Variant 1-6051573-G-A details in Genebe, Genetics Data Aggregator

Variant summary

Our verdict is Likely benign. Variant got -6 ACMG points: 0P and 6B. BP4_ModerateBS2

The NM_001199862.2(KCNAB2):c.37G>A(p.Val13Met) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000104 in 1,534,044 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 Uncertain significance (★).

Frequency

Genomes: 𝑓 0.00011 ( 0 hom., cov: 33)

Exomes 𝑓: 0.00010 ( 0 hom. )

Consequence

KCNAB2
NM_001199862.2 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 9.16

Variant links:

Genes affected

KCNAB2 (HGNC:6229): (potassium voltage-gated channel subfamily A regulatory beta subunit 2) 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, shaker-related subfamily. This member is one of the beta subunits, which are auxiliary proteins associating with functional Kv-alpha subunits. This member alters functional properties of the KCNA4 gene product. Alternative splicing of this gene results in multiple transcript variants encoding distinct isoforms. [provided by RefSeq, Dec 2010]

KCNAB2 links:

KCNAB2 (HGNC:):

KCNAB2 links:

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ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -6 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.23701018).

BS2

High AC in GnomAd4 at 17 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
KCNAB2	NM_001199862.2 linkuse as main transcript	c.37G>A	p.Val13Met	missense_variant	2/16	ENST00000378083.8	NP_001186791.1	Q13303-3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
KCNAB2	ENST00000378083.8 linkuse as main transcript	c.37G>A	p.Val13Met	missense_variant	2/16	2	NM_001199862.2	ENSP00000367323.3		Q13303-3

Frequencies

GnomAD3 genomes

AF:

0.000112

AC:

AN:

152260

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000723

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000262

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:

0.000103

Gnomad OTH

AF:

0.00143

GnomAD3 exomes

AF:

0.0000450

AC:

AN:

133420

Hom.:

AF XY:

0.0000138

AC XY:

AN XY:

72602

show subpopulations

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 SAS exome

AF:

0.0000446

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000961

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.000103

AC:

142

AN:

1381666

Hom.:

Cov.:

AF XY:

0.000112

AC XY:

AN XY:

681478

show subpopulations

Gnomad4 AFR exome

AF:

0.0000634

Gnomad4 AMR exome

AF:

0.0000281

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.0000841

Gnomad4 SAS exome

AF:

0.000152

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.000109

Gnomad4 OTH exome

AF:

0.000121

GnomAD4 genome

AF:

0.000112

AC:

AN:

152378

Hom.:

Cov.:

AF XY:

0.000107

AC XY:

AN XY:

74510

show subpopulations

Gnomad4 AFR

AF:

0.0000721

Gnomad4 AMR

AF:

0.000261

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.000103

Gnomad4 OTH

AF:

0.00142

Alfa

AF:

0.0000727

Hom.:

Bravo

AF:

0.000144

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Feb 28, 2024

The c.37G>A (p.V13M) alteration is located in exon 2 (coding exon 1) of the KCNAB2 gene. This alteration results from a G to A substitution at nucleotide position 37, causing the valine (V) at amino acid position 13 to be replaced by a methionine (M). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_addAF

Benign

-0.25

BayesDel_noAF

Benign

-0.41

CADD

Uncertain

DANN

Uncertain

1.0

Eigen

Uncertain

0.55

Eigen_PC

Uncertain

0.62

FATHMM_MKL

Uncertain

0.91

LIST_S2

Benign

0.81

M_CAP

Uncertain

0.18

MetaRNN

Benign

0.24

MetaSVM

Benign

-1.1

PrimateAI

Uncertain

0.78

PROVEAN

Benign

-0.040

REVEL

Benign

0.17

Sift

Benign

0.043

Sift4G

Benign

0.12

Polyphen

0.95

Vest4

0.42

MutPred

0.17

Gain of helix (P = 0.062);

MVP

0.39

MPC

1.6

ClinPred

0.68

GERP RS

5.3

gMVP

0.34

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.010

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