2-178542856-C-T
Variant summary
Our verdict is Benign. Variant got -11 ACMG points: 1P and 12B. PP2BP4_StrongBP6_Very_Strong
The NM_001267550.2(TTN):c.96998G>A(p.Arg32333His) variant causes a missense change. The variant allele was found at a frequency of 0.000222 in 1,613,734 control chromosomes in the GnomAD database, including 1 homozygotes. In-silico tool predicts a benign outcome for this variant. 11/19 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R32333C) 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 -11 ACMG points.
Transcripts
RefSeq
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | MANE | UniProt |
---|---|---|---|---|---|---|---|
TTN | NM_001267550.2 | c.96998G>A | p.Arg32333His | missense_variant | 348/363 | ENST00000589042.5 | |
TTN-AS1 | NR_038272.1 | n.2043+495C>T | intron_variant, non_coding_transcript_variant |
Ensembl
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | TSL | MANE | Appris | UniProt |
---|---|---|---|---|---|---|---|---|---|
TTN | ENST00000589042.5 | c.96998G>A | p.Arg32333His | missense_variant | 348/363 | 5 | NM_001267550.2 | P1 | |
TTN-AS1 | ENST00000659121.1 | n.416+19220C>T | intron_variant, non_coding_transcript_variant |
Frequencies
GnomAD3 genomes AF: 0.000940 AC: 143AN: 152062Hom.: 0 Cov.: 32
GnomAD3 exomes AF: 0.000351 AC: 87AN: 247604Hom.: 1 AF XY: 0.000268 AC XY: 36AN XY: 134278
GnomAD4 exome AF: 0.000146 AC: 213AN: 1461554Hom.: 1 Cov.: 32 AF XY: 0.000129 AC XY: 94AN XY: 727058
GnomAD4 genome AF: 0.000953 AC: 145AN: 152180Hom.: 0 Cov.: 32 AF XY: 0.000941 AC XY: 70AN XY: 74392
ClinVar
Submissions by phenotype
not provided Benign:5
Likely benign, no assertion criteria provided | clinical testing | Clinical Genetics, Academic Medical Center | - | - - |
Likely benign, no assertion criteria provided | clinical testing | Diagnostic Laboratory, Department of Genetics, University Medical Center Groningen | - | - - |
Likely benign, criteria provided, single submitter | clinical testing | GeneDx | Jun 05, 2020 | This variant is associated with the following publications: (PMID: 24503780) - |
Likely benign, no assertion criteria provided | clinical testing | Clinical Genetics DNA and cytogenetics Diagnostics Lab, Erasmus MC, Erasmus Medical Center | - | - - |
Likely benign, no assertion criteria provided | clinical testing | Genome Diagnostics Laboratory, University Medical Center Utrecht | - | - - |
not specified Benign:3
Likely benign, criteria provided, single submitter | clinical testing | Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine | Apr 18, 2012 | Arg29765His in Exon 297 of TTN: This variant is not expected to have clinical si gnificance because it has been identified in 0.5% (17/3292) of African American chromosomes from a broad population by the NHLBI Exome Sequencing Project (http: //evs.gs.washington.edu/EVS; dbSNP rs138846756). Arg29765His in Exon 297 of TTN (allele frequency = 0.5%, 17/3292; dbSNP rs138846756) ** - |
Likely benign, criteria provided, single submitter | clinical testing | Eurofins Ntd Llc (ga) | Jun 11, 2015 | - - |
Likely benign, criteria provided, single submitter | clinical testing | Women's Health and Genetics/Laboratory Corporation of America, LabCorp | Mar 29, 2022 | Variant summary: TTN c.89294G>A (p.Arg29765His) results in a non-conservative amino acid change located in the A-band domain of the encoded protein sequence. Four of five in-silico tools predict a damaging effect of the variant on protein function. The variant allele was found at a frequency of 0.00035 in 247604 control chromosomes, predominantly at a frequency of 0.004 within the African or African-American subpopulation in the gnomAD database, including 1 homozygotes. The observed variant frequency within African or African-American control individuals in the gnomAD database is approximately 10 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 a benign polymorphism found primarily in populations of African or African-American origin. c.89294G>A has been reported in the literature in individuals affected with Dilated Cardiomyopathy, HCM and sudden unexplained death, without strong evidence for causality (Pugh_2014, Campuzano_2015, Burstein_2021). 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. Six clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar after 2014 without evidence for independent evaluation. All laboratories classified the variant as benign/likely benign. Based on the evidence outlined above, the variant was classified as likely benign. - |
Cardiovascular phenotype Benign:2
Likely benign, criteria provided, single submitter | clinical testing | Ambry Genetics | Jul 05, 2018 | Subpopulation frequency in support of benign classification - |
Likely benign, criteria provided, single submitter | clinical testing | Ambry Genetics | May 25, 2023 | This alteration is classified as likely benign based on a combination of the following: seen in unaffected individuals, population frequency, intact protein function, lack of segregation with disease, co-occurrence, RNA analysis, in silico models, amino acid conservation, lack of disease association in case-control studies, and/or the mechanism of disease or impacted region is inconsistent with a known cause of pathogenicity. - |
Autosomal recessive limb-girdle muscular dystrophy type 2J Benign:1
Benign, criteria provided, single submitter | clinical testing | Genome-Nilou Lab | Sep 10, 2021 | - - |
TTN-related disorder Benign:1
Likely benign, criteria provided, single submitter | clinical testing | PreventionGenetics, part of Exact Sciences | Feb 03, 2021 | 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). - |
Autosomal recessive limb-girdle muscular dystrophy type 2J;C1858763:Dilated cardiomyopathy 1G Benign:1
Likely 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 | Dec 22, 2020 | - - |
Early-onset myopathy with fatal cardiomyopathy Benign:1
Benign, criteria provided, single submitter | clinical testing | Genome-Nilou Lab | Sep 10, 2021 | - - |
Tibial muscular dystrophy Benign:1
Benign, criteria provided, single submitter | clinical testing | Genome-Nilou Lab | Sep 10, 2021 | - - |
Myopathy, myofibrillar, 9, with early respiratory failure Benign:1
Benign, criteria provided, single submitter | clinical testing | Genome-Nilou Lab | Sep 10, 2021 | - - |
Computational scores
Source:
Splicing
Find out detailed SpliceAI scores and Pangolin per-transcript scores at