Table 1

TE effect on the human transcriptome

RE
Total
Intronic
TE in introns of UCSC annotated genesa
TE in introns of non-annotated genesa
TE exonization in UCSC annotated genesa
TE exonization in non-annotated genesa

Alu
1,094,409
718,460 (66%)
480,052
238,408
1060 (0.2%)
584 (0.2%)
MIR
537,730
351,366 (65%)
231,893
119,473
181 (0.08%)
134 (0.1%)
L1
830,062
486,901 (58%)
282,146
204,755
219 (0.08%)
250 (0.1%)
L2
375,116
240,350 (64%)
154,309
86,041
103 (0.07%)
72 (0.08%)
CR1
50,156
33,365 (66%)
22,087
11,278
12 (0.04%)
6 (0.05%)
LTR
654,897
292,456 (44%)
136,461
155,995
155 (0.1%)
150 (0.09%)
DNA
389,688
226489 (58%)
145,968
80,521
93 (0.06%)
142 (0.17%)

Total
3,932,058
2,349,387 (60%)
1,452,916
896,471
1824 (0.12%)
1653 (0.18%)

Insertions of transposed elements (TEs) within the human genome. The different classes of the examined TEs are shown in the left column. 'Total' (second column) indicates the overall amount of each TE within the human and mouse genomes. 'Intronic' (third column) indicates the number of TEs within intronic regions, and the percentage of TEs within introns relative to the total amount of TEs is shown in parentheses brackets. The fourth and fifth columns show the number of TEs within introns of the University of California, Santa Cruz (UCSC) knownGene list (version hg17) and those inserted within genes not listed within UCSC knownGene list. The sixth and seventh columns show the number of exonized TEs within the UCSC knownGene list and those exonized within genes not listed within UCSC knownGene list. In parentheses are indicated the percentage of exonized TEs is indicated. The lower row shows the total number of all TEs. aGene annotation is based on the annotations of the known gene list in the UCSC genome browser (version hg17). LTR, long terminal repeat; MIR, mammalian interspersed repeat; RE, retroelement.

Sela et al. Genome Biology 2007 8:R127   doi:10.1186/gb-2007-8-6-r127