chr14-23426793-A-G
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Variant summary
Our verdict is Likely benign. Variant got -4 ACMG points: 0P and 4B. BP4_ModerateBP6BP7
The NM_000257.4(MYH7):āc.2028T>Cā(p.Asn676=) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000533 in 1,614,218 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).
Frequency
Genomes: š 0.000059 ( 0 hom., cov: 32)
Exomes š: 0.000053 ( 0 hom. )
Consequence
MYH7
NM_000257.4 synonymous
NM_000257.4 synonymous
Scores
2
Clinical Significance
Conservation
PhyloP100: 2.01
Genes affected
MYH7 (HGNC:7577): (myosin heavy chain 7) Muscle myosin is a hexameric protein containing 2 heavy chain subunits, 2 alkali light chain subunits, and 2 regulatory light chain subunits. This gene encodes the beta (or slow) heavy chain subunit of cardiac myosin. It is expressed predominantly in normal human ventricle. It is also expressed in skeletal muscle tissues rich in slow-twitch type I muscle fibers. Changes in the relative abundance of this protein and the alpha (or fast) heavy subunit of cardiac myosin correlate with the contractile velocity of cardiac muscle. Its expression is also altered during thyroid hormone depletion and hemodynamic overloading. Mutations in this gene are associated with familial hypertrophic cardiomyopathy, myosin storage myopathy, dilated cardiomyopathy, and Laing distal myopathy. [provided by RefSeq, May 2022]
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ACMG classification
Classification made for transcript
Verdict is Likely_benign. Variant got -4 ACMG points.
BP4
Computational evidence support a benign effect (BayesDel_noAF=-0.46).
BP6
Variant 14-23426793-A-G is Benign according to our data. Variant chr14-23426793-A-G is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 312910.We mark this variant Likely_benign, oryginal submissions are: {Likely_benign=5, Uncertain_significance=4}. Variant chr14-23426793-A-G is described in Lovd as [Benign].
BP7
Synonymous conserved (PhyloP=2.01 with no splicing effect.
Transcripts
RefSeq
| Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | MANE | UniProt |
|---|---|---|---|---|---|---|---|
| MYH7 | NM_000257.4 | c.2028T>C | p.Asn676= | synonymous_variant | 18/40 | ENST00000355349.4 | |
| MYH7 | NM_001407004.1 | c.2028T>C | p.Asn676= | synonymous_variant | 17/39 |
Ensembl
| Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | TSL | MANE | Appris | UniProt |
|---|---|---|---|---|---|---|---|---|---|
| MYH7 | ENST00000355349.4 | c.2028T>C | p.Asn676= | synonymous_variant | 18/40 | 1 | NM_000257.4 | P1 |
Frequencies
GnomAD3 genomes 0.0000591 AC: 9AN: 152222Hom.: 0 Cov.: 32
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GnomAD3 exomes AF: 0.0000199 AC: 5AN: 251490Hom.: 0 AF XY: 0.0000294 AC XY: 4AN XY: 135922
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GnomAD4 exome AF: 0.0000527 AC: 77AN: 1461878Hom.: 0 Cov.: 32 AF XY: 0.0000536 AC XY: 39AN XY: 727240
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GnomAD4 genome 0.0000591 AC: 9AN: 152340Hom.: 0 Cov.: 32 AF XY: 0.0000134 AC XY: 1AN XY: 74492
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ClinVar
Significance: Conflicting classifications of pathogenicity
Submissions summary: Uncertain:4Benign:5
Revision: criteria provided, conflicting classifications
LINK: link
Submissions by phenotype
Cardiomyopathy Benign:2
| Likely benign, criteria provided, single submitter | clinical testing | Color Diagnostics, LLC DBA Color Health | Oct 21, 2018 | - - |
| Likely benign, criteria provided, single submitter | clinical testing | CHEO Genetics Diagnostic Laboratory, Children's Hospital of Eastern Ontario | Nov 25, 2022 | - - |
Myosin storage myopathy Uncertain:1
| Uncertain significance, criteria provided, single submitter | clinical testing | Illumina Laboratory Services, Illumina | Jan 12, 2018 | 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, this variant could not be ruled out of causing disease and therefore its association with disease required further investigation. A literature search was performed for the gene, cDNA change, and amino acid change (if applicable). No publications were found based on this search. This variant was therefore classified as a variant of unknown significance for this disease. - |
Dilated Cardiomyopathy, Dominant Uncertain:1
| Uncertain significance, criteria provided, single submitter | clinical testing | Illumina Laboratory Services, Illumina | Jun 14, 2016 | - - |
Left ventricular noncompaction cardiomyopathy Uncertain:1
| Uncertain significance, criteria provided, single submitter | clinical testing | Illumina Laboratory Services, Illumina | Jun 14, 2016 | - - |
Hypertrophic cardiomyopathy 1 Uncertain:1
| Uncertain significance, criteria provided, single submitter | clinical testing | Illumina Laboratory Services, Illumina | Jan 12, 2018 | 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, this variant could not be ruled out of causing disease and therefore its association with disease required further investigation. A literature search was performed for the gene, cDNA change, and amino acid change (if applicable). No publications were found based on this search. This variant was therefore classified as a variant of unknown significance for this disease. - |
MYH7-related skeletal myopathy Benign:1
| Likely benign, criteria provided, single submitter | clinical testing | Illumina Laboratory Services, Illumina | Jan 12, 2018 | 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. - |
Hypertrophic cardiomyopathy Benign:1
| Likely benign, criteria provided, single submitter | clinical testing | Labcorp Genetics (formerly Invitae), Labcorp | Dec 21, 2023 | - - |
Cardiovascular phenotype Benign:1
| Likely benign, criteria provided, single submitter | clinical testing | Ambry Genetics | May 06, 2022 | This alteration is classified as likely benign based on a combination of the following: seen in unaffected individuals, 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
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Name
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BayesDel_noAF
Benign
CADD
Benign
DANN
Benign
Splicing
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Details are displayed if max score is > 0.2
Find out detailed SpliceAI scores and Pangolin per-transcript scores at