17-63941743-G-T

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.4539C>A(p.Ile1513Ile) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.179 in 1,613,846 control chromosomes in the GnomAD database, including 26,654 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Benign (★★). Synonymous variant affecting the same amino acid position (i.e. I1513I) has been classified as Likely benign.

Frequency

Genomes: 𝑓 0.17 ( 2149 hom., cov: 31)

Exomes 𝑓: 0.18 ( 24505 hom. )

Consequence

SCN4A
NM_000334.4 synonymous

Scores

Clinical Significance

Benign criteria provided, multiple submitters, no conflicts B:12

Conservation

PhyloP100: -0.00800

Publications

11 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=-0.49).

BP6

Variant 17-63941743-G-T is Benign according to our data. Variant chr17-63941743-G-T is described in ClinVar as Benign. ClinVar VariationId is 92863.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

BP7

Synonymous conserved (PhyloP=-0.008 with no splicing effect.

BA1

GnomAd4 highest subpopulation (NFE) allele frequency at 95% confidence interval = 0.189 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.4539C>A	p.Ile1513Ile	synonymous	Exon 24 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.4539C>A	p.Ile1513Ile	synonymous	Exon 24 of 24	ENSP00000396320.1	P35499

Frequencies

GnomAD3 genomes

AF:

0.167

AC:

25329

AN:

151860

Hom.:

2148

Cov.:

show subpopulations

Gnomad AFR

AF:

0.133

Gnomad AMI

AF:

0.219

Gnomad AMR

AF:

0.167

Gnomad ASJ

AF:

0.213

Gnomad EAS

AF:

0.100

Gnomad SAS

AF:

0.130

Gnomad FIN

AF:

0.159

Gnomad MID

AF:

0.269

Gnomad NFE

AF:

0.192

Gnomad OTH

AF:

0.182

GnomAD2 exomes

AF:

0.166

AC:

41536

AN:

250938

AF XY:

0.168

show subpopulations

Gnomad AFR exome

AF:

0.133

Gnomad AMR exome

AF:

0.146

Gnomad ASJ exome

AF:

0.210

Gnomad EAS exome

AF:

0.0966

Gnomad FIN exome

AF:

0.159

Gnomad NFE exome

AF:

0.193

Gnomad OTH exome

AF:

0.171

GnomAD4 exome

AF:

0.181

AC:

263923

AN:

1461868

Hom.:

24505

Cov.:

AF XY:

0.180

AC XY:

130972

AN XY:

727234

show subpopulations

African (AFR)

AF:

0.132

AC:

4431

AN:

33480

American (AMR)

AF:

0.149

AC:

6660

AN:

44724

Ashkenazi Jewish (ASJ)

AF:

0.217

AC:

5682

AN:

26136

East Asian (EAS)

AF:

0.0890

AC:

3533

AN:

39700

South Asian (SAS)

AF:

0.136

AC:

11694

AN:

86258

European-Finnish (FIN)

AF:

0.160

AC:

8557

AN:

53420

Middle Eastern (MID)

AF:

0.220

AC:

1270

AN:

5768

European-Non Finnish (NFE)

AF:

0.190

AC:

211633

AN:

1111988

Other (OTH)

AF:

0.173

AC:

10463

AN:

60394

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.482

Heterozygous variant carriers

14459

28918

43377

57836

72295

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Exome Hom

Variant carriers

7244

14488

21732

28976

36220

<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:

0.167

AC:

25345

AN:

151978

Hom.:

2149

Cov.:

AF XY:

0.165

AC XY:

12282

AN XY:

74262

show subpopulations

African (AFR)

AF:

0.134

AC:

5537

AN:

41448

American (AMR)

AF:

0.167

AC:

2549

AN:

15260

Ashkenazi Jewish (ASJ)

AF:

0.213

AC:

738

AN:

3468

East Asian (EAS)

AF:

0.0998

AC:

515

AN:

5158

South Asian (SAS)

AF:

0.129

AC:

623

AN:

4814

European-Finnish (FIN)

AF:

0.159

AC:

1683

AN:

10552

Middle Eastern (MID)

AF:

0.269

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.192

AC:

13042

AN:

67958

Other (OTH)

AF:

0.179

AC:

379

AN:

2114

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.505

Heterozygous variant carriers

1071

2142

3212

4283

5354

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Genome Hom

Variant carriers

264

528

792

1056

1320

<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:

0.185

Hom.:

2080

Bravo

AF:

0.165

Asia WGS

AF:

0.0900

AC:

315

AN:

3478

EpiCase

AF:

0.203

EpiControl

AF:

0.198

ClinVar

ClinVar submissions

Significance:Benign

Revision:criteria provided, multiple submitters, no conflicts

View on ClinVar

Pathogenic

VUS

Benign

Condition

not specified (4)

Hyperkalemic periodic paralysis (2)

not provided (2)

Congenital myasthenic syndrome 16 (1)

Hypokalemic periodic paralysis, type 2 (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

-0.49

CADD

Benign

0.47

(source)

DANN

Benign

0.75

PhyloP100

-0.0080

Mutation Taster

=100/0

polymorphism (auto)

(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