Submissions for variant NM_001267550.2(TTN):c.26494A>G (p.Ile8832Val)

gnomAD frequency: 0.00083  dbSNP: rs72648989

Total submissions: 20

Submitter	RCV	SCV	Clinical significance	Condition	Last evaluated	Review status	Method	Comment
Biesecker Lab/Clinical Genomics Section, National Institutes of Health	RCV000172380	SCV000055043	uncertain significance	not provided	2013-06-24	criteria provided, single submitter	research
Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine	RCV000154645	SCV000204320	uncertain significance	not specified	2014-09-19	criteria provided, single submitter	clinical testing	Variant classified as Uncertain Significance - Favor Benign. The Ile7588Val vari ant in TTN has been identified by our laboratory in 1 Caucasian adult with HCM w ho also carried a pathogenic variant in another gene and 1 adult of unspecified ethnicity with DCM. This variant has been also been identified in 0.1% (8/8156) of European American chromosomes by the NHLBI Exome Sequencing Project (http://e vs.gs.washington.edu/EVS/, Ng 2013; dbSNP rs72648989). Computational prediction tools and conservation analysis suggest that the Ile7588Val variant may not impa ct the protein, though this information is not predictive enough to rule out pat hogenicity. In addition, 1 fish (yellowbelly pufferfish) carries a valine at thi s position, raising the possibility that this change may be tolerated. In summar y, while the clinical significance of the Ile7588Val variant is uncertain, its f requency in controls suggests that it is more likely to be benign.
GeneDx	RCV000172380	SCV000238376	likely benign	not provided	2020-09-23	criteria provided, single submitter	clinical testing	This variant is associated with the following publications: (PMID: 23396983, 23861362)
Labcorp Genetics (formerly Invitae), Labcorp	RCV001083732	SCV000286537	likely benign	Dilated cardiomyopathy 1G; Autosomal recessive limb-girdle muscular dystrophy type 2J	2024-01-25	criteria provided, single submitter	clinical testing
Eurofins Ntd Llc (ga)	RCV000172380	SCV000335896	uncertain significance	not provided	2015-09-25	criteria provided, single submitter	clinical testing
Genetic Services Laboratory, University of Chicago	RCV000154645	SCV000597668	uncertain significance	not specified	2016-09-20	criteria provided, single submitter	clinical testing
Athena Diagnostics	RCV000172380	SCV000616038	likely benign	not provided	2020-08-03	criteria provided, single submitter	clinical testing
CeGaT Center for Human Genetics Tuebingen	RCV000172380	SCV001153023	likely benign	not provided	2024-11-01	criteria provided, single submitter	clinical testing	TTN: BP4
Illumina Laboratory Services, Illumina	RCV001131542	SCV001291169	uncertain significance	Early-onset myopathy 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.
Illumina Laboratory Services, Illumina	RCV001131543	SCV001291170	uncertain significance	Autosomal recessive 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 Laboratory Services, Illumina	RCV001131544	SCV001291171	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 Laboratory Services, Illumina	RCV001131545	SCV001291172	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 Laboratory Services, Illumina	RCV001131546	SCV001291173	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.
CHEO Genetics Diagnostic Laboratory, Children's Hospital of Eastern Ontario	RCV001170862	SCV001333483	uncertain significance	Cardiomyopathy	2017-12-20	criteria provided, single submitter	clinical testing
Women's Health and Genetics/Laboratory Corporation of America, LabCorp	RCV000154645	SCV001337972	likely benign	not specified	2020-01-20	criteria provided, single submitter	clinical testing	Variant summary: TTN c.22762A>G (p.Ile7588Val) results in a conservative amino acid change located in the I-Band region of the encoded protein sequence. Three of four in-silico tools predict a benign effect of the variant on protein function. The variant allele was found at a frequency of 0.00077 in 245890 control chromosomes. The observed variant frequency is approximately 1.24 fold of the estimated maximal expected allele frequency for a pathogenic variant in TTN causing Cardiomyopathy phenotype (0.00063), strongly suggesting that the variant is benign. c.22762A>G has been reported in the literature without strong evidence for causality (Campuzano_2015, Mademont-Soler_2017). These report(s) do not provide unequivocal conclusions about association of the variant with Cardiomyopathy. To our knowledge, no experimental evidence demonstrating an impact on protein function has been reported. Five clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar after 2014 without evidence for independent evaluation. Multiple laboratories reported the variant with conflicting assessments (3 VUS, 2 likely benign). Based on the evidence outlined above, the variant was classified as likely benign.
Mayo Clinic Laboratories, Mayo Clinic	RCV000172380	SCV001713241	uncertain significance	not provided	2023-01-16	criteria provided, single submitter	clinical testing	BP4
Diagnostic Laboratory, Department of Genetics, University Medical Center Groningen	RCV000172380	SCV001739794	likely benign	not provided		no assertion criteria provided	clinical testing
Clinical Genetics, Academic Medical Center	RCV000154645	SCV001917536	benign	not specified		no assertion criteria provided	clinical testing
Joint Genome Diagnostic Labs from Nijmegen and Maastricht, Radboudumc and MUMC+	RCV000172380	SCV001953665	likely benign	not provided		no assertion criteria provided	clinical testing
PreventionGenetics, part of Exact Sciences	RCV004534959	SCV004755043	likely benign	TTN-related disorder	2023-11-29	no assertion criteria provided	clinical testing	This variant is classified as likely benign based on ACMG/AMP sequence variant interpretation guidelines (Richards et al. 2015 PMID: 25741868, with internal and published modifications).