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Table 5 Relationship between mutations detected and relative expression levels of agr locus

From: Sub-inhibitory concentrations of oxacillin modify the expression of agr locus in Staphylococcus aureus clinical strains belonging to different clonal complexes

   

RNAIII

 

agrA

 

Mutations

Strains

CC a

Absence vs Presence b

Means±SD

P c

Absence vs Presence

Means±SD

P

42Val > Gly

SA_123; SA_520; SA_170015; SA_190006; SA_70002

45; 8

8.11 ± 14.27 vs. 40.22 ± 51.37

0.001

0.76 ± 0.53 vs. 5.26 ± 3.46

0.000

251Tyr > Phe

SA_123; SA_520; SA_170015

45

19.58 ± 39.28 vs. 16.90 ± 9.73

0.597

1.92 ± 3.16 vs. 3.51 ± 1.22

0.035

417Glu > Lys

SA_123

45

19.88 ± 36.58 vs. 8.66 ± 3.83

0.422

2.03 ± 2.96 vs. 4.57 ± 1.04

0.019

103I > T

SA_170015

45

18.49 ± 36.39 vs. 27.16 ± 8.56

0.563

2.21 ± 3.03 vs. 2.94 ± 0.74

0.556

138Lys/del-1 bp)

SA_180015

8

20.56 ± 36.30 vs. 0.22 ± 0.05

0.000

2.40 ± 2.99 vs. 0.26 ± 0.89

0.000

262Asp > Ala

SA_190006; SA_70002

8

10.17 ± 13.81 vs. 74.29 ± 67.51

0.005

1.42 ± 1.40 vs. 8.27 ± 4.01

0.000

258Phe > Ile

SA_190006; SA_70002

8

10.17 ± 13.81 vs. 74.29 ± 67.51

0.005

1.42 ± 1.40 vs. 8.27 ± 4.01

0.000

138Phe/del-1 bp)

SA_80004

5

20.80 ± 36.44 vs. 0.14 ± 0.04

0.000

2.41 ± 2.41 vs. 0.16 ± 0.85

0.000

96Ser > Leu

SA_103

5

20.47 ± 36.35 vs.1.29 ± 0.56

0.000

2.42 ± 3.02 vs 0.56 ± 0.27

0.000

121I > T

SA_170006

5

20.53 ± 36.31 vs. 0.51 ± 0.24

0.000

2.42 ± 3.00 vs 0.36 ± 0.75

0.000

136Lys > Arg

SA_10009; SA_10014

15

17.91 ± 37.60 vs. 25.01 ± 19.04

0.478

2.49 ± 3.16 vs 1.08 ± 0.32

0.000

55Gly > Arg

SA_80001; SA_107

30

20.86 ± 37.41 vs. 6.59 ± 6.82

0.002

2.40 ± 3.12 vs 1.33 ± 0.52

0.007

  1. a Clonal Complex
  2. b Values of expression are showed as relative means ± standard deviation (SD) according to the presence and absence of mutation detected relative to the agr group reference strains
  3. c Bold numbers indicate statistical significant results (P < 0.05)