the action of other mobile elements such as introns [18], inteins [19] and those coding for homing endonucleases [20], all of which are observed.
Interestingly, several mobile elements such as λ, CTnBST, CTnDOT, NBU1 also have 7 bp between the cleavage sites within inverted repeat sequences in their respective attP sites [20], [25], [33], [34].
Other mobile elements such as the SRL PAI of Shigella flexneri, the clc element of Pseudomonas sp. strain B13, and the SXT element of V. cholerae share with SGI1 very similar properties of integration [3], [22], [26] [28].
