Figure 5

Exon assemblage and exonisation of TE sequences into the 5'-UTRs of the T1 and T2 transcripts. (A) A chromosomal map of discerned exons of T1 and T2 transcripts derived by bioinformatics-based alignment of the transcript and the genomic sequences. The relative map positions of the exons are in a linear order in the defined regional sequence of the Rn2_2148 supercontig. The new exon designations used are as defined in Table 1. Exons that are derived from TE sequences are asterisked with the exon designations shown below the exon map; exons of unique sequences are shown above the map. The T1 and T2 coding exons are shown in parenthesis. The scheme is prepared only to an approximate scale. (B) Embedment of T1 and T2 exons in a dense field of TE sequences. The nt 15,800,000–15,000,000 (15.8 Mb-15.0 Mb) chromosomal segment of the Rn2_2148 supercontig that harbours all the discerned T1 and T2 exons, the L1 (shown in blue) and the ERV sequences (in purple) are shown. The exons (see Table 1) are mapped below the TE sequences using the same colour code as in Figures 2 and 5A above. Coding exons are denoted by hatched bars and the boxed-in exon designations. Roofed segments (I) and (II) are shown in further details in (C). (C) Expanded views of the roofed segments of the T2 and T1 aligning exons displayed in (B) above. The respective TE and coding sequences are shown.