chr17-63971844-G-C

Variant names:

Variant summary

Our verdict is Benign. The variant received -21 ACMG points: 0P and 21B. BP4_StrongBP6_Very_StrongBP7BA1

The NM_000334.4(SCN4A):c.489C>G(p.Thr163Thr) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00902 in 1,576,938 control chromosomes in the GnomAD database, including 144 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Benign (★★).

Frequency

Genomes: 𝑓 0.0090 ( 16 hom., cov: 30)

Exomes 𝑓: 0.0090 ( 128 hom. )

Consequence

SCN4A
NM_000334.4 synonymous

Scores

Clinical Significance

Benign criteria provided, multiple submitters, no conflicts B:10

Conservation

PhyloP100: -0.0970

Publications

3 publications found

Variant links:

Genes affected

SCN4A (HGNC:10591): (sodium voltage-gated channel alpha subunit 4) Voltage-gated sodium channels are transmembrane glycoprotein complexes composed of a large alpha subunit with 24 transmembrane domains and one or more regulatory beta subunits. They are responsible for the generation and propagation of action potentials in neurons and muscle. This gene encodes one member of the sodium channel alpha subunit gene family. It is expressed in skeletal muscle, and mutations in this gene have been linked to several myotonia and periodic paralysis disorders. [provided by RefSeq, Jul 2008]

SCN4A Gene-Disease associations (from GenCC):

hyperkalemic periodic paralysis
Inheritance: AD Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Labcorp Genetics (formerly Invitae), G2P, Genomics England PanelApp, Orphanet
paramyotonia congenita of Von Eulenburg
Inheritance: AD Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Orphanet, G2P, Labcorp Genetics (formerly Invitae), Genomics England PanelApp, Laboratory for Molecular Medicine
SCN4A-related myopathy, autosomal recessive
Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: Illumina, ClinGen, PanelApp Australia
hypokalemic periodic paralysis, type 2
Inheritance: AD Classification: STRONG Submitted by: Labcorp Genetics (formerly Invitae), Genomics England PanelApp
potassium-aggravated myotonia
Inheritance: AD Classification: STRONG Submitted by: Labcorp Genetics (formerly Invitae)
congenital myasthenic syndrome 16
Inheritance: AR Classification: STRONG, LIMITED Submitted by: Genomics England PanelApp, Labcorp Genetics (formerly Invitae), Ambry Genetics
congenital myopathy
Inheritance: AR Classification: STRONG Submitted by: Genomics England PanelApp
congenital myopathy 22A, classic
Inheritance: AR Classification: STRONG Submitted by: Labcorp Genetics (formerly Invitae)
acetazolamide-responsive myotonia
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
hypokalemic periodic paralysis
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
myotonia fluctuans
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
myotonia permanens
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
postsynaptic congenital myasthenic syndrome
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

SCN4A links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -21 ACMG points.

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.55).

BP6

Variant 17-63971844-G-C is Benign according to our data. Variant chr17-63971844-G-C is described in ClinVar as Benign. ClinVar VariationId is 255858.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

BP7

Synonymous conserved (PhyloP=-0.097 with no splicing effect.

BA1

GnomAdExome4 highest subpopulation (MID) allele frequency at 95% confidence interval = 0.0541 is higher than 0.05.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_000334.4. 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
	SCN4A	NM_000334.4	MANE Select	c.489C>G	p.Thr163Thr	synonymous	Exon 4 of 24	NP_000325.4	P35499

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	SCN4A	ENST00000435607.3	TSL:1 MANE Select	c.489C>G	p.Thr163Thr	synonymous	Exon 4 of 24	ENSP00000396320.1	P35499

Frequencies

GnomAD3 genomes

AF:

0.00906

AC:

1139

AN:

125658

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00248

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00911

Gnomad ASJ

AF:

0.0600

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.0186

Gnomad FIN

AF:

0.00242

Gnomad MID

AF:

0.0513

Gnomad NFE

AF:

0.0108

Gnomad OTH

AF:

0.0277

GnomAD2 exomes

AF:

0.00995

AC:

2432

AN:

244512

AF XY:

0.0109

show subpopulations

Gnomad AFR exome

AF:

0.00126

Gnomad AMR exome

AF:

0.00602

Gnomad ASJ exome

AF:

0.0515

Gnomad EAS exome

AF:

0.000114

Gnomad FIN exome

AF:

0.00257

Gnomad NFE exome

AF:

0.00939

Gnomad OTH exome

AF:

0.0162

GnomAD4 exome

AF:

0.00902

AC:

13091

AN:

1451162

Hom.:

128

Cov.:

AF XY:

0.00961

AC XY:

6937

AN XY:

721686

show subpopulations

African (AFR)

AF:

0.00211

AC:

AN:

33148

American (AMR)

AF:

0.00602

AC:

266

AN:

44188

Ashkenazi Jewish (ASJ)

AF:

0.0508

AC:

1315

AN:

25868

East Asian (EAS)

AF:

0.0000512

AC:

AN:

39100

South Asian (SAS)

AF:

0.0173

AC:

1467

AN:

84636

European-Finnish (FIN)

AF:

0.00230

AC:

122

AN:

52988

Middle Eastern (MID)

AF:

0.0593

AC:

340

AN:

5730

European-Non Finnish (NFE)

AF:

0.00788

AC:

8716

AN:

1105646

Other (OTH)

AF:

0.0132

AC:

793

AN:

59858

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.463

Heterozygous variant carriers

606

1213

1819

2426

3032

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Exome Hom

Variant carriers

332

664

996

1328

1660

<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:

0.00905

AC:

1138

AN:

125776

Hom.:

Cov.:

AF XY:

0.00874

AC XY:

541

AN XY:

61896

show subpopulations

African (AFR)

AF:

0.00247

AC:

AN:

33174

American (AMR)

AF:

0.00910

AC:

116

AN:

12744

Ashkenazi Jewish (ASJ)

AF:

0.0600

AC:

174

AN:

2902

East Asian (EAS)

AF:

0.00

AC:

AN:

4252

South Asian (SAS)

AF:

0.0186

AC:

AN:

3984

European-Finnish (FIN)

AF:

0.00242

AC:

AN:

9492

Middle Eastern (MID)

AF:

0.0545

AC:

AN:

220

European-Non Finnish (NFE)

AF:

0.0108

AC:

611

AN:

56608

Other (OTH)

AF:

0.0273

AC:

AN:

1684

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.494

Heterozygous variant carriers

103

154

206

257

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Genome Hom

Variant carriers

100

<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:

0.0129

Hom.:

Bravo

AF:

0.00762

Asia WGS

AF:

0.00433

AC:

AN:

3478

ClinVar

ClinVar submissions

Significance:Benign

Revision:criteria provided, multiple submitters, no conflicts

View on ClinVar

Pathogenic

VUS

Benign

Condition

not specified (3)

Hyperkalemic periodic paralysis (2)

Congenital myasthenic syndrome 16 (1)

Hypokalemic periodic paralysis, type 2 (1)

not provided (1)

Paramyotonia congenita of Von Eulenburg (1)

Potassium-aggravated myotonia (1)

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.55

CADD

Benign

7.4

(source)

DANN

Benign

0.56

PhyloP100

-0.097

Mutation Taster

=99/1

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