NM_174934.4:c.617C>A

Variant names:

• chr11-118137097-G-T
• rs140348243
• NM_174934.4:c.617C>A

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 2P and 0B. PM2

The NM_174934.4(SCN4B):​c.617C>A​(p.Ser206*) variant causes a stop gained change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Synonymous variant affecting the same amino acid position (i.e. S206S) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 32)
• Consequence: SCN4B NM_174934.4 stop_gained
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 8.88
• Publications: 13 publications found

Genes affected

SCN4B (HGNC:10592): (sodium voltage-gated channel beta subunit 4) The protein encoded by this gene is one of several sodium channel beta subunits. These subunits interact with voltage-gated alpha subunits to change sodium channel kinetics. The encoded transmembrane protein forms interchain disulfide bonds with SCN2A. Defects in this gene are a cause of long QT syndrome type 10 (LQT10). Three protein-coding and one non-coding transcript variant have been found for this gene.[provided by RefSeq, Mar 2009]

SCN4B Gene-Disease associations (from GenCC):

• familial atrial fibrillation

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• long QT syndrome 10

  Inheritance: Unknown, AD Classification: LIMITED Submitted by: Laboratory for Molecular Medicine, Labcorp Genetics (formerly Invitae)
• long QT syndrome

  Inheritance: AD Classification: NO_KNOWN Submitted by: ClinGen

ACMG classification

Our verdict: Uncertain_significance. The variant received 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_174934.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	SCN4B	NM_174934.4	MANE Select	c.617C>A	p.Ser206*	stop_gained	Exon 5 of 5	NP_777594.1
	SCN4B	NM_001142349.2		c.287C>A	p.Ser96*	stop_gained	Exon 4 of 4	NP_001135821.1
	SCN4B	NM_001142348.2		c.215C>A	p.Ser72*	stop_gained	Exon 3 of 3	NP_001135820.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	SCN4B	ENST00000324727.9	TSL:1 MANE Select	c.617C>A	p.Ser206*	stop_gained	Exon 5 of 5	ENSP00000322460.4
	SCN4B	ENST00000415030.6	TSL:1	n.760C>A		non_coding_transcript_exon	Exon 4 of 4
	SCN4B	ENST00000531550.1	TSL:1	n.682C>A		non_coding_transcript_exon	Exon 2 of 2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

Alfa AF: 0.0000343 Hom.: 0

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.61	D
BayesDel_noAF	Pathogenic	0.63
CADD	Pathogenic	38
DANN	Uncertain	0.99
Eigen	Pathogenic	0.75
Eigen_PC	Uncertain	0.57
FATHMM_MKL	Pathogenic	0.98	D
PhyloP100		8.9
Vest4		0.81
GERP RS		4.5
Mutation Taster		=7/193	disease causing

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

Other links and lift over

dbSNP: rs140348243; hg19: chr11-118007812;