ClinVar Miner

Submissions for variant NM_001267550.2(TTN):c.97417del (p.Arg32473fs)

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Total submissions: 3
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Submitter RCV SCV Clinical significance Condition Last evaluated Review status Method Comment
Ambry Genetics RCV004508696 SCV005020720 pathogenic Cardiovascular phenotype 2023-12-12 criteria provided, single submitter clinical testing The c.70222delC pathogenic mutations, located in coding exon 176 of the TTN gene, results from a deletion of one nucleotide at nucleotide position 70222, causing a translational frameshift with a predicted alternate stop codon (p.R23408Vfs*19). 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 variant has been reported in individuals with dilated cardiomyopathy (DCM) (Walsh R et al. Genet Med, 2017 Feb;19:192-203). This variant is considered to be rare based on population cohorts in the Genome Aggregation Database (gnomAD). In addition to the clinical data presented in the literature, 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). Based on the supporting evidence, this alteration is interpreted as a disease-causing mutation.
Muscle and Diseases Team, Institut de Génétique et Biologie Moléculaire et Cellulaire RCV004587597 SCV005038524 likely pathogenic Centronuclear myopathy 2024-03-01 criteria provided, single submitter research PVS1+PM2
Cardiogenetics and Myogenetics Molecular and Cellular Functional Unit, Aphp Sorbonne University-Hopital Pitie Salpetriere RCV004765010 SCV005375080 likely pathogenic Dilated cardiomyopathy 1G 2024-01-06 no assertion criteria provided clinical testing

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