NM_000891.3:c.1229A>G

Variant names:

Variant summary

Our verdict is Benign. Variant got -12 ACMG points: 1P and 13B. PP2BP4_StrongBP6BS1BS2

The NM_000891.3(KCNJ2):c.1229A>G(p.Asn410Ser) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000276 in 1,614,168 control chromosomes in the GnomAD database, including 1 homozygotes. 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 Conflicting classifications of pathogenicity (no stars).

Frequency

Genomes: 𝑓 0.00037 ( 0 hom., cov: 32)

Exomes 𝑓: 0.00027 ( 1 hom. )

Consequence

KCNJ2
NM_000891.3 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:1B:8

Conservation

PhyloP100: 1.07

Variant links:

Genes affected

KCNJ2 (HGNC:6263): (potassium inwardly rectifying channel subfamily J member 2) Potassium channels are present in most mammalian cells, where they participate in a wide range of physiologic responses. The protein encoded by this gene is an integral membrane protein and inward-rectifier type potassium channel. The encoded protein, which has a greater tendency to allow potassium to flow into a cell rather than out of a cell, probably participates in establishing action potential waveform and excitability of neuronal and muscle tissues. Mutations in this gene have been associated with Andersen syndrome, which is characterized by periodic paralysis, cardiac arrhythmias, and dysmorphic features. [provided by RefSeq, Jul 2008]

KCNJ2 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Benign. Variant got -12 ACMG points.

PP2

Missense variant in the KCNJ2 gene, where missense mutations are typically associated with disease (based on misZ statistic). The gene has 51 curated pathogenic missense variants (we use a threshold of 10). The gene has 2 curated benign missense variants. Gene score misZ: 2.7459 (below the threshold of 3.09). Trascript score misZ: 3.9347 (above the threshold of 3.09). GenCC associations: The gene is linked to long QT syndrome, short QT syndrome, Andersen-Tawil syndrome, familial atrial fibrillation, short QT syndrome type 3, catecholaminergic polymorphic ventricular tachycardia.

BP4

Computational evidence support a benign effect (MetaRNN=0.015179396).

BP6

Variant 17-70176268-A-G is Benign according to our data. Variant chr17-70176268-A-G is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 190804.We mark this variant Likely_benign, oryginal submissions are: {Likely_benign=7, Benign=1, Uncertain_significance=1}.

BS1

Variant frequency is greater than expected in population afr. gnomad4 allele frequency = 0.000368 (56/152286) while in subpopulation AFR AF= 0.000674 (28/41558). AF 95% confidence interval is 0.000478. There are 0 homozygotes in gnomad4. There are 22 alleles in male gnomad4 subpopulation. Median coverage is 32. This position pass quality control queck.

BS2

High AC in GnomAd4 at 56 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
KCNJ2	NM_000891.3 link	c.1229A>G	p.Asn410Ser	missense_variant	Exon 2 of 2	ENST00000243457.4	NP_000882.1	P63252

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
KCNJ2	ENST00000243457.4 link	c.1229A>G	p.Asn410Ser	missense_variant	Exon 2 of 2	1	NM_000891.3	ENSP00000243457.2		P63252
KCNJ2	ENST00000535240.1 link	c.1229A>G	p.Asn410Ser	missense_variant	Exon 2 of 2	1		ENSP00000441848.1		P63252

Frequencies

GnomAD3 genomes

AF:

0.000375

AC:

AN:

152168

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000700

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000654

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:

0.000265

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.000342

AC:

AN:

251146

Hom.:

AF XY:

0.000309

AC XY:

AN XY:

135754

show subpopulations

Gnomad AFR exome

AF:

0.000678

Gnomad AMR exome

AF:

0.00101

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.0000462

Gnomad NFE exome

AF:

0.000308

Gnomad OTH exome

AF:

0.000652

GnomAD4 exome

AF:

0.000266

AC:

389

AN:

1461882

Hom.:

Cov.:

AF XY:

0.000228

AC XY:

166

AN XY:

727242

show subpopulations

Gnomad4 AFR exome

AF:

0.000508

Gnomad4 AMR exome

AF:

0.000760

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.0000374

Gnomad4 NFE exome

AF:

0.000273

Gnomad4 OTH exome

AF:

