19-35030794-G-C

Position:

• chr19-35030794-G-C

Variant summary

Our verdict is Benign. Variant got -18 ACMG points: 0P and 18B. BP4_Moderate BP6_Very_Strong BS1 BS2

The NM_001037.5(SCN1B):​c.-27G>C variant causes a 5 prime UTR change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000116 in 1,011,510 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 Benign (★★).

• Frequency:
  • Genomes: 𝑓 0.00017 (0 hom., cov: 31)
  • Exomes 𝑓: 0.00011 (0 hom.)
• Consequence: SCN1B NM_001037.5 5_prime_UTR
• Clinical Significance: Benign criteria provided, multiple submitters, no conflicts B:3
• Conservation: PhyloP100: 2.43

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]

ACMG classification

Verdict is Benign. Variant got -18 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.45).
• BP6: Variant 19-35030794-G-C is Benign according to our data. Variant chr19-35030794-G-C is described in ClinVar as [Benign]. Clinvar id is 328833.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
• BS1: Variant frequency is greater than expected in population eas. gnomad4 allele frequency = 0.000167 (25/149514) while in subpopulation EAS AF= 0.00351 (18/5130). AF 95% confidence interval is 0.00227. There are 0 homozygotes in gnomad4. There are 14 alleles in male gnomad4 subpopulation. Median coverage is 31. This position pass quality control queck.
• BS2: High AC in GnomAd4 at 25 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
SCN1B	NM_001037.5	c.-27G>C		5_prime_UTR_variant	1/6	ENST00000262631.11	NP_001028.1
SCN1B	NM_199037.5	c.-27G>C		5_prime_UTR_variant	1/3		NP_950238.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
SCN1B	ENST00000262631.11	c.-27G>C		5_prime_UTR_variant	1/6	1	NM_001037.5	ENSP00000262631	P1
SCN1B	ENST00000415950.5	c.-27G>C		5_prime_UTR_variant	1/3	1		ENSP00000396915
SCN1B	ENST00000638536.1	c.-27G>C		5_prime_UTR_variant	1/5	1		ENSP00000492022	P1
SCN1B	ENST00000595652.5	c.-27G>C		5_prime_UTR_variant	1/6	2		ENSP00000468848

Frequencies

GnomAD3 genomes AF: 0.000167 AC: 25 AN: 149406 Hom.: 0 Cov.: 31

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.0000663

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00350

Gnomad SAS AF: 0.000414

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.0000598

Gnomad OTH AF: 0.00

GnomAD3 exomes AF: 0.000310 AC: 9 AN: 29010 Hom.: 0 AF XY: 0.000349 AC XY: 6 AN XY: 17178

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00402

Gnomad SAS exome AF: 0.000957

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.000107 AC: 92 AN: 861996 Hom.: 0 Cov.: 12 AF XY: 0.000121 AC XY: 52 AN XY: 428718

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.000102

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00299

Gnomad4 SAS exome AF: 0.000784

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000839

Gnomad4 OTH exome AF: 0.000409

GnomAD4 genome AF: 0.000167 AC: 25 AN: 149514 Hom.: 0 Cov.: 31 AF XY: 0.000192 AC XY: 14 AN XY: 72950

Gnomad4 AFR AF: 0.00

Gnomad4 AMR AF: 0.0000662

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00351

Gnomad4 SAS AF: 0.000414

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.0000598

Gnomad4 OTH AF: 0.00

Bravo AF: 0.000298

Asia WGS AF: 0.00255 AC: 9 AN: 3150

ClinVar

Significance: Benign

Submissions summary: Benign:3

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Brugada syndrome 5 Benign:1

Benign, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jan 13, 2018

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score and internal cut-off values, a variant classified as benign is not then subjected to further curation. The score for this variant resulted in a classification of benign for this disease. -

not provided Benign:1

Benign, criteria provided, single submitter

clinical testing

GeneDx

Mar 03, 2015

- -

Generalized epilepsy with febrile seizures plus, type 1 Benign:1

Benign, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jan 13, 2018

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score and internal cut-off values, a variant classified as benign is not then subjected to further curation. The score for this variant resulted in a classification of benign for this disease. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.45
CADD	Benign	17
DANN	Benign	0.88

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

LitVar

Other links and lift over

dbSNP: rs758958222; hg19: chr19-35521698;