rs2917454

Positions:

• chr10-77132657-T-C
• chr10-77132657-T-G

Variant summary

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

The NM_001161352.2(KCNMA1):​c.809-11609A>G variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.153 in 151,892 control chromosomes in the GnomAD database, including 3,765 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 0.15 (3765 hom., cov: 31)
• Consequence: KCNMA1 NM_001161352.2 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.138

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=-0.91).
• BA1: GnomAd4 highest subpopulation (EAS) allele frequency at 95% confidence interval = 0.848 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
KCNMA1	NM_001161352.2	c.809-11609A>G		intron_variant		ENST00000286628.14	NP_001154824.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
KCNMA1	ENST00000286628.14	c.809-11609A>G		intron_variant		1	NM_001161352.2	ENSP00000286628	A2

Frequencies

GnomAD3 genomes AF: 0.153 AC: 23173 AN: 151778 Hom.: 3750 Cov.: 31

Gnomad AFR AF: 0.202

Gnomad AMI AF: 0.0969

Gnomad AMR AF: 0.232

Gnomad ASJ AF: 0.0392

Gnomad EAS AF: 0.870

Gnomad SAS AF: 0.338

Gnomad FIN AF: 0.0997

Gnomad MID AF: 0.0737

Gnomad NFE AF: 0.0532

Gnomad OTH AF: 0.132

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

GnomAD4 genome AF: 0.153 AC: 23206 AN: 151892 Hom.: 3765 Cov.: 31 AF XY: 0.163 AC XY: 12078 AN XY: 74210

Gnomad4 AFR AF: 0.202

Gnomad4 AMR AF: 0.233

Gnomad4 ASJ AF: 0.0392

Gnomad4 EAS AF: 0.870

Gnomad4 SAS AF: 0.337

Gnomad4 FIN AF: 0.0997

Gnomad4 NFE AF: 0.0532

Gnomad4 OTH AF: 0.142

Alfa AF: 0.0822 Hom.: 2748

Bravo AF: 0.165

Asia WGS AF: 0.548 AC: 1905 AN: 3478

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.91
CADD	Benign	2.1
DANN	Benign	0.33

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: rs2917454; hg19: chr10-78892415;