19-35033954-C-G

Variant names:

• chr19-35033954-C-G
• rs1015574605
• ENST00000415950.5:c.663C>G

Variant summary

Our verdict is Benign. The variant received -17 ACMG points: 0P and 17B. BP4_Strong BP6_Very_Strong BP7 BS1

The NM_199037.5(SCN1B):​c.663C>G​(p.Val221Val) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000837 in 1,553,224 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★). Synonymous variant affecting the same amino acid position (i.e. V221V) has been classified as Likely benign.

• Frequency:
  • Genomes: 𝑓 0.0000066 (0 hom., cov: 32)
  • Exomes 𝑓: 0.0000086 (0 hom.)
• Consequence: SCN1B NM_199037.5 synonymous
• Clinical Significance: Likely benign criteria provided, multiple submitters, no conflicts B:2
• Conservation: PhyloP100: 0.0330
• Publications: 0 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: Benign. The variant received -17 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.87).
• BP6: Variant 19-35033954-C-G is Benign according to our data. Variant chr19-35033954-C-G is described in ClinVar as Likely_benign. ClinVar VariationId is 470183.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
• BP7: Synonymous conserved (PhyloP=0.033 with no splicing effect.
• BS1: Variant frequency is greater than expected in population mid. GnomAdExome4 allele frequency = 0.00000857 (12/1400976) while in subpopulation MID AF = 0.000527 (3/5698). AF 95% confidence interval is 0.000143. There are 0 homozygotes in GnomAdExome4. There are 4 alleles in the male GnomAdExome4 subpopulation. Median coverage is 33. This position passed quality control check.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_199037.5. 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
	SCN1B	NM_001037.5	MANE Select	c.448+215C>G		intron	N/A	NP_001028.1
	SCN1B	NM_199037.5		c.663C>G	p.Val221Val	synonymous	Exon 3 of 3	NP_950238.1
	SCN1B	NM_001321605.2		c.349+215C>G		intron	N/A	NP_001308534.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	SCN1B	ENST00000415950.5	TSL:1	c.663C>G	p.Val221Val	synonymous	Exon 3 of 3	ENSP00000396915.2
	SCN1B	ENST00000262631.11	TSL:1 MANE Select	c.448+215C>G		intron	N/A	ENSP00000262631.3
	SCN1B	ENST00000638536.1	TSL:1	c.448+215C>G		intron	N/A	ENSP00000492022.1

Frequencies

GnomAD3 genomes AF: 0.00000657 AC: 1 AN: 152248 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.0000147

Gnomad OTH AF: 0.00

GnomAD2 exomes AF: 0.00000637 AC: 1 AN: 157042 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: 0.000228

GnomAD4 exome AF: 0.00000857 AC: 12 AN: 1400976 Hom.: 0 Cov.: 33 AF XY: 0.00000579 AC XY: 4 AN XY: 691322

African (AFR) AF: 0.00 AC: 0 AN: 31636

American (AMR) AF: 0.00 AC: 0 AN: 35784

Ashkenazi Jewish (ASJ) AF: 0.0000397 AC: 1 AN: 25190

East Asian (EAS) AF: 0.00 AC: 0 AN: 35776

South Asian (SAS) AF: 0.0000251 AC: 2 AN: 79752

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 49394

Middle Eastern (MID) AF: 0.000527 AC: 3 AN: 5698

European-Non Finnish (NFE) AF: 0.00000370 AC: 4 AN: 1079652

Other (OTH) AF: 0.0000344 AC: 2 AN: 58094

GnomAD4 genome AF: 0.00000657 AC: 1 AN: 152248 Hom.: 0 Cov.: 32 AF XY: 0.00 AC XY: 0 AN XY: 74378

African (AFR) AF: 0.00 AC: 0 AN: 41458

American (AMR) AF: 0.00 AC: 0 AN: 15288

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3472

East Asian (EAS) AF: 0.00 AC: 0 AN: 5198

South Asian (SAS) AF: 0.00 AC: 0 AN: 4834

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10626

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 316

European-Non Finnish (NFE) AF: 0.0000147 AC: 1 AN: 68052

Other (OTH) AF: 0.00 AC: 0 AN: 2092

Alfa AF: 0.0000868 Hom.: 0

Bravo AF: 0.0000113

ClinVar

ClinVar submissions as Germline

Significance: Likely benign

Revision: criteria provided, multiple submitters, no conflicts

Pathogenic	VUS	Benign	Condition
-	-	1	Brugada syndrome 5 (1)
-	-	1	not provided (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.87
CADD	Benign	3.2
DANN	Benign	0.61
PhyloP100		0.033
Mutation Taster		=100/0	polymorphism

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.040		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: rs1015574605; hg19: chr19-35524858;