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Table 2 Distribution of TEs by genomic compartment. Using the Release 3.2 annotation, the 116.8 Mbp D. melanogaster genome sequence was partitioned into exonic, intronic and intergenic DNA with exons taking precedence over introns, and introns over intergenic regions for genes with alternative splicing or promoter usage. χ 2 values (degrees of freedom) are for tests of the number of TE insertions observed relative to expected proportions based on the total length of corresponding genomic compartment. P-values of all χ 2 tests were <1 × 10-15.

From: Paucity of chimeric gene-transposable element transcripts in the Drosophila melanogaster genome

  Transcribed Exon Intron Intergenic Total χ 2
Mbp 65.9 28.2 37.7 50.9 116.8 n.a.
observed # TEs 473 59 414 1093 1566 n.a.
expected (overall) - 377.86 505.20 682.94 1566 531.7 (2 df)
expected (transcribed vs. intergenic) 883.22 - - 682.78 1566 437.0 (1 df)
expected (exon vs. intron) - 202.44 270.56 - 473 177.7 (1 df)
expected (intron vs. intergenic) - - 640.48 866.53 1507 139.3 (1 df)