Table 4.

Structural Variation and Size Reduction in LTR Retrotransposons

Families I—XI
Osr8 and Osr30
Structure
No. of elements
Remaining size (kb)
Estimated original size (kb)a
Loss of DNA (kb)
No. of elementsb
Remaining size (kb)
Estimated original size (kb)a
Loss of DNA (kb)
Primary mechanism
Solo LTRS 348 277 2852 2575 85 115 938 823 Intra-element unequal recombination
Solo LTRs without TSDs 42 37 635 598 9 16 212 196 Inter-element unequal recombination
Intact elements without TSDs 14 103 243 140 2 28 55 27 Inter-element unequal recombination
Truncated elements 358 745 3198 2453 87 272 1021 749 Illegitimate recombination
Intact elements 238 1829 2198 369 33 338 359 21 Illegitimate recombination
Total
1000
2991
9126
6135
216
769
2585
1816

a The original size of each element was estimated on the basis of the sizes of full-length and consensus elements identified in each family (Table 1)

b A subset of Osr8 and Osr30 were randomly chosen