Table 1 Natural transformation frequencies for H. pylori strains.

From: Identification of the periplasmic DNA receptor for natural transformation of Helicobacter pylori

Genotype

Mean transformation frequencies

n

Relative value

P-value (MWU)

wild-type

1.60 × 10−3 (1.87 × 10−3)

27

1.00

 

ΔcomH

7.07 × 10−8 (1.26 × 10−7)

11

4.42 × 10−5

<.0001

ΔcomH rdxA::comH-FLAG

5.54 × 10−4 (4.93 × 10−4)

9

0.35

0.0356

ΔcomB2

6.68 × 10−9 (4.34 × 10−9)

4

4.17 × 10−6

<.0001

ΔcomEC

2.45 × 10−9 (4.90 × 10−9)

4

1.53 × 10−6

<.0001

ΔdprA

3.97 × 10−6 (1.69 × 10−6)

4

2.48 × 10−3

<.0001

ΔrecA

4.05 × 10−9 (2.32 × 10−9)

3

2.53 × 10−6

<.0005

  1. The recombination frequencies of the isogenic streptomycin resistant (StrepR) total genomic DNA were calculated as the number of streptomycin resistance colonies per recipient colony-forming unit. Values correspond to the mean and standard deviation. n No. of independent determinants. MWU Mann–Whitney U test.