Preliminary in silico assessment of the specificity of published molecular assays and design of new assays using the available whole genome sequences of 2019-nCoV

Updated to 54,429 COVID-19 WGS from GISAID.

Table 1. Results from PSET analysis. The five Noblis assays were compared alongside the four assays from Corman and three assays from the CDC. Along with assays from China, Hong Kong, Thailand, Japan, France, South Korea, and Singapore. Each assay was tested using SARS-CoV-2 as the intended target. All off-target hits (TN, PF, FP) are to entries in NCBI BLAST databases (nt and env_nt).

identifier type PT TP FN Percent True PF FP TN
Noblis.12 Probe 53921 230 278 99.49% 0 0 680
Noblis.40 Probe 52753 1525 151 99.72% 0 1 1420
Noblis.42 Probe 54023 118 288 99.47% 0 2 1136
Noblis.44 Probe 53559 260 610 98.88% 0 1 1786
Noblis.57 Probe 53411 528 490 99.10% 0 1 853
ncov_e_gene Probe 53985 168 276 99.49% 361 15 53
ncov_n_gene Probe 53515 597 317 99.42% 0 340 72
ncov_rdrp_1 Probe 0 54274 155 99.72% 433 105 5967
ncov_rdrp_2 Probe 2 54283 144 99.74% 2 73 5916
cdc_n1 Probe 52801 1481 147 99.73% 0 2 381
cdc_n2 Probe 53269 434 726 98.67% 0 1 372
cdc_n3 Probe 53422 807 200 99.63% 1 353 36
China_N Probe 37416 666 16347 69.97% 0 2 691
China_ORF1ab Probe 51819 432 2178 96.00% 1 0 367
France_nCoV_IP2 Probe 54026 226 177 99.67% 1 0 367
France_nCoV_IP4 Probe 53952 366 111 99.80% 0 0 1190
HKU-N Probe 53129 580 720 98.68% 327 33 34
HKU-ORF1b-nsp14 Probe 53922 338 169 99.69% 324 29 452
Japan_NIID_2019-nCOV_N Probe 0 53681 748 98.63% 0 0 384
Japan_NIID_WH-1_F24381 Outer 53440 689 300 99.45% 0 1 601
Japan_NIID_WH-1_F501 Outer 53229 822 378 99.31% 0 1 370
Japan_NIID_WH-1_F509 Outer 53368 597 464 99.15% 1 0 369
Japan_NIID_WH-1_Seq_F24383 Outer 53418 704 307 99.44% 0 0 606
Japan_NIID_WH-1_Seq_F519 Outer 53109 576 744 98.63% 0 1 369
Japan_WuhanCoV-spk1 Outer 53520 602 307 99.44% 1 1 594
Thailand_WH-NIC_N Probe 53610 661 158 99.71% 0 2 375
Chan-N Probe 53373 342 714 98.69% 4 3 353
Chan-ORF1ab Probe 0 53780 649 98.81% 0 5 2
Chan-S Probe 53251 203 975 98.21% 5 0 2
Niu-E Probe 53864 257 308 99.43% 26 359 0
Won-E Outer 2 54183 244 99.55% 0 384 1
Won-N Outer 53103 1060 266 99.51% 8 7 358
Won-ORF1ab Outer 53961 263 205 99.62% 5 2 313
Won-S Outer 52200 179 2050 96.23% 5 1 0
Yip-ORF1ab Outer 53597 210 622 98.86% 5 1 1
Young-N Probe 0 54150 279 99.49% 0 5 1
Young-ORF1ab Probe 54134 179 116 99.79% 5 1 0
Young-S Probe 53562 464 403 99.26% 4 1 0