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Table 1 Distribution of 5' recombination junctions in vector mutants isolated in vitro and in vivo with respect to flanking nucleotide sequence homology and EMCV IRES secondary structure

From: Influence of vector design and host cell on the mechanism of recombination and emergence of mutant subpopulations of replicating retroviral vectors

 

in vitroa

in vivob

TOTAL

 

NIH-3T3

HEK293

U87-MG

TOTAL

  

within IRES

2

3

1

6

10

16

pairedc

1

0

0

1

7

8

unpairedd

1

3

1

5

3

8

≥ 4 nt repeate

0

0

0

0

0

0

outside IRES

3

5

2

10

5

15

≥ 4 nt repeat

2

4

1

7

3

10

TOTAL

5

8

3

16

15

31

  1. aDistribution of 5' recombination junctions in vector mutants isolated from in vitro infected NIH-3T3, HEK293, and U87-MG cells at the end of each cycle
  2. bDistribution of 5' recombination junctions in vector mutants isolated from pre-formed subcutaneous U87-MG tumours growing in nude mice and infected in vivo
  3. c5' recombination junctions which fall within paired regions of the EMCV IRES RNA secondary structure [44, 67]
  4. d5' recombination junctions which fall within unpaired regions of the EMCV IRES RNA secondary structure [44, 67]
  5. e5' recombination junctions which are flanked by nucleotide sequence homology (direct or inverted repeats) of = 4 nt in length