rs199476083

Variant names:

Your query was ambiguous. Multiple possible variants found:

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 3P and 1B. PM1PP5BS1_Supporting

The NM_005592.4(MUSK):c.2368G>A(p.Val790Met) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000126 in 1,613,878 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

Frequency

Genomes: 𝑓 0.00016 ( 0 hom., cov: 32)

Exomes 𝑓: 0.00012 ( 0 hom. )

Consequence

MUSK
NM_005592.4 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:7U:2

Conservation

PhyloP100: 10.0

Publications

27 publications found

Variant links:

Genes affected

MUSK (HGNC:7525): (muscle associated receptor tyrosine kinase) This gene encodes a muscle-specific tyrosine kinase receptor. The encoded protein may play a role in clustering of the acetylcholine receptor in the postsynaptic neuromuscular junction. Mutations in this gene have been associated with congenital myasthenic syndrome. Alternatively spliced transcript variants have been described.[provided by RefSeq, Oct 2009]

MUSK Gene-Disease associations (from GenCC):

congenital myasthenic syndrome 9
Inheritance: AR Classification: STRONG Submitted by: Genomics England PanelApp, Labcorp Genetics (formerly Invitae), PanelApp Australia
fetal akinesia deformation sequence 1
Inheritance: AR Classification: STRONG, SUPPORTIVE Submitted by: Orphanet, Labcorp Genetics (formerly Invitae)
postsynaptic congenital myasthenic syndrome
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

MUSK links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Uncertain_significance. The variant received 2 ACMG points.

PM1

In a hotspot region, there are 3 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 7 uncertain in NM_005592.4

PP5

Variant 9-110800746-G-A is Pathogenic according to our data. Variant chr9-110800746-G-A is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 8239.

BS1

Variant frequency is greater than expected in population amr. GnomAd4 allele frequency = 0.000164 (25/152166) while in subpopulation AMR AF = 0.000589 (9/15284). AF 95% confidence interval is 0.000307. There are 0 homozygotes in GnomAd4. There are 10 alleles in the male GnomAd4 subpopulation. Median coverage is 32. This position passed quality control check. Existence of Clinvar submissions makes me limit the strength of this signal to Supporting

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
MUSK	NM_005592.4 link	c.2368G>A	p.Val790Met	missense_variant	Exon 15 of 15	ENST00000374448.9	NP_005583.1	O15146-1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
MUSK	ENST00000374448.9 link	c.2368G>A	p.Val790Met	missense_variant	Exon 15 of 15	5	NM_005592.4	ENSP00000363571.4	O15146-1
MUSK	ENST00000416899.7 link	c.2344G>A	p.Val782Met	missense_variant	Exon 14 of 14	5		ENSP00000393608.3	A0A087WSY1
MUSK	ENST00000189978.10 link	c.2110G>A	p.Val704Met	missense_variant	Exon 14 of 14	5		ENSP00000189978.6	O15146-2

Frequencies

GnomAD3 genomes

AF:

0.000164

AC:

AN:

152166

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000145

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000589

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:

0.000147

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.000229

AC:

AN:

249208

AF XY:

0.000207

show subpopulations

Gnomad AFR exome

AF:

0.0000646

Gnomad AMR exome

AF:

0.000435

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.0000464

Gnomad NFE exome

AF:

0.000292

Gnomad OTH exome

AF:

0.000992

GnomAD4 exome

AF:

0.000122

AC:

178

AN:

1461712

Hom.:

Cov.:

AF XY:

0.000127

AC XY:

AN XY:

727138

show subpopulations

African (AFR)

AF:

0.000179

AC:

AN:

33480

American (AMR)

AF:

0.000514

AC:

AN:

44724

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26136

East Asian (EAS)

AF:

0.00

AC:

AN:

39700

South Asian (SAS)

AF:

0.0000232

AC:

AN:

86258

European-Finnish (FIN)

AF:

0.0000562

AC:

AN:

53404

Middle Eastern (MID)

AF:

0.000173

AC:

AN:

5768

European-Non Finnish (NFE)

AF:

0.000113

AC:

126

AN:

1111868

Other (OTH)

AF:

0.000282

AC:

AN:

60374

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.487

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:

0.000164

AC:

AN:

152166

Hom.:

Cov.:

AF XY:

0.000135

AC XY:

AN XY:

74326

show subpopulations

African (AFR)

AF:

0.000145

AC:

AN:

41430

American (AMR)

AF:

0.000589

AC:

AN:

15284

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3472

East Asian (EAS)

AF:

0.00

AC:

AN:

5186

South Asian (SAS)

AF:

0.00

AC:

AN:

4832

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10604

Middle Eastern (MID)

AF:

0.00

AC:

AN:

314

European-Non Finnish (NFE)

AF:

0.000147

AC:

AN:

68048

Other (OTH)

AF:

0.00

AC:

AN:

2084

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.539

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:

0.000205

Hom.:

Bravo

AF:

