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Table 1 Overview of dictyostelid retrotransposon properties and integration preferences

From: Convergent evolution of tRNA gene targeting preferences in compact genomes

Name

Consensus length (bp)

LTR length (bp)

Copy number in genome a

tRNA gene-specific

Distance to tRNA gene (bp)

total

full length b

solo LTR

5’ of tDNA

(%) c

3’ of tDNA

(%) c

LTR retrotransposons

Dd-Skipper-1

6998

390

60

2

10

no

Dp_Skipper-1

7485

388

12

1

6

no

Dl_Skipper-1

4763

251

7

2

2

no

Pp_Skipper-1

5589

226

14

1

10

yes

Df_Skipper-1

5120 d

n.d. e

5

0

n.d. e

no

Pf_Skipper-1.1

5296

259

6

1

0

no

Pf_Skipper-1.2

6983

382

3

0

1

no

Pf_Skipper-1.3

7081

363

7

1

6

no

Dd-Skipper-2 f

6178

208

8

0

0

no

8–23 (4)

Dp_Skipper-2

5676

315

23

3

5

yes

7–133 (5)

Pp_Skipper-2

3675 d

n.d. e

9

0

n.d. e

yes

54–136 (9)

Df_Skipper-2

5708

312

12

7

5

yes

26–97 (11)

Dd_DGLT-A

5054

265

20

0

5

yes

13–33 (18)

Dp_DGLT-A.1

5436

492

15

1

9

yes

13–16 (6)

Dp_DGLT-A.2

6114

389

9

2

5

yes

15 (1)

Dp_DGLT-A.3

5589

563

8

1

6

yes

10–11 (2)

Dp_DGLT-A.4 g

3447 d

206

30

0

20

yes

16–34 (4)

Dp_DGLT-A.5 g

3440 d

354

32

0

32

yes

10–19 (15)

Dl_DGLT-A.1

4895

163

10

1

4

yes

63–64 (4)

Dl_DGLT-A.2

5112

206

7

1

2

yes

55–65 (2)

Pp_DGLT-A.1

7295

601

23

1

13

no

Pp_DGLT-A.2

6160

393

12

2

6

no

Pp_DGLT-A.3

5942

212

11

2

3

no

Pp_DGLT-A.4 g

3650 d

n.d. e

10

0

n.d. e

yes

14–24 (3)

Pf_DGLT-A

8367

168

2

1

1

no

Non-LTR retrotransposons

Dd_TRE3-A

5229

67

13

yes

14–228 (60)

Dd_TRE3-B

5279

43

9

yes

34–188 (39)

Dd_TRE3-C

4734

29

2

yes

14–305 (29)

Dd_TRE3-D

1559 d

11

0

yes

49–285 (11)

Dp_TRE3-A

5150

56

2

yes

69–161 (18)

Dp_TRE3-B

5210

9

2

yes

98–154 (2)

Dp_TRE3-C

1620 d

37

0

yes

67–450 (15)

Dl_TRE3-A

4386

17

2

yes

23/87 (7)

Pp_TRE3-A

4515

35

4

yes

26–138 (10)

Pp_TRE3-B

4741

38

2

yes

57–151 (11)

Df_TRE3-A

1867 d

14

0

yes

29–404 (11)

Dd_TRE5-A

5647

102

5

yes

37–90 (98)

Dd_TRE5-B

5971

25

1

yes

34–82 (25)

Dd_TRE5-C

879 d

18

0

yes

38–95 (18)

Dl_TRE5-A h

7405

30

1

no

Pp_TRE5-A

1169 d

21

0

yes

38–74 (12)

Df_TRE5-A.1

2587 d

56

1

yes

45–88 (20)

Df_TRE5-A.2

1275 d

20

0

yes

31–98 (18)

Df_TRE5-A.3

2941 d

7

0

yes

39–67 (6)

Df_TRE5-B

1534 d

27

0

yes

44–90 (9)

Dp_NLTR-A

7438

28

1

yes

2–6 (16)

Pp_NLTR-B

5550 d

3

0

yes

39–64 (3)

Pp_NLTR-C

3536 d

12

1

no

  1. aTotal copy numbers refer to both full-length and partial sequences
  2. bFull-length copies with intact open reading frames
  3. cDistances are listed only for retrotransposons found in the direct neighborhood of tRNA genes; in cases where other tRNA gene-specific retrotransposons have integrated at the same tRNA gene and therefore upstream of a previously inserted element, distances of the original insertion to the target could not be determined. The number of elements used for determination of target distances are shown in parentheses
  4. dNo full-length consensus available
  5. eNo LTR sequences detectable
  6. fPrevious name DGLT-B (GenBank AF474004) [17]
  7. gNo ORFs for phylogenetic analysis; classification as DGLT-A according to integration preference
  8. hClassified as TRE5 by similarity of RT sequence (compare Fig. 5)