NM_003803.4:c.1736C>T

Variant names:

• chr18-3151801-G-A
• rs185573271
• NM_003803.4:c.1736C>T

Variant summary

Our verdict is Likely benign. The variant received -3 ACMG points: 1P and 4B. PP3 BS2

The NM_003803.4(MYOM1):​c.1736C>T​(p.Ser579Phe) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000278 in 1,613,918 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★).

• Frequency:
  • Genomes: 𝑓 0.00030 (0 hom., cov: 32)
  • Exomes 𝑓: 0.00028 (0 hom.)
• Consequence: MYOM1 NM_003803.4 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:2
• Conservation: PhyloP100: 7.95
• Publications: 4 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 -3 ACMG points.

• PP3: MetaRNN computational evidence supports a deleterious effect, 0.748
• BS2: High AC in GnomAd4 at 45 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

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	MYOM1	NM_003803.4	MANE Select	c.1736C>T	p.Ser579Phe	missense	Exon 12 of 38	NP_003794.3
	MYOM1	NM_019856.2		c.1736C>T	p.Ser579Phe	missense	Exon 12 of 37	NP_062830.1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	MYOM1	ENST00000356443.9	TSL:1 MANE Select	c.1736C>T	p.Ser579Phe	missense	Exon 12 of 38	ENSP00000348821.4
	MYOM1	ENST00000261606.11	TSL:1	c.1736C>T	p.Ser579Phe	missense	Exon 12 of 37	ENSP00000261606.7
	MYOM1	ENST00000941943.1		c.1736C>T	p.Ser579Phe	missense	Exon 12 of 38	ENSP00000612002.1

Frequencies

GnomAD3 genomes AF: 0.000296 AC: 45 AN: 152174 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.0000241

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00118

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: 0.000367

Gnomad OTH AF: 0.000478

GnomAD2 exomes AF: 0.000185 AC: 46 AN: 249190 AF XY: 0.000148

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.000522

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.000239

Gnomad OTH exome AF: 0.000165

GnomAD4 exome AF: 0.000276 AC: 404 AN: 1461626 Hom.: 0 Cov.: 30 AF XY: 0.000263 AC XY: 191 AN XY: 727098

African (AFR) AF: 0.00 AC: 0 AN: 33478

American (AMR) AF: 0.000581 AC: 26 AN: 44722

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26136

East Asian (EAS) AF: 0.00 AC: 0 AN: 39698

South Asian (SAS) AF: 0.00 AC: 0 AN: 86248

European-Finnish (FIN) AF: 0.0000187 AC: 1 AN: 53398

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5768

European-Non Finnish (NFE) AF: 0.000318 AC: 353 AN: 1111806

Other (OTH) AF: 0.000398 AC: 24 AN: 60372

GnomAD4 genome AF: 0.000295 AC: 45 AN: 152292 Hom.: 0 Cov.: 32 AF XY: 0.000282 AC XY: 21 AN XY: 74468

African (AFR) AF: 0.0000241 AC: 1 AN: 41564

American (AMR) AF: 0.00118 AC: 18 AN: 15296

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3470

East Asian (EAS) AF: 0.00 AC: 0 AN: 5178

South Asian (SAS) AF: 0.00 AC: 0 AN: 4826

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10616

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 294

European-Non Finnish (NFE) AF: 0.000368 AC: 25 AN: 68022

Other (OTH) AF: 0.000473 AC: 1 AN: 2114

Alfa AF: 0.000324 Hom.: 0

Bravo AF: 0.000302

TwinsUK AF: 0.000539 AC: 2

ALSPAC AF: 0.000519 AC: 2

ESP6500AA AF: 0.00 AC: 0

ESP6500EA AF: 0.000241 AC: 2

ExAC AF: 0.000149 AC: 18

EpiCase AF: 0.000327

EpiControl AF: 0.0000593

ClinVar

ClinVar submissions as Germline

Significance: Uncertain significance

Revision: criteria provided, multiple submitters, no conflicts

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

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.70
BayesDel_addAF	Uncertain	0.071	D
BayesDel_noAF	Pathogenic	0.21
CADD	Pathogenic	27
DANN	Uncertain	1.0
DEOGEN2	Benign	0.24	T
Eigen	Pathogenic	0.82
Eigen_PC	Pathogenic	0.78
FATHMM_MKL	Uncertain	0.96	D
LIST_S2	Uncertain	0.88	D
M_CAP	Benign	0.075	D
MetaRNN	Pathogenic	0.75	D
MetaSVM	Benign	-0.28	T
MutationAssessor	Benign	1.9	L
PhyloP100		7.9
PrimateAI	Uncertain	0.74	T
PROVEAN	Pathogenic	-5.3	D
REVEL	Uncertain	0.60
Sift	Uncertain	0.027	D
Sift4G	Pathogenic	0.0	D
Polyphen		1.0	D
Vest4		0.93
MVP		0.87
MPC		0.65
ClinPred		0.60	D
GERP RS		4.9
Varity_R		0.86
gMVP		0.60
Mutation Taster		=29/71	disease causing

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: rs185573271; hg19: chr18-3151799;