Total submissions: 2
| Submitter | RCV | SCV | Clinical significance | Condition | Last evaluated | Review status | Method | Comment |
|---|---|---|---|---|---|---|---|---|
| Gene |
RCV000422368 | SCV000517099 | pathogenic | not provided | 2015-05-15 | criteria provided, single submitter | clinical testing | The C15978X variant in the TTN gene has not been reported previously as a pathogenic variant or asa benign polymorphism, to our knowledge. C15978X is predicted to cause loss of normal protein functioneither due to production of an abnormal, prematurely truncated protein, or by absence of protein product dueto nonsense mediated mRNA decay. Other truncating TTN variants have been reported in approximately 3%of control alleles (Herman D et al., 2012). However, C15978X is located in the A-band region of titin, wherethe majority of truncating variants associated with DCM have been reported (Herman D et al., 2012).Furthermore, C15978X was not observed in approximately 6,200 individuals of European and AfricanAmerican ancestry in the NHLBI Exome Sequencing Project, indicating it is not a common benign variant inthese populations. In summary, C15978X in the TTN gene is interpreted as a pathogenic variant. |
| Labcorp Genetics |
RCV005222924 | SCV005863152 | likely pathogenic | Dilated cardiomyopathy 1G; Autosomal recessive limb-girdle muscular dystrophy type 2J | 2024-09-30 | criteria provided, single submitter | clinical testing | This sequence change creates a premature translational stop signal (p.Cys17619*) in the TTN gene. While this is not anticipated to result in nonsense mediated decay, it is expected to create a truncated TTN protein. This variant is not present in population databases (gnomAD no frequency). This variant has not been reported in the literature in individuals affected with TTN-related conditions. ClinVar contains an entry for this variant (Variation ID: 379746). This variant is located in the A band of TTN (PMID: 25589632). Truncating variants in this region are significantly overrepresented in patients affected with dilated cardiomyopathy (PMID: 25589632). Truncating variants in this region have also been reported in individuals affected with autosomal recessive centronuclear myopathy (PMID: 23975875). In summary, the currently available evidence indicates that the variant is pathogenic, but additional data are needed to prove that conclusively. Therefore, this variant has been classified as Likely Pathogenic. |