rs188319622

Variant names:

• chr18-3102510-T-C
• rs188319622
• NM_003803.4:c.3539A>G

Your query was ambiguous. Multiple possible variants found:

• chr18-3102510-T-C
• chr18-3102510-T-G

Variant summary

Our verdict is Benign. The variant received -9 ACMG points: 0P and 9B. BP4_Strong BP6 BS2

The NM_003803.4(MYOM1):​c.3539A>G​(p.Asp1180Gly) variant causes a missense change. The variant allele was found at a frequency of 0.000284 in 1,613,292 control chromosomes in the GnomAD database, including 2 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. D1180A) has been classified as Uncertain significance.

• Frequency:
  • Genomes: 𝑓 0.0016 (1 hom., cov: 32)
  • Exomes 𝑓: 0.00015 (1 hom.)
• Consequence: MYOM1 NM_003803.4 missense
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:3 B:3
• Conservation: PhyloP100: 5.16
• Publications: 1 publications found

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

ACMG classification

Our verdict: Benign. The variant received -9 ACMG points.

• BP4: Computational evidence support a benign effect (MetaRNN=0.009597391).
• BP6: Variant 18-3102510-T-C is Benign according to our data. Variant chr18-3102510-T-C is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 227701.
• BS2: High AC in GnomAd4 at 237 AD gene.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_003803.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	MYOM1	NM_003803.4	MANE Select	c.3539A>G	p.Asp1180Gly	missense	Exon 23 of 38	NP_003794.3
	MYOM1	NM_019856.2		c.3251A>G	p.Asp1084Gly	missense	Exon 22 of 37	NP_062830.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	MYOM1	ENST00000356443.9	TSL:1 MANE Select	c.3539A>G	p.Asp1180Gly	missense	Exon 23 of 38	ENSP00000348821.4
	MYOM1	ENST00000261606.11	TSL:1	c.3251A>G	p.Asp1084Gly	missense	Exon 22 of 37	ENSP00000261606.7

Frequencies

GnomAD3 genomes AF: 0.00155 AC: 236 AN: 151832 Hom.: 1 Cov.: 32

Gnomad AFR AF: 0.00540

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.000788

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: 0.00

Gnomad OTH AF: 0.000479

GnomAD2 exomes AF: 0.000386 AC: 96 AN: 248984 AF XY: 0.000289

Gnomad AFR exome AF: 0.00536

Gnomad AMR exome AF: 0.000291

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00000886

Gnomad OTH exome AF: 0.000166

GnomAD4 exome AF: 0.000151 AC: 221 AN: 1461342 Hom.: 1 Cov.: 30 AF XY: 0.000131 AC XY: 95 AN XY: 726974

African (AFR) AF: 0.00526 AC: 176 AN: 33464

American (AMR) AF: 0.000313 AC: 14 AN: 44660

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26124

East Asian (EAS) AF: 0.00 AC: 0 AN: 39684

South Asian (SAS) AF: 0.0000464 AC: 4 AN: 86200

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53390

Middle Eastern (MID) AF: 0.000693 AC: 4 AN: 5768

European-Non Finnish (NFE) AF: 9.00e-7 AC: 1 AN: 1111704

Other (OTH) AF: 0.000365 AC: 22 AN: 60348

GnomAD4 genome AF: 0.00156 AC: 237 AN: 151950 Hom.: 1 Cov.: 32 AF XY: 0.00155 AC XY: 115 AN XY: 74278

African (AFR) AF: 0.00541 AC: 224 AN: 41416

American (AMR) AF: 0.000787 AC: 12 AN: 15250

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3460

East Asian (EAS) AF: 0.00 AC: 0 AN: 5158

South Asian (SAS) AF: 0.00 AC: 0 AN: 4822

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10574

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 292

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 67958

Other (OTH) AF: 0.000474 AC: 1 AN: 2108

Alfa AF: 0.000798 Hom.: 1

Bravo AF: 0.00176

ESP6500AA AF: 0.00476 AC: 18

ESP6500EA AF: 0.00 AC: 0

ExAC AF: 0.000455 AC: 55

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:3 Benign:3

Revision: criteria provided, conflicting classifications

Submissions by phenotype

not specified Uncertain:1 Benign:1

Mar 13, 2015

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

p.Asp1180Gly in exon 23 of MYOM1: This variant is not expected to have clinical significance because it has been identified in 0.5% (51/9800) of African chromos omes by the Exome Aggregation Consortium (ExAC, http://exac.broadinstitute.org; dbSNP rs188319622).

Jan 04, 2025

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The p.D1180G variant (also known as c.3539A>G), located in coding exon 22 of the MYOM1 gene, results from an A to G substitution at nucleotide position 3539. The aspartic acid at codon 1180 is replaced by glycine, an amino acid with similar properties. This amino acid position is conserved. In addition, the in silico prediction for this alteration is inconclusive. Since supporting evidence is limited at this time, the clinical significance of this alteration remains unclear.

not provided Uncertain:1 Benign: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.Asp1180Gly (c.3539A>G): This variant has not been reported in the literature and is present in 0.5% (137/24170) of African alleles in the Genome Aggregation Database (http://gnomad.broadinstitute.org/variant/18-3102508-T-C). This variant is present in ClinVar (Variation ID:227701). Evolutionary conservation and computational predictive tools for this variant are unclear. In summary, data on this variant is insufficient for disease classification. Therefore, the clinical significance of this variant is uncertain.

Breakthrough Genomics, Breakthrough Genomics

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: not provided

Hypertrophic cardiomyopathy Uncertain:1 Benign:1

Jan 26, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Apr 10, 2025

Clinical Genomics Laboratory, Washington University in St. Louis

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The MYOM1 c.3539A>G (p.Asp1180Gly) variant, to our knowledge, has not been reported in the medical literature. The highest population minor allele frequency in the population database genome aggregation database (v.2.1.1) is 0.5% in the African population. Computational predictors are uncertain as to the impact of this variant on MYOM1 function. This variant has been reported in the ClinVar database as a germline variant of uncertain significance and likely benign by two submitters each and benign by one submitter (Variation ID: 227701). Due to limited information, the clinical significance of this variant is uncertain.

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.29
BayesDel_addAF	Benign	-0.21	T
BayesDel_noAF	Uncertain	-0.070
CADD	Benign	22
DANN	Uncertain	1.0
DEOGEN2	Benign	0.29	T
Eigen	Uncertain	0.65
Eigen_PC	Uncertain	0.60
FATHMM_MKL	Pathogenic	0.97	D
LIST_S2	Benign	0.74	T
M_CAP	Benign	0.019	T
MetaRNN	Benign	0.0096	T
MetaSVM	Uncertain	-0.029	T
MutationAssessor	Uncertain	2.6	M
PhyloP100		5.2
PrimateAI	Benign	0.40	T
PROVEAN	Pathogenic	-6.0	D
REVEL	Uncertain	0.30
Sift	Benign	0.051	T
Sift4G	Uncertain	0.0020	D
Polyphen		0.99	D
Vest4		0.39
MVP		0.93
MPC		0.26
ClinPred		0.051	T
GERP RS		5.5
Varity_R		0.55
gMVP		0.77
Mutation Taster		=50/50

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		Details are displayed if max score is > 0.2

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

Other links and lift over

dbSNP: rs188319622; hg19: chr18-3102508;