rs72648946
Variant summary
Our verdict is Benign. The variant received -20 ACMG points: 0P and 20B. BP4_StrongBP6_Very_StrongBS1BS2
The NM_001267550.2(TTN):c.17989G>A(p.Ala5997Thr) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000995 in 1,613,328 control chromosomes in the GnomAD database, including 14 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★).
Frequency
Consequence
NM_001267550.2 missense
Scores
Clinical Significance
Conservation
Publications
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ACMG classification
Our verdict: Benign. The variant received -20 ACMG points.
Variant Effect in Transcripts
ACMG analysis was done for transcript: NM_001267550.2. You can select a different transcript below to see updated ACMG assignments.
RefSeq Transcripts
| Selected | Gene | Transcript | Tags | HGVSc | HGVSp | Effect | Exon Rank | Protein | UniProt |
|---|---|---|---|---|---|---|---|---|---|
| TTN | NM_001267550.2 | MANE Select | c.17989G>A | p.Ala5997Thr | missense | Exon 61 of 363 | NP_001254479.2 | ||
| TTN | NM_001256850.1 | c.17038G>A | p.Ala5680Thr | missense | Exon 59 of 313 | NP_001243779.1 | |||
| TTN | NM_133378.4 | c.14257G>A | p.Ala4753Thr | missense | Exon 58 of 312 | NP_596869.4 |
Ensembl Transcripts
| Selected | Gene | Transcript | Tags | HGVSc | HGVSp | Effect | Exon Rank | Protein | UniProt |
|---|---|---|---|---|---|---|---|---|---|
| TTN | ENST00000589042.5 | TSL:5 MANE Select | c.17989G>A | p.Ala5997Thr | missense | Exon 61 of 363 | ENSP00000467141.1 | ||
| TTN | ENST00000446966.2 | TSL:1 | c.17989G>A | p.Ala5997Thr | missense | Exon 61 of 361 | ENSP00000408004.2 | ||
| TTN | ENST00000436599.2 | TSL:1 | c.17713G>A | p.Ala5905Thr | missense | Exon 59 of 361 | ENSP00000405517.2 |
Frequencies
GnomAD3 genomes 0.00530 AC: 806AN: 152130Hom.: 7 Cov.: 33 show subpopulations
GnomAD2 exomes AF: 0.00132 AC: 329AN: 248614 AF XY: 0.000882 show subpopulations
GnomAD4 exome AF: 0.000547 AC: 799AN: 1461080Hom.: 7 Cov.: 40 AF XY: 0.000461 AC XY: 335AN XY: 726778 show subpopulations
Age Distribution
GnomAD4 genome 0.00530 AC: 807AN: 152248Hom.: 7 Cov.: 33 AF XY: 0.00506 AC XY: 377AN XY: 74434 show subpopulations
Age Distribution
ClinVar
Submissions by phenotype
not specified Benign:7
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.
Ala4753Thr in exon 58 of TTN: This variant is not expected to have clinical sign ificance because it has been identified in 2.0% (65/3204) of African American ch romosomes from a broad population by the NHLBI Exome Sequencing Project (http:// evs.gs.washington.edu/EVS; dbSNP rs72648946).
Autosomal recessive limb-girdle muscular dystrophy type 2J Benign:2
This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score and internal cut-off values, a variant classified as likely benign is not then subjected to further curation. The score for this variant resulted in a classification of likely benign for this disease.
Cardiomyopathy Benign:2
Early-onset myopathy with fatal cardiomyopathy Benign:2
This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score and internal cut-off values, a variant classified as likely benign is not then subjected to further curation. The score for this variant resulted in a classification of likely benign for this disease.
not provided Benign:2
Tibial muscular dystrophy Benign:2
This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score and internal cut-off values, a variant classified as benign is not then subjected to further curation. The score for this variant resulted in a classification of benign for this disease.
Myopathy, myofibrillar, 9, with early respiratory failure Benign:2
This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score and internal cut-off values, a variant classified as benign is not then subjected to further curation. The score for this variant resulted in a classification of benign for this disease.
TTN-related disorder Benign:1
This variant is classified as benign based on ACMG/AMP sequence variant interpretation guidelines (Richards et al. 2015 PMID: 25741868, with internal and published modifications).
Autosomal recessive limb-girdle muscular dystrophy type 2J;C1858763:Dilated cardiomyopathy 1G Benign:1
Dilated cardiomyopathy 1G Benign:1
This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score and internal cut-off values, a variant classified as likely benign is not then subjected to further curation. The score for this variant resulted in a classification of likely benign for this disease.
Cardiovascular phenotype Benign:1
This alteration is classified as 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
Source:
Splicing
Find out detailed SpliceAI scores and Pangolin per-transcript scores at