10-77441784-C-T

Variant summary

Our verdict is Benign. Variant got -12 ACMG points: 0P and 12B. BP4_Strong BA1

The NM_001161352.2(KCNMA1):c.379-37761G>A variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.249 in 151,952 control chromosomes in the GnomAD database, including 6,368 homozygotes. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency: Genomes: 𝑓 0.25 (6368 hom., cov: 32)
• Consequence: KCNMA1 NM_001161352.2 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.00600

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]

ACMG classification

Verdict is Benign. Variant got -12 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.57).
• BA1: GnomAd4 highest subpopulation (AFR) allele frequency at 95% confidence interval = 0.473 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
KCNMA1	NM_001161352.2	c.379-37761G>A		intron_variant		ENST00000286628.14

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
KCNMA1	ENST00000286628.14	c.379-37761G>A		intron_variant		1	NM_001161352.2	A2

Frequencies

GnomAD3 genomes AF: 0.249 AC: 37760 AN: 151834 Hom.: 6323 Cov.: 32

Gnomad AFR AF: 0.477

Gnomad AMI AF: 0.149

Gnomad AMR AF: 0.175

Gnomad ASJ AF: 0.155

Gnomad EAS AF: 0.292

Gnomad SAS AF: 0.238

Gnomad FIN AF: 0.0889

Gnomad MID AF: 0.203

Gnomad NFE AF: 0.156

Gnomad OTH AF: 0.230

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

GnomAD4 genome AF: 0.249 AC: 37859 AN: 151952 Hom.: 6368 Cov.: 32 AF XY: 0.245 AC XY: 18170 AN XY: 74286

Gnomad4 AFR AF: 0.478

Gnomad4 AMR AF: 0.175

Gnomad4 ASJ AF: 0.155

Gnomad4 EAS AF: 0.291

Gnomad4 SAS AF: 0.236

Gnomad4 FIN AF: 0.0889

Gnomad4 NFE AF: 0.156

Gnomad4 OTH AF: 0.232

Alfa AF: 0.0940 Hom.: 162

Bravo AF: 0.267

Asia WGS AF: 0.266 AC: 925 AN: 3478

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.57
Cadd	Benign	14
Dann	Benign	0.86

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

Other links and lift over

dbSNP: rs10762760; hg19: chr10-79201542;