3-38605954-G-C

Variant names:

• chr3-38605954-G-C
• rs368045716
• NM_001099404.2:c.1335C>G

Variant summary

Our verdict is Likely benign. The variant received -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The NM_000335.5(SCN5A):​c.1335C>G​(p.His445Gln) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000689 in 1,450,490 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 15/24 in silico tools predict a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another nucleotide change resulting in the same amino acid substitution has been previously reported as Uncertain significance in ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. H445D) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 6.9e-7 (0 hom.)
• Consequence: SCN5A NM_000335.5 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.529
• Publications: 0 publications found

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: ClinGen, Orphanet
• Brugada syndrome 1

  Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: Laboratory for Molecular Medicine, Genomics England PanelApp, Labcorp Genetics (formerly Invitae), 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: Ambry Genetics, G2P, Labcorp Genetics (formerly Invitae)
• 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), Ambry Genetics, G2P
• 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

ACMG classification

Our verdict: Likely_benign. The variant received -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.025270015).

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

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	SCN5A	NM_001099404.2	MANE Plus Clinical	c.1335C>G	p.His445Gln	missense	Exon 10 of 28	NP_001092874.1	H9KVD2
	SCN5A	NM_000335.5	MANE Select	c.1335C>G	p.His445Gln	missense	Exon 10 of 28	NP_000326.2
	SCN5A	NM_198056.3		c.1335C>G	p.His445Gln	missense	Exon 10 of 28	NP_932173.1	Q14524-1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	SCN5A	ENST00000413689.6	TSL:5 MANE Plus Clinical	c.1335C>G	p.His445Gln	missense	Exon 10 of 28	ENSP00000410257.1	H9KVD2
	SCN5A	ENST00000423572.7	TSL:1 MANE Select	c.1335C>G	p.His445Gln	missense	Exon 10 of 28	ENSP00000398266.2	Q14524-2
	SCN5A	ENST00000333535.9	TSL:1	c.1335C>G	p.His445Gln	missense	Exon 10 of 28	ENSP00000328968.4	Q14524-1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD2 exomes AF: 0.00000413 AC: 1 AN: 242382 AF XY: 0.00

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 6.89e-7 AC: 1 AN: 1450490 Hom.: 0 Cov.: 31 AF XY: 0.00 AC XY: 0 AN XY: 720130

African (AFR) AF: 0.00 AC: 0 AN: 33138

American (AMR) AF: 0.00 AC: 0 AN: 44030

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 25480

East Asian (EAS) AF: 0.00 AC: 0 AN: 39556

South Asian (SAS) AF: 0.0000118 AC: 1 AN: 84628

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53046

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5714

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1104982

Other (OTH) AF: 0.00 AC: 0 AN: 59916

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.15
CardioboostArm	Benign	0.0000027
CardioboostCm	Benign	0.020
BayesDel_addAF	Benign	-0.081	T
BayesDel_noAF	Benign	-0.25
CADD	Benign	0.42
DANN	Benign	0.67
DEOGEN2	Benign	0.34	T
Eigen	Benign	-1.9
Eigen_PC	Benign	-1.8
FATHMM_MKL	Benign	0.045	N
LIST_S2	Benign	0.70	T
M_CAP	Pathogenic	0.29	D
MetaRNN	Benign	0.025	T
MetaSVM	Benign	-0.39	T
MutationAssessor	Benign	-1.7	N
PhyloP100		-0.53
PrimateAI	Uncertain	0.53	T
PROVEAN	Benign	2.7	N
REVEL	Uncertain	0.33
Sift	Benign	1.0	T
Sift4G	Benign	1.0	T
Polyphen		0.0	B
Vest4		0.24
MutPred		0.30		Gain of helix (P = 0.0854)
MVP		0.49
MPC		0.36
ClinPred		0.037	T
GERP RS		-11
Varity_R		0.050
gMVP		0.44
Mutation Taster		=42/58	disease causing

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.060		Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Other links and lift over

dbSNP: rs368045716; hg19: chr3-38647445;