0.000464

GnomAD4 genome

AF:

0.000368

AC:

AN:

152286

Hom.:

Cov.:

AF XY:

0.000295

AC XY:

AN XY:

74462

show subpopulations

Gnomad4 AFR

AF:

0.000674

Gnomad4 AMR

AF:

0.000654

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.000265

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.000268

Hom.:

Bravo

AF:

0.000510

TwinsUK

AF:

0.000270

AC:

ALSPAC

AF:

0.00

AC:

ESP6500AA

AF:

0.000454

AC:

ESP6500EA

AF:

0.000233

AC:

ExAC

AF:

0.000371

AC:

EpiCase

AF:

0.000218

EpiControl

AF:

0.000533

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:1Benign:8

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not provided

Uncertain:1Benign:2

May 28, 2019

Mendelics

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Apr 30, 2020

GeneDx

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant is associated with the following publications: (PMID: 27930701, 28988457) -

May 26, 2017

ARUP Laboratories, Molecular Genetics and Genomics, ARUP Laboratories

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The p.Asn410Ser variant (rs141069645) has been previously reported once in a cohort of arrhythmogenic right ventricular cardiomyopathy (AVRC) patients (Sabater-Molina 2013); however, specific genetic and clinical information about the patient in question was not reported. This variant is listed in the Genome Aggregation Database (gnomAD) browser with an overall frequency of 0.034% (identified in 94 out of 276,876 chromosomes) and is listed the ClinVar database as likely benign or as a variant of uncertain significance (Variation ID: 190804). The asparagine at codon 410 is highly conserved considering 14 species up to frog (Alamut software v2.9), although several species of fish have a serine at this position, suggesting this change is evolutionary tolerated. Likewise, computational analyses suggest this variant does not have a significant effect on KCNJ2 protein structure/function (SIFT: tolerated, PolyPhen2: benign). However, based on the available information, the clinical significance of the p.Asn410Ser variant cannot be determined with certainty. -

not specified

Benign:1

Mar 12, 2020

Molecular Diagnostic Laboratory for Inherited Cardiovascular Disease, Montreal Heart Institute

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Andersen Tawil syndrome;C1865018:Short QT syndrome type 3

Benign:1

Jan 30, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Atrial fibrillation, familial, 9

Benign:1

Apr 28, 2017

Illumina Laboratory Services, Illumina

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant was observed as part of a predisposition screen in an ostensibly healthy population. A literature search was performed for the gene, cDNA change, and amino acid change (where applicable). No publications were found based on this search. Allele frequency data from public databases allowed determination this variant is unlikely to cause disease. Therefore, this variant is classified as likely benign. -

Andersen Tawil syndrome

Benign:1

Apr 28, 2017

Illumina Laboratory Services, Illumina

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Cardiovascular phenotype

Benign:1

Sep 19, 2018

Ambry Genetics

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This alteration is classified as likely benign based on a combination of the following: seen in unaffected individuals, population frequency, intact protein function, lack of segregation with disease, co-occurrence, RNA analysis, in silico models, amino acid conservation, lack of disease association in case-control studies, and/or the mechanism of disease or impacted region is inconsistent with a known cause of pathogenicity. -

Short QT syndrome type 3

Benign:1

Apr 28, 2017

Illumina Laboratory Services, Illumina

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.060

BayesDel_addAF

Benign

-0.46

BayesDel_noAF

Benign

-0.50

CADD

Benign

DANN

Benign

0.23

DEOGEN2

Benign

0.36

T;T

Eigen

Benign

-0.34

Eigen_PC

Benign

-0.10

FATHMM_MKL

Uncertain

0.86

LIST_S2

Benign

0.84

.;T

M_CAP

Uncertain

0.12

MetaRNN

Benign

0.015

T;T

MetaSVM

Benign

-0.64

MutationAssessor

Benign

0.0

N;N

PrimateAI

Uncertain

0.56

PROVEAN

Benign

-0.61

N;N

REVEL

Benign

0.25

Sift

Benign

0.81

T;T

Sift4G

Benign

0.80

T;T

Polyphen

0.0

B;B

Vest4

0.64

MVP

0.41

MPC

0.66

ClinPred

0.013

GERP RS

5.0

Varity_R

0.067

gMVP

0.12

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