2-178556967-A-G
Variant summary
Our verdict is Benign. The variant received -20 ACMG points: 0P and 20B. BP4_StrongBP6_Very_StrongBA1
The NM_001267550.2(TTN):c.88187T>C(p.Ile29396Thr) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.275 in 1,613,436 control chromosomes in the GnomAD database, including 73,989 homozygotes. In-silico tool predicts a benign outcome for this variant. 16/19 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. I29396L) has been classified 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.88187T>C | p.Ile29396Thr | missense | Exon 330 of 363 | NP_001254479.2 | ||
| TTN | NM_001256850.1 | c.83264T>C | p.Ile27755Thr | missense | Exon 280 of 313 | NP_001243779.1 | |||
| TTN | NM_133378.4 | c.80483T>C | p.Ile26828Thr | missense | Exon 279 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.88187T>C | p.Ile29396Thr | missense | Exon 330 of 363 | ENSP00000467141.1 | ||
| TTN | ENST00000446966.2 | TSL:1 | c.88031T>C | p.Ile29344Thr | missense | Exon 328 of 361 | ENSP00000408004.2 | ||
| TTN | ENST00000436599.2 | TSL:1 | c.87911T>C | p.Ile29304Thr | missense | Exon 328 of 361 | ENSP00000405517.2 |
Frequencies
GnomAD3 genomes 0.360 AC: 54733AN: 151894Hom.: 11755 Cov.: 32 show subpopulations
GnomAD2 exomes AF: 0.351 AC: 87123AN: 248424 AF XY: 0.348 show subpopulations
GnomAD4 exome AF: 0.266 AC: 389351AN: 1461424Hom.: 62185 Cov.: 36 AF XY: 0.272 AC XY: 197456AN XY: 726996 show subpopulations
Age Distribution
GnomAD4 genome 0.361 AC: 54843AN: 152012Hom.: 11804 Cov.: 32 AF XY: 0.371 AC XY: 27533AN XY: 74308 show subpopulations
Age Distribution
ClinVar
Submissions by phenotype
not specified Benign:10
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.
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 benign is not then subjected to further curation. The score for this variant resulted in a classification of benign for this disease.
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 benign is not then subjected to further curation. The score for this variant resulted in a classification of 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.
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 benign is not then subjected to further curation. The score for this variant resulted in a classification of 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