ClinVar Miner

Submissions for variant NM_001267550.2(TTN):c.69937_69938insGAAAAATACAGGCCGGGCGCGGTGGCTCACGCCTGTAATCCCAGCACTTTGGGAGGCCGAGGCGGGCGGATCATGAGGTCAGGAGATCGAGACCATCCTGGCTANNNNNNNNNNNNNNNNNNNAAAAAAAAAAAAAAAAAAAAAAAAAAA (p.Asn23313delinsArgLysIleGlnAlaGlyArgGlyGlySerArgLeuTer)

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Total submissions: 1
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Submitter RCV SCV Clinical significance Condition Last evaluated Review status Method Comment
Invitae RCV001378573 SCV001576174 likely pathogenic Dilated cardiomyopathy 1G; Autosomal recessive limb-girdle muscular dystrophy type 2J 2017-08-11 criteria provided, single submitter clinical testing 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 found in the A-band of this gene. Loss-of-function 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). Retrotransposon insertions including LINE1 (L1), Alu, and SVA (SINE-VNTR-Alu) have been reported to be disease-causing through disruption of either a coding region or splice site (PMID: 19763152, 20307669, 22406018). This variant has not been reported in the literature in individuals with TTN-related disease. This sequence change is an Alu-mediated insertion in exon 326 of the TTN mRNA (c.69937_69938insAlu), causing a frameshift at codon 23313 (p.Asn23313fs). The exact size and sequence of the insertion cannot be determined by the current assay. However, the insertion is expected to result in an absent or disrupted protein product.

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