ClinVar Miner

Submissions for variant NM_001267550.2(TTN):c.95195C>T (p.Pro31732Leu)

gnomAD frequency: 0.00001  dbSNP: rs753334568
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Total submissions: 13
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Submitter RCV SCV Clinical significance Condition Last evaluated Review status Method Comment
Labcorp Genetics (formerly Invitae), Labcorp RCV000684823 SCV000543162 pathogenic Dilated cardiomyopathy 1G; Autosomal recessive limb-girdle muscular dystrophy type 2J 2023-12-22 criteria provided, single submitter clinical testing This sequence change replaces proline, which is neutral and non-polar, with leucine, which is neutral and non-polar, at codon 31732 of the TTN protein (p.Pro31732Leu). This variant is present in population databases (rs753334568, gnomAD 0.003%). This missense change has been observed in individual(s) with hereditary myopathy with early respiratory failure (HMERF) (PMID: 22526018, 23486992, 23606733, 25500009). In at least one individual the variant was observed to be de novo. This variant is also known as c.90272C>T (p.Pro30091Leu) and c.68576C>T (p.Pro22859Leu). ClinVar contains an entry for this variant (Variation ID: 132137). Algorithms developed to predict the effect of variants on protein structure and function are not available or were not evaluated for this variant. Experimental studies have shown that this missense change affects TTN function (PMID: 24636144). This variant is located in the A band of TTN (PMID: 25589632). Variants in this region may be relevant for cardiac or neuromuscular disorders (PMID: 25589632, 23975875). For these reasons, this variant has been classified as Pathogenic.
Eurofins Ntd Llc (ga) RCV000727672 SCV000854982 pathogenic not provided 2017-12-03 criteria provided, single submitter clinical testing
CeGaT Center for Human Genetics Tuebingen RCV000727672 SCV001248005 pathogenic not provided 2018-12-01 criteria provided, single submitter clinical testing
Institute of Medical Genetics and Applied Genomics, University Hospital Tübingen RCV000727672 SCV001446810 likely pathogenic not provided 2020-10-23 criteria provided, single submitter clinical testing
Revvity Omics, Revvity RCV000727672 SCV002022468 pathogenic not provided 2023-04-01 criteria provided, single submitter clinical testing
AiLife Diagnostics, AiLife Diagnostics RCV000727672 SCV002503099 likely pathogenic not provided 2021-12-14 criteria provided, single submitter clinical testing
Fulgent Genetics, Fulgent Genetics RCV002492403 SCV002791108 pathogenic Dilated cardiomyopathy 1G; Autosomal recessive limb-girdle muscular dystrophy type 2J; Tibial muscular dystrophy; Myopathy, myofibrillar, 9, with early respiratory failure; Early-onset myopathy with fatal cardiomyopathy; Hypertrophic cardiomyopathy 9 2021-08-14 criteria provided, single submitter clinical testing
GeneDx RCV000727672 SCV004014222 pathogenic not provided 2023-03-22 criteria provided, single submitter clinical testing Identified in a patient with Lambert-Eaton Myasthenic Syndrome (LEMS) who also harbored a pathogenic variant in the CACNA1S gene (Cerino et al., 2022); Not observed at significant frequency in large population cohorts (gnomAD); Published functional studies indicates this variant results in an insoluble protein due to improper folding (Hedburg et al., 2014); In silico analysis supports that this missense variant has a deleterious effect on protein structure/function; This variant is associated with the following publications: (PMID: 22526018, 25500009, 23486992, 23446887, 34839411, 24636144, 35741838, 32039858, 34670883)
Ambry Genetics RCV003343647 SCV004066464 likely pathogenic Cardiovascular phenotype 2023-06-16 criteria provided, single submitter clinical testing The p.P22667L variant (also known as c.68000C>T), located in coding exon 170 of the TTN gene, results from a C to T substitution at nucleotide position 68000. The proline at codon 22667 is replaced by leucine, an amino acid with similar properties. This variant (also referred to as p.P31732L and p.P30091L) has been detected in the homozygous and heterozygous states, including a de novo occurrence, in individuals with skeletal muscle and/or respiratory issues consistent with hereditary myopathy with early respiratory failure (HMERF). Homozygous individuals tended to be more severely affected, and not all heterozygous individuals were affected, suggesting this variant exhibits variable expressivity and reduced penetrance (Vasli N et al. Acta Neuropathol., 2012 Aug;124:273-83; Yue D et al. Neuromuscul. Disord., 2015 Feb;25:172-6; Palmio J et al. J Neurol Neurosurg Psychiatry, 2014 Mar;85:345-53; Pfeffer G et al. J. Neurol. Neurosurg. Psychiatry, 2014 Mar;85:331-8; Cerino M et al. Muscle Nerve, 2017 Nov;56:993-997; Savarese M et al. J Neuromuscul Dis, 2020;7:153-166; Rees M et al. Acta Neuropathol, 2021 Mar;141:431-453; Cerino M et al. Genes (Basel), 2022 Jun;13). Functional studies suggest this variant may be destabilizing and impact protein folding (Hedberg C et al. Neuromuscul. Disord. 2014 May;24(5):373-9; Rees M et al. Acta Neuropathol, 2021 Mar;141:431-453). This amino acid position is highly conserved in available vertebrate species. In addition, this alteration is predicted to be deleterious by in silico analysis. Based on the supporting evidence, this alteration is likely pathogenic for hereditary myopathy with early respiratory failure; however, the association of this alteration with cardiomyopathy is unknown.
Women's Health and Genetics/Laboratory Corporation of America, LabCorp RCV003987364 SCV004804343 pathogenic Primary familial dilated cardiomyopathy 2024-01-09 criteria provided, single submitter clinical testing Variant summary: TTN c.87491C>T (p.Pro29164Leu) results in a non-conservative amino acid change located in the A-band domain of the encoded protein sequence. Four of four in-silico tools predict a damaging effect of the variant on protein function. The variant allele was found at a frequency of 1.2e-05 in 248136 control chromosomes (gnomAD). c.87491C>T has been reported in the literature in multiple individuals with characteristic features of hereditary myopathy with early respiratory failure (Palmio_2013, Yue_2014, Hedberg_2014, Cerino_2022). These data indicate that the variant is very likely to be associated with disease. At least one publication reports experimental evidence evaluating an impact on protein function and this variant results in impaired protein solubility (Hedberg_2014). The following publications have been ascertained in the context of this evaluation (PMID: 35741838, 24231549, 23606733, 25500009). ClinVar contains an entry for this variant (Variation ID: 132137). Based on the evidence outlined above, the variant was classified as pathogenic.
Center for Genomic Medicine, King Faisal Specialist Hospital and Research Center RCV003988827 SCV004805328 likely pathogenic Dilated cardiomyopathy 1G 2024-03-25 criteria provided, single submitter research
Muscle and Diseases Team, Institut de Génétique et Biologie Moléculaire et Cellulaire RCV004586554 SCV005038531 likely pathogenic Hereditary inclusion-body myopathy 2024-03-01 criteria provided, single submitter research PM1+PM2+PP1+PP2+PP3
GeneReviews RCV000119025 SCV000153727 not provided Myopathy, myofibrillar, 9, with early respiratory failure no assertion provided literature only

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