Table 2.
Distribution within troponin of apparently tolerated mutation sites from gnomAD v2
Troponin subunit or subunit regionSites without VUS or pathogenic substitutionSites with gnomAD alleles onlyDensity of sites with gnomAD alleles only (%)P vs. troponin (or P vs. troponin without TnC N-lobe)
Troponin 
All TnI, TnT, TnC 563 171 30.4  
All except TnC TnI, TnT 406 133 32.8  
All except TnC N-lobe TnC86–161, TnI, TnT 478 162 33.9  
Unseen by Cryo-EM (See legend) 167 68 40.7 0.0004 (0.014) 
TnI 
All 1–210 165 57 34.5 NS (NS) 
N 2/3 1–136 124 50 40.3 0.005 (NS) 
C 1/3 137–210 41 17.1 0.036 (0.011) 
TnT 
All 1–288 241 76 31.5 NS (NS) 
Cryo-EM tail helix 87–150 48 11 22.9 NS (NS) 
TnC 
All 1–161 157 38 24.2 0.029 
N-lobe 1–85 85 10.6 <0.0001 
C-lobe 86–161 72 29 40.3 0.036 (NS) 
Troponin subunit or subunit regionSites without VUS or pathogenic substitutionSites with gnomAD alleles onlyDensity of sites with gnomAD alleles only (%)P vs. troponin (or P vs. troponin without TnC N-lobe)
Troponin 
All TnI, TnT, TnC 563 171 30.4  
All except TnC TnI, TnT 406 133 32.8  
All except TnC N-lobe TnC86–161, TnI, TnT 478 162 33.9  
Unseen by Cryo-EM (See legend) 167 68 40.7 0.0004 (0.014) 
TnI 
All 1–210 165 57 34.5 NS (NS) 
N 2/3 1–136 124 50 40.3 0.005 (NS) 
C 1/3 137–210 41 17.1 0.036 (0.011) 
TnT 
All 1–288 241 76 31.5 NS (NS) 
Cryo-EM tail helix 87–150 48 11 22.9 NS (NS) 
TnC 
All 1–161 157 38 24.2 0.029 
N-lobe 1–85 85 10.6 <0.0001 
C-lobe 86–161 72 29 40.3 0.036 (NS) 

Distribution is shown for all 563 troponin residues that were not implicated in recent summaries of clinical experience as sites of any pathogenic or possibly pathogenic (VUS) missense substitutions, but that did contain at least one missense substitution in the gnomAD v2, whole-exome, whole-genome population data. Areas unseen by cryo-EM are the same as in Table 1. P values for the observed densities were calculated as described in Materials and methods. NS indicates P > 0.05.

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