ClinVar Miner

Submissions for variant NM_001267550.2(TTN):c.88696del (p.Ile29566fs)

dbSNP: rs1064796323
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Total submissions: 3
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Submitter RCV SCV Clinical significance Condition Last evaluated Review status Method Comment
GeneDx RCV000479254 SCV000572921 likely pathogenic not provided 2017-01-31 criteria provided, single submitter clinical testing The c.83773delA likely pathogenic variant in the TTN gene has not been reported previously as a pathogenic variant or as a benign variant, to our knowledge. This variant causes a shift in reading frame starting at codon isoleucine 27925, changing it to a serine, and creating a premature stop codon at position 46 of the new reading frame, denoted p.Ile27925SerfsX46. This likely pathogenic 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.83773delA 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). Furthermore, this variant is not observed in large population cohorts (Lek et al., 2016; Exome Variant Server).
Ambry Genetics RCV004992261 SCV005523583 likely pathogenic Cardiovascular phenotype 2024-11-09 criteria provided, single submitter clinical testing The c.61501delA variant, located in coding exon 159 of the TTN gene, results from a deletion of one nucleotide at nucleotide position 61501, causing a translational frameshift with a predicted alternate stop codon (p.I20501Sfs*46). This exon is located in the A-band region of the N2-B isoform of the titin protein and is constitutively expressed in TTN transcripts (percent spliced in or PSI 100%). This alteration is expected to result in loss of function by premature protein truncation or nonsense-mediated mRNA decay. While truncating variants in TTN are present in 1-3% of the general population, truncating variants in the A-band are the most common cause of dilated cardiomyopathy (DCM) (Herman DS et al. N. Engl. J. Med., 2012 Feb;366:619-28; Roberts AM et al. Sci Transl Med, 2015 Jan;7:270ra6). TTN truncating variants encoded in constitutive exons (PSI >90%) have been found to be significantly associated with DCM regardless of their position in titin (Schafer S et al. Nat. Genet., 2017 01;49:46-53). This variant is considered to be rare based on population cohorts in the Genome Aggregation Database (gnomAD). Based on the majority of available evidence to date, this variant is likely to be pathogenic.
Cardiogenetics and Myogenetics Molecular and Cellular Functional Unit, Aphp Sorbonne University-Hopital Pitie Salpetriere RCV004764930 SCV005375047 likely pathogenic Dilated cardiomyopathy 1G 2024-01-06 no assertion criteria provided clinical testing

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