NM_001161352.2:c.34A>G

Variant names:

Variant summary

Our verdict is Benign. The variant received -20 ACMG points: 0P and 20B. BP4_StrongBP6_Very_StrongBS1BS2

The NM_001161352.2(KCNMA1):c.34A>G(p.Ser12Gly) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0022 in 1,520,716 control chromosomes in the GnomAD database, including 9 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 Likely benign (★★).

Frequency

Genomes: 𝑓 0.0057 ( 5 hom., cov: 32)

Exomes 𝑓: 0.0018 ( 4 hom. )

Consequence

KCNMA1
NM_001161352.2 missense

Scores

Clinical Significance

Benign/Likely benign criteria provided, multiple submitters, no conflicts U:1B:9

Conservation

PhyloP100: 0.101

Publications

6 publications found

Variant links:

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 Gene-Disease associations (from GenCC):

generalized epilepsy-paroxysmal dyskinesia syndrome
Inheritance: AD, AR Classification: DEFINITIVE, STRONG, MODERATE, SUPPORTIVE Submitted by: Illumina, G2P, Ambry Genetics, Orphanet, Labcorp Genetics (formerly Invitae), ClinGen
Liang-Wang syndrome
Inheritance: AD Classification: STRONG Submitted by: Ambry Genetics
cerebellar atrophy, developmental delay, and seizures
Inheritance: AR Classification: STRONG, MODERATE Submitted by: Ambry Genetics, G2P, Labcorp Genetics (formerly Invitae)

KCNMA1 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -20 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.0055193007).

BP6

Variant 10-77637609-T-C is Benign according to our data. Variant chr10-77637609-T-C is described in ClinVar as [Likely_benign]. Clinvar id is 193223.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

BS1

Variant frequency is greater than expected in population afr. GnomAd4 allele frequency = 0.0057 (851/149174) while in subpopulation AFR AF = 0.0147 (597/40538). AF 95% confidence interval is 0.0137. There are 5 homozygotes in GnomAd4. There are 393 alleles in the male GnomAd4 subpopulation. Median coverage is 32. This position passed quality control check.

BS2

High Homozygotes in GnomAd4 at 5 AR,AD gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
KCNMA1	NM_001161352.2 link	c.34A>G	p.Ser12Gly	missense_variant	Exon 1 of 28	ENST00000286628.14	NP_001154824.1	Q12791-1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
KCNMA1	ENST00000286628.14 link	c.34A>G	p.Ser12Gly	missense_variant	Exon 1 of 28	1	NM_001161352.2	ENSP00000286628.8		Q12791-1

Frequencies

GnomAD3 genomes

AF:

0.00570

AC:

850

AN:

149072

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0147

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00532

Gnomad ASJ

AF:

0.00146

Gnomad EAS

AF:

0.00242

Gnomad SAS

AF:

0.000866

Gnomad FIN

AF:

0.00116

Gnomad MID

AF:

0.00671

Gnomad NFE

AF:

0.00194

Gnomad OTH

AF:

0.00491

GnomAD2 exomes

AF:

0.00204

AC:

255

AN:

125036

AF XY:

0.00200

show subpopulations

Gnomad AFR exome

AF:

0.0106

Gnomad AMR exome

AF:

0.00322

Gnomad ASJ exome

AF:

0.00118

Gnomad EAS exome

AF:

0.00140

Gnomad FIN exome

AF:

0.00131

Gnomad NFE exome

AF:

0.00125

Gnomad OTH exome

AF:

0.00338

GnomAD4 exome

AF:

0.00182

AC:

2496

AN:

1371542

Hom.:

Cov.:

AF XY:

0.00178

AC XY:

1201

AN XY:

676296

show subpopulations

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR)

AF:

0.0130

AC:

399

AN:

30732

American (AMR)

AF:

0.00379

AC:

131

AN:

34548

Ashkenazi Jewish (ASJ)

AF:

0.00163

AC:

AN:

24556

East Asian (EAS)

AF:

0.00187

AC:

AN:

35206

South Asian (SAS)

AF:

0.000860

AC:

AN:

77920

European-Finnish (FIN)

AF:

0.00167

AC:

AN:

35334

Middle Eastern (MID)

AF:

0.00441

AC:

AN:

4992

European-Non Finnish (NFE)

AF:

0.00145

AC:

1550

AN:

1071072

Other (OTH)

AF:

0.00283

AC:

162

AN:

57182

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0.000000), which strongly suggests a high chance of mosaicism in these individuals.

