3-178842696-T-C

Variant names:

Variant summary

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

The NM_181361.3(KCNMB2):c.467T>C(p.Met156Thr) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000744 in 1,613,060 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: 𝑓 0.000013 ( 0 hom., cov: 32)

Exomes 𝑓: 0.0000068 ( 0 hom. )

Consequence

KCNMB2
NM_181361.3 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 2.23

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:

ENSG00000275163 (HGNC:):

ENSG00000275163 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=0.075885445).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
KCNMB2	NM_181361.3 link	c.467T>C	p.Met156Thr	missense_variant	Exon 5 of 5	ENST00000452583.6	NP_852006.1	Q9Y691B5BNW5

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
KCNMB2	ENST00000452583.6 link	c.467T>C	p.Met156Thr	missense_variant	Exon 5 of 5	1	NM_181361.3	ENSP00000397483.1		Q9Y691
ENSG00000275163	ENST00000614557.1 link	c.467T>C	p.Met156Thr	missense_variant	Exon 5 of 5	2		ENSP00000483415.1

Frequencies

GnomAD3 genomes

AF:

0.0000131

AC:

AN:

152194

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000483

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:

0.00

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000279

AC:

AN:

250824

Hom.:

AF XY:

0.0000295

AC XY:

AN XY:

135570

show subpopulations

Gnomad AFR exome

AF:

0.000123

Gnomad AMR exome

AF:

0.000145

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:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000685

AC:

AN:

1460866

Hom.:

Cov.:

AF XY:

0.00000826

AC XY:

AN XY:

726828

show subpopulations

Gnomad4 AFR exome

AF:

0.000120

Gnomad4 AMR exome

AF:

0.000112

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:

9.00e-7

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

AF:

0.0000131

AC:

AN:

152194

Hom.:

Cov.:

AF XY:

0.0000134

AC XY:

AN XY:

74352

show subpopulations

Gnomad4 AFR

AF:

0.0000483

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:

0.00

Gnomad4 OTH

AF:

0.00

Bravo

AF:

0.00000756

ExAC

AF:

0.0000165

AC:

Asia WGS

AF:

0.000289

AC:

AN:

3478

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Jun 10, 2024

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.467T>C (p.M156T) alteration is located in exon 5 (coding exon 4) of the KCNMB2 gene. This alteration results from a T to C substitution at nucleotide position 467, causing the methionine (M) at amino acid position 156 to be replaced by a threonine (T). 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

0.13

BayesDel_addAF

Benign

-0.41

BayesDel_noAF

Benign

-0.59

CADD

Benign

DANN

Benign

0.88

DEOGEN2

Benign

0.033

T;T;T;T;.;.

Eigen

Benign

-0.25

Eigen_PC

Benign

0.014

FATHMM_MKL

Uncertain

0.88

LIST_S2

Benign

0.84

.;.;.;.;T;T

M_CAP

Benign

0.0038

MetaRNN

Benign

0.076

T;T;T;T;T;T

MetaSVM

Benign

-0.93

MutationAssessor

Benign

0.0

N;N;N;N;.;.

PrimateAI

Uncertain

0.56

PROVEAN

Benign

-0.84

N;N;N;N;.;.

REVEL

Benign

0.067

Sift

Benign

0.23

T;T;T;T;.;.

Sift4G

Benign

0.58

T;T;T;T;T;T

Polyphen

0.0010

B;B;B;B;.;.

Vest4

0.14

MutPred

0.59

Gain of catalytic residue at M156 (P = 0.0317);Gain of catalytic residue at M156 (P = 0.0317);Gain of catalytic residue at M156 (P = 0.0317);Gain of catalytic residue at M156 (P = 0.0317);.;Gain of catalytic residue at M156 (P = 0.0317);

MVP

0.068

MPC

0.38

ClinPred

0.043

GERP RS

6.1

Varity_R

0.18

gMVP

0.61

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