ClinVar Miner

Submissions for variant NM_001267550.2(TTN):c.103688T>C (p.Val34563Ala) (rs55945684)

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Total submissions: 14
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Submitter RCV SCV Clinical significance Condition Last evaluated Review status Method Comment
Laboratory for Molecular Medicine, Partners HealthCare Personalized Medicine RCV000040931 SCV000064622 uncertain significance not specified 2015-08-12 criteria provided, single submitter clinical testing The p.Val31995Ala variant in TTN has been reported in 1 adolescent with sudden c ardiac death, who carried a likely pathogenic variant in another gene (Campuzano 2014). This variant has also been identified by our laboratory in 1 individual with LVH, 1 adult with RV dilation and PVCs, and 3 individuals with HCM, two of whom carried possible disease-causing variants in other genes. This variant has been identified in 39/66726 European chromosomes by the Exome Aggregation Consor tium (ExAC, http://exac.broadinstitute.org; dbSNP rs55945684). Computational pre diction tools and conservation analysis do not provide strong support for or aga inst an impact to the protein. In summary, the clinical significance of the p.Va l31995Ala variant is uncertain.
GeneDx RCV000040931 SCV000237916 likely benign not specified 2017-06-01 criteria provided, single submitter clinical testing This variant is considered likely benign or benign based on one or more of the following criteria: it is a conservative change, it occurs at a poorly conserved position in the protein, it is predicted to be benign by multiple in silico algorithms, and/or has population frequency not consistent with disease.
Invitae RCV001083917 SCV000261429 likely benign Dilated cardiomyopathy 1G; Limb-girdle muscular dystrophy, type 2J 2020-11-17 criteria provided, single submitter clinical testing
Ambry Genetics RCV000245149 SCV000318898 likely benign Cardiovascular phenotype 2020-07-24 criteria provided, single submitter clinical testing In silico models in agreement (benign);Subpopulation frequency in support of benign classification
EGL Genetic Diagnostics, Eurofins Clinical Diagnostics RCV000725310 SCV000335950 uncertain significance not provided 2015-10-13 criteria provided, single submitter clinical testing
Illumina Clinical Services Laboratory,Illumina RCV000361393 SCV000420145 benign Tibial muscular dystrophy 2018-01-13 criteria provided, single submitter clinical testing This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score and internal cut-off values, a variant classified as benign is not then subjected to further curation. The score for this variant resulted in a classification of benign for this disease.
Illumina Clinical Services Laboratory,Illumina RCV000264463 SCV000420146 benign Myopathy, myofibrillar, 9, with early respiratory failure 2018-01-13 criteria provided, single submitter clinical testing This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score and internal cut-off values, a variant classified as benign is not then subjected to further curation. The score for this variant resulted in a classification of benign for this disease.
Illumina Clinical Services Laboratory,Illumina RCV000322000 SCV000420147 uncertain significance Dilated cardiomyopathy 1G 2018-01-13 criteria provided, single submitter clinical testing This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score, this variant could not be ruled out of causing disease and therefore its association with disease required further investigation. A literature search was performed for the gene, cDNA change, and amino acid change (if applicable). No publications were found based on this search. This variant was therefore classified as a variant of unknown significance for this disease.
Illumina Clinical Services Laboratory,Illumina RCV000263262 SCV000420149 uncertain significance Limb-girdle muscular dystrophy, type 2J 2018-01-13 criteria provided, single submitter clinical testing This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score, this variant could not be ruled out of causing disease and therefore its association with disease required further investigation. A literature search was performed for the gene, cDNA change, and amino acid change (if applicable). No publications were found based on this search. This variant was therefore classified as a variant of unknown significance for this disease.
Illumina Clinical Services Laboratory,Illumina RCV000316083 SCV000420150 uncertain significance Myopathy, early-onset, with fatal cardiomyopathy 2018-01-13 criteria provided, single submitter clinical testing This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score, this variant could not be ruled out of causing disease and therefore its association with disease required further investigation. A literature search was performed for the gene, cDNA change, and amino acid change (if applicable). No publications were found based on this search. This variant was therefore classified as a variant of unknown significance for this disease.
Athena Diagnostics Inc RCV000040931 SCV000615967 uncertain significance not specified 2017-05-25 criteria provided, single submitter clinical testing
Center for Advanced Laboratory Medicine, UC San Diego Health,University of California San Diego RCV000355491 SCV000995495 likely benign Hypertrophic cardiomyopathy 2018-08-22 criteria provided, single submitter clinical testing
CeGaT Praxis fuer Humangenetik Tuebingen RCV000725310 SCV001152587 uncertain significance not provided 2018-10-01 criteria provided, single submitter clinical testing
ARUP Laboratories, Molecular Genetics and Genomics,ARUP Laboratories RCV001287300 SCV001473975 uncertain significance none provided 2020-03-09 criteria provided, single submitter clinical testing The TTN c.103688T>C; p.Val34563Ala variant (rs55945684; ClinVar Variation ID: 47662) is reported in the literature in several individuals affected with HCM or DCM, though it was not demonstrated to cause disease (Franaszczyk 2017, Lopes 2013). This variant has been observed together with TTN variants p.Leu5742Phe and p.Glu33301Lys in the literature (Franaszczyk 2017, Lopes 2013) and in another individual tested at ARUP Laboratories. This suggests these three variants may occur in cis, although parental testing would be required to confirm this. This variant is rare in the population (<1% allele frequency in the Genome Aggregation Database) and the clinical relevance of rare missense variants in this gene, which are identified on average once per individual sequenced in affected populations (Herman 2012), is not well understood. Yet, evidence suggests that the vast majority of such missense variants do not contribute to the clinical outcome of DCM (Begay 2015). Thus, the clinical significance of the p.Val34563Ala variant cannot be determined with certainty. References: Begay RL et al. Role of Titin Missense Variants in Dilated Cardiomyopathy. J Am Heart Assoc. 2015 Nov 13;4(11). Franaszczyk M et al. Titin Truncating Variants in Dilated Cardiomyopathy - Prevalence and Genotype-Phenotype Correlations. PLoS One. 2017 Jan 3;12(1):e0169007. Herman DS et al. Truncations of titin causing dilated cardiomyopathy. N Engl J Med. 2012 Feb 16;366(7):619-28. Lopes LR et al. Genetic complexity in hypertrophic cardiomyopathy revealed by high-throughput sequencing. J Med Genet. 2013 Apr;50(4):228-39. Linke WA and Hamdani N. Gigantic business: titin properties and function through thick and thin. Circ Res 2014; 114(6): 1052-1068.

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