ClinVar Miner

Submissions for variant NM_001267550.2(TTN):c.46305-1G>C

dbSNP: rs1553714845
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Total submissions: 1
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Submitter RCV SCV Clinical significance Condition Last evaluated Review status Method Comment
Labcorp Genetics (formerly Invitae), Labcorp RCV000642766 SCV000764453 uncertain significance Dilated cardiomyopathy 1G; Autosomal recessive limb-girdle muscular dystrophy type 2J 2017-12-22 criteria provided, single submitter clinical testing This sequence change affects an acceptor splice site in intron 248 of 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 (ExAC no frequency). This variant has not been reported in the literature in individuals with TTN-related disease. This variant identified in the TTN gene is located in the I band of the resulting protein (PMID: 25589632). Algorithms developed to predict the effect of sequence changes on RNA splicing suggest that this variant may disrupt the consensus splice site, but this prediction has not been confirmed by published transcriptional studies. In summary, although this is a novel truncating variant, truncating variants in this region of the TTN gene have been shown to be highly prevalent in the TTN gene in the general population and unaffected individuals (PMID: 26701604, 22335739). However, truncating mutations in this region have also been reported to cause autosomal recessive congenital myopathy (PMID: 23975875). Therefore without additional functional and/or genetic data, this variant has been classified as a Variant of Uncertain Significance.

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