rs727504687
Variant summary
Our verdict is Likely benign. Variant got -1 ACMG points: 0P and 1B. BP4
The NM_133379.5(TTN):c.14911A>G(p.Ile4971Val) variant causes a missense change. The variant allele was found at a frequency of 0.0000335 in 1,613,402 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 10/15 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★).
Frequency
Genomes: 𝑓 0.000039 ( 0 hom., cov: 32)
Exomes 𝑓: 0.000033 ( 0 hom. )
Consequence
TTN
NM_133379.5 missense
NM_133379.5 missense
Scores
2
3
10
Clinical Significance
Conservation
PhyloP100: 5.87
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 -1 ACMG points.
BP4
?
Computational evidence support a benign effect (MetaRNN=0.37676218).
Transcripts
RefSeq
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | MANE | UniProt |
---|---|---|---|---|---|---|---|
TTN | NM_133379.5 | c.14911A>G | p.Ile4971Val | missense_variant | 46/46 | ENST00000360870.10 | |
TTN | NM_001267550.2 | c.11312-5568A>G | intron_variant | ENST00000589042.5 |
Ensembl
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | TSL | MANE | Appris | UniProt |
---|---|---|---|---|---|---|---|---|---|
TTN | ENST00000360870.10 | c.14911A>G | p.Ile4971Val | missense_variant | 46/46 | 5 | NM_133379.5 | ||
TTN | ENST00000589042.5 | c.11312-5568A>G | intron_variant | 5 | NM_001267550.2 | P1 | |||
TTN-AS1 | ENST00000659121.1 | n.1223+4519T>C | intron_variant, non_coding_transcript_variant |
Frequencies
GnomAD3 genomes ? AF: 0.0000395 AC: 6AN: 151968Hom.: 0 Cov.: 32
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GnomAD3 exomes AF: 0.0000359 AC: 9AN: 250506Hom.: 0 AF XY: 0.0000369 AC XY: 5AN XY: 135344
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GnomAD4 exome AF: 0.0000328 AC: 48AN: 1461316Hom.: 0 Cov.: 34 AF XY: 0.0000385 AC XY: 28AN XY: 726954
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GnomAD4 genome ? AF: 0.0000395 AC: 6AN: 152086Hom.: 0 Cov.: 32 AF XY: 0.0000403 AC XY: 3AN XY: 74352
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ClinVar
Significance: Uncertain significance
Submissions summary: Uncertain:2
Revision: criteria provided, multiple submitters, no conflicts
LINK: link
Submissions by phenotype
not specified Uncertain:1
Uncertain significance, criteria provided, single submitter | clinical testing | Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine | Aug 15, 2013 | The Ile4971Val variant in TTN has not been reported in individuals with cardiomy opathy or in large population studies. Computational analyses are limited or un available for this variant. Additional information is needed to fully assess the clinical significance of the Ile4971Val variant. - |
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 Uncertain:1
Uncertain significance, criteria provided, single submitter | clinical testing | Fulgent Genetics, Fulgent Genetics | Jan 24, 2022 | - - |
Computational scores
Source:
Name
Calibrated prediction
Score
Prediction
BayesDel_addAF
Benign
T
BayesDel_noAF
Benign
Cadd
Benign
Dann
Uncertain
Eigen
Uncertain
Eigen_PC
Uncertain
FATHMM_MKL
Pathogenic
D
LIST_S2
Benign
T
M_CAP
Benign
T
MetaRNN
Benign
T
MetaSVM
Benign
T
MutationTaster
Benign
D;D;D;D;D;D;N
PROVEAN
Benign
N
REVEL
Benign
Sift
Pathogenic
D
Sift4G
Benign
T
Polyphen
D
Vest4
MVP
ClinPred
D
GERP RS
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