NM_001037.5:c.363C>A

Variant names:

• chr19-35033654-C-A
• rs104894718
• NM_001037.5:c.363C>A

Variant summary

Our verdict is Pathogenic. The variant received 10 ACMG points: 10P and 0B. PVS1 PM2

The NM_001037.5(SCN1B):​c.363C>A​(p.Cys121*) variant causes a stop gained change involving the alteration of a non-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. Variant results in nonsense mediated mRNA decay.

• Frequency: Genomes: not found (cov: 32)
• Consequence: SCN1B NM_001037.5 stop_gained
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 1.99
• Publications: 52 publications found

Genes affected

SCN1B (HGNC:10586): (sodium voltage-gated channel beta subunit 1) Voltage-gated sodium channels are heteromeric proteins that function in the generation and propagation of action potentials in muscle and neuronal cells. They are composed of one alpha and two beta subunits, where the alpha subunit provides channel activity and the beta-1 subunit modulates the kinetics of channel inactivation. This gene encodes a sodium channel beta-1 subunit. Mutations in this gene result in generalized epilepsy with febrile seizures plus, Brugada syndrome 5, and defects in cardiac conduction. Multiple transcript variants encoding different isoforms have been found for this gene.[provided by RefSeq, Oct 2009]

HPN-AS1 (HGNC:47041): (HPN antisense RNA 1)

ACMG classification

Our verdict: Pathogenic. The variant received 10 ACMG points.

• PVS1: Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
• PM2: Very rare variant in population databases, with high coverage

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001037.5. 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
	SCN1B	NM_001037.5	MANE Select	c.363C>A	p.Cys121*	stop_gained	Exon 3 of 6	NP_001028.1	Q07699-1
	SCN1B	NM_199037.5		c.363C>A	p.Cys121*	stop_gained	Exon 3 of 3	NP_950238.1	Q07699-2
	SCN1B	NM_001321605.2		c.264C>A	p.Cys88*	stop_gained	Exon 3 of 6	NP_001308534.1	A0A1W2PR05

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	SCN1B	ENST00000262631.11	TSL:1 MANE Select	c.363C>A	p.Cys121*	stop_gained	Exon 3 of 6	ENSP00000262631.3	Q07699-1
	SCN1B	ENST00000415950.5	TSL:1	c.363C>A	p.Cys121*	stop_gained	Exon 3 of 3	ENSP00000396915.2	Q07699-2
	SCN1B	ENST00000638536.1	TSL:1	c.363C>A	p.Cys121*	stop_gained	Exon 3 of 5	ENSP00000492022.1	Q07699-1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 33

GnomAD4 genome Cov.: 32

Alfa AF: 0.00 Hom.: 0

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.60	D
BayesDel_noAF	Pathogenic	0.59
CADD	Pathogenic	38
DANN	Uncertain	0.99
Eigen	Uncertain	0.59
Eigen_PC	Uncertain	0.42
FATHMM_MKL	Uncertain	0.94	D
PhyloP100		2.0
Vest4		0.90
GERP RS		3.2
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Mutation Taster		=17/183	disease causing (fs/PTC)

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: rs104894718; hg19: chr19-35524558;