The table below lists the 59 rare (MAF<0.0001 in ExAC) protein-altering TNNT2 variants identified in a cohort of 3191 HCM patients. When this rare variant frequency of 0.01849 is compared with a background population rate of 0.00242, there is a statistically significant case excess of 0.01607 (p<0.0001), which suggests that approximately 51 of these variants may be pathogenic.
| No. | Variant (CDS)▼ | Variant (Protein) | Variant Type▼ | Cases (3191)▼ | OMGL class | ExAC frequency |
|---|---|---|---|---|---|---|
| 1. | c.236T>A | p.I79N | missense | 8 | Pathogenic | 0.000000 |
| 2. | c.487_489delGAG | inframe | 5 | Pathogenic | 0.000000 | |
| 3. | c.833G>C | p.R278P | missense | 5 | Likely Pathogenic | 0.000000 |
| 4. | c.274C>T | p.R92W | missense | 5 | Pathogenic | 0.000008 |
| 5. | c.856C>T | p.R286C | missense | 4 | Likely Pathogenic | 0.000011 |
| 6. | c.785A>G | p.N262S | missense | 4 | VUS | 0.000000 |
| 7. | c.571-1G>A | essential splice site | 4 | VUS | 0.000017 | |
| 8. | c.281G>T | p.R94L | missense | 3 | Likely Pathogenic | 0.000000 |
| 9. | c.388C>T | p.R130C | missense | 2 | Likely Pathogenic | 0.000000 |
| 10. | c.833G>A | p.R278H | missense | 1 | VUS | 0.000021 |
| 11. | c.392G>A | p.R131Q | missense | 1 | VUS | 0.000000 |
| 12. | c.269T>A | p.I90N | missense | 1 | VUS | 0.000000 |
| 13. | c.502G>C | p.A168P | missense | 1 | VUS | 0.000000 |
| 14. | c.275G>A | p.R92Q | missense | 1 | Pathogenic | 0.000000 |
| 15. | c.451C>T | p.R151C | missense | 1 | VUS | 0.000000 |
| 16. | c.767A>G | p.Q256R | missense | 1 | VUS | 0.000000 |
| 17. | c.291G>T | p.K97N | missense | 1 | Likely Pathogenic | 0.000000 |
| 18. | c.487G>A | p.E163K | missense | 1 | Likely Pathogenic | 0.000000 |
| 19. | c.821+1G>C | essential splice site | 1 | Pathogenic | 0.000000 | |
| 20. | c.147_149delAGA | p.Glu51del | inframe | 1 | VUS | 0.000008 |
| 21. | c.256G>T | p.D86Y | missense | 1 | VUS | 0.000000 |
| 22. | c.426T>G | p.N142K | missense | 1 | VUS | 0.000000 |
| 23. | c.400C>T | p.R134W | missense | 1 | VUS | 0.000000 |
| 24. | c.678_680del | p.Glu226del | inframe | 1 | VUS | 0.000000 |
| 25. | c.460-1G>C | essential splice site | 1 | VUS | 0.000000 | |
| 26. | c.805A>G | p.N269D | missense | 1 | VUS | 0.000017 |
| 27. | c.145G>C | p.E49Q | missense | 1 | VUS | 0.000008 |
| 28. | c.311C>T | p.A104V | missense | 1 | VUS | 0.000008 |
1. Roddy Walsh, Kate L. Thomson, James S. Ware, Birgit H. Funke, Jessica Woodley, Karen J. McGuire, Francesco Mazzarotto, Edward Blair, Anneke Seller, Jenny C. Taylor, Eric V. Minikel, Exome Aggregation Consortium, Daniel G. MacArthur, Martin Farrall, Stuart A. Cook and Hugh Watkins. Reassessment of Mendelian gene pathogenicity using 7,855 cardiomyopathy cases and 60,706 reference samples. Genet Med. 2016 doi:10.1038/gim.2016.90.
2. Alfares AA, Kelly MA, McDermott G, Funke BH, Lebo MS, Baxter SB, Shen J, McLaughlin HM, Clark EH, Babb LJ, Cox SW, DePalma SR, Ho CY, Seidman JG, Seidman CE, Rehm HL. Results of clinical genetic testing of 2,912 probands with hypertrophic cardiomyopathy: expanded panels offer limited additional sensitivity. Genet Med. 2015 Nov;17(11):880-8.