rs397516449
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Variant summary
Our verdict is Benign. Variant got -7 ACMG points: 0P and 7B. BP4_ModerateBP6BS2
The NM_001276345.2(TNNT2):c.233+6T>C variant causes a splice donor region, intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000391 in 1,613,134 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).
Frequency
Genomes: 𝑓 0.000013 ( 0 hom., cov: 32)
Exomes 𝑓: 0.000042 ( 0 hom. )
Consequence
TNNT2
NM_001276345.2 splice_donor_region, intron
NM_001276345.2 splice_donor_region, intron
Scores
2
Splicing: ADA: 0.002346
2
Clinical Significance
Conservation
PhyloP100: 1.94
Genes affected
TNNT2 (HGNC:11949): (troponin T2, cardiac type) This gene encodes the cardiac isoform of troponin T. The encoded protein is the tropomyosin-binding subunit of the troponin complex, which is located on the thin filament of striated muscles and regulates muscle contraction in response to alterations in intracellular calcium ion concentration. Mutations in this gene have been associated with familial hypertrophic cardiomyopathy as well as with dilated cardiomyopathy. [provided by RefSeq, May 2022]
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ACMG classification
Classification made for transcript
Verdict is Benign. Variant got -7 ACMG points.
BP4
Computational evidence support a benign effect (BayesDel_noAF=-0.41).
BP6
Variant 1-201366832-A-G is Benign according to our data. Variant chr1-201366832-A-G is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 43616.We mark this variant Likely_benign, oryginal submissions are: {Likely_benign=2, Uncertain_significance=6}.
BS2
High AC in GnomAdExome4 at 61 AD gene.
Transcripts
RefSeq
| Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | MANE | Protein | UniProt |
|---|---|---|---|---|---|---|---|---|
| TNNT2 | NM_001276345.2 | c.233+6T>C | splice_donor_region_variant, intron_variant | ENST00000656932.1 | NP_001263274.1 |
Ensembl
| Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | TSL | MANE | Protein | Appris | UniProt |
|---|---|---|---|---|---|---|---|---|---|---|
| TNNT2 | ENST00000656932.1 | c.233+6T>C | splice_donor_region_variant, intron_variant | NM_001276345.2 | ENSP00000499593 | A2 |
Frequencies
GnomAD3 genomes 0.0000132 AC: 2AN: 151270Hom.: 0 Cov.: 32
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GnomAD3 exomes AF: 0.00000398 AC: 1AN: 251462Hom.: 0 AF XY: 0.00 AC XY: 0AN XY: 135906
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GnomAD4 exome AF: 0.0000417 AC: 61AN: 1461864Hom.: 0 Cov.: 34 AF XY: 0.0000468 AC XY: 34AN XY: 727236
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GnomAD4 genome 0.0000132 AC: 2AN: 151270Hom.: 0 Cov.: 32 AF XY: 0.0000135 AC XY: 1AN XY: 73820
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ClinVar
Significance: Conflicting classifications of pathogenicity
Submissions summary: Uncertain:6Benign:2
Revision: criteria provided, conflicting classifications
LINK: link
Submissions by phenotype
Cardiomyopathy Benign:2
| Likely benign, criteria provided, single submitter | clinical testing | All of Us Research Program, National Institutes of Health | May 30, 2024 | - - |
| Likely benign, criteria provided, single submitter | clinical testing | Color Diagnostics, LLC DBA Color Health | Nov 16, 2018 | - - |
not specified Uncertain:1
| Uncertain significance, criteria provided, single submitter | clinical testing | Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine | Dec 26, 2013 | The 203+6T>C variant in TNNT2 has been previously identified by our laboratory i n 1 individual with early-onset DCM and this individual's unaffected parent, but has not been reported in the literature in any other families with DCM or in la rge population studies. This variant is located in the 5' splice region. Computa tional tools do not strongly suggest an impact to splicing. However, this inform ation is not predictive enough to rule out pathogenicity. In summary, additional studies are needed to fully assess the clinical significance of this variant. - |
Dilated cardiomyopathy 1D Uncertain:1
| Uncertain significance, criteria provided, single submitter | clinical testing | Illumina Laboratory Services, Illumina | Jan 12, 2018 | 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. - |
Left ventricular noncompaction cardiomyopathy Uncertain:1
| Uncertain significance, criteria provided, single submitter | clinical testing | Illumina Laboratory Services, Illumina | Jun 14, 2016 | - - |
Cardiomyopathy, familial restrictive, 3 Uncertain:1
| Uncertain significance, criteria provided, single submitter | clinical testing | Illumina Laboratory Services, Illumina | Jan 12, 2018 | 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. - |
Hypertrophic cardiomyopathy 2 Uncertain:1
| Uncertain significance, criteria provided, single submitter | clinical testing | Illumina Laboratory Services, Illumina | Jan 12, 2018 | 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. - |
Dilated cardiomyopathy 1D;C1861864:Hypertrophic cardiomyopathy 2;C2676271:Cardiomyopathy, familial restrictive, 3 Uncertain:1
| Uncertain significance, criteria provided, single submitter | clinical testing | Labcorp Genetics (formerly Invitae), Labcorp | May 15, 2023 | ClinVar contains an entry for this variant (Variation ID: 43616). In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. Variants that disrupt the consensus splice site are a relatively common cause of aberrant splicing (PMID: 17576681, 9536098). Algorithms developed to predict the effect of sequence changes on RNA splicing suggest that this variant is not likely to affect RNA splicing. This variant has not been reported in the literature in individuals affected with TNNT2-related conditions. This variant is present in population databases (rs397516449, gnomAD 0.0009%). This sequence change falls in intron 7 of the TNNT2 gene. It does not directly change the encoded amino acid sequence of the TNNT2 protein. It affects a nucleotide within the consensus splice site. - |
Computational scores
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Name
Calibrated prediction
Score
Prediction
BayesDel_noAF
Benign
CADD
Benign
DANN
Benign
Splicing
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dbscSNV1_ADA
Benign
dbscSNV1_RF
Benign
SpliceAI score (max)
Details are displayed if max score is > 0.2
Find out detailed SpliceAI scores and Pangolin per-transcript scores at