Table 2 ddPCR and PNA–ddPCR results of 15 paired SWS patients.

From: Ultra–sensitive droplet digital PCR for detecting a low–prevalence somatic GNAQ mutation in Sturge–Weber syndrome

Sample

Sample type

Mut copy number

Mut drop

Wt drop

ACD

FA (%)

deep–seq

PNA-ddPCR

SWS1

brain

246.67 ( 9.29 )

138.33 ( 15.11 )

2188.00 ( 155.86 )

13208.33 ( 1009.30 )

5.50 ( 0.24 )

6.0

+

blood

7.80 ( 4.82 )

4.33 ( 2.87 )

2520.67 ( 88.51 )

12677.67 ( 740.68 )

0.15 ( 0.10 )

0.03

+new

SWS2

brain

80.67 ( 15.86 )

52.00 ( 8.60 )

1097.67 ( 13.47 )

15316.00 ( 839.64 )

4.37 ( 0.66 )

4.0

+

blood

8.87 ( 5.01 )

5.33 ( 3.09 )

4008.33 ( 2093.11 )

13836.00 ( 611.36 )

0.11 ( 0.06 )

0.05

+new

SWS3

brain

9.60 ( 3.37 )

4.67 ( 1.25 )

2876.67 ( 125.27 )

11946.33 ( 1546.93 )

0.14 ( 0.04 )

0.03

+new

blood

1.53 ( 1.23 )

1.00 ( 0.82 )

3066.33 ( 166.55 )

14435.33 ( 873.95 )

0.04 ( 0.02 )

0.03

SWS4

brain

11.33 ( 5.56 )

6.67 ( 3.86 )

2894.67 ( 128.23 )

13326.00 ( 1169.36 )

0.20 ( 0.11 )

0.16

+new

blood

2.87 ( 2.29 )

2.00 ( 1.63 )

2356.33 ( 450.70 )

14885.67 ( 1623.49 )

0.11 ( 0.02 )

0.03

SWS5

brain

222.67 ( 17.00 )

148.00 ( 15.12 )

2979.67 ( 215.29 )

15683.33 ( 423.06 )

4.33 ( 0.53 )

5.0

NP

blood

4.73 ( 2.46 )

3.00 ( 1.63 )

5104.00 ( 1862.52 )

14706.33 ( 645.52 )

0.05 ( 0.04 )

0.04

SWS6

brain

331.33 ( 10.50 )

207.67 ( 4.03 )

2772.33 ( 121.38 )

14858.67 ( 354.37 )

6.40 ( 0.22 )

6.0

NP

blood

3.60 ( 1.88 )

2.33 ( 1.25 )

3423.67 ( 513.43 )

15444.00 ( 1326.28 )

0.06 ( 0.03 )

0.04

SWS7

brain

177.33 ( 16.76 )

111.33 ( 13.89 )

2674.33 ( 173.12 )

14798.67 ( 634.96 )

3.63 ( 0.33 )

4.0

NP

blood

1.60 ( 1.40 )

1.00 ( 0.82 )

4894.00 ( 2358.55 )

15173.67 ( 1153.39 )

0.03 ( 0.02 )

0.04

SWS8

brain

295.33 ( 8.22 )

181.00 ( 7.12 )

2616.33 ( 124.93 )

14501.33 ( 320.86 )

5.97 ( 0.12 )

6.0

+

saliva

51.33 ( 5.25 )

35.33 ( 4.78 )

4856.33 ( 533.45 )

16400.33 ( 1350.59 )

0.61 ( 0.06 )

0.44

+

SWS9

brain

346.00 ( 17.05 )

178.00 ( 7.26 )

2339.00 ( 69.37 )

12196.67 ( 828.45 )

6.47 ( 0.09 )

8.0

NP

blood

1.07 ( 0.75 )

0.67 ( 0.47 )

3111.00 ( 107.34 )

14228.33 ( 241.84 )

0.02 ( 0.01 )

0.03

SWS10

brain

420.00 ( 41.09 )

232.00 ( 19.44 )

2565.00 ( 166.28 )

13152.67 ( 250.69 )

7.60 ( 0.08 )

8.0

NP

blood

3.40 ( 2.70 )

1.67 ( 1.25 )

2381.67 ( 237.10 )

12761.67 ( 1533.49 )

0.07 ( 0.05 )

0.04

SWS11

brain

4.60 ( 3.15 )

2.67 ( 1.70 )

2894.00 ( 226.81 )

14169.33 ( 1065.11 )

0.09 ( 0.06 )

0.03

blood

0.00 ( 0 )

0.00 ( 0 )

1078.33 ( 379.28 )

13129.00 ( 915.10 )

0.00 ( 0 )

0.03

SWS12

brain

136.67 ( 12.26 )

73.00 ( 20.22 )

2320.67 ( 629.80 )

12492.67 ( 2597.01 )

2.80 ( 0.08 )

4.0

NP

blood

0.87 ( 1.23 )

0.33 ( 0.47 )

1372.33 ( 544.09 )

10545.00 ( 2524.01 )

0.03 ( 0.04 )

0.04

SWS13

brain

170.67 ( 29.23 )

87.67 ( 10.62 )

2099.00 ( 302.03 )

12690.00 ( 3164.55 )

3.70 ( 0.08 )

4.0

NP

blood

3.67 ( 3.30 )

2.33 ( 2.05 )

2414.67 ( 78.47 )

14800.00 ( 921.06 )

0.09 ( 0.08 )

0.03

SWS14

brain

66.67 ( 4.11 )

43.00 ( 3.56 )

481.67 ( 24.64 )

15137.67 ( 854.48 )

8.07 ( 0.29 )

9.0

NP

blood

1.60 ( 1.23 )

1.00 ( 0.82 )

2086.67 ( 108.02 )

14751.33 ( 1099.24 )

0.04 ( 0.03 )

0.04

SWS15

brain

94.00 ( 21.42 )

55.33 ( 4.64 )

1485.67 ( 112.35 )

14378.33 ( 2276.07 )

3.43 ( 0.45 )

4.0

NP

blood

3.27 ( 1.23 )

2.00 ( 0.82 )

2560.33 ( 131.76 )

14101.00 ( 846.50 )

0.07 ( 0.02 )

0.03

  1. Mut: mutant, Wt: wild–type, ACD: number of accepted droplets, FA: fractional abundance, PFA: Poisson fractional abundance, deep–seq: mutant ratio by deep sequencing (previously reported)7, NP: not performed, + : positive, −: negative, + new: positive only by PNA–ddPCR (not by the other methods). ddPCR was performed in triplicate. SD values are shown in parentheses after the mean values. PNA–ddPCR was performed in triplicate where “ +new” is shown.