chr18-3102501-C-T

Variant names:

Variant summary

Our verdict is Benign. The variant received -7 ACMG points: 0P and 7B. BP4_ModerateBP6BS2

The NM_003803.4(MYOM1):c.3548G>A(p.Arg1183Gln) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000227 in 1,612,752 control chromosomes in the GnomAD database, including 6 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Synonymous variant affecting the same amino acid position (i.e. R1183R) has been classified as Likely benign.

Frequency

Genomes: 𝑓 0.00024 ( 0 hom., cov: 32)

Exomes 𝑓: 0.00023 ( 6 hom. )

Consequence

MYOM1
NM_003803.4 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:2B:2

Conservation

PhyloP100: 7.91

Publications

2 publications found

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 Gene-Disease associations (from GenCC):

hypertrophic cardiomyopathy
Inheritance: AD Classification: NO_KNOWN Submitted by: ClinGen

MYOM1 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -7 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.20823881).

BP6

Variant 18-3102501-C-T is Benign according to our data. Variant chr18-3102501-C-T is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 229025.

BS2

High AC in GnomAd4 at 36 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
MYOM1	NM_003803.4 link	c.3548G>A	p.Arg1183Gln	missense_variant	Exon 23 of 38	ENST00000356443.9	NP_003794.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
MYOM1	ENST00000356443.9 link	c.3548G>A	p.Arg1183Gln	missense_variant	Exon 23 of 38	1	NM_003803.4	ENSP00000348821.4
MYOM1	ENST00000261606.11 link	c.3260G>A	p.Arg1087Gln	missense_variant	Exon 22 of 37	1		ENSP00000261606.7

Frequencies

GnomAD3 genomes

AF:

0.000237

AC:

AN:

152094

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000724

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000393

Gnomad ASJ

AF:

0.00548

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.000103

Gnomad OTH

AF:

0.000480

GnomAD2 exomes

AF:

0.000274

AC:

AN:

248046

AF XY:

0.000327

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.000293

Gnomad ASJ exome

AF:

0.00289

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.000231

Gnomad OTH exome

AF:

0.000333

GnomAD4 exome

AF:

0.000226

AC:

330

AN:

1460540

Hom.:

Cov.:

AF XY:

0.000215

AC XY:

156

AN XY:

726510

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33420

American (AMR)

AF:

0.000247

AC:

AN:

44520

Ashkenazi Jewish (ASJ)

AF:

0.00356

AC:

AN:

26098

East Asian (EAS)

AF:

0.00

AC:

AN:

39674

South Asian (SAS)

AF:

0.0000465

AC:

AN:

86004

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53384

Middle Eastern (MID)

AF:

0.0132

AC:

AN:

5764

European-Non Finnish (NFE)

AF:

0.0000990

AC:

110

AN:

1111350

Other (OTH)

AF:

0.000597

AC:

AN:

60326

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.485

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Exome Hom

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.000237

AC:

AN:

152212

Hom.:

Cov.:

AF XY:

0.000323

AC XY:

AN XY:

74418

show subpopulations

African (AFR)

AF:

0.0000722

AC:

AN:

41530

American (AMR)

AF:

0.000393

AC:

AN:

15280

Ashkenazi Jewish (ASJ)

AF:

0.00548

AC:

AN:

3468

East Asian (EAS)

AF:

0.00

AC:

AN:

5184

South Asian (SAS)

AF:

0.00

AC:

AN:

4822

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10604

Middle Eastern (MID)

AF:

0.00

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.000103

AC:

AN:

68014

Other (OTH)

AF:

0.000475

AC:

AN:

2106

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.515

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

Alfa

AF:

0.000446

Hom.:

Bravo

AF:

0.000253

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.000484

AC:

ExAC

AF:

0.000240

AC:

EpiCase

AF:

0.000273

EpiControl

AF:

0.000415

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:2Benign:2

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Oct 30, 2015

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The p.Arg1183Gln variant in MYOM1 has not been previously reported in individual s with cardiomyopathy, but has been identified in 27/66568 European chromosomes by the Exome Aggregation Consortium (ExAC, http://exac.broadinstitute.org; dbSNP rs147050513). Computational prediction tools and conservation analysis suggest that this variant may impact the protein, though this information is not predict ive enough to determine pathogenicity. In summary, the clinical significance of the p.Arg1183Gln variant is uncertain. -

not provided

Uncertain:1

Mar 30, 2021

Center for Genomics, Ann and Robert H. Lurie Children's Hospital of Chicago

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

MYOM1 NM_003803.3 exon 23 p.Arg1183Gln (c.3548G>A): This variant has not been reported in the literature and is present in 0.3% (34/10118) of Ashkenazi Jewish alleles in the Genome Aggregation Database (http://gnomad.broadinstitute.org/variant/18-3102499-C-T). This variant is present in ClinVar (Variation ID:229025). Evolutionary conservation and computational predictive tools suggest that this variant may impact the protein. In summary, data on this variant is insufficient for disease classification. Therefore, the clinical significance of this variant is uncertain. -

MYOM1-related disorder

Benign:1

Jul 25, 2019

PreventionGenetics, part of Exact Sciences

Significance:Likely benign

Review Status:no assertion criteria provided

Collection Method:clinical testing

This variant is classified as likely benign based on ACMG/AMP sequence variant interpretation guidelines (Richards et al. 2015 PMID: 25741868, with internal and published modifications). -

Hypertrophic cardiomyopathy

Benign:1

Jan 27, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.25

BayesDel_addAF

Uncertain

0.044

BayesDel_noAF

Uncertain

0.13

CADD

Benign

(source)

DANN

Uncertain

1.0

DEOGEN2

Benign

0.29

T;.;.

Eigen

Uncertain

0.61

Eigen_PC

Uncertain

0.48

FATHMM_MKL

Pathogenic

0.99

LIST_S2

Uncertain

0.92

D;D;D

M_CAP

Uncertain

0.15

MetaRNN

Benign

0.21

T;T;T

MetaSVM

Uncertain

0.52

MutationAssessor

Pathogenic

3.0

M;.;.

PhyloP100

7.9

PrimateAI

Benign

0.32

PROVEAN

Uncertain

-3.3

D;.;D

REVEL

Uncertain

0.52

Sift

Uncertain

0.016

D;.;D

Sift4G

Uncertain

0.0060

D;D;D

Polyphen

1.0

D;.;D

Vest4

0.90

MVP

0.92

MPC

0.66

ClinPred

0.47

GERP RS

5.5

Varity_R

0.61

gMVP

0.87

Mutation Taster

=64/36

polymorphism

(source)

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

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over