rs771366227
Variant summary
Our verdict is Uncertain significance. Variant got 1 ACMG points: 1P and 0B. PM4_Supporting
The NM_001267550.2(TTN):c.103924_103926del(p.Pro34642del) variant causes a inframe deletion change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.0000452 in 1,613,956 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★★).
Frequency
Genomes: 𝑓 0.000013 ( 0 hom., cov: 32)
Exomes 𝑓: 0.000049 ( 0 hom. )
Consequence
TTN
NM_001267550.2 inframe_deletion
NM_001267550.2 inframe_deletion
Scores
Not classified
Clinical Significance
Conservation
PhyloP100: 9.97
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 1 ACMG points.
PM4
?
Nonframeshift variant in NON repetitive region in NM_001267550.2. Strenght limited to Supporting due to length of the change: 1aa.
Transcripts
RefSeq
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | MANE | UniProt |
---|---|---|---|---|---|---|---|
TTN | NM_001267550.2 | c.103924_103926del | p.Pro34642del | inframe_deletion | 358/363 | ENST00000589042.5 | |
TTN-AS1 | NR_038272.1 | n.220-3041_220-3039del | intron_variant, non_coding_transcript_variant |
Ensembl
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | TSL | MANE | Appris | UniProt |
---|---|---|---|---|---|---|---|---|---|
TTN | ENST00000589042.5 | c.103924_103926del | p.Pro34642del | inframe_deletion | 358/363 | 5 | NM_001267550.2 | P1 | |
TTN-AS1 | ENST00000659121.1 | n.416+9055_416+9057del | intron_variant, non_coding_transcript_variant |
Frequencies
GnomAD3 genomes ? AF: 0.0000131 AC: 2AN: 152178Hom.: 0 Cov.: 32
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GnomAD3 exomes AF: 0.00000803 AC: 2AN: 249064Hom.: 0 AF XY: 0.00 AC XY: 0AN XY: 135112
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GnomAD4 exome AF: 0.0000486 AC: 71AN: 1461660Hom.: 0 AF XY: 0.0000481 AC XY: 35AN XY: 727112
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GnomAD4 genome ? AF: 0.0000131 AC: 2AN: 152296Hom.: 0 Cov.: 32 AF XY: 0.00 AC XY: 0AN XY: 74460
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ClinVar
Significance: Uncertain significance
Submissions summary: Uncertain:10
Revision: criteria provided, multiple submitters, no conflicts
LINK: link
Submissions by phenotype
not provided Uncertain:2
Uncertain significance, criteria provided, single submitter | clinical testing | Revvity Omics, Revvity | Mar 25, 2019 | - - |
Uncertain significance, criteria provided, single submitter | clinical testing | AiLife Diagnostics, AiLife Diagnostics | Jan 17, 2022 | - - |
not specified Uncertain:1
Uncertain significance, criteria provided, single submitter | clinical testing | Athena Diagnostics | Feb 09, 2017 | - - |
Early-onset myopathy with fatal cardiomyopathy Uncertain:1
Uncertain significance, criteria provided, single submitter | clinical testing | Illumina Laboratory Services, Illumina | Jun 14, 2016 | - - |
Dilated Cardiomyopathy, Dominant Uncertain:1
Uncertain significance, criteria provided, single submitter | clinical testing | Illumina Laboratory Services, Illumina | Jun 14, 2016 | - - |
Limb-Girdle Muscular Dystrophy, Recessive Uncertain:1
Uncertain significance, criteria provided, single submitter | clinical testing | Illumina Laboratory Services, Illumina | Jun 14, 2016 | - - |
Tibial muscular dystrophy Uncertain:1
Uncertain significance, criteria provided, single submitter | clinical testing | Illumina Laboratory Services, Illumina | Jun 14, 2016 | - - |
Myopathy, myofibrillar, 9, with early respiratory failure Uncertain:1
Uncertain significance, criteria provided, single submitter | clinical testing | Illumina Laboratory Services, Illumina | Jun 14, 2016 | - - |
Hypertrophic cardiomyopathy Uncertain:1
Uncertain significance, criteria provided, single submitter | clinical testing | Illumina Laboratory Services, Illumina | Jun 14, 2016 | - - |
Cardiovascular phenotype Uncertain:1
Uncertain significance, criteria provided, single submitter | clinical testing | Ambry Genetics | Nov 13, 2023 | The c.76729_76731delCCT variant (also known as p.P25577del) is located in coding exon 185 of the TTN gene. This variant results from an in-frame CCT deletion at nucleotide positions 76729 to 76731. This results in the in-frame deletion of a proline at codon 25577. This alteration, noted as NM_001267550.1: p.P34642del, has been reported in a dilated cardiomyopathy (DCM) cohort (Mazzarotto F et al. Circulation, 2020 Feb;141:387-398). This amino acid position is highly conserved in available vertebrate species. Since supporting evidence is limited at this time, the clinical significance of this alteration remains unclear. - |
Computational scores
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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