NM_004975.4:c.198C>T

Variant names:

Variant summary

Our verdict is Benign. Variant got -21 ACMG points: 0P and 21B. BP4_StrongBP6_Very_StrongBP7BA1

The NM_004975.4(KCNB1):c.198C>T(p.His66His) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00488 in 1,612,228 control chromosomes in the GnomAD database, including 289 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Benign (★★).

Frequency

Genomes: 𝑓 0.025 ( 164 hom., cov: 32)

Exomes 𝑓: 0.0028 ( 125 hom. )

Consequence

KCNB1
NM_004975.4 synonymous

Scores

Clinical Significance

Benign criteria provided, multiple submitters, no conflicts B:3

Conservation

PhyloP100: 0.346

Variant links:

Genes affected

KCNB1 (HGNC:6231): (potassium voltage-gated channel subfamily B member 1) Voltage-gated potassium (Kv) channels represent the most complex class of voltage-gated ion channels from both functional and structural standpoints. Their diverse functions include regulating neurotransmitter release, heart rate, insulin secretion, neuronal excitability, epithelial electrolyte transport, smooth muscle contraction, and cell volume. Four sequence-related potassium channel genes - shaker, shaw, shab, and shal - have been identified in Drosophila, and each has been shown to have human homolog(s). This gene encodes a member of the potassium channel, voltage-gated, shab-related subfamily. This member is a delayed rectifier potassium channel and its activity is modulated by some other family members. [provided by RefSeq, Jul 2008]

KCNB1 links:

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ACMG classification

Classification made for transcript

Verdict is Benign. Variant got -21 ACMG points.

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.57).

BP6

Variant 20-49482283-G-A is Benign according to our data. Variant chr20-49482283-G-A is described in ClinVar as [Benign]. Clinvar id is 380821.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

BP7

Synonymous conserved (PhyloP=0.346 with no splicing effect.

BA1

GnomAd4 highest subpopulation (AFR) allele frequency at 95% confidence interval = 0.0834 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
KCNB1	NM_004975.4 link	c.198C>T	p.His66His	synonymous_variant	Exon 1 of 2	ENST00000371741.6	NP_004966.1	Q14721
KCNB1	XM_011528799.3 link	c.198C>T	p.His66His	synonymous_variant	Exon 2 of 3		XP_011527101.1	Q14721

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
KCNB1	ENST00000371741.6 link	c.198C>T	p.His66His	synonymous_variant	Exon 1 of 2	1	NM_004975.4	ENSP00000360806.3		Q14721
KCNB1	ENST00000635465.1 link	c.198C>T	p.His66His	synonymous_variant	Exon 2 of 3	1		ENSP00000489193.1		Q14721

Frequencies

GnomAD3 genomes

AF:

0.0248

AC:

3774

AN:

152232

Hom.:

164

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0860

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00870

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.000207

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00633

Gnomad NFE

AF:

0.000794

Gnomad OTH

AF:

0.00955

GnomAD3 exomes

AF:

0.00675

AC:

1668

AN:

246960

Hom.:

AF XY:

0.00517

AC XY:

694

AN XY:

134320

show subpopulations

Gnomad AFR exome

AF:

0.0880

Gnomad AMR exome

AF:

0.00524

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.000656

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.000540

Gnomad OTH exome

AF:

0.00566

GnomAD4 exome

AF:

0.00280

AC:

4085

AN:

1459878

Hom.:

125

Cov.:

AF XY:

0.00246

AC XY:

1787

AN XY:

726030

show subpopulations

Gnomad4 AFR exome

AF:

0.0847

Gnomad4 AMR exome

AF:

0.00576

Gnomad4 ASJ exome

AF:

0.0000383

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.000731

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.000450

Gnomad4 OTH exome

AF:

0.00640

GnomAD4 genome

AF:

0.0248

AC:

3776

AN:

152350

Hom.:

164

Cov.:

AF XY:

0.0237

AC XY:

1767

AN XY:

74504

show subpopulations

Gnomad4 AFR

AF:

0.0858

Gnomad4 AMR

AF:

0.00868

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.000207

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.000794

Gnomad4 OTH

AF:

0.00945

Alfa

AF:

0.0122

Hom.:

Bravo

AF:

0.0281

Asia WGS

AF:

0.00346

AC:

AN:

3478

EpiCase

AF:

0.000872

EpiControl

AF:

0.000712

ClinVar

Significance: Benign

Submissions summary: Benign:3

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Developmental and epileptic encephalopathy, 26

Benign:1

Feb 03, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

not specified

Benign:1

Jan 20, 2016

GeneDx

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant is considered likely benign or benign based on one or more of the following criteria: it is a conservative change, it occurs at a poorly conserved position in the protein, it is predicted to be benign by multiple in silico algorithms, and/or has population frequency not consistent with disease. -

not provided

Benign:1

Breakthrough Genomics, Breakthrough Genomics

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: not provided

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.57

CADD

Benign

DANN

Benign

0.80

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over