10-76949303-C-A

Variant names:

• chr10-76949303-C-A
• rs142770262
• NM_001161352.2:c.2548G>T
• KCNMA1 p.Val850Phe

Variant summary

Our verdict is Uncertain significance. The variant received 1 ACMG points: 2P and 1B. PM2 BP4

The NM_001161352.2(KCNMA1):​c.2548G>T​(p.Val850Phe) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. V850I) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 32)
• Consequence: KCNMA1 NM_001161352.2 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 5.02
• Publications: 4 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)

LOC124902466 (HGNC:):

ACMG classification

Our verdict: Uncertain_significance. The variant received 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.37441996).

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

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	KCNMA1	NM_001161352.2	MANE Select	c.2548G>T	p.Val850Phe	missense	Exon 22 of 28	NP_001154824.1	Q12791-1
	KCNMA1	NM_001437422.1		c.2506G>T	p.Val836Phe	missense	Exon 22 of 28	NP_001424351.1
	KCNMA1	NM_001161353.2		c.2497G>T	p.Val833Phe	missense	Exon 22 of 28	NP_001154825.1	Q12791-2

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	KCNMA1	ENST00000286628.14	TSL:1 MANE Select	c.2548G>T	p.Val850Phe	missense	Exon 22 of 28	ENSP00000286628.8	Q12791-1
	KCNMA1	ENST00000626620.3	TSL:1	c.2497G>T	p.Val833Phe	missense	Exon 22 of 28	ENSP00000485867.1	Q12791-2
	KCNMA1	ENST00000639406.1	TSL:1	c.2383G>T	p.Val795Phe	missense	Exon 22 of 29	ENSP00000491732.1	B7ZMF5

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

Alfa AF: 0.00 Hom.: 0

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.26
BayesDel_addAF	Pathogenic	0.19	D
BayesDel_noAF	Uncertain	0.030
CADD	Uncertain	24
DANN	Uncertain	0.99
DEOGEN2	Benign	0.070	T
Eigen	Benign	0.066
Eigen_PC	Uncertain	0.27
FATHMM_MKL	Pathogenic	0.97	D
LIST_S2	Pathogenic	0.98	D
M_CAP	Benign	0.0089	T
MetaRNN	Benign	0.37	T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	0.34	N
PhyloP100		5.0
PrimateAI	Pathogenic	0.81	D
PROVEAN	Benign	-2.3	N
REVEL	Benign	0.17
Sift	Uncertain	0.023	D
Sift4G	Uncertain	0.036	D
Varity_R		0.74
gMVP		0.79
Mutation Taster		=40/60	disease causing

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

MaxEntScan Visualizer can be used to analyze the impact of this mutation on the neighboring sequence.

Other links and lift over

dbSNP: rs142770262;

hg19: chr10-78709061;