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.360

Heterozygous variant carriers

107

214

322

429

536

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

AF:

0.00570

AC:

851

AN:

149174

Hom.:

Cov.:

AF XY:

0.00539

AC XY:

393

AN XY:

72928

show subpopulations

African (AFR)

AF:

0.0147

AC:

597

AN:

40538

American (AMR)

AF:

0.00531

AC:

AN:

15054

Ashkenazi Jewish (ASJ)

AF:

0.00146

AC:

AN:

3418

East Asian (EAS)

AF:

0.00243

AC:

AN:

4936

South Asian (SAS)

AF:

0.000867

AC:

AN:

4612

European-Finnish (FIN)

AF:

0.00116

AC:

AN:

10372

Middle Eastern (MID)

AF:

0.00725

AC:

AN:

276

European-Non Finnish (NFE)

AF:

0.00193

AC:

129

AN:

67010

Other (OTH)

AF:

0.00485

AC:

AN:

2060

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.446

Heterozygous variant carriers

129

172

215

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Alfa

AF:

0.00589

Hom.:

Bravo

AF:

0.00637

ExAC

AF:

0.000243

AC:

ClinVar

Significance: Benign/Likely benign

Submissions summary: Uncertain:1Benign:9

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not specified

Benign:3

Jun 06, 2019

Genetic Services Laboratory, University of Chicago

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Jul 05, 2024

Athena Diagnostics

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Feb 18, 2015

Eurofins Ntd Llc (ga)

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

not provided

Benign:3

Breakthrough Genomics, Breakthrough Genomics

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:not provided

- -

Aug 07, 2018

GeneDx

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This variant is associated with the following publications: (PMID: 19266219) -

May 01, 2025

CeGaT Center for Human Genetics Tuebingen

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

KCNMA1: BS1, BS2 -

Generalized epilepsy-paroxysmal dyskinesia syndrome

Benign:2

Feb 02, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Jan 13, 2018

Illumina Laboratory Services, Illumina

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score and internal cut-off values, a variant classified as likely benign is not then subjected to further curation. The score for this variant resulted in a classification of likely benign for this disease. -

Intellectual disability

Uncertain:1

Jan 01, 2019

Centre de Biologie Pathologie Génétique, Centre Hospitalier Universitaire de Lille

Significance:Uncertain significance

Review Status:no assertion criteria provided

Collection Method:clinical testing

- -

KCNMA1-related disorder

Benign:1

Nov 29, 2021

PreventionGenetics, part of Exact Sciences

Significance:Benign

Review Status:no assertion criteria provided

Collection Method:clinical testing

This variant is classified as benign based on ACMG/AMP sequence variant interpretation guidelines (Richards et al. 2015 PMID: 25741868, with internal and published modifications). -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.053

BayesDel_addAF

Uncertain

0.019

BayesDel_noAF

Benign

-0.21

CADD

Benign

(source)

DANN

Benign

0.76

DEOGEN2

Benign

0.0053

.;.;.;.;.;.;.;.;.;.;.;T;.;T;.;.;.;.;.;.;.;.;.;.;T;.;.;.;.;.;.;.;.;.;.;.;.

Eigen

Benign

-0.74

Eigen_PC

Benign

-0.65

FATHMM_MKL

Benign

0.12

LIST_S2

Benign

0.80

T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;.;T;T;T;T;T;T;T;T;T;T;T;T;T;T

MetaRNN

Benign

0.0055

T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T

MetaSVM

Benign

-0.89

MutationAssessor

Benign

0.0

.;.;.;.;.;.;.;.;.;.;.;.;.;.;.;.;.;.;.;.;.;.;N;N;N;.;N;.;.;N;N;N;.;.;N;.;.

PhyloP100

0.10

PrimateAI

Pathogenic

0.87

PROVEAN

Benign

0.050

.;.;.;.;.;N;.;.;.;.;.;.;.;N;.;.;.;.;.;.;.;.;.;N;.;.;.;.;.;.;.;.;.;.;.;.;.

REVEL

Benign

0.27

Sift

Pathogenic

0.0

.;.;.;.;.;D;.;.;.;.;.;.;.;D;.;.;.;.;.;.;.;.;.;D;.;.;.;.;.;.;.;.;.;.;.;.;.

Sift4G

Benign

0.49

.;.;.;.;.;T;.;.;.;.;.;T;.;T;.;.;.;.;.;.;.;.;.;T;T;.;.;.;.;T;.;.;.;.;T;T;T

Polyphen

0.0

.;.;.;.;.;B;.;.;.;.;.;.;.;.;.;.;.;.;.;.;.;B;.;B;B;.;.;B;.;B;.;.;.;.;B;.;.

Vest4

0.21, 0.23, 0.20, 0.17, 0.22, 0.21, 0.28, 0.20, 0.23

MVP

0.65

ClinPred

0.079

GERP RS

-1.6

PromoterAI

-0.0050

Neutral

(source)

Varity_R

0.066

gMVP

0.32

Mutation Taster

=98/2

polymorphism

(source)

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

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NM_001161352.2:c.34A>G

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over