The table below lists the 5 rare (MAF<0.0001 in ExAC) truncating MYH7 variants identified in a cohort of 6112 HCM patients (3200 patients from OMGL, 2912 patients from LMM). When this rare variant frequency of 0.00082 is compared with a background population rate of 0.00048, there is a case excess of 0.00034, although this is not statistically significant for truncating MYH7 variants in HCM (p=0.2356).
| No. | Variant (CDS)▼ | Variant (Protein) | Variant Type▼ | Cases (6112)▼ | OMGL class | LMM class | ExAC frequency |
|---|---|---|---|---|---|---|---|
| 1. | c.4000C>T | p.Q1334X | nonsense | 1 | VUS (1) | 0.000000 | |
| 2. | c.5110C>T | p.Q1704X | nonsense | 1 | VUS (1) | 0.000000 | |
| 3. | c.345C>A | p.Y115X | nonsense | 2 | VUS (2) | 0.000000 | |
| 4. | c.1477_1478delAT | frameshift | 1 | VUS (1) | 0.000000 |
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.