rs727503244
Variant summary
Our verdict is Uncertain significance. Variant got 5 ACMG points: 5P and 0B. PM1PP2PP3_Moderate
The NM_000257.4(MYH7):c.4283T>C(p.Leu1428Ser) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.0000719 in 1,612,342 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 0.000059 ( 0 hom., cov: 33)
Exomes 𝑓: 0.000073 ( 0 hom. )
Consequence
MYH7
NM_000257.4 missense
NM_000257.4 missense
Scores
13
6
1
Clinical Significance
Conservation
PhyloP100: 9.06
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 Uncertain_significance. Variant got 5 ACMG points.
PM1
?
In a hotspot region, there are 4 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 10 uncertain in NM_000257.4
PP2
?
Missense variant where missense usually causes diseases, MYH7
PP3
?
MetaRNN computational evidence supports a deleterious effect, 0.93
Transcripts
RefSeq
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | MANE | UniProt |
---|---|---|---|---|---|---|---|
MYH7 | NM_000257.4 | c.4283T>C | p.Leu1428Ser | missense_variant | 31/40 | ENST00000355349.4 | |
MHRT | NR_126491.1 | n.854A>G | non_coding_transcript_exon_variant | 6/6 | |||
MYH7 | NM_001407004.1 | c.4283T>C | p.Leu1428Ser | missense_variant | 30/39 |
Ensembl
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | TSL | MANE | Appris | UniProt |
---|---|---|---|---|---|---|---|---|---|
MYH7 | ENST00000355349.4 | c.4283T>C | p.Leu1428Ser | missense_variant | 31/40 | 1 | NM_000257.4 | P1 |
Frequencies
GnomAD3 genomes ? AF: 0.0000592 AC: 9AN: 152150Hom.: 0 Cov.: 33
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GnomAD3 exomes AF: 0.0000437 AC: 11AN: 251460Hom.: 0 AF XY: 0.0000368 AC XY: 5AN XY: 135904
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GnomAD4 exome AF: 0.0000733 AC: 107AN: 1460192Hom.: 0 Cov.: 34 AF XY: 0.0000592 AC XY: 43AN XY: 726400
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ClinVar
Significance: Uncertain significance
Submissions summary: Pathogenic:1Uncertain:12Benign:1
Revision: reviewed by expert panel
LINK: link
Submissions by phenotype
not provided Uncertain:5
Uncertain significance, no assertion criteria provided | clinical testing | Genome Diagnostics Laboratory, University Medical Center Utrecht | - | - - |
Uncertain significance, criteria provided, single submitter | clinical testing | AiLife Diagnostics, AiLife Diagnostics | Jun 01, 2020 | - - |
Uncertain significance, criteria provided, single submitter | clinical testing | GeneDx | Sep 14, 2022 | Reported in association with hypertrophic cardiomyopathy (Ho et al., 2010; Alfares et al., 2015; Homburger et al., 2016; Murphy et al., 2016; Walsh et al., 2017); In silico analysis supports that this missense variant has a deleterious effect on protein structure/function; This variant is associated with the following publications: (PMID: 27247418, 26914223, 27532257, 27224906, 20818890, 25611685, 34542152, 28606303) - |
Uncertain significance, criteria provided, single submitter | clinical testing | Revvity Omics, Revvity | Oct 08, 2020 | - - |
Uncertain significance, no assertion criteria provided | clinical testing | Clinical Genetics DNA and cytogenetics Diagnostics Lab, Erasmus MC, Erasmus Medical Center | - | - - |
Hypertrophic cardiomyopathy Uncertain:3Benign:1
Uncertain significance, criteria provided, single submitter | clinical testing | Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine | Apr 04, 2019 | The p.Leu1428Ser variant in MYH7 has been identified in at least 3 individuals with HCM (Ho 2010, Homburger 2016, Murphy 2016, LMM data). This variant has also been identified in 4/67704 of European chromosomes by the Exome Aggregation Consortium (ExAC, http://exac.broadinstitute.org; dbSNP rs727503244). Leucine (Leu) at position 1428 is highly conserved in mammals and across evolutionarily distant species and the change to serine (Ser) was predicted to be pathogenic using a computational tool clinically validated by our laboratory. This tool's pathogenic prediction is estimated to be correct 94% of the time (Jordan 2011). In summary, while there is some suspicion for a pathogenic role, the clinical significance of the p.Leu1428Ser variant is uncertain. - |
Uncertain significance, reviewed by expert panel | curation | ClinGen Cardiomyopathy Variant Curation Expert Panel | Mar 22, 2021 | The c.4283T>C (p.Leu1428Ser) variant in MYH7 has been reported in at least 2 individuals with HCM (Alfares 2015 PMID:25611685; Murphy 2016 PMID:26914223; Homburger 2016 PMID:27247418; Walsh 2017 PMID:27532257; LMM per. comm.), but has also been identified in 0.0053% (FAF 95% CI, 12/129150) of non-Finnish European chromosomes in gnomAD v2.1.1 (https://gnomad.broadinstitute.org/). Since the MYH7 specifications state that PS4 is only applicable if the variant is absent or rare in large population studies, PS4 criterion was not applied (Kelly 2018 PMID:29300372). Computational prediction tools and conservation analysis suggest that this variant may impact the protein (PP3). In summary, due to a lack of evidence, this variant meets criteria to be classified as uncertain significance for hypertrophic cardiomyopathy in an autosomal dominant manner. MYH7-specific ACMG/AMP criteria applied (Kelly 2018 PMID:29300372): PP3 - |
