Genetic Variant MYOM2:p.Arg123Cys (chr8-2057451-C-T) – ACMG Classification: Benign (-9 pts)

Variant summary

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

The NM_003970.4(MYOM2):c.367C>T(p.Arg123Cys) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000654 in 1,614,002 control chromosomes in the GnomAD database, including 6 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Benign (no stars).

Frequency

Genomes: 𝑓 0.0033 ( 4 hom., cov: 33)

Exomes 𝑓: 0.00037 ( 2 hom. )

Consequence

MYOM2
NM_003970.4 missense

Scores

Clinical Significance

Benign no assertion criteria provided B:1

Conservation

PhyloP100: 2.86

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:

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=0.007532537).

BP6

Variant 8-2057451-C-T is Benign according to our data. Variant chr8-2057451-C-T is described in ClinVar as [Benign]. Clinvar id is 3033344.Status of the report is no_assertion_criteria_provided, 0 stars.

BS2

High Homozygotes in GnomAd4 at 4 AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
MYOM2	NM_003970.4 link	c.367C>T	p.Arg123Cys	missense_variant	Exon 4 of 37	ENST00000262113.9	NP_003961.3	P54296

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
MYOM2	ENST00000262113.9 link	c.367C>T	p.Arg123Cys	missense_variant	Exon 4 of 37	1	NM_003970.4	ENSP00000262113.4		P54296
MYOM2	ENST00000523438.1 link	c.-82+12283C>T		intron_variant	Intron 1 of 23	2		ENSP00000428396.1		E7EWH9

Frequencies

GnomAD3 genomes

AF:

0.00336

AC:

511

AN:

152152

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0118

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000589

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.000207

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000735

Gnomad OTH

AF:

0.00287

GnomAD3 exomes

AF:

0.000902

AC:

226

AN:

250672

Hom.:

AF XY:

0.000627

AC XY:

AN XY:

135606

show subpopulations

Gnomad AFR exome

AF:

0.0124

Gnomad AMR exome

AF:

0.000405

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.0000327

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000529

Gnomad OTH exome

AF:

0.000654

GnomAD4 exome

AF:

0.000373

AC:

545

AN:

1461732

Hom.:

Cov.:

AF XY:

0.000297

AC XY:

216

AN XY:

727162

show subpopulations

Gnomad4 AFR exome

AF:

0.0132

Gnomad4 AMR exome

AF:

0.000403

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.0000232

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000351

Gnomad4 OTH exome

AF:

0.000745

GnomAD4 genome

AF:

0.00335

AC:

510

AN:

152270

Hom.:

Cov.:

AF XY:

0.00314

AC XY:

234

AN XY:

74456

show subpopulations

Gnomad4 AFR

AF:

0.0118

Gnomad4 AMR

AF:

0.000589

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.000207

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000735

Gnomad4 OTH

AF:

0.00284

Alfa

AF:

0.000544

Hom.:

Bravo

AF:

0.00376

TwinsUK

AF:

0.00

AC:

ALSPAC

AF:

0.000259

AC:

ESP6500AA

AF:

0.0109

AC:

ESP6500EA

AF:

0.00

AC:

ExAC

AF:

0.00110

AC:

134

Asia WGS

AF:

0.000577

AC:

AN:

3478

EpiCase

AF:

0.00

EpiControl

AF:

0.0000593

ClinVar

Significance: Benign

Submissions summary: Benign:1

Revision: no assertion criteria provided

LINK: link

Submissions by phenotype

MYOM2-related disorder

Benign:1

Mar 22, 2019

PreventionGenetics, part of Exact Sciences

Significance: Benign

Review Status: no assertion criteria provided

Collection Method: clinical testing

This variant is classified as benign based on ACMG/AMP sequence variant interpretation guidelines (Richards et al. 2015 PMID: 25741868, with internal and published modifications). -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Uncertain

0.43

BayesDel_addAF

Benign

-0.44

BayesDel_noAF

Benign

-0.40

CADD

Uncertain

DANN

Uncertain

1.0

Eigen

Benign

-0.051

Eigen_PC

Benign

-0.21

FATHMM_MKL

Benign

0.16

MetaRNN

Benign

0.0075

MetaSVM

Benign

-0.87

PrimateAI

Benign

0.24

PROVEAN

Pathogenic

-5.0

REVEL

Benign

0.17

Sift

Pathogenic

0.0

Sift4G

Pathogenic

0.0

Vest4

0.60

MVP

0.64

MPC

0.033

ClinPred

0.080

GERP RS

3.7

gMVP

0.53

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