chr18-3067282-C-T

Variant names:

• chr18-3067282-C-T
• rs762687220
• NM_003803.4:c.5038G>A

Variant summary

Our verdict is Likely benign. The variant received -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The NM_003803.4(MYOM1):​c.5038G>A​(p.Gly1680Ser) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000206 in 1,453,878 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 16/22 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. G1680R) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000021 (0 hom.)
• Consequence: MYOM1 NM_003803.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.798
• Publications: 0 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: Likely_benign. The variant received -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.06785536).

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

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	MYOM1	NM_003803.4	MANE Select	c.5038G>A	p.Gly1680Ser	missense	Exon 38 of 38	NP_003794.3
	MYOM1	NM_019856.2		c.4750G>A	p.Gly1584Ser	missense	Exon 37 of 37	NP_062830.1	P52179-2

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	MYOM1	ENST00000356443.9	TSL:1 MANE Select	c.5038G>A	p.Gly1680Ser	missense	Exon 38 of 38	ENSP00000348821.4	P52179-1
	MYOM1	ENST00000261606.11	TSL:1	c.4750G>A	p.Gly1584Ser	missense	Exon 37 of 37	ENSP00000261606.7	P52179-2
	MYOM1	ENST00000941943.1		c.5002G>A	p.Gly1668Ser	missense	Exon 38 of 38	ENSP00000612002.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD2 exomes AF: 0.00000420 AC: 1 AN: 238160 AF XY: 0.00000774

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000206 AC: 3 AN: 1453878 Hom.: 0 Cov.: 33 AF XY: 0.00000277 AC XY: 2 AN XY: 722642

African (AFR) AF: 0.00 AC: 0 AN: 33274

American (AMR) AF: 0.00 AC: 0 AN: 43818

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 25896

East Asian (EAS) AF: 0.00 AC: 0 AN: 39488

South Asian (SAS) AF: 0.0000118 AC: 1 AN: 85088

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53016

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 4144

European-Non Finnish (NFE) AF: 0.00000180 AC: 2 AN: 1109138

Other (OTH) AF: 0.00 AC: 0 AN: 60016

GnomAD4 genome Cov.: 33

Alfa AF: 0.0000370 Hom.: 0

Bravo AF: 0.00000378

ClinVar

ClinVar submissions

Significance: Uncertain significance

Revision: criteria provided, single submitter

Pathogenic	VUS	Benign	Condition
-	1	-	not specified (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.15
BayesDel_addAF	Benign	-0.30	T
BayesDel_noAF	Benign	-0.57
CADD	Benign	17
DANN	Benign	0.92
DEOGEN2	Benign	0.021	T
Eigen	Benign	-0.72
Eigen_PC	Benign	-0.68
FATHMM_MKL	Benign	0.17	N
LIST_S2	Benign	0.72	T
M_CAP	Benign	0.022	T
MetaRNN	Benign	0.068	T
MetaSVM	Benign	-1.1	T
MutationAssessor	Benign	1.9	L
PhyloP100		0.80
PrimateAI	Benign	0.29	T
PROVEAN	Benign	-0.53	N
REVEL	Benign	0.068
Sift	Benign	0.11	T
Sift4G	Benign	0.099	T
Polyphen		0.068	B
Vest4		0.048
MVP		0.40
MPC		0.14
ClinPred		0.27	T
GERP RS		4.2
Varity_R		0.050
gMVP		0.44

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

Other links and lift over

dbSNP: rs762687220; hg19: chr18-3067280;