ClinVar Miner

Submissions for variant NM_001267550.2(TTN):c.33826+1G>A

dbSNP: rs1389908421
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Total submissions: 3
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Submitter RCV SCV Clinical significance Condition Last evaluated Review status Method Comment
Genomic Research Center, Shahid Beheshti University of Medical Sciences RCV000625949 SCV000746545 pathogenic Dilated cardiomyopathy 1G 2020-05-03 criteria provided, single submitter clinical testing
GeneDx RCV001771842 SCV001993133 uncertain significance not provided 2019-08-07 criteria provided, single submitter clinical testing Canonical splice site variant within the I-band region; Not observed at a significant frequency in large population cohorts (Lek et al., 2016); Has not been previously published as pathogenic or benign to our knowledge
Labcorp Genetics (formerly Invitae), Labcorp RCV001860469 SCV002173099 likely pathogenic Dilated cardiomyopathy 1G; Autosomal recessive limb-girdle muscular dystrophy type 2J 2024-10-28 criteria provided, single submitter clinical testing This sequence change affects a donor splice site in intron 143 of the TTN gene. It is expected to disrupt RNA splicing and likely results in a truncated or disrupted TTN protein. This variant is present in population databases (no rsID available, gnomAD 0.004%). 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: 522785). Algorithms developed to predict the effect of sequence changes on RNA splicing suggest that this variant may disrupt the consensus splice site. This variant is located in the I band of TTN (PMID: 25589632). Truncating variants in this region have been reported in individuals affected with autosomal recessive centronuclear myopathy (PMID: 23975875, internal data). Truncating variants in this region have also been identified in individuals affected with autosomal dominant dilated cardiomyopathy and/or cardio-related conditions (PMID: 27869827, 32964742, internal data). 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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