Table 1. DHODH genotype and corresponding dose-response phenotype for representative in vitro TCMDC-125334 selected lines.
| Clone ID | DHODH mutation(s)* | DHODH CNV | TCMDC-125334 EC50 (nM) | DSM265EC50 (nM) | IDI-6273 EC50 (nM) | Genz669178 EC50 (nM) |
|---|---|---|---|---|---|---|
| 3D7 A10 | WT | 1 | 140±42.6 | 4.5±1.6 | 502±209 | 6.9±2.2 |
| T-F1-C1 | WT | 2 | 280±81.3 | 8.2±2.6 | 993±220 | 16.9±6.70 |
| T-F1-C2 | WT | 3 | 426±146** | 12.5±2.36* | 1597±212* | 27.0±10.0* |
| T-F2-C1 | I263S | 1 | 432±130.8** | 2.5±0.74 | 7057±671** | 26.7±15.5* |
| T-F2-C2 | WT | 1 | 137±25.1 | 4.3±0.94 | 572±91.5 | 7.79±3.42 |
| Overall p-value (approximate) | 0.0004 | 0.0013 | 0.0007 | 0.0013 | ||
| Kruskall-Wallis statistic | 28.52 | 25.54 | 27.05 | 25.50 | ||
The parasite lines are each designated with a unique identifier; for example, T-F1-C1 was selected with TCDC-125334 (T) came from flask 1 (F1), and is designated as ‘C1’ for ‘Clone 1’. Data is shown as mean EC50 ± standard deviation. Statistical significance was determined by a Kruskal-Wallis test, with post hoc multiple comparisons (Dunn’s) of each clone to 3D7 A10. *p≤0.05; **p≤0.01. Overall statistics are reported for each comparison group. Each dose-response assay was performed with triplicate technical replicates, and average EC50’s were obtained from 3 to 4 independent biological replicates.
Variants identified by whole-genome sequencing.