rs370093487

Variant summary

Our verdict is Benign. Variant got -8 ACMG points: 0P and 8B. BP4_StrongBP6_Strong

The NM_000257.4(MYH7):c.4354-7C>T variant causes a splice region, splice polypyrimidine tract, intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000236 in 1,613,304 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 2/2 splice prediction tools predict no significant impact on normal splicing. Variant has been reported in ClinVar as Uncertain significance (★★★).

Frequency

Genomes: 𝑓 0.0000066 ( 0 hom., cov: 33)

Exomes 𝑓: 0.000025 ( 0 hom. )

Consequence

MYH7
NM_000257.4 splice_region, splice_polypyrimidine_tract, intron

Scores

Splicing: ADA: 0.00002345

Clinical Significance

Uncertain significance reviewed by expert panel U:2B:4

Conservation

PhyloP100: -0.100

Variant links:

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]

MYH7 links:

MHRT (HGNC:):

MHRT links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Benign. Variant got -8 ACMG points.

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.79).

BP6

Variant 14-23417325-G-A is Benign according to our data. Variant chr14-23417325-G-A is described in ClinVar as [Uncertain_significance]. Clinvar id is 43011.Status of the report is reviewed_by_expert_panel, 3 stars. We mark this variant Likely_benign, oryginal submissions are: {Benign=1, Likely_benign=3, Uncertain_significance=2}. Variant chr14-23417325-G-A is described in Lovd as [Benign].

Transcripts

RefSeq

Gene	Transcript	HGVSc	Effect	#exon/exons	MANE
MYH7	NM_000257.4 linkuse as main transcript	c.4354-7C>T	splice_region_variant, splice_polypyrimidine_tract_variant, intron_variant		ENST00000355349.4
MHRT	NR_126491.1 linkuse as main transcript	n.765G>A	non_coding_transcript_exon_variant	5/6
MYH7	NM_001407004.1 linkuse as main transcript	c.4354-7C>T	splice_region_variant, splice_polypyrimidine_tract_variant, intron_variant

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
MYH7	ENST00000355349.4 linkuse as main transcript	c.4354-7C>T		splice_region_variant, splice_polypyrimidine_tract_variant, intron_variant		1	NM_000257.4	P1

Frequencies

GnomAD3 genomes

AF:

0.00000657

AC:

AN:

152140

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000147

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000400

AC:

AN:

250238

Hom.:

AF XY:

0.0000591

AC XY:

AN XY:

135316

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.000116

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.0000327

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000443

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000253

AC:

AN:

1461164

Hom.:

Cov.:

AF XY:

0.0000330

AC XY:

AN XY:

726852

show subpopulations

Gnomad4 AFR exome

AF:

0.0000598

Gnomad4 AMR exome

AF:

0.0000894

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.0000116

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000216

Gnomad4 OTH exome

AF:

0.0000828

GnomAD4 genome

AF:

0.00000657

AC:

AN:

152140

Hom.:

Cov.:

AF XY:

0.0000135

AC XY:

AN XY:

74326

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000147

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000283

Hom.:

Bravo

AF:

0.0000264

EpiCase

AF:

0.00

EpiControl

AF:

0.0000593

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2Benign:4

Revision: reviewed by expert panel

LINK: link

Submissions by phenotype

not specified

Uncertain:1Benign:1

Uncertain significance, criteria provided, single submitter	clinical testing	Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine	Jul 25, 2011	The 4354-7C>T variant has not been reported in the literature. This variant has been identified by our laboratory in two individuals with a clinical diagnosis a nd family history of HCM. Of note, this variant did not segregate with the famil y history of HCM in one of these family. The 4354-7C>T variant is located in the 3' splice acceptor region but does not affect the highly conserved -1 and -2 po sitions. However, positions -3 and -5 to -12 are part of the splicing consensus sequence and variants involving these positions can sometimes affect splicing. T herefore, the clinical significance of this variant cannot be determined at this time. -
Benign, criteria provided, single submitter	clinical testing	GeneDx	Nov 08, 2013	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. -

Hypertrophic cardiomyopathy

Uncertain:1Benign:1

Likely benign, criteria provided, single submitter	clinical testing	Invitae	Oct 11, 2023	- -
Uncertain significance, reviewed by expert panel	curation	ClinGen Cardiomyopathy Variant Curation Expert Panel	Jun 23, 2021	The NM_000257.4(MYH7):c.4354-7C>T variant has been reported in 3 individuals with HCM (Invitae pers. comm; LMM pers. comm.). This variant has also been identified in 0.004% (FAF 95% CI; 4/34362) of Latino/Admixed American chromosomes by 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, the PS4 criterion was not applied (Kelly 2018 PMID:29300372). This variant is located in the 3' splice region and computational tools do not predict an impact on splicing, though this information is not predictive enough to rule out pathogenicity (BP4). In summary, due to insufficient evidence, this variant is classified as uncertain significance for hypertrophic cardiomyopathy in an autosomal dominant manner. MYH7-specific ACMG/AMP criteria applied (PMID:29300372): BP4. -

Cardiomyopathy

Benign:2

Likely benign, criteria provided, single submitter	clinical testing	Color Diagnostics, LLC DBA Color Health	Nov 23, 2018	- -
Likely benign, criteria provided, single submitter	clinical testing	All of Us Research Program, National Institutes of Health	Feb 05, 2024	- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.79

Cadd

Benign

0.59

Dann

Benign

0.82

Splicing

Name

Calibrated prediction

Score

Prediction

dbscSNV1_ADA

Benign

0.000023

dbscSNV1_RF

Benign

0.0080

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over