Genetic Variant MYOM2:p.Val321Met (chr8-2073341-G-A) – ACMG Classification: Uncertain_significance (1 pts)

Variant summary

Our verdict is Uncertain significance. The variant received 1 ACMG points: 2P and 1B. PM2BP4

The NM_003970.4(MYOM2):c.961G>A(p.Val321Met) variant causes a missense, splice region change. The variant allele was found at a frequency of 0.0000792 in 1,603,418 control chromosomes in the GnomAD database, including 1 homozygotes. In-silico tool predicts a benign outcome for this variant. 12/20 in silico tools predict a benign outcome for this variant. 1/1 splice prediction tools predict no significant impact on normal splicing. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. V321L) has been classified as Benign.

Frequency

Genomes: 𝑓 0.00011 ( 0 hom., cov: 33)

Exomes 𝑓: 0.000076 ( 1 hom. )

Consequence

MYOM2
NM_003970.4 missense, splice_region

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: 5.97

Publications

29 publications found

Variant links:

Genes affected

MYOM2 (HGNC:7614): (myomesin 2) 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 and 165 kD. The predicted MYOM2 protein contains 1,465 amino acids. Like MYOM1, MYOM2 has a unique N-terminal domain followed by 12 repeat domains with strong homology to either fibronectin type III or immunoglobulin C2 domains. Protein sequence comparisons suggested that the MYOM2 protein and bovine M protein are identical. [provided by RefSeq, Jul 2008]

MYOM2 links:

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ACMG classification

Classification was made for transcript

Our verdict: Uncertain_significance. The variant received 1 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.2814666).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_003970.4. 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
	MYOM2	NM_003970.4	MANE Select	c.961G>A	p.Val321Met	missense splice_region	Exon 10 of 37	NP_003961.3

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein
MYOM2	ENST00000262113.9	TSL:1 MANE Select	c.961G>A	p.Val321Met	missense splice_region	Exon 10 of 37	ENSP00000262113.4
MYOM2	ENST00000887732.1		c.961G>A	p.Val321Met	missense splice_region	Exon 10 of 38	ENSP00000557791.1
MYOM2	ENST00000887733.1		c.961G>A	p.Val321Met	missense splice_region	Exon 10 of 38	ENSP00000557792.1

Frequencies

GnomAD3 genomes

AF:

0.000105

AC:

AN:

152040

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000241

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00346

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000441

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.000159

AC:

AN:

245544

AF XY:

0.000165

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00331

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000626

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000765

AC:

111

AN:

1451378

Hom.:

Cov.:

AF XY:

0.0000832

AC XY:

AN XY:

720956

show subpopulations

African (AFR)

AF:

0.0000303

AC:

AN:

32954

American (AMR)

AF:

0.00

AC:

AN:

42894

Ashkenazi Jewish (ASJ)

AF:

0.00322

AC:

AN:

25760

East Asian (EAS)

AF:

0.00

AC:

AN:

39448

South Asian (SAS)

AF:

0.00

AC:

AN:

85334

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53206

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5706

European-Non Finnish (NFE)

AF:

0.0000145

AC:

AN:

1106198

Other (OTH)

AF:

0.000184

AC:

AN:

59878

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.505

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome 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

GnomAD4 genome

AF:

0.000105

AC:

AN:

152040

Hom.:

Cov.:

AF XY:

0.0000539

AC XY:

AN XY:

74242

show subpopulations

African (AFR)

AF:

0.0000241

AC:

AN:

41426

American (AMR)

AF:

0.00

AC:

AN:

15274

Ashkenazi Jewish (ASJ)

AF:

0.00346

AC:

AN:

3472

East Asian (EAS)

AF:

0.00

AC:

AN:

5158

South Asian (SAS)

AF:

0.00

AC:

AN:

4834

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10576

Middle Eastern (MID)

AF:

0.00

AC:

AN:

316

European-Non Finnish (NFE)

AF:

0.0000441

AC:

AN:

67988

Other (OTH)

AF:

0.00

AC:

AN:

2084

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.488

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:

0.0000285

Hom.:

39969

ExAC

AF:

0.000173

AC:

EpiCase

AF:

0.0000545

EpiControl

AF:

0.000119

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.22

BayesDel_addAF

Benign

-0.12

BayesDel_noAF

Benign

-0.25

CADD

Benign

(source)

DANN

Uncertain

0.99

Eigen

Uncertain

0.25

Eigen_PC

Benign

0.20

FATHMM_MKL

Uncertain

0.96

M_CAP

Benign

0.016

MetaRNN

Benign

0.28

MetaSVM

Benign

-0.37

PhyloP100

6.0

PrimateAI

Uncertain

0.69

PROVEAN

Benign

-1.1

REVEL

Benign

0.22

Sift

Benign

0.12

Sift4G

Uncertain

0.029

Vest4

0.59

MutPred

0.51

Gain of sheet (P = 0.0827)

MVP

0.62

MPC

0.035

ClinPred

0.15

GERP RS

4.6

gMVP

0.56

Mutation Taster

=86/14

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

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

Age Distribution

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over