rs397516238

Variant names:

• chr14-23432502-T-A
• rs397516238
• NM_000257.4:c.507A>T

Variant summary

Our verdict is Likely pathogenic. Variant got 9 ACMG points: 9P and 0B. PM2 PM5 PP2 PP3_Moderate PP5_Moderate

The NM_000257.4(MYH7):​c.507A>T​(p.Arg169Ser) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R169G) has been classified as Likely pathogenic.

• Frequency: Genomes: not found (cov: 32)
• Consequence: MYH7 NM_000257.4 missense
• Clinical Significance: Likely pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: -1.71

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]

ACMG classification

Verdict is Likely_pathogenic. Variant got 9 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr14-23432504-T-C is described in Lovd as [Likely_pathogenic].
• PP2: Missense variant in the MYH7 gene, where missense mutations are typically associated with disease (based on misZ statistic). The gene has 341 curated pathogenic missense variants (we use a threshold of 10). The gene has 16 curated benign missense variants. Gene score misZ: 3.9329 (above the threshold of 3.09). Trascript score misZ: 6.7889 (above the threshold of 3.09). GenCC associations: The gene is linked to hyaline body myopathy, MYH7-related skeletal myopathy, dilated cardiomyopathy 1S, congenital myopathy 7A, myosin storage, autosomal dominant, dilated cardiomyopathy, left ventricular noncompaction, myopathy, myosin storage, autosomal dominant, hypertrophic cardiomyopathy, congenital heart disease, Ebstein anomaly, arrhythmogenic right ventricular cardiomyopathy, myopathy, myosin storage, autosomal recessive, hypertrophic cardiomyopathy 1, familial isolated dilated cardiomyopathy.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.901
• PP5: Variant 14-23432502-T-A is Pathogenic according to our data. Variant chr14-23432502-T-A is described in ClinVar as [Likely_pathogenic]. Clinvar id is 43055.Status of the report is criteria_provided_single_submitter, 1 stars. Variant chr14-23432502-T-A is described in Lovd as [Likely_pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
MYH7	NM_000257.4	c.507A>T	p.Arg169Ser	missense_variant	Exon 6 of 40	ENST00000355349.4	NP_000248.2
MYH7	NM_001407004.1	c.507A>T	p.Arg169Ser	missense_variant	Exon 5 of 39		NP_001393933.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
MYH7	ENST00000355349.4	c.507A>T	p.Arg169Ser	missense_variant	Exon 6 of 40	1	NM_000257.4	ENSP00000347507.3

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 33

GnomAD4 genome Cov.: 32

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

Hypertrophic cardiomyopathy Pathogenic:1

Dec 15, 2017

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

p.Arg169Ser, c.507A>T (MYH7; NM_000257.2; Chr14g.23901711T>A; GRCh37): The p.Arg 169Ser variant in MYH7 has not been previously reported in individuals with HCM and was absent from large population studies. Arginine (Arg) at position 169 is highly conserved in mammals and across evolutionarily distant species and the ch ange to Serine (Ser) was predicted to be pathogenic using a computational tool c linically validated by our laboratory. This tool's pathogenic prediction is esti mated to be correct 94% of the time (Jordan 2011). Of note, this variant lies in the head region of the protein. Missense variants in this region have been repo rted and statistically indicated to be more likely to cause disease (Walsh 2016) . In addition, two other amino acid substitutions involving this codon, p.Arg169 Gly and p.Arg169Lys, have also been identified in affected individuals (Maron 20 09, LMM data). In summary, although additional studies are required to fully est ablish its clinical significance, the p.Arg169Ser variant is likely pathogenic. ACMG/AMP Criteria applied: PM1, PM2, PM5, PP3. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.97
CardioboostCm	Pathogenic	1.0
BayesDel_addAF	Pathogenic	0.38	D
BayesDel_noAF	Pathogenic	0.30
CADD	Uncertain	24
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.87	D
Eigen	Benign	0.037
Eigen_PC	Benign	-0.17
FATHMM_MKL	Benign	0.078	N
LIST_S2	Uncertain	0.92	D
M_CAP	Pathogenic	0.97	D
MetaRNN	Pathogenic	0.90	D
MetaSVM	Uncertain	0.63	D
MutationAssessor	Benign	1.9	L
PrimateAI	Pathogenic	0.82	D
PROVEAN	Pathogenic	-4.5	D
REVEL	Pathogenic	0.68
Sift	Pathogenic	0.0	D
Sift4G	Uncertain	0.017	D
Polyphen		1.0	D
Vest4		0.90
MutPred		0.53		Gain of disorder (P = 0.0541);
MVP		0.89
MPC		2.2
ClinPred		0.95	D
GERP RS		-0.49
Varity_R		0.86
gMVP		0.94

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.0		Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Other links and lift over

dbSNP: rs397516238; hg19: chr14-23901711;