18-3067417-C-T

Variant names:

Variant summary

Our verdict is Benign. Variant got -9 ACMG points: 0P and 9B. BP4_StrongBP6BS2

The NM_003803.4(MYOM1):c.4903G>A(p.Gly1635Ser) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000873 in 1,613,598 control chromosomes in the GnomAD database, including 2 homozygotes. In-silico tool predicts a benign outcome for this variant. 15/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

Frequency

Genomes: 𝑓 0.00059 ( 0 hom., cov: 33)

Exomes 𝑓: 0.00090 ( 2 hom. )

Consequence

MYOM1
NM_003803.4 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:1B:1

Conservation

PhyloP100: 0.800

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:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Benign. Variant got -9 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.053989947).

BP6

Variant 18-3067417-C-T is Benign according to our data. Variant chr18-3067417-C-T is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 239578.We mark this variant Likely_benign, oryginal submissions are: {Likely_benign=1, Uncertain_significance=1}.

BS2

High Homozygotes in GnomAdExome4 at 2 AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
MYOM1	NM_003803.4 link	c.4903G>A	p.Gly1635Ser	missense_variant	Exon 38 of 38	ENST00000356443.9	NP_003794.3	P52179-1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
MYOM1	ENST00000356443.9 link	c.4903G>A	p.Gly1635Ser	missense_variant	Exon 38 of 38	1	NM_003803.4	ENSP00000348821.4	P52179-1
MYOM1	ENST00000261606.11 link	c.4615G>A	p.Gly1539Ser	missense_variant	Exon 37 of 37	1		ENSP00000261606.7	P52179-2
MYOM1	ENST00000581804.1 link	n.393G>A		non_coding_transcript_exon_variant	Exon 3 of 3	3

Frequencies

GnomAD3 genomes

AF:

0.000591

AC:

AN:

152236

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000338

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.0000654

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:

0.00110

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.000467

AC:

117

AN:

250512

Hom.:

AF XY:

0.000458

AC XY:

AN XY:

135458

show subpopulations

Gnomad AFR exome

AF:

0.000371

Gnomad AMR exome

AF:

0.000203

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.0000927

Gnomad NFE exome

AF:

0.000891

Gnomad OTH exome

AF:

0.000163

GnomAD4 exome

AF:

0.000902

AC:

1318

AN:

1461244

Hom.:

Cov.:

AF XY:

0.000867

AC XY:

630

AN XY:

726906

show subpopulations

Gnomad4 AFR exome

AF:

0.000299

Gnomad4 AMR exome

AF:

0.000134

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.0000504

Gnomad4 SAS exome

AF:

0.0000116

Gnomad4 FIN exome

AF:

0.0000749

Gnomad4 NFE exome

AF:

0.00113

Gnomad4 OTH exome

AF:

0.000564

GnomAD4 genome

AF:

0.000591

AC:

AN:

152354

Hom.:

Cov.:

AF XY:

0.000564

AC XY:

AN XY:

74502

show subpopulations

Gnomad4 AFR

AF:

0.000337

Gnomad4 AMR

AF:

0.0000653

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.00110

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.000779

Hom.:

Bravo

AF:

0.000525

TwinsUK

AF:

0.00243

AC:

ALSPAC

AF:

0.00156

AC:

ESP6500AA

AF:

0.000454

AC:

ESP6500EA

AF:

0.000698

AC:

ExAC

AF:

0.000428

AC:

EpiCase

AF:

0.000600

EpiControl

AF:

0.00101

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:1Benign:1

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Sep 11, 2024

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.4903G>A (p.G1635S) alteration is located in exon 38 (coding exon 37) of the MYOM1 gene. This alteration results from a G to A substitution at nucleotide position 4903, causing the glycine (G) at amino acid position 1635 to be replaced by a serine (S). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Hypertrophic cardiomyopathy

Benign:1

Jan 23, 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

0.16

BayesDel_addAF

Benign

-0.50

BayesDel_noAF

Benign

-0.49

CADD

Benign

DANN

Benign

0.95

DEOGEN2

Benign

0.033

T;.;.

Eigen

Benign

-0.67

Eigen_PC

Benign

-0.64

FATHMM_MKL

Benign

0.21

LIST_S2

Uncertain

0.91

D;D;D

M_CAP

Benign

0.013

MetaRNN

Benign

0.054

T;T;T

MetaSVM

Benign

-1.1

MutationAssessor

Benign

0.080

N;.;.

PrimateAI

Benign

0.32

PROVEAN

Benign

-1.1

N;.;N

REVEL

Benign

0.13

Sift

Benign

0.13

T;.;T

Sift4G

Benign

0.44

T;T;T

Polyphen

0.83

P;.;P

Vest4

0.069

MVP

0.36

MPC

0.20

ClinPred

0.020

GERP RS

4.9

Varity_R

0.11

gMVP

0.34

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