2-178527550-A-G
Variant summary
Our verdict is Benign. Variant got -12 ACMG points: 1P and 13B. PP2BP4_StrongBP6BS1BS2
The NM_001267550.2(TTN):āc.107576T>Cā(p.Met35859Thr) variant causes a missense change. The variant allele was found at a frequency of 0.00128 in 1,614,036 control chromosomes in the GnomAD database, including 18 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. M35859I) has been classified as Uncertain significance.
Frequency
Consequence
NM_001267550.2 missense
Scores
Clinical Significance
Conservation
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ACMG classification
Verdict is Benign. Variant got -12 ACMG points.
Transcripts
RefSeq
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | MANE | UniProt |
---|---|---|---|---|---|---|---|
TTN | NM_001267550.2 | c.107576T>C | p.Met35859Thr | missense_variant | 362/363 | ENST00000589042.5 | |
TTN-AS1 | NR_038272.1 | n.219+3914A>G | intron_variant, non_coding_transcript_variant |
Ensembl
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | TSL | MANE | Appris | UniProt |
---|---|---|---|---|---|---|---|---|---|
TTN | ENST00000589042.5 | c.107576T>C | p.Met35859Thr | missense_variant | 362/363 | 5 | NM_001267550.2 | P1 | |
TTN-AS1 | ENST00000659121.1 | n.416+3914A>G | intron_variant, non_coding_transcript_variant |
Frequencies
GnomAD3 genomes AF: 0.000985 AC: 150AN: 152240Hom.: 0 Cov.: 33
GnomAD3 exomes AF: 0.00194 AC: 483AN: 249108Hom.: 5 AF XY: 0.00238 AC XY: 321AN XY: 135138
GnomAD4 exome AF: 0.00131 AC: 1911AN: 1461678Hom.: 18 Cov.: 32 AF XY: 0.00163 AC XY: 1186AN XY: 727120
GnomAD4 genome AF: 0.000985 AC: 150AN: 152358Hom.: 0 Cov.: 33 AF XY: 0.00113 AC XY: 84AN XY: 74500
ClinVar
Submissions by phenotype
not provided Benign:6
Benign, criteria provided, single submitter | clinical testing | Athena Diagnostics | Mar 28, 2018 | - - |
Likely benign, no assertion criteria provided | clinical testing | Laboratory of Diagnostic Genome Analysis, Leiden University Medical Center (LUMC) | - | - - |
Benign, criteria provided, single submitter | clinical testing | CeGaT Center for Human Genetics Tuebingen | Jul 01, 2024 | TTN: BS1, BS2 - |
Likely benign, criteria provided, single submitter | research | Biesecker Lab/Clinical Genomics Section, National Institutes of Health | Jun 24, 2013 | - - |
Likely benign, no assertion criteria provided | clinical testing | Genome Diagnostics Laboratory, University Medical Center Utrecht | - | - - |
Likely benign, no assertion criteria provided | clinical testing | Clinical Genetics DNA and cytogenetics Diagnostics Lab, Erasmus MC, Erasmus Medical Center | - | - - |
not specified Benign:5
Benign, criteria provided, single submitter | clinical testing | Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine | Oct 12, 2017 | p.Met33291Thr variant in exon 311 of TTN: This variant is not expected to have c linical significance because it has been identified in 0.9% (275/30782) of South Asian chromosomes by the Genome Aggregation Database (gnomAD, http://gnomAD.bro adinstitute.org; dbSNP rs72629793). ACMG/AMP Criteria applied: BA1(Richards 2015 ). - |
Benign, criteria provided, single submitter | clinical testing | Women's Health and Genetics/Laboratory Corporation of America, LabCorp | Apr 20, 2021 | Variant summary: TTN c.99872T>C (p.Met33291Thr) results in a non-conservative amino acid change located in the M-band region (cardiodb.org) of the encoded protein sequence. Three of five in-silico tools predict a damaging effect of the variant on protein function. The variant allele was found at a frequency of 0.0019 in 249108 control chromosomes, predominantly at a frequency of 0.0088 within the South Asian subpopulation in the gnomAD database, including 4 homozygotes. The observed variant frequency within South Asian control individuals in the gnomAD database is approximately 22.5- fold the estimated maximal expected allele frequency for a pathogenic variant in TTN causing Dilated Cardiomyopathy phenotype (0.00039), strongly suggesting that the variant is a benign polymorphism found primarily in populations of South Asian origin. c.99872T>C has been reported in the literature in individuals affected with Dilated Cardiomyopathy (e.g. Taylor_2011). These reports do not provide unequivocal conclusions about association of the variant with Dilated Cardiomyopathy. To our knowledge, no experimental evidence demonstrating an impact on protein function has been reported. 11 other clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar after 2014 without evidence for independent evaluation, citing the variant as benign/likely benign (n=9) and uncertain significance (n=2). Based on the evidence outlined above, the variant was classified as benign. - |
