ClinVar Miner

Submissions for variant NM_001267550.2(TTN):c.80044_80047dup (p.Thr26683fs)

dbSNP: rs1553586069
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Total submissions: 2
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Submitter RCV SCV Clinical significance Condition Last evaluated Review status Method Comment
GeneDx RCV000627593 SCV000748593 likely pathogenic not provided 2018-04-17 criteria provided, single submitter clinical testing The c.75121_75124dupGACA likely pathogenic variant in the TTN gene has not been published as pathogenic or benign to our knowledge. c.75121_75124dupGACA causes a shift in reading frame starting at codon threonine 25042, changing it to an arginine, and creating a premature stop codon at position 29 of the new reading frame, denoted p.Thr25042ArgfsX29. This variant is expected to result in either an abnormal, truncated protein product or loss of protein from this allele through nonsense-mediated mRNA decay. Other truncating TTN variants have been reported in approximately 3% of control alleles (Herman et al., 2012). However, c.75121_75124dupGACA is located in the A-band region of titin, where the majority of truncating pathogenic variants associated with DCM have been reported (Herman et al., 2012). Moreover, the c.75121_75124dupGACA variant has not been observed in large population cohorts (Lek et al., 2016).
Invitae RCV001377002 SCV001574218 likely pathogenic Dilated cardiomyopathy 1G; Autosomal recessive limb-girdle muscular dystrophy type 2J 2022-03-07 criteria provided, single submitter clinical testing This variant is not present in population databases (gnomAD no frequency). 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. 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). Algorithms developed to predict the effect of sequence changes on RNA splicing suggest that this variant may create or strengthen a splice site. ClinVar contains an entry for this variant (Variation ID: 524097). This variant has not been reported in the literature in individuals affected with TTN-related conditions. This sequence change creates a premature translational stop signal (p.Thr26683Argfs*29) in the TTN gene. While this is not anticipated to result in nonsense mediated decay, it is expected to create a truncated TTN protein.

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