rs727504698
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Variant summary
Our verdict is Likely benign. Variant got -4 ACMG points: 0P and 4B. BP4_ModerateBP6BP7
The NM_001267550.2(TTN):āc.100047A>Cā(p.Thr33349=) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000366 in 1,613,082 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: š 0.000026 ( 0 hom., cov: 33)
Exomes š: 0.000038 ( 0 hom. )
Consequence
TTN
NM_001267550.2 synonymous
NM_001267550.2 synonymous
Scores
2
Clinical Significance
Conservation
PhyloP100: 1.67
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 Likely_benign. Variant got -4 ACMG points.
BP4
?
Computational evidence support a benign effect (BayesDel_noAF=-0.44).
BP6
?
Variant 2-178537062-T-G is Benign according to our data. Variant chr2-178537062-T-G is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 179190.We mark this variant Likely_benign, oryginal submissions are: {Likely_benign=3, Uncertain_significance=1}.
BP7
?
Synonymous conserved (PhyloP=1.67 with no splicing effect.
Transcripts
RefSeq
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | MANE | UniProt |
---|---|---|---|---|---|---|---|
TTN | NM_001267550.2 | c.100047A>C | p.Thr33349= | synonymous_variant | 356/363 | ENST00000589042.5 | |
TTN-AS1 | NR_038272.1 | n.317-299T>G | intron_variant, non_coding_transcript_variant |
Ensembl
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | TSL | MANE | Appris | UniProt |
---|---|---|---|---|---|---|---|---|---|
TTN | ENST00000589042.5 | c.100047A>C | p.Thr33349= | synonymous_variant | 356/363 | 5 | NM_001267550.2 | P1 | |
TTN-AS1 | ENST00000659121.1 | n.416+13426T>G | intron_variant, non_coding_transcript_variant |
Frequencies
GnomAD3 genomes ? AF: 0.0000263 AC: 4AN: 152170Hom.: 0 Cov.: 33
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GnomAD3 exomes AF: 0.000109 AC: 27AN: 247524Hom.: 0 AF XY: 0.000119 AC XY: 16AN XY: 134314
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GnomAD4 exome AF: 0.0000376 AC: 55AN: 1460912Hom.: 0 Cov.: 32 AF XY: 0.0000275 AC XY: 20AN XY: 726694
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ClinVar
Significance: Conflicting classifications of pathogenicity
Submissions summary: Uncertain:1Benign:3
Revision: criteria provided, conflicting classifications
LINK: link
Submissions by phenotype
Cardiomyopathy Uncertain:1
Uncertain significance, criteria provided, single submitter | clinical testing | CHEO Genetics Diagnostic Laboratory, Children's Hospital of Eastern Ontario | Sep 21, 2015 | - - |
not specified Benign:1
Likely benign, criteria provided, single submitter | clinical testing | Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine | Oct 14, 2013 | Thr30781Thr in exon 305 of TTN: This variant is not expected to have clinical si gnificance because it does not alter an amino acid residue and is not located wi thin the splice consensus sequence. Thr30781Thr in exon 305 of TTN (allele freq uency = n/a) - |
Autosomal recessive limb-girdle muscular dystrophy type 2J;C1858763:Dilated cardiomyopathy 1G Benign:1
Likely benign, criteria provided, single submitter | clinical testing | Invitae | Jan 04, 2024 | - - |
Cardiovascular phenotype Benign:1
Likely benign, criteria provided, single submitter | clinical testing | Ambry Genetics | Jan 17, 2024 | 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. - |
Computational scores
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Name
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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