The retrotransposons and certain DNA-transposons, are "jumping" sequences which may be incorporated elsewhere in the genomic DNA of an organism, through varying mechanisms. This insertion is almost random in case of retrotransposons and most DNA-transposons, but some transposing enzymes show specificity in selection of insertion sites. In either case, the "copy-paste" mechanism of transposition is essentially a random process(considering the frequency and place of transposition) and therefore, the extent of transposition should vary among all individuals, and all cells of a single individual. My question is,
Is the extent of transposition random and varied among the different somatic cells of an individual or is there a regulatory mechanism which ensures that there is not much difference in the net content of DNA (caused by unequal transposition) by equalizing the extent of transposition in different individuals or different cells of the same individual? If not, does this unequal c-value in different cell cause any troubles?