chr18-3188780-C-T

Position:

chr18-3188780-C-T

Variant summary

Our verdict is Benign. Variant got -16 ACMG points: 0P and 16B. BP4_StrongBP6_Very_StrongBS2

The NM_003803.4(MYOM1):c.739G>A(p.Glu247Lys) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00562 in 1,601,050 control chromosomes in the GnomAD database, including 36 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★).

Frequency

Genomes: 𝑓 0.0042 ( 5 hom., cov: 30)

Exomes 𝑓: 0.0058 ( 31 hom. )

Consequence

MYOM1
NM_003803.4 missense

Scores

Clinical Significance

Benign/Likely benign criteria provided, multiple submitters, no conflicts B:5

Conservation

PhyloP100: 3.35

Variant links:

Genes affected

MYOM1 (HGNC:7613): (myomesin 1) The giant protein titin, together with its associated proteins, interconnects the major structure of sarcomeres, the M bands and Z discs. The C-terminal end of the titin string extends into the M line, where it binds tightly to M-band constituents of apparent molecular masses of 190 kD (myomesin 1) and 165 kD (myomesin 2). This protein, myomesin 1, like myomesin 2, titin, and other myofibrillar proteins contains structural modules with strong homology to either fibronectin type III (motif I) or immunoglobulin C2 (motif II) domains. Myomesin 1 and myomesin 2 each have a unique N-terminal region followed by 12 modules of motif I or motif II, in the arrangement II-II-I-I-I-I-I-II-II-II-II-II. The two proteins share 50% sequence identity in this repeat-containing region. The head structure formed by these 2 proteins on one end of the titin string extends into the center of the M band. The integrating structure of the sarcomere arises from muscle-specific members of the superfamily of immunoglobulin-like proteins. Alternatively spliced transcript variants encoding different isoforms have been identified. [provided by RefSeq, Jul 2008]

MYOM1 links:

MYOM1 (HGNC:):

MYOM1 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Benign. Variant got -16 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.008267403).

BP6

Variant 18-3188780-C-T is Benign according to our data. Variant chr18-3188780-C-T is described in ClinVar as [Likely_benign]. Clinvar id is 227707.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr18-3188780-C-T is described in Lovd as [Likely_benign].

BS2

High Homozygotes in GnomAd4 at 5 AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
MYOM1	NM_003803.4 linkuse as main transcript	c.739G>A	p.Glu247Lys	missense_variant	4/38	ENST00000356443.9	NP_003794.3	P52179-1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
MYOM1	ENST00000356443.9 linkuse as main transcript	c.739G>A	p.Glu247Lys	missense_variant	4/38	1	NM_003803.4	ENSP00000348821.4		P52179-1
MYOM1	ENST00000261606.11 linkuse as main transcript	c.739G>A	p.Glu247Lys	missense_variant	4/37	1		ENSP00000261606.7		P52179-2

Frequencies

GnomAD3 genomes

AF:

0.00423

AC:

643

AN:

152050

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00104

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00576

Gnomad ASJ

AF:

0.00231

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.000828

Gnomad FIN

AF:

0.00587

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00635

Gnomad OTH

AF:

0.00288

GnomAD3 exomes

AF:

0.00440

AC:

1061

AN:

241250

Hom.:

AF XY:

0.00450

AC XY:

590

AN XY:

130978

show subpopulations

Gnomad AFR exome

AF:

0.00111

Gnomad AMR exome

AF:

0.00378

Gnomad ASJ exome

AF:

0.00214

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00153

Gnomad FIN exome

AF:

0.00690

Gnomad NFE exome

AF:

0.00619

Gnomad OTH exome

AF:

0.00566

GnomAD4 exome

AF:

0.00576

AC:

8351

AN:

1448882

Hom.:

Cov.:

AF XY:

0.00560

AC XY:

4025

AN XY:

718942

show subpopulations

Gnomad4 AFR exome

AF:

0.00106

Gnomad4 AMR exome

AF:

0.00366

Gnomad4 ASJ exome

AF:

0.00192

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00138

Gnomad4 FIN exome

AF:

0.00667

Gnomad4 NFE exome

AF:

0.00667

Gnomad4 OTH exome

AF:

0.00443

GnomAD4 genome

AF:

0.00423

AC:

643

AN:

152168

Hom.:

Cov.:

AF XY:

0.00411

AC XY:

306

AN XY:

74374

show subpopulations

Gnomad4 AFR

AF:

0.00104

Gnomad4 AMR

AF:

0.00576

Gnomad4 ASJ

AF:

0.00231

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.000829

Gnomad4 FIN

AF:

0.00587

Gnomad4 NFE

AF:

0.00635

Gnomad4 OTH

AF:

0.00285

Alfa

AF:

0.00559

Hom.:

Bravo

AF:

0.00425

TwinsUK

AF:

0.00755

AC:

ALSPAC

AF:

0.00804

AC:

ESP6500AA

AF:

0.00180

AC:

ESP6500EA

AF:

0.00557

AC:

ExAC

AF:

0.00386

AC:

467

Asia WGS

AF:

0.000577

AC:

AN:

3478

ClinVar

Significance: Benign/Likely benign

Submissions summary: Benign:5

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not provided

Benign:2

Likely benign, criteria provided, single submitter	not provided	Breakthrough Genomics, Breakthrough Genomics	-	- -
Likely benign, criteria provided, single submitter	clinical testing	CeGaT Center for Human Genetics Tuebingen	Sep 01, 2024	MYOM1: BP4 -

not specified

Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

Apr 09, 2015

p.Glu247Lys in exon 4 of MYOM1: This variant is not expected to have clinical si gnificance because it has been identified in 0.8% (48/6100) of Finnish chromosom es by the Exome Aggregation Consortium (ExAC, http://exac.broadinstitute.org; db SNP rs139422575). -

Hypertrophic cardiomyopathy

Benign:1

Benign, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jan 13, 2024

- -

Cardiovascular phenotype

Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Ambry Genetics

Feb 18, 2013

This alteration is classified as likely 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: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Uncertain

0.42

BayesDel_addAF

Benign

-0.24

BayesDel_noAF

Benign

-0.11

CADD

Uncertain

DANN

Pathogenic

1.0

DEOGEN2

Benign

0.066

T;.;.

Eigen

Uncertain

0.37

Eigen_PC

Uncertain

0.46

FATHMM_MKL

Uncertain

0.97

LIST_S2

Uncertain

0.94

D;D;D

MetaRNN

Benign

0.0083

T;T;T

MetaSVM

Benign

-1.0

MutationAssessor

Benign

1.3

L;.;L

PrimateAI

Uncertain

0.56

PROVEAN

Uncertain

-2.5

D;.;N

REVEL

Benign

0.25

Sift

Uncertain

0.0050

D;.;D

Sift4G

Uncertain

0.037

D;D;D

Polyphen

0.97

D;.;P

Vest4

0.49

MVP

0.83

MPC

0.17

ClinPred

0.011

GERP RS

5.8

Varity_R

0.34

gMVP

0.47

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

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