Genetic Variant SCN5A:p.Val1532Ile (chr3-38554498-C-T) – ACMG Classification: Benign (-13 pts)

Variant summary

Our verdict is Benign. The variant received -13 ACMG points: 0P and 13B. BP4_StrongBP6BS1BS2

The NM_000335.5(SCN5A):c.4591G>A(p.Val1531Ile) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000144 in 1,613,776 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). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. V1531F) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.00025 ( 0 hom., cov: 31)

Exomes 𝑓: 0.00013 ( 3 hom. )

Consequence

SCN5A
NM_000335.5 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:2B:6O:1

Conservation

PhyloP100: 2.58

Publications

5 publications found

Variant links:

Genes affected

SCN5A (HGNC:10593): (sodium voltage-gated channel alpha subunit 5) The protein encoded by this gene is an integral membrane protein and tetrodotoxin-resistant voltage-gated sodium channel subunit. This protein is found primarily in cardiac muscle and is responsible for the initial upstroke of the action potential in an electrocardiogram. Defects in this gene have been associated with long QT syndrome type 3 (LQT3), atrial fibrillation, cardiomyopathy, and Brugada syndrome 1, all autosomal dominant cardiac diseases. Alternative splicing results in several transcript variants encoding different isoforms. [provided by RefSeq, May 2022]

SCN5A Gene-Disease associations (from GenCC):

Brugada syndrome
Inheritance: AD Classification: DEFINITIVE, SUPPORTIVE Submitted by: Orphanet, ClinGen
Brugada syndrome 1
Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: Labcorp Genetics (formerly Invitae), Laboratory for Molecular Medicine, Genomics England PanelApp, G2P, Ambry Genetics
cardiac rhythm disease
Inheritance: AD Classification: DEFINITIVE Submitted by: ClinGen
dilated cardiomyopathy
Inheritance: AD Classification: DEFINITIVE Submitted by: ClinGen
dilated cardiomyopathy 1E
Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: Labcorp Genetics (formerly Invitae), G2P, Ambry Genetics
familial long QT syndrome
Inheritance: AD Classification: DEFINITIVE Submitted by: ClinGen
long QT syndrome 3
Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: Labcorp Genetics (formerly Invitae), G2P, Ambry Genetics
progressive familial heart block, type 1A
Inheritance: AD, SD Classification: STRONG, MODERATE Submitted by: Genomics England PanelApp, Ambry Genetics
sick sinus syndrome 1
Inheritance: AR, AD Classification: STRONG, LIMITED Submitted by: Labcorp Genetics (formerly Invitae)
atrial standstill
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
familial atrial fibrillation
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
familial isolated dilated cardiomyopathy
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
familial sick sinus syndrome
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
paroxysmal familial ventricular fibrillation
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
progressive familial heart block
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
arrhythmogenic right ventricular cardiomyopathy
Inheritance: AD Classification: LIMITED Submitted by: ClinGen
catecholaminergic polymorphic ventricular tachycardia
Inheritance: AD Classification: NO_KNOWN Submitted by: ClinGen
congenital heart disease
Inheritance: AD Classification: NO_KNOWN Submitted by: ClinGen
short QT syndrome
Inheritance: AD Classification: NO_KNOWN Submitted by: ClinGen

SCN5A links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -13 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.025426924).

BP6

Variant 3-38554498-C-T is Benign according to our data. Variant chr3-38554498-C-T is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 67912.

BS1

Variant frequency is greater than expected in population sas. GnomAd4 allele frequency = 0.00025 (38/152218) while in subpopulation SAS AF = 0.00166 (8/4818). AF 95% confidence interval is 0.000826. There are 0 homozygotes in GnomAd4. There are 21 alleles in the male GnomAd4 subpopulation. Median coverage is 31. This position passed quality control check.

