Genetic Variant SCN3A:p.Arg1633Arg (chr2-165091254-A-T) – ACMG Classification: Benign (-14 pts)

Variant summary

Our verdict is Benign. The variant received -14 ACMG points: 0P and 14B. BP4_StrongBP6BP7BS1BS2

The NM_006922.4(SCN3A):c.4899T>A(p.Arg1633Arg) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000152 in 1,614,122 control chromosomes in the GnomAD database, including 3 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

Frequency

Genomes: 𝑓 0.000092 ( 0 hom., cov: 32)

Exomes 𝑓: 0.00016 ( 3 hom. )

Consequence

SCN3A
NM_006922.4 synonymous

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:1B:2

Conservation

PhyloP100: 0.297

Publications

0 publications found

Variant links:

Genes affected

SCN3A (HGNC:10590): (sodium voltage-gated channel alpha subunit 3) 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, and is found in a cluster of five alpha subunit genes on chromosome 2. Multiple transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Jul 2008]

SCN3A Gene-Disease associations (from GenCC):

genetic developmental and epileptic encephalopathy
Inheritance: AD Classification: DEFINITIVE Submitted by: Illumina, ClinGen
developmental and epileptic encephalopathy, 62
Inheritance: AD Classification: STRONG Submitted by: Labcorp Genetics (formerly Invitae)
epilepsy, familial focal, with variable foci 4
Inheritance: AD Classification: STRONG Submitted by: Labcorp Genetics (formerly Invitae), G2P
undetermined early-onset epileptic encephalopathy
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

SCN3A links:

ENSG00000236283 (HGNC:):

ENSG00000236283 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -14 ACMG points.

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.49).

BP6

Variant 2-165091254-A-T is Benign according to our data. Variant chr2-165091254-A-T is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 167649.

BP7

Synonymous conserved (PhyloP=0.297 with no splicing effect.

BS1

Variant frequency is greater than expected in population sas. GnomAd4 allele frequency = 0.0000919 (14/152284) while in subpopulation SAS AF = 0.00104 (5/4830). AF 95% confidence interval is 0.000408. There are 0 homozygotes in GnomAd4. There are 9 alleles in the male GnomAd4 subpopulation. Median coverage is 32. This position passed quality control check.

BS2

High AC in GnomAd4 at 14 AD gene.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_006922.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein
SCN3A	NM_006922.4	MANE Select	c.4899T>A	p.Arg1633Arg	synonymous	Exon 28 of 28	NP_008853.3
SCN3A	NM_001081676.2		c.4752T>A	p.Arg1584Arg	synonymous	Exon 28 of 28	NP_001075145.1
SCN3A	NM_001081677.2		c.4752T>A	p.Arg1584Arg	synonymous	Exon 28 of 28	NP_001075146.1

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein
SCN3A	ENST00000283254.12	TSL:1 MANE Select	c.4899T>A	p.Arg1633Arg	synonymous	Exon 28 of 28	ENSP00000283254.7
SCN3A	ENST00000409101.7	TSL:1	c.4752T>A	p.Arg1584Arg	synonymous	Exon 28 of 28	ENSP00000386726.3
SCN3A	ENST00000706067.1		c.4848T>A	p.Arg1616Arg	synonymous	Exon 28 of 28	ENSP00000516211.1

Frequencies

GnomAD3 genomes

AF:

0.0000986

AC:

AN:

152166

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000131

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00103

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00949

Gnomad NFE

AF:

0.0000588

Gnomad OTH

AF:

0.000478

GnomAD2 exomes

AF:

0.000247

AC:

AN:

251438

AF XY:

0.000339

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.0000868

Gnomad ASJ exome

AF:

0.0000992

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.000167

Gnomad OTH exome

AF:

0.000489

GnomAD4 exome

AF:

0.000158

AC:

231

AN:

1461838

Hom.:

Cov.:

AF XY:

0.000204

AC XY:

148

AN XY:

727224

show subpopulations

African (AFR)

AF:

0.0000299

AC:

AN:

33470

American (AMR)

AF:

0.000112

AC:

AN:

44712

Ashkenazi Jewish (ASJ)

AF:

0.0000383

AC:

AN:

26134

East Asian (EAS)

AF:

0.00

AC:

AN:

39698

South Asian (SAS)

AF:

0.00109

AC:

AN:

86258

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53420

Middle Eastern (MID)

AF:

0.00260

AC:

AN:

5768

European-Non Finnish (NFE)

AF:

0.0000836

AC:

AN:

1111986

Other (OTH)

AF:

0.000364

AC:

AN:

60392

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.477

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Exome Hom

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:

0.0000919

AC:

AN:

152284

Hom.:

Cov.:

AF XY:

0.000121

AC XY:

AN XY:

74454

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

41540

American (AMR)

AF:

0.000131

AC:

AN:

15292

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3472

East Asian (EAS)

AF:

0.00

AC:

AN:

5172

South Asian (SAS)

AF:

0.00104

AC:

AN:

4830

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10626

Middle Eastern (MID)

AF:

0.00680

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.0000588

AC:

AN:

68032

Other (OTH)

AF:

0.000473

AC:

AN:

2114

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.538

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:

0.000203

Hom.:

Bravo

AF:

0.000128

EpiCase

AF:

0.000164

EpiControl

AF:

0.000178

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:1Benign:2

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not provided

Uncertain:1Benign:2

Oct 31, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Jul 01, 2025

CeGaT Center for Human Genetics Tuebingen

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

SCN3A: BP4, BP7, BS1

Mar 17, 2014

Eurofins Ntd Llc (ga)

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.49

CADD

Benign

(source)

DANN

Benign

0.82

PhyloP100

0.30

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

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

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

Age Distribution

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over