NM_000334.4:c.2631T>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.2631T>C(p.Asp877Asp) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0298 in 1,603,246 control chromosomes in the GnomAD database, including 3,096 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Benign (★★).

Frequency

Genomes: 𝑓 0.088 ( 1496 hom., cov: 32)

Exomes 𝑓: 0.024 ( 1600 hom. )

Consequence

SCN4A
NM_000334.4 synonymous

Scores

Clinical Significance

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

Conservation

PhyloP100: -4.80

Publications

6 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=-0.9).

BP6

Variant 17-63951646-A-G is Benign according to our data. Variant chr17-63951646-A-G is described in ClinVar as Benign. ClinVar VariationId is 92861.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

BP7

Synonymous conserved (PhyloP=-4.8 with no splicing effect.

BA1

GnomAd4 highest subpopulation (AFR) allele frequency at 95% confidence interval = 0.261 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.2631T>C	p.Asp877Asp	synonymous	Exon 14 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.2631T>C	p.Asp877Asp	synonymous	Exon 14 of 24	ENSP00000396320.1	P35499

Frequencies

GnomAD3 genomes

AF:

0.0874

AC:

13270

AN:

151798

Hom.:

1489

Cov.:

show subpopulations

Gnomad AFR

AF:

0.265

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.0388

Gnomad ASJ

AF:

0.0409

Gnomad EAS

AF:

0.0166

Gnomad SAS

AF:

0.0295

Gnomad FIN

AF:

0.00359

Gnomad MID

AF:

0.0538

Gnomad NFE

AF:

0.0175

Gnomad OTH

AF:

0.0648

GnomAD2 exomes

AF:

0.0349

AC:

8000

AN:

229282

AF XY:

0.0322

show subpopulations

Gnomad AFR exome

AF:

0.265

Gnomad AMR exome

AF:

0.0225

Gnomad ASJ exome

AF:

0.0446

Gnomad EAS exome

AF:

0.0164

Gnomad FIN exome

AF:

0.00370

Gnomad NFE exome

AF:

0.0176

Gnomad OTH exome

AF:

0.0277

GnomAD4 exome

AF:

0.0238

AC:

34538

AN:

1451330

Hom.:

1600

Cov.:

AF XY:

0.0233

AC XY:

16809

AN XY:

721212

show subpopulations

African (AFR)

AF:

0.275

AC:

9141

AN:

33292

American (AMR)

AF:

0.0245

AC:

1053

AN:

42940

Ashkenazi Jewish (ASJ)

AF:

0.0468

AC:

1213

AN:

25936

East Asian (EAS)

AF:

0.0137

AC:

539

AN:

39202

South Asian (SAS)

AF:

0.0301

AC:

2557

AN:

84926

European-Finnish (FIN)

AF:

0.00424

AC:

223

AN:

52592

Middle Eastern (MID)

AF:

0.0527

AC:

303

AN:

5750

European-Non Finnish (NFE)

AF:

0.0158

AC:

17469

AN:

1106766

Other (OTH)

AF:

0.0340

AC:

2040

AN:

59926

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.478

Heterozygous variant carriers

1951

3902

5854

7805

9756

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Exome Hom

Variant carriers

796

1592

2388

3184

3980

<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:

0.0876

AC:

13307

AN:

151916

Hom.:

1496

Cov.:

AF XY:

0.0845

AC XY:

6274

AN XY:

74244

show subpopulations

African (AFR)

AF:

0.265

AC:

10969

AN:

41382

American (AMR)

AF:

0.0387

AC:

591

AN:

15268

Ashkenazi Jewish (ASJ)

AF:

0.0409

AC:

142

AN:

3468

East Asian (EAS)

AF:

0.0166

AC:

AN:

5170

South Asian (SAS)

AF:

0.0297

AC:

143

AN:

4812

European-Finnish (FIN)

AF:

0.00359

AC:

AN:

10574

Middle Eastern (MID)

AF:

0.0510

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.0175

AC:

1188

AN:

67932

Other (OTH)

AF:

0.0641

AC:

135

AN:

2106

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.503

Heterozygous variant carriers

516

1032

1549

2065

2581

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Genome Hom

Variant carriers

124

248

372

496

620

<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:

0.0400

Hom.:

225

Bravo

AF:

0.0976

Asia WGS

AF:

0.0450

AC:

158

AN:

3478

ClinVar

ClinVar submissions

Significance:Benign

Revision:criteria provided, multiple submitters, no conflicts

View on ClinVar

Pathogenic

VUS

Benign

Condition

not specified (5)

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

-0.90

CADD

Benign

0.013

(source)

DANN

Benign

0.40

PhyloP100

-4.8

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