Submissions for variant NM_001267550.2(TTN):c.3409G>C (p.Gly1137Arg)

gnomAD frequency: 0.00293  dbSNP: rs72647870

Total submissions: 16

Submitter	RCV	SCV	Clinical significance	Condition	Last evaluated	Review status	Method	Comment
Biesecker Lab/Clinical Genomics Section, National Institutes of Health	RCV000172731	SCV000051508	likely benign	not provided	2013-06-24	criteria provided, single submitter	research
Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine	RCV000040219	SCV000063910	likely benign	not specified	2014-12-30	criteria provided, single submitter	clinical testing	p.Gly1137Arg in exon 21 of TTN: This variant is not expected to have clinical si gnificance because it has been identified in 0.3% (230/67514) of European chromo somes by the Exome Aggregation Consortium (ExAC, http://exac.broadinstitute.org; dbSNP rs72647870).
GeneDx	RCV000040219	SCV000237842	benign	not specified	2017-01-13	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	RCV001084204	SCV000286592	likely benign	Dilated cardiomyopathy 1G; Autosomal recessive limb-girdle muscular dystrophy type 2J	2024-01-31	criteria provided, single submitter	clinical testing
PreventionGenetics, part of Exact Sciences	RCV000040219	SCV000315484	likely benign	not specified		criteria provided, single submitter	clinical testing
Ambry Genetics	RCV000250640	SCV000318003	likely benign	Cardiovascular phenotype	2019-02-07	criteria provided, single submitter	clinical testing	Other strong data supporting benign classification
Eurofins Ntd Llc (ga)	RCV000040219	SCV000332048	likely benign	not specified	2015-06-11	criteria provided, single submitter	clinical testing
Center for Advanced Laboratory Medicine, UC San Diego Health, University of California San Diego	RCV000852941	SCV000995687	likely benign	Hypertrophic cardiomyopathy	2017-07-06	criteria provided, single submitter	clinical testing
CeGaT Center for Human Genetics Tuebingen	RCV000172731	SCV001153189	likely benign	not provided	2024-06-01	criteria provided, single submitter	clinical testing	TTN: BS2
Illumina Laboratory Services, Illumina	RCV001129652	SCV001289192	uncertain significance	Early-onset myopathy with fatal cardiomyopathy	2017-04-27	criteria provided, single submitter	clinical testing	This variant was observed as part of a predisposition screen in an ostensibly healthy population. A literature search was performed for the gene, cDNA change, and amino acid change (where applicable). No publications were found based on this search. Allele frequency data from public databases did not allow this variant to be ruled in or out of causing disease. Therefore, this variant is classified as a variant of unknown significance.
Illumina Laboratory Services, Illumina	RCV001129653	SCV001289193	benign	Autosomal recessive limb-girdle muscular dystrophy type 2J	2017-04-27	criteria provided, single submitter	clinical testing	This variant was observed as part of a predisposition screen in an ostensibly healthy population. A literature search was performed for the gene, cDNA change, and amino acid change (where applicable). No publications were found based on this search. Allele frequency data from public databases was too high to be consistent with this variant causing disease. Therefore, this variant is classified as benign.
Illumina Laboratory Services, Illumina	RCV001129654	SCV001289194	benign	Tibial muscular dystrophy	2017-04-27	criteria provided, single submitter	clinical testing	This variant was observed as part of a predisposition screen in an ostensibly healthy population. A literature search was performed for the gene, cDNA change, and amino acid change (where applicable). No publications were found based on this search. Allele frequency data from public databases was too high to be consistent with this variant causing disease. Therefore, this variant is classified as benign.
Illumina Laboratory Services, Illumina	RCV001129655	SCV001289195	likely benign	Dilated cardiomyopathy 1G	2017-04-27	criteria provided, single submitter	clinical testing	This variant was observed as part of a predisposition screen in an ostensibly healthy population. A literature search was performed for the gene, cDNA change, and amino acid change (where applicable). No publications were found based on this search. Allele frequency data from public databases allowed determination this variant is unlikely to cause disease. Therefore, this variant is classified as likely benign.
Illumina Laboratory Services, Illumina	RCV001132367	SCV001292026	benign	Myopathy, myofibrillar, 9, with early respiratory failure	2017-04-27	criteria provided, single submitter	clinical testing	This variant was observed as part of a predisposition screen in an ostensibly healthy population. A literature search was performed for the gene, cDNA change, and amino acid change (where applicable). No publications were found based on this search. Allele frequency data from public databases was too high to be consistent with this variant causing disease. Therefore, this variant is classified as benign.
Women's Health and Genetics/Laboratory Corporation of America, LabCorp	RCV000040219	SCV001337971	benign	not specified	2021-08-05	criteria provided, single submitter	clinical testing	Variant summary: TTN c.3409G>C (p.Gly1137Arg) results in a non-conservative amino acid change located in the near Z-disk region of the encoded protein sequence. Five of five in-silico tools predict a damaging effect of the variant on protein function. The variant allele was found at a frequency of 0.0022 in 395852 control chromosomes in the gnomAD database (v2.1 and v3.1 datasets), including 1 homozygote. The observed variant frequency is approximately 5.75 fold of the estimated maximal expected allele frequency for a pathogenic variant in TTN causing Dilated Cardiomyopathy phenotype (0.00039), strongly suggesting that the variant is benign. c.3409G>C has been reported in the literature in individuals affected with individuals affected with hypertrophic cardiomyopathy and sudden unexplained death, however in at least one of these patients co-occurring potentially pathogenic variant(s) could explain the phenotype (Lopes_2013, Campuzano_2015). These reports do not support the association of the variant with Dilated Cardiomyopathy. To our knowledge, no experimental evidence demonstrating an impact on protein function has been reported. Eight other submitters have provided clinical-significance assessments for this variant in ClinVar after 2014 without evidence for independent evaluation, and classified the variant as VUS (1x), likely benign (6x) / benign (1x). Based on the evidence outlined above, the variant was classified as benign.
CHEO Genetics Diagnostic Laboratory, Children's Hospital of Eastern Ontario	RCV001798150	SCV002042455	benign	Cardiomyopathy	2019-08-30	criteria provided, single submitter	clinical testing