Benign, no assertion criteria provided | clinical testing | Clinical Genetics, Academic Medical Center | - | - - |
Benign, criteria provided, single submitter | clinical testing | GeneDx | Aug 16, 2016 | 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. - |
Likely benign, criteria provided, single submitter | clinical testing | Eurofins Ntd Llc (ga) | Aug 02, 2016 | - - |
Dilated cardiomyopathy 1G Benign:2
Benign, criteria provided, single submitter | clinical testing | Illumina Laboratory Services, Illumina | Apr 27, 2017 | 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). Publications were found based on this search. The evidence from the literature, in combination with allele frequency data from public databases where available, was sufficient to rule this variant out of causing disease. Therefore, this variant is classified as benign. - |
Benign, criteria provided, single submitter | clinical testing | Mendelics | May 28, 2019 | - - |
Autosomal recessive limb-girdle muscular dystrophy type 2J Uncertain:1
Uncertain significance, criteria provided, single submitter | clinical testing | Illumina Laboratory Services, Illumina | Apr 27, 2017 | 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). Publications were found based on this search. However, the evidence from the literature, in combination with allele frequency data from public databases where available, was not sufficient to rule this variant in or out of causing disease. Therefore, this variant is classified as a variant of unknown significance. - |
Early-onset myopathy with fatal cardiomyopathy Uncertain:1
Uncertain significance, criteria provided, single submitter | clinical testing | Illumina Laboratory Services, Illumina | Apr 27, 2017 | 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. - |
TTN-related disorder Benign:1
Benign, criteria provided, single submitter | clinical testing | PreventionGenetics, part of Exact Sciences | May 19, 2021 | This variant is classified as benign based on ACMG/AMP sequence variant interpretation guidelines (Richards et al. 2015 PMID: 25741868, with internal and published modifications). - |
Autosomal recessive limb-girdle muscular dystrophy type 2J;C1858763:Dilated cardiomyopathy 1G Benign:1
Benign, criteria provided, single submitter | clinical testing | Invitae | Jan 31, 2024 | - - |
Cardiomyopathy Benign:1
Benign, criteria provided, single submitter | clinical testing | CHEO Genetics Diagnostic Laboratory, Children's Hospital of Eastern Ontario | Nov 28, 2017 | - - |
Myopathy, myofibrillar, 9, with early respiratory failure Benign:1
Benign, criteria provided, single submitter | clinical testing | Illumina Laboratory Services, Illumina | Apr 27, 2017 | 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). Publications were found based on this search. The evidence from the literature, in combination with allele frequency data from public databases where available, was sufficient to rule this variant out of causing disease. Therefore, this variant is classified as benign. - |
Tibial muscular dystrophy Benign:1
Benign, criteria provided, single submitter | clinical testing | Illumina Laboratory Services, Illumina | Apr 27, 2017 | 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. - |
Primary dilated cardiomyopathy Benign:1
Likely benign, criteria provided, single submitter | research | Genetics and Genomics Program, Sidra Medicine | - | - - |
Cardiovascular phenotype Benign:1
Benign, criteria provided, single submitter | clinical testing | Ambry Genetics | May 29, 2020 | General population or subpopulation frequency is too high to be a pathogenic mutation based on disease/syndrome prevalence and penetrance - |
Computational scores
Source:
Splicing
Find out detailed SpliceAI scores and Pangolin per-transcript scores at