rs143265948
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Variant summary
Our verdict is Benign. Variant got -13 ACMG points: 0P and 13B. BP4_StrongBP6_Very_StrongBP7
The NM_001267550.2(TTN):c.6162C>T(p.Ala2054=) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000359 in 1,613,856 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 Likely benign (★★).
Frequency
Genomes: 𝑓 0.000039 ( 0 hom., cov: 32)
Exomes 𝑓: 0.000036 ( 0 hom. )
Consequence
TTN
NM_001267550.2 synonymous
NM_001267550.2 synonymous
Scores
2
Clinical Significance
Conservation
PhyloP100: -2.22
Genes affected
TTN (HGNC:12403): (titin) This gene encodes a large abundant protein of striated muscle. The product of this gene is divided into two regions, a N-terminal I-band and a C-terminal A-band. The I-band, which is the elastic part of the molecule, contains two regions of tandem immunoglobulin domains on either side of a PEVK region that is rich in proline, glutamate, valine and lysine. The A-band, which is thought to act as a protein-ruler, contains a mixture of immunoglobulin and fibronectin repeats, and possesses kinase activity. An N-terminal Z-disc region and a C-terminal M-line region bind to the Z-line and M-line of the sarcomere, respectively, so that a single titin molecule spans half the length of a sarcomere. Titin also contains binding sites for muscle associated proteins so it serves as an adhesion template for the assembly of contractile machinery in muscle cells. It has also been identified as a structural protein for chromosomes. Alternative splicing of this gene results in multiple transcript variants. Considerable variability exists in the I-band, the M-line and the Z-disc regions of titin. Variability in the I-band region contributes to the differences in elasticity of different titin isoforms and, therefore, to the differences in elasticity of different muscle types. Mutations in this gene are associated with familial hypertrophic cardiomyopathy 9, and autoantibodies to titin are produced in patients with the autoimmune disease scleroderma. [provided by RefSeq, Feb 2012]
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ACMG classification
Classification made for transcript
Verdict is Benign. Variant got -13 ACMG points.
BP4
?
Computational evidence support a benign effect (BayesDel_noAF=-0.92).
BP6
?
Variant 2-178775702-G-A is Benign according to our data. Variant chr2-178775702-G-A is described in ClinVar as [Likely_benign]. Clinvar id is 166313.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr2-178775702-G-A is described in Lovd as [Likely_benign].
BP7
?
Synonymous conserved (PhyloP=-2.22 with no splicing effect.
Transcripts
RefSeq
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | MANE | UniProt |
---|---|---|---|---|---|---|---|
TTN | NM_001267550.2 | c.6162C>T | p.Ala2054= | synonymous_variant | 28/363 | ENST00000589042.5 | |
TTN | NM_133379.5 | c.6162C>T | p.Ala2054= | synonymous_variant | 28/46 | ENST00000360870.10 |
Ensembl
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | TSL | MANE | Appris | UniProt |
---|---|---|---|---|---|---|---|---|---|
TTN | ENST00000589042.5 | c.6162C>T | p.Ala2054= | synonymous_variant | 28/363 | 5 | NM_001267550.2 | P1 | |
TTN | ENST00000360870.10 | c.6162C>T | p.Ala2054= | synonymous_variant | 28/46 | 5 | NM_133379.5 | ||
TTN-AS1 | ENST00000659121.1 | n.3129G>A | non_coding_transcript_exon_variant | 12/13 |
Frequencies
GnomAD3 genomes ? AF: 0.0000395 AC: 6AN: 152038Hom.: 0 Cov.: 32
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GnomAD3 exomes AF: 0.0000320 AC: 8AN: 250360Hom.: 0 AF XY: 0.0000444 AC XY: 6AN XY: 135266
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GnomAD4 exome AF: 0.0000356 AC: 52AN: 1461818Hom.: 0 Cov.: 33 AF XY: 0.0000385 AC XY: 28AN XY: 727216
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GnomAD4 genome ? AF: 0.0000395 AC: 6AN: 152038Hom.: 0 Cov.: 32 AF XY: 0.0000135 AC XY: 1AN XY: 74266
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ClinVar
Significance: Benign/Likely benign
Submissions summary: Benign:11
Revision: criteria provided, multiple submitters, no conflicts
LINK: link
Submissions by phenotype
not specified Benign:3
Likely benign, criteria provided, single submitter | clinical testing | PreventionGenetics, part of Exact Sciences | - | - - |
Likely benign, criteria provided, single submitter | clinical testing | Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine | Mar 19, 2012 | Ala2054Ala in exon 28 of TTN: This variant is not expected to have clinical sign ificance because it does not alter an amino acid residue and is not located with in the splice consensus sequence. It has been identified in 1/7020 European Amer ican chromosomes from a broad population by the NHLBI Exome Sequencing Project ( http://evs.gs.washington.edu/EVS; dbSNP rs143265948). Ala2054Ala in exon 28 of TTN (rs143265948; allele frequency = 1/7020) ** - |
Benign, criteria provided, single submitter | clinical testing | GeneDx | Jul 16, 2015 | 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. - |
Autosomal recessive limb-girdle muscular dystrophy type 2J Benign:1
Benign, criteria provided, single submitter | clinical testing | Genome-Nilou Lab | Sep 10, 2021 | - - |
Autosomal recessive limb-girdle muscular dystrophy type 2J;C1858763:Dilated cardiomyopathy 1G Benign:1
Likely benign, criteria provided, single submitter | clinical testing | Invitae | Oct 04, 2023 | - - |
Early-onset myopathy with fatal cardiomyopathy Benign:1
Benign, criteria provided, single submitter | clinical testing | Genome-Nilou Lab | Sep 10, 2021 | - - |
Autosomal recessive limb-girdle muscular dystrophy type 2J;C1838244:Tibial muscular dystrophy;C1858763:Dilated cardiomyopathy 1G;C1861065:Hypertrophic cardiomyopathy 9;C1863599:Myopathy, myofibrillar, 9, with early respiratory failure;C2673677:Early-onset myopathy with fatal cardiomyopathy Benign:1
Likely benign, criteria provided, single submitter | clinical testing | Fulgent Genetics, Fulgent Genetics | Jul 26, 2021 | - - |
not provided Benign:1
Likely benign, criteria provided, single submitter | clinical testing | CeGaT Center for Human Genetics Tuebingen | Nov 01, 2023 | TTN: BP4, BP7 - |
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 | - - |
Cardiovascular phenotype Benign:1
Likely benign, criteria provided, single submitter | clinical testing | Ambry Genetics | May 15, 2013 | This alteration is classified as likely benign based on a combination of the following: 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. - |
Computational scores
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Name
Calibrated prediction
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BayesDel_noAF
Benign
CADD
Benign
DANN
Benign
Splicing
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SpliceAI score (max)
Details are displayed if max score is > 0.2
Find out detailed SpliceAI scores and Pangolin per-transcript scores at