rs886039469

Variant names:

• chr10-76891709-T-C
• rs886039469
• NM_001161352.2:c.3158A>G

Variant summary

Our verdict is Pathogenic. The variant received 11 ACMG points: 11P and 0B. PM2 PP3 PP5_Very_Strong

The NM_001161352.2(KCNMA1):​c.3158A>G​(p.Asn1053Ser) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Pathogenic (★★).

• Frequency: Genomes: not found (cov: 33)
• Consequence: KCNMA1 NM_001161352.2 missense
• Clinical Significance: Pathogenic criteria provided, multiple submitters, no conflicts P:7
• Conservation: PhyloP100: 7.67
• Publications: 32 publications found

Genes affected

KCNMA1 (HGNC:6284): (potassium calcium-activated channel subfamily M alpha 1) This gene encodes the alpha subunit of calcium-activated BK channel. The encoded protein is involved in several physiological processes including smooth muscle contraction, neurotransmitter release and neuronal excitability. Mutations in this gene are associated with a spectrum of neurological disorders including Paroxysmal Nonkinesigenic Dyskinesia 3, Idiopathic Generalized Epilepsy 16 and Liang-Wang syndrome. [provided by RefSeq, Aug 2022]

KCNMA1-AS1 (HGNC:51213): (KCNMA1 antisense RNA 1)

ACMG classification

Our verdict: Pathogenic. The variant received 11 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.804
• PP5: Variant 10-76891709-T-C is Pathogenic according to our data. Variant chr10-76891709-T-C is described in ClinVar as Pathogenic. ClinVar VariationId is 265313.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001161352.2. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	KCNMA1	NM_001161352.2	MANE Select	c.3158A>G	p.Asn1053Ser	missense	Exon 26 of 28	NP_001154824.1
	KCNMA1	NM_001437422.1		c.3116A>G	p.Asn1039Ser	missense	Exon 26 of 28	NP_001424351.1
	KCNMA1	NM_001161353.2		c.3107A>G	p.Asn1036Ser	missense	Exon 26 of 28	NP_001154825.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	KCNMA1	ENST00000286628.14	TSL:1 MANE Select	c.3158A>G	p.Asn1053Ser	missense	Exon 26 of 28	ENSP00000286628.8
	KCNMA1	ENST00000626620.3	TSL:1	c.3107A>G	p.Asn1036Ser	missense	Exon 26 of 28	ENSP00000485867.1
	KCNMA1	ENST00000639406.1	TSL:1	c.3074A>G	p.Asn1025Ser	missense	Exon 27 of 29	ENSP00000491732.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 33

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:7

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Generalized epilepsy-paroxysmal dyskinesia syndrome Pathogenic:5

Aug 30, 2017

OMIM

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: literature only

Oct 05, 2018

Undiagnosed Diseases Network, NIH

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Jul 15, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces asparagine, which is neutral and polar, with serine, which is neutral and polar, at codon 995 of the KCNMA1 protein (p.Asn995Ser). This variant is not present in population databases (gnomAD no frequency). This missense change has been observed in individual(s) with autosomal dominant epilepsy and/or paroxysomal dyskinesia (PMID: 26195193, 29330545; Invitae). In at least one individual the variant was observed to be de novo. This variant is also known as c.3158A>G (p.Asn1053Ser). ClinVar contains an entry for this variant (Variation ID: 265313). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) has been performed at Invitae for this missense variant, however the output from this modeling did not meet the statistical confidence thresholds required to predict the impact of this variant on KCNMA1 protein function. Experimental studies have shown that this missense change affects KCNMA1 function (PMID: 29330545). For these reasons, this variant has been classified as Pathogenic.

May 13, 2021

Pediatric Genetics Clinic, Sheba Medical Center

Significance: Likely pathogenic

Review Status: no assertion criteria provided

Collection Method: clinical testing

Sep 08, 2002

Center of Excellence for Medical Genomics, Chulalongkorn University

Significance: Likely pathogenic

Review Status: no assertion criteria provided

Collection Method: research

not provided Pathogenic:2

Apr 01, 2025

CeGaT Center for Human Genetics Tuebingen

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

KCNMA1: PS2, PS4, PM2, PP2, PP3, PS3:Supporting

Jan 03, 2023

GeneDx

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Published functional studies demonstrate that N995S results in a gain-of-function with markedly increased macroscopic potassium current (Li et al., 2018; Moldenhauer et al., 2020); In silico analysis supports that this missense variant has a deleterious effect on protein structure/function; Not observed at significant frequency in large population cohorts (gnomAD); Also known as N1053S using alternate nomenclature; This variant is associated with the following publications: (PMID: 32132200, 32655623, 26195193, 29330545, 30525188, 31152168, 31851553, 32633875, 33043086, 33767182)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.69
BayesDel_addAF	Uncertain	0.097	D
BayesDel_noAF	Benign	-0.10
CADD	Pathogenic	26
DANN	Uncertain	1.0
DEOGEN2	Benign	0.19	T
Eigen	Pathogenic	0.77
Eigen_PC	Pathogenic	0.75
FATHMM_MKL	Pathogenic	0.98	D
LIST_S2	Pathogenic	1.0	D
M_CAP	Pathogenic	0.48	D
MetaRNN	Pathogenic	0.80	D
MetaSVM	Uncertain	0.78	D
MutationAssessor	Benign	1.8	L
PhyloP100		7.7
PrimateAI	Pathogenic	0.83	D
PROVEAN	Uncertain	-4.4	D
REVEL	Pathogenic	0.71
Sift	Uncertain	0.0080	D
Sift4G	Pathogenic	0.0	D
Polyphen		1.0	D
Vest4		0.86
MutPred		0.35		Loss of stability (P = 0.1039)
MVP		0.84
MPC		2.1
ClinPred		0.99	D
GERP RS		5.5
Varity_R		0.68
gMVP		0.99
Mutation Taster		=1/99	disease causing (ClinVar)

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

Other links and lift over

dbSNP: rs886039469; hg19: chr10-78651467;