Uncertain significance, criteria provided, single submitter | clinical testing | Invitae | Nov 19, 2023 | This sequence change replaces leucine, which is neutral and non-polar, with serine, which is neutral and polar, at codon 1428 of the MYH7 protein (p.Leu1428Ser). This variant is present in population databases (rs727503244, gnomAD 0.009%). This missense change has been observed in individual(s) with hypertrophic cardiomyopathy (PMID: 20818890, 25611685, 26914223, 27224906, 27247418). ClinVar contains an entry for this variant (Variation ID: 164289). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is expected to disrupt MYH7 protein function with a positive predictive value of 95%. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. - |
Benign, no assertion criteria provided | clinical testing | Cohesion Phenomics | Oct 10, 2022 | - - |
Cardiomyopathy Uncertain:2
Uncertain significance, criteria provided, single submitter | clinical testing | CHEO Genetics Diagnostic Laboratory, Children's Hospital of Eastern Ontario | Jan 07, 2022 | - - |
Uncertain significance, criteria provided, single submitter | clinical testing | Color Diagnostics, LLC DBA Color Health | Dec 06, 2022 | This missense variant replaces leucine with serine at codon 1428 of the MYH7 protein. Computational prediction suggests that this variant may have deleterious impact on protein structure and function (internally defined REVEL score threshold >= 0.7, PMID: 27666373). To our knowledge, functional studies have not been reported for this variant. This variant has been reported in three individuals affected with hypertrophic cardiomyopathy (PMID: 20818890, 26914223, 27532257, 33495597). This variant has been identified in 12/282834 chromosomes in the general population by the Genome Aggregation Database (gnomAD). The available evidence is insufficient to determine the role of this variant in disease conclusively. Therefore, this variant is classified as a Variant of Uncertain Significance. - |
Restrictive cardiomyopathy Pathogenic:1
Likely pathogenic, criteria provided, single submitter | clinical testing | Blueprint Genetics | Nov 23, 2015 | - - |
Congenital myopathy with fiber type disproportion;C1834481:Dilated cardiomyopathy 1S;C1842160:Myosin storage myopathy;C1850709:Myopathy, myosin storage, autosomal recessive;C3495498:Hypertrophic cardiomyopathy 1;C4552004:MYH7-related skeletal myopathy Uncertain:1
Uncertain significance, criteria provided, single submitter | clinical testing | Fulgent Genetics, Fulgent Genetics | Nov 05, 2021 | - - |
Cardiovascular phenotype Uncertain:1
Uncertain significance, criteria provided, single submitter | clinical testing | Ambry Genetics | Oct 14, 2022 | The p.L1428S variant (also known as c.4283T>C), located in coding exon 29 of the MYH7 gene, results from a T to C substitution at nucleotide position 4283. The leucine at codon 1428 is replaced by serine, an amino acid with dissimilar properties. This variant has been reported in a few hypertrophic cardiomyopathy cohorts; however, clinical details were limited (Ho CY et al. N. Engl. J. Med. 2010;363:552-63; Alfares AA et al. Genet. Med. 2015;17:880-8; Murphy SL et al. J Cardiovasc Transl Res. 2016;9:153-61). This amino acid position is highly conserved in available vertebrate species. In addition, this alteration is predicted to be deleterious by in silico analysis. Since supporting evidence is limited at this time, the clinical significance of this alteration remains unclear. - |
Computational scores
Source:
Name
Calibrated prediction
Score
Prediction
AlphaMissense
Pathogenic
CardioboostCm
Pathogenic
BayesDel_addAF
Pathogenic
D
BayesDel_noAF
Pathogenic
Cadd
Pathogenic
Dann
Uncertain
DEOGEN2
Pathogenic
D
Eigen
Pathogenic
Eigen_PC
Pathogenic
FATHMM_MKL
Pathogenic
D
LIST_S2
Uncertain
D
M_CAP
Pathogenic
D
MetaRNN
Pathogenic
D
MetaSVM
Uncertain
D
MutationAssessor
Pathogenic
H
MutationTaster
Benign
D
PrimateAI
Uncertain
T
PROVEAN
Uncertain
D
REVEL
Pathogenic
Sift
Pathogenic
D
Sift4G
Uncertain
D
Polyphen
D
Vest4
MutPred
Loss of stability (P = 0.0083);
MVP
MPC
ClinPred
D
GERP RS
Varity_R
gMVP
Splicing
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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