Variant 3-179243205-T-C details in Genebe, Genetics Data Aggregator

Variant summary

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

The NM_171830.2(KCNMB3):c.527A>G(p.His176Arg) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00012 in 1,394,632 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 15/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: 𝑓 0.000040 ( 0 hom., cov: 30)

Exomes 𝑓: 0.00013 ( 0 hom. )

Consequence

KCNMB3
NM_171830.2 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 1.10

Variant links:

Genes affected

KCNMB3 (HGNC:6287): (potassium calcium-activated channel subfamily M regulatory beta subunit 3) 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 may partially inactivate or slightly decrease the activation time of MaxiK alpha subunit currents. Alternative splicing results in multiple transcript variants. A related pseudogene has been identified on chromosome 22. [provided by RefSeq, Jul 2009]

KCNMB3 links:

KCNMB3 (HGNC:):

KCNMB3 links:

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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=0.12838563).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
KCNMB3	NM_171830.2 linkuse as main transcript	c.527A>G	p.His176Arg	missense_variant	3/3	ENST00000392685.7	NP_741981.1	Q9NPA1-3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
KCNMB3	ENST00000392685.7 linkuse as main transcript	c.527A>G	p.His176Arg	missense_variant	3/3	1	NM_171830.2	ENSP00000376451.2		Q9NPA1-3

Frequencies

GnomAD3 genomes

AF:

0.0000398

AC:

AN:

150852

Hom.:

Cov.:

show subpopulations

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:

0.0000884

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000274

AC:

AN:

182590

Hom.:

AF XY:

0.0000407

AC XY:

AN XY:

98328

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:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000586

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.000129

AC:

161

AN:

1243780

Hom.:

Cov.:

AF XY:

0.000133

AC XY:

AN XY:

625512

show subpopulations

Gnomad4 AFR exome

AF:

0.0000359

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.000170

Gnomad4 OTH exome

AF:

0.0000380

GnomAD4 genome

AF:

0.0000398

AC:

AN:

150852

Hom.:

Cov.:

AF XY:

0.0000408

AC XY:

AN XY:

73552

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000884

Gnomad4 OTH

AF:

0.00

Bravo

AF:

0.0000416

ExAC

AF:

0.0000417

AC:

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

Oct 04, 2022

The c.527A>G (p.H176R) alteration is located in exon 3 (coding exon 3) of the KCNMB3 gene. This alteration results from a A to G substitution at nucleotide position 527, causing the histidine (H) at amino acid position 176 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

0.079

BayesDel_addAF

Benign

-0.36

BayesDel_noAF

Benign

-0.57

CADD

Benign

DANN

Benign

0.96

DEOGEN2

Benign

0.0017

.;.;.;T;.

Eigen

Benign

-0.35

Eigen_PC

Benign

-0.19

FATHMM_MKL

Benign

0.68

LIST_S2

Benign

0.60

.;T;T;T;T

M_CAP

Benign

0.0032

MetaRNN

Benign

0.13

T;T;T;T;T

MetaSVM

Benign

-0.99

MutationAssessor

Benign

1.9

.;.;.;M;.

PrimateAI

Benign

0.42

PROVEAN

Benign

-1.8

N;.;N;N;N

REVEL

Benign

0.065

Sift

Benign

0.38

T;.;T;T;T

Sift4G

Uncertain

0.032

.;D;T;T;T

Polyphen

0.0010

B;.;B;B;B

Vest4

0.096

MVP

0.25

MPC

1.5

ClinPred

0.062

GERP RS

4.1

Varity_R

0.072

gMVP

0.41

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