ClinVar Miner

Submissions for variant NM_001267550.2(TTN):c.104087del (p.Pro34696fs)

dbSNP: rs1553489404
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Total submissions: 2
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Submitter RCV SCV Clinical significance Condition Last evaluated Review status Method Comment
Eurofins Ntd Llc (ga) RCV000596071 SCV000706705 likely pathogenic not provided 2017-03-09 criteria provided, single submitter clinical testing
Ambry Genetics RCV004992376 SCV005521732 likely pathogenic Cardiovascular phenotype 2024-07-03 criteria provided, single submitter clinical testing The c.76892delC variant, located in coding exon 185 of the TTN gene, results from a deletion of one nucleotide at nucleotide position 76892, causing a translational frameshift with a predicted alternate stop codon (p.P25631Qfs*51). This exon is located in the M-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 variant is considered to be rare based on population cohorts in the Genome Aggregation Database (gnomAD). 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 M-band have been reported in association with autosomal recessive titinopathies, primarily presenting with skeletal myopathy phenotypes (Ceyhan-Birsoy O et al. Neurology. 2013 Oct 1;81(14):1205-14; De Cid R et al. Neurology. 2015;85(24):2126-35). In addition, regardless of their position, TTN truncating variants encoded in constitutive exons (PSI >90%) have been found to be significantly associated with dilated cardiomyopathy (DCM), though truncating variants in the A-band are the most common cause of 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; Schafer S et al. Nat. Genet., 2017 01;49:46-53). Based on the majority of available evidence to date, this variant is likely to be pathogenic in association with autosomal recessive titinopathy; however, the clinical significance of this alteration with respect to cardiomyopathy remains unclear.

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