NM_001099404.2:c.1345A>G

Variant names:

Variant summary

Our verdict is Likely benign. The variant received -5 ACMG points: 0P and 5B. BP4_StrongBP6

The NM_001099404.2(SCN5A):c.1345A>G(p.Thr449Ala) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000434 in 1,611,214 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 18/24 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Synonymous variant affecting the same amino acid position (i.e. T449T) has been classified as Likely benign.

Frequency

Genomes: 𝑓 0.000020 ( 0 hom., cov: 32)

Exomes 𝑓: 0.0000027 ( 0 hom. )

Consequence

SCN5A
NM_001099404.2 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:3B:1O:1

Conservation

PhyloP100: 0.389

Publications

3 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: Likely_benign. The variant received -5 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.032494873).

BP6

Variant 3-38604902-T-C is Benign according to our data. Variant chr3-38604902-T-C is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 67658.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001099404.2. 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.1345A>G	p.Thr449Ala	missense	Exon 11 of 28	NP_001092874.1	H9KVD2
SCN5A	NM_000335.5	MANE Select	c.1345A>G	p.Thr449Ala	missense	Exon 11 of 28	NP_000326.2
SCN5A	NM_198056.3		c.1345A>G	p.Thr449Ala	missense	Exon 11 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.1345A>G	p.Thr449Ala	missense	Exon 11 of 28	ENSP00000410257.1	H9KVD2
SCN5A	ENST00000423572.7	TSL:1 MANE Select	c.1345A>G	p.Thr449Ala	missense	Exon 11 of 28	ENSP00000398266.2	Q14524-2
SCN5A	ENST00000333535.9	TSL:1	c.1345A>G	p.Thr449Ala	missense	Exon 11 of 28	ENSP00000328968.4	Q14524-1

Frequencies

GnomAD3 genomes

AF:

0.0000197

AC:

AN:

152158

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.000386

Gnomad SAS

AF:

0.000207

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.00000823

AC:

AN:

243070

AF XY:

0.00000759

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.000113

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000274

AC:

AN:

1458938

Hom.:

Cov.:

AF XY:

0.00000276

AC XY:

AN XY:

725404

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33438

American (AMR)

AF:

0.00

AC:

AN:

44322

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26066

East Asian (EAS)

AF:

0.00

AC:

AN:

39644

South Asian (SAS)

AF:

0.0000234

AC:

AN:

85482

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53270

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5760

European-Non Finnish (NFE)

AF:

9.00e-7

AC:

AN:

1110672

Other (OTH)

AF:

0.0000166

AC:

AN:

60284

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.500

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:

0.0000197

AC:

AN:

152276

Hom.:

Cov.:

AF XY:

0.0000269

AC XY:

AN XY:

74446

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

41542

American (AMR)

AF:

0.00

AC:

AN:

15298

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3472

East Asian (EAS)

AF:

0.000386

AC:

AN:

5176

South Asian (SAS)

AF:

0.000207

AC:

AN:

4826

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10622

Middle Eastern (MID)

AF:

0.00

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

68020

Other (OTH)

AF:

0.00

AC:

AN:

2114

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.525

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:

0.00

Hom.:

Bravo

AF:

0.00000378

ExAC

AF:

0.0000165

AC:

Asia WGS

AF:

0.000577

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 (3)

Brugada syndrome (1)

Cardiac arrhythmia (1)

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.064

CardioboostArm

Benign

0.000014

CardioboostCm

Benign

0.0042

BayesDel_addAF

Benign

-0.23

BayesDel_noAF

Benign

-0.34

CADD

Benign

(source)

DANN

Benign

0.22

DEOGEN2

Benign

0.34

Eigen

Benign

-1.1

Eigen_PC

Benign

-0.93

FATHMM_MKL

Benign

0.56

LIST_S2

Benign

0.42

M_CAP

Uncertain

0.28

MetaRNN

Benign

0.032

MetaSVM

Benign

-0.44

MutationAssessor

Benign

-1.2

PhyloP100

0.39

PrimateAI

Benign

0.44

PROVEAN

Benign

0.84

REVEL

Benign

0.26

Sift

Benign

0.65

Sift4G

Benign

1.0

Polyphen

0.0

Vest4

0.15

MutPred

0.30

Loss of phosphorylation at T449 (P = 0.0445)

MVP

0.39

MPC

0.34

ClinPred

0.014

GERP RS

-3.5

Varity_R

0.042

gMVP

0.47

Mutation Taster

=69/31

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