3-178842674-G-A

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2BP4_Moderate

The NM_181361.3(KCNMB2):c.445G>A(p.Gly149Arg) variant causes a missense change. The variant allele was found at a frequency of 0.0000151 in 1,459,240 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 13/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 0.000015 ( 0 hom. )

Consequence

KCNMB2
NM_181361.3 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 5.59

Variant links:

Genes affected

KCNMB2 (HGNC:6286): (potassium calcium-activated channel subfamily M regulatory beta subunit 2) MaxiK channels are large conductance, voltage and calcium-sensitive potassium channels which are fundamental to the control of smooth muscle tone and neuronal excitability. MaxiK channels can be formed by 2 subunits: the pore-forming alpha subunit and the modulatory beta subunit. The protein encoded by this gene is an auxiliary beta subunit which decreases the activation time of MaxiK alpha subunit currents. Alternative splicing results in multiple transcript variants of this gene. Additional variants are discussed in the literature, but their full length nature has not been described. [provided by RefSeq, Jul 2013]

KCNMB2 links:

KCNMB2-AS1 (HGNC:51409): (KCNMB2 antisense RNA 1)

KCNMB2-AS1 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 0 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.09727275).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
KCNMB2	NM_181361.3 linkuse as main transcript	c.445G>A	p.Gly149Arg	missense_variant	5/5	ENST00000452583.6
KCNMB2-AS1	NR_126560.1 linkuse as main transcript	n.247+16815C>T		intron_variant, non_coding_transcript_variant

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
KCNMB2	ENST00000452583.6 linkuse as main transcript	c.445G>A	p.Gly149Arg	missense_variant	5/5	1	NM_181361.3	P1
KCNMB2-AS1	ENST00000437488.5 linkuse as main transcript	n.194+16815C>T		intron_variant, non_coding_transcript_variant		1

Frequencies

GnomAD3 genomes

Cov.:

GnomAD3 exomes

AF:

0.0000160

AC:

AN:

250168

Hom.:

AF XY:

0.00000739

AC XY:

AN XY:

135260

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.0000290

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000266

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000151

AC:

AN:

1459240

Hom.:

Cov.:

AF XY:

0.0000138

AC XY:

AN XY:

726048

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.0000224

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.0000116

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000162

Gnomad4 OTH exome

AF:

0.0000332

GnomAD4 genome

Cov.:

Alfa

AF:

0.0000764

Hom.:

Bravo

AF:

0.0000113

EpiCase

AF:

0.0000545

EpiControl

AF:

0.00

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

Mar 01, 2023

The c.445G>A (p.G149R) alteration is located in exon 5 (coding exon 4) of the KCNMB2 gene. This alteration results from a G to A substitution at nucleotide position 445, causing the glycine (G) at amino acid position 149 to be replaced by an arginine (R). 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

AlphaMissense

Benign

0.25

BayesDel_addAF

Benign

-0.19

BayesDel_noAF

Benign

-0.43

Cadd

Benign

Dann

Benign

0.82

DEOGEN2

Benign

0.024

T;T;T;T;.;.

Eigen

Benign

-0.20

Eigen_PC

Benign

0.097

FATHMM_MKL

Uncertain

0.96

M_CAP

Benign

0.0098

MetaRNN

Benign

0.097

T;T;T;T;T;T

MetaSVM

Benign

-0.83

MutationAssessor

Benign

-0.34

N;N;N;N;.;.

MutationTaster

Benign

1.0

D;D;D;D

PrimateAI

Uncertain

0.62

PROVEAN

Benign

1.7

N;N;N;N;.;.

REVEL

Benign

0.19

Sift

Benign

0.87

T;T;T;T;.;.

Sift4G

Benign

0.64

T;T;T;T;T;T

Polyphen

0.049

B;B;B;B;.;.

Vest4

0.15

MutPred

0.31

Loss of ubiquitination at K150 (P = 0.0587);Loss of ubiquitination at K150 (P = 0.0587);Loss of ubiquitination at K150 (P = 0.0587);Loss of ubiquitination at K150 (P = 0.0587);.;Loss of ubiquitination at K150 (P = 0.0587);

MVP

0.068

MPC

1.0

ClinPred

0.28

GERP RS

5.9

Varity_R

0.14

gMVP

0.76

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.020

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