1-154714922-C-T

Position:

chr1-154714922-C-T

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 3P and 1B. PM2PP2BP4

The NM_002249.6(KCNN3):c.1783G>A(p.Ala595Thr) variant causes a missense change. The variant allele was found at a frequency of 0.0000031 in 1,613,606 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: 𝑓 0.0000066 ( 0 hom., cov: 30)

Exomes 𝑓: 0.0000027 ( 0 hom. )

Consequence

KCNN3
NM_002249.6 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 3.64

Variant links:

Genes affected

KCNN3 (HGNC:6292): (potassium calcium-activated channel subfamily N member 3) 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. This gene belongs to the KCNN family of potassium channels. It encodes an integral membrane protein that forms a voltage-independent calcium-activated channel, which is thought to regulate neuronal excitability by contributing to the slow component of synaptic AHP. This gene contains two CAG repeat regions in the coding sequence. It was thought that expansion of one or both of these repeats could lead to an increased susceptibility to schizophrenia or bipolar disorder, but studies indicate that this is probably not the case. Alternatively spliced transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Feb 2011]

KCNN3 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 2 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

PP2

Missense variant in gene, where missense usually causes diseases (based on misZ statistic), KCNN3. . Gene score misZ 3.3258 (greater than the threshold 3.09). Trascript score misZ 4.6043 (greater than threshold 3.09). GenCC has associacion of gene with Zimmermann-Laband syndrome, schizophrenia, zimmermann-laband syndrome 3.

BP4

Computational evidence support a benign effect (MetaRNN=0.27128306).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
KCNN3	NM_002249.6 linkuse as main transcript	c.1783G>A	p.Ala595Thr	missense_variant	6/8	ENST00000271915.9	NP_002240.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
KCNN3	ENST00000271915.9 linkuse as main transcript	c.1783G>A	p.Ala595Thr	missense_variant	6/8	1	NM_002249.6	ENSP00000271915	P1	Q9UGI6-1
KCNN3	ENST00000361147.8 linkuse as main transcript	c.868G>A	p.Ala290Thr	missense_variant	6/8	1		ENSP00000354764		Q9UGI6-2
KCNN3	ENST00000358505.2 linkuse as main transcript	c.844G>A	p.Ala282Thr	missense_variant	6/8	1		ENSP00000351295		Q9UGI6-3
KCNN3	ENST00000618040.4 linkuse as main transcript	c.1828G>A	p.Ala610Thr	missense_variant	7/9	5		ENSP00000481848

Frequencies

GnomAD3 genomes

AF:

0.00000658

AC:

AN:

152064

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.0000655

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:

0.00000398

AC:

AN:

251334

Hom.:

AF XY:

0.00

AC XY:

AN XY:

135826

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.0000289

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:

0.00000274

AC:

AN:

1461542

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

727076

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:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00000270

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

AF:

0.00000658

AC:

AN:

152064

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

74260

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.0000655

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

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

Inborn genetic diseases

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Sep 06, 2022

The c.1783G>A (p.A595T) alteration is located in exon 6 (coding exon 6) of the KCNN3 gene. This alteration results from a G to A substitution at nucleotide position 1783, causing the alanine (A) at amino acid position 595 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

0.21

BayesDel_addAF

Uncertain

0.099

BayesDel_noAF

Uncertain

-0.010

CADD

Uncertain

DANN

Uncertain

1.0

DEOGEN2

Benign

0.28

.;T;.;.

Eigen

Benign

0.13

Eigen_PC

Uncertain

0.29

FATHMM_MKL

Uncertain

0.95

LIST_S2

Uncertain

0.95

D;D;D;D

M_CAP

Uncertain

0.11

MetaRNN

Benign

0.27

T;T;T;T

MetaSVM

Pathogenic

0.93

MutationTaster

Benign

0.88

D;D;D

PrimateAI

Pathogenic

0.83

PROVEAN

Benign

-2.0

N;.;N;N

REVEL

Uncertain

0.46

Sift

Benign

0.060

T;.;T;T

Sift4G

Benign

0.12

T;T;T;T

Polyphen

0.0040

.;.;B;.

Vest4

0.38

MVP

0.77

MPC

1.0

ClinPred

0.47

GERP RS

5.4

Varity_R

0.14

gMVP

0.54

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