Table 6.
The effects of exonization on mouse protein coding regions
| RE | Alt. CDS | CDS | UTR | Stop | Frameshift | Functional |
| B1 | 4 (3%) | 87 (65%) | 43 (32%) | 67 (77%) | 13 (15%) | 7 (8%) |
| MIR | 3 (11%) | 9 (33%) | 15 (56%) | 5 (55%) | 0 (0%) | 4 (45%) |
| B2 | 4 (5%) | 37 (46%) | 40 (49%) | 29 (78%) | 3 (8%) | 5 (14%) |
| B4 | 3 (5%) | 39 (63%) | 20 (32%) | 30 (77%) | 5 (13%) | 4 (10%) |
| L1 | 3 (3%) | 54 (53%) | 45 (44%) | 38 (70%) | 6 (11%) | 10 (19%) |
| L2 | 0 (0%) | 3 (33%) | 6 (66%) | 1 (33%) | 1 (33%) | 1 (33%) |
| LTR | 3 (4%) | 38 (53%) | 31 (43%) | 29 (76%) | 6 (16%) | 3 (8%) |
| DNA | 1 (1%) | 4 (36%) | 6 (67%) | 3 (75%) | 0 (0%) | 1 (25%) |
The first column shows the different examined transposed elements (TEs). Columns 2, 3, and 4 show the positions of TE exonization within the mRNA: creating an alternative coding sequence (CDS) start (Alt. CDS), exonization within the CDS, or exonization within the untranslated region (UTR). In parentheses, the relative percentages are given. Columns 5, 6, and 7 show the effect of exonization within the CDS: exonizations that contain an in-frame stop codon (within the exon); exonizations that create a frameshift in the CDS but do not contain an in-frame stop codon; and functional exonizations (exons that do not possess an in-frame stop codon and do not cause frameshifts). The relative percentages within CDS are indicated in parentheses. The total number of TEs (100%) is found at the foot of the second column of Table 2. LTR, long terminal repeat; MIR, mammalian interspersed repeat; RE, retroelement.