Variant 5-114362711-C-T 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_021614.4(KCNN2):c.572C>T(p.Pro191Leu) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000387 in 1,498,672 control chromosomes in the GnomAD database, including 1 homozygotes. In-silico tool predicts a benign outcome for this variant. 7/8 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: 𝑓 0.000086 ( 0 hom., cov: 33)

Exomes 𝑓: 0.000033 ( 1 hom. )

Consequence

KCNN2
NM_021614.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: -0.316

Variant links:

Genes affected

KCNN2 (HGNC:6291): (potassium calcium-activated channel subfamily N member 2) Action potentials in vertebrate neurons are followed by an afterhyperpolarization (AHP) that may persist for several seconds and may have profound consequences for the firing pattern of the neuron. Each component of the AHP is kinetically distinct and is mediated by different calcium-activated potassium channels. The protein encoded by this gene is activated before membrane hyperpolarization and is thought to regulate neuronal excitability by contributing to the slow component of synaptic AHP. This gene is a member of the KCNN family of potassium channel genes. The encoded protein is an integral membrane protein that forms a voltage-independent calcium-activated channel with three other calmodulin-binding subunits. Alternate splicing of this gene results in multiple transcript variants. [provided by RefSeq, May 2013]

KCNN2 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -6 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.12744877).

BS2

High AC in GnomAd4 at 13 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
KCNN2	NM_021614.4 linkuse as main transcript	c.572C>T	p.Pro191Leu	missense_variant	1/8	ENST00000673685.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris
KCNN2	ENST00000673685.1 linkuse as main transcript	c.572C>T	p.Pro191Leu	missense_variant	1/8		NM_021614.4	P2
KCNN2	ENST00000512097.10 linkuse as main transcript	c.770C>T	p.Pro257Leu	missense_variant	6/13	5		A2
KCNN2	ENST00000631899.2 linkuse as main transcript			upstream_gene_variant		5

Frequencies

GnomAD3 genomes

AF:

0.0000855

AC:

AN:

152044

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000266

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.0000654

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:

0.000478

GnomAD4 exome

AF:

0.0000334

AC:

AN:

1346628

Hom.:

Cov.:

AF XY:

0.0000303

AC XY:

AN XY:

660248

show subpopulations

Gnomad4 AFR exome

AF:

0.000362

Gnomad4 AMR exome

AF:

0.000172

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.0000266

Gnomad4 SAS exome

AF:

0.000230

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00000939

Gnomad4 OTH exome

AF:

0.0000358

GnomAD4 genome

AF:

0.0000855

AC:

AN:

152044

Hom.:

Cov.:

AF XY:

0.0000808

AC XY:

AN XY:

74292

show subpopulations

Gnomad4 AFR

AF:

0.000266

Gnomad4 AMR

AF:

0.0000654

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:

0.000478

Alfa

AF:

0.000214

Hom.:

Bravo

AF:

0.000162

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

Neurodevelopmental disorder with or without variable movement or behavioral abnormalities

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Neuberg Centre For Genomic Medicine, NCGM

May 20, 2023

The missense c.572C>T (p.Pro191Leu) variant in the KCNN2 gene has not been reported previously as a pathogenic variant nor as a benign variant, to our knowledge. . This variant is reported with the allele frequency (0.006%) in the gnomAD Exomes. The amino acid Proline at position 191 is changed to a Leucine changing protein sequence and it might alter its composition and physico-chemical properties. Computational evidence (Polyphen -Benign, SIFT - Tolerated and MutationTaster - Disease causing) predicts conflicting evidence on protein structure and function for this variant. The amino acid change p.Pro191Leu in KCNN2 is predicted as conserved by GERP++. For these reasons, this variant has been classified as Uncertain Significance. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.37

CADD

Benign

DANN

Benign

0.97

FATHMM_MKL

Benign

0.69

LIST_S2

Benign

0.54

MetaRNN

Benign

0.13

MutationTaster

Benign

1.0

D;D

GERP RS

1.1

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