0.000329

TwinsUK

AF:

0.00

AC:

ALSPAC

AF:

0.000259

AC:

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.000357

AC:

ExAC

AF:

0.000265

AC:

EpiCase

AF:

0.000273

EpiControl

AF:

0.000237

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Pathogenic:7Uncertain:2

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not provided

Pathogenic:2Uncertain:1

Jul 26, 2025

GeneDx

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

In silico analysis supports that this missense variant has a deleterious effect on protein structure/function; This variant is associated with the following publications: (PMID: 27588369, 24122059, 31892318, 20371544, 16794080, 25562515, 30429133, 34426522, 15496425, 25537362) -

Jul 09, 2015

Eurofins Ntd Llc (ga)

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Feb 21, 2020

Revvity Omics, Revvity

Significance:Likely pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Fetal akinesia deformation sequence 1;C4225368:Congenital myasthenic syndrome 9

Pathogenic:2

Dec 16, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This sequence change replaces valine, which is neutral and non-polar, with methionine, which is neutral and non-polar, at codon 790 of the MUSK protein (p.Val790Met). This variant is present in population databases (rs199476083, gnomAD 0.04%). This missense change has been observed in individuals with congenital myasthenic syndrome (CMS) (PMID: 15496425, 24122059, 30429133). It has also been observed to segregate with disease in related individuals. ClinVar contains an entry for this variant (Variation ID: 8239). Invitae Evidence Modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) indicates that this missense variant is expected to disrupt MUSK protein function with a positive predictive value of 80%. Experimental studies have shown that this missense change affects MUSK function (PMID: 15496425, 23326516). For these reasons, this variant has been classified as Pathogenic. -

Apr 10, 2024

Fulgent Genetics, Fulgent Genetics

Significance:Likely pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Congenital myasthenic syndrome 9

Pathogenic:2

Baylor Genetics

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Dec 15, 2004

OMIM

Significance:Pathogenic

Review Status:no assertion criteria provided

Collection Method:literature only

- -

MUSK-related disorder

Pathogenic:1

Dec 14, 2023

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Significance:Likely pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Variant summary: MUSK c.2368G>A (p.Val790Met) results in a conservative amino acid change located in the Protein kinase domain (IPR000719) of the encoded protein sequence. Three of five in-silico tools predict a damaging effect of the variant on protein function. The variant allele was found at a frequency of 0.00023 in 249208 control chromosomes. c.2368G>A has been reported in the literature in multiple compound heterozygous individuals affected with congenital myasthenis syndrome (e.g. Chevessier_2004, Maggi_2015, Younas_2018). These data indicate that the variant is likely to be associated with disease. At least one publication reports experimental evidence evaluating an impact on protein function. The most pronounced variant effects were reduced protein levels and stability in vitro, altered agrin-dependent acetylcholine receptor aggregation in vitro, and disassociation of nerve terminals with acetylcholine aggregates in vivo (e.g. Chevessier_2004, BenAmmar_2013). The following publications have been ascertained in the context of this evaluation (PMID: 23326516, 15496425, 24122059, 30429133). Five submitters have cited clinical-significance assessments for this variant to ClinVar after 2014, classifying the variant as pathogenic (n=2), likely pathogenic (n=1), or uncertain significance (n=2). Based on the evidence outlined above, the variant was classified as likely pathogenic. -

Fetal akinesia deformation sequence 1

Uncertain:1

Feb 07, 2020

Baylor Genetics

Significance:Uncertain significance

Review Status:flagged submission

Collection Method:clinical testing

This variant was determined to be of uncertain significance according to ACMG Guidelines, 2015 [PMID:25741868]. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.83

BayesDel_addAF

Uncertain

0.088

BayesDel_noAF

Pathogenic

0.21

CADD

Pathogenic

(source)

DANN

Pathogenic

1.0

DEOGEN2

Uncertain

0.60

D;.;.;.

Eigen

Pathogenic

0.88

Eigen_PC

Pathogenic

0.86

FATHMM_MKL

Pathogenic

0.99

LIST_S2

Pathogenic

0.98

D;D;D;D

M_CAP

Benign

0.055

MetaRNN

Uncertain

0.70

D;D;D;D

MetaSVM

Uncertain

-0.22

MutationAssessor

Uncertain

2.1

M;.;.;.

PhyloP100

PrimateAI

Pathogenic

0.81

PROVEAN

Uncertain

-2.9

D;.;.;.

REVEL

Pathogenic

0.66

Sift

Uncertain

0.0010

D;.;.;.

Sift4G

Pathogenic

0.0010

D;D;D;D

Polyphen

1.0

D;.;.;.

Vest4

0.94

MVP

0.68

MPC

0.69

ClinPred

0.23

GERP RS

5.3

Varity_R

0.81

gMVP

0.88

Mutation Taster

=2/98

disease causing (ClinVar)

(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

You must be logged in to view publications. This limit was set because tens of millions (!) of queries from AI bots are generated daily.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over