rs1553581878
Positions:
Variant summary
Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM2PP2PP3
The NM_001267550.2(TTN):c.80726C>T(p.Pro26909Leu) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000658 in 152,066 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).
Frequency
Genomes: 𝑓 0.0000066 ( 0 hom., cov: 33)
Consequence
TTN
NM_001267550.2 missense
NM_001267550.2 missense
Scores
9
4
3
Clinical Significance
Conservation
PhyloP100: 8.10
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 Uncertain_significance. Variant got 4 ACMG points.
PM2
?
Very rare variant in population databases, with high coverage;
PP2
?
Missense variant where missense usually causes diseases, TTN
PP3
?
MetaRNN computational evidence supports a deleterious effect, 0.774
Transcripts
RefSeq
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | MANE | UniProt |
---|---|---|---|---|---|---|---|
TTN | NM_001267550.2 | c.80726C>T | p.Pro26909Leu | missense_variant | 326/363 | ENST00000589042.5 | |
TTN-AS1 | NR_038272.1 | n.2044-17166G>A | intron_variant, non_coding_transcript_variant |
Ensembl
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | TSL | MANE | Appris | UniProt |
---|---|---|---|---|---|---|---|---|---|
TTN | ENST00000589042.5 | c.80726C>T | p.Pro26909Leu | missense_variant | 326/363 | 5 | NM_001267550.2 | P1 | |
TTN-AS1 | ENST00000659121.1 | n.417-32190G>A | intron_variant, non_coding_transcript_variant |
Frequencies
GnomAD3 genomes ? AF: 0.00000658 AC: 1AN: 152066Hom.: 0 Cov.: 33
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GnomAD4 exome Cov.: 37
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37
GnomAD4 genome ? AF: 0.00000658 AC: 1AN: 152066Hom.: 0 Cov.: 33 AF XY: 0.0000135 AC XY: 1AN XY: 74266
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ClinVar
Significance: Uncertain significance
Submissions summary: Uncertain:1
Revision: criteria provided, single submitter
LINK: link
Submissions by phenotype
Autosomal recessive limb-girdle muscular dystrophy type 2J;C1858763:Dilated cardiomyopathy 1G Uncertain:1
Uncertain significance, criteria provided, single submitter | clinical testing | Invitae | Jun 06, 2017 | - - |
Computational scores
Source:
Name
Calibrated prediction
Score
Prediction
AlphaMissense
Pathogenic
BayesDel_addAF
Uncertain
D
BayesDel_noAF
Uncertain
CADD
Benign
DANN
Benign
Eigen
Pathogenic
Eigen_PC
Pathogenic
FATHMM_MKL
Pathogenic
D
LIST_S2
Pathogenic
D;D;D;.;D;D;D
M_CAP
Benign
D
MetaRNN
Pathogenic
D;D;D;D;D;D;D
MetaSVM
Uncertain
D
MutationTaster
Benign
D;D;D;D;D;D
PrimateAI
Uncertain
T
PROVEAN
Pathogenic
D;D;.;.;D;D;.
REVEL
Pathogenic
Sift
Pathogenic
D;D;.;.;D;D;.
Polyphen
1.0
.;.;.;D;.;.;D
Vest4
MutPred
0.85
.;.;.;Gain of catalytic residue at P25268 (P = 0.07);.;.;Gain of catalytic residue at P25268 (P = 0.07);
MVP
MPC
0.47
ClinPred
D
GERP RS
Splicing
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Calibrated prediction
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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