BS2

High Homozygotes in GnomAdExome4 at 3 AD,AR,SD gene

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_000335.5. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
SCN5A	NM_001099404.2	MANE Plus Clinical	c.4594G>A	p.Val1532Ile	missense	Exon 27 of 28	NP_001092874.1	H9KVD2
SCN5A	NM_000335.5	MANE Select	c.4591G>A	p.Val1531Ile	missense	Exon 27 of 28	NP_000326.2
SCN5A	NM_198056.3		c.4594G>A	p.Val1532Ile	missense	Exon 27 of 28	NP_932173.1	Q14524-1

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
SCN5A	ENST00000413689.6	TSL:5 MANE Plus Clinical	c.4594G>A	p.Val1532Ile	missense	Exon 27 of 28	ENSP00000410257.1	H9KVD2
SCN5A	ENST00000423572.7	TSL:1 MANE Select	c.4591G>A	p.Val1531Ile	missense	Exon 27 of 28	ENSP00000398266.2	Q14524-2
SCN5A	ENST00000333535.9	TSL:1	c.4594G>A	p.Val1532Ile	missense	Exon 27 of 28	ENSP00000328968.4	Q14524-1

Frequencies

GnomAD3 genomes

AF:

0.000250

AC:

AN:

152100

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000628

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.0000655

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.000385

Gnomad SAS

AF:

0.00166

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000147

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.000281

AC:

AN:

249164

AF XY:

0.000377

show subpopulations

Gnomad AFR exome

AF:

0.000775

Gnomad AMR exome

AF:

0.0000580

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.000111

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00000885

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.000133

AC:

194

AN:

1461558

Hom.:

Cov.:

AF XY:

0.000190

AC XY:

138

AN XY:

727028

show subpopulations

African (AFR)

AF:

0.000568

AC:

AN:

33476

American (AMR)

AF:

0.000134

AC:

AN:

44722

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26134

East Asian (EAS)

AF:

0.0000756

AC:

AN:

39696

South Asian (SAS)

AF:

0.00172

AC:

148

AN:

86254

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53400

Middle Eastern (MID)

AF:

0.000347

AC:

AN:

5768

European-Non Finnish (NFE)

AF:

0.00000720

AC:

AN:

1111740

Other (OTH)

AF:

0.000133

AC:

AN:

60368

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:

0.000250

AC:

AN:

152218

Hom.:

Cov.:

AF XY:

0.000282

AC XY:

AN XY:

74422

show subpopulations

African (AFR)

AF:

0.000626

AC:

AN:

41526

American (AMR)

AF:

0.0000654

AC:

AN:

15294

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3470

East Asian (EAS)

AF:

0.000386

AC:

AN:

5178

South Asian (SAS)

AF:

0.00166

AC:

AN:

4818

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10604

Middle Eastern (MID)

AF:

0.00

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.0000147

AC:

AN:

68012

Other (OTH)

AF:

0.00

AC:

AN:

2110

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

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:

0.000121

Hom.:

Bravo

AF:

0.000223

Asia WGS

AF:

0.00231

AC:

AN:

3478

ClinVar

ClinVar submissions

Significance:Conflicting classifications of pathogenicity

Revision:criteria provided, conflicting classifications

View on ClinVar

Pathogenic

VUS

Benign

Condition

not provided (2)

not specified (2)

Brugada syndrome 1 (1)

Cardiac arrhythmia (1)

Cardiovascular phenotype (1)

Long QT syndrome (1)

Congenital long QT syndrome (1)

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.076

CardioboostArm

Benign

0.00033

CardioboostCm

Benign

0.025

BayesDel_addAF

Benign

0.0030

BayesDel_noAF

Pathogenic

0.21

CADD

Benign

(source)

DANN

Uncertain

0.98

DEOGEN2

Uncertain

0.60

Eigen

Benign

-0.48

Eigen_PC

Benign

-0.28

FATHMM_MKL

Benign

0.71

LIST_S2

Uncertain

0.87

M_CAP

Pathogenic

0.56

MetaRNN

Benign

0.025

MetaSVM

Uncertain

0.16

MutationAssessor

Benign

-1.4

PhyloP100

2.6

PrimateAI

Uncertain

0.58

PROVEAN

Benign

0.36

REVEL

Uncertain

0.61

Sift

Benign

1.0

Sift4G

Benign

1.0

Varity_R

0.089

gMVP

0.82

Mutation Taster

=25/75

disease causing

(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

MaxEntScan Visualizer can be used to analyze the impact of this mutation on the neighboring sequence.

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