ClinVar Miner

Submissions for variant NM_001267550.2(TTN):c.97114dup (p.Arg32372fs)

dbSNP: rs1064793419
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Total submissions: 3
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Submitter RCV SCV Clinical significance Condition Last evaluated Review status Method Comment
GeneDx RCV000486249 SCV000566076 likely pathogenic not provided 2022-01-31 criteria provided, single submitter clinical testing Has not been previously published as pathogenic or benign to our knowledge; Not observed at significant frequency in large population cohorts (gnomAD); Frameshift variant predicted to result in protein truncation or nonsense mediated decay in a gene for which loss-of-function is a known mechanism of disease; 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); Reported in ClinVar as a likely pathogenic variant (ClinVar Variant ID# 418768); This variant is associated with the following publications: (PMID: 22335739)
Invitae RCV000559029 SCV000642485 likely pathogenic Dilated cardiomyopathy 1G 2017-02-24 criteria provided, single submitter clinical testing This sequence change inserts 1 nucleotide in exon 348 of the TTN mRNA (c.97114dupA), causing a frameshift at codon 32372. This creates a premature translational stop signal (p.Arg32372Lysfs*9) and is expected to result in a disrupted protein product. This variant is found in the A-band of this gene. While this particular variant has not been reported in the literature, truncating variants in the A-band of TTN are significantly overrepresented in patients with dilated cardiomyopathy and are considered to be likely pathogenic for the disease (PMID: 25589632). For these reasons, this variant has been classified as Likely Pathogenic.
Invitae RCV001379068 SCV001576797 likely pathogenic Dilated cardiomyopathy 1G; Autosomal recessive limb-girdle muscular dystrophy type 2J 2024-01-17 criteria provided, single submitter clinical testing This sequence change creates a premature translational stop signal (p.Arg32372Lysfs*9) 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 premature translational stop signal has been observed in individual(s) with dilated cardiomyopathy (Invitae). ClinVar contains an entry for this variant (Variation ID: 418768). 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.

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