rs16839886

chr1-196407344-T-G

Variant summary

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

The NM_198503.5(KCNT2):c.1186-8673A>C variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0577 in 151,574 control chromosomes in the GnomAD database, including 392 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 0.058 (392 hom., cov: 32)
• Consequence: KCNT2 NM_198503.5 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 1.49

Genes affected

KCNT2 (HGNC:18866): (potassium sodium-activated channel subfamily T member 2) Enables chloride-activated potassium channel activity. Involved in potassium ion export across plasma membrane. Located in plasma membrane. Implicated in developmental and epileptic encephalopathy 57. [provided by Alliance of Genome Resources, Apr 2022]

ACMG classification

Verdict is Benign. Variant got -12 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.87).
• BA1: GnomAd4 highest subpopulation (NFE) allele frequency at 95% confidence interval = 0.0831 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
KCNT2	NM_198503.5	c.1186-8673A>C		intron_variant		ENST00000294725.14

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
KCNT2	ENST00000294725.14	c.1186-8673A>C		intron_variant		1	NM_198503.5	P4

Frequencies

GnomAD3 genomes AF: 0.0577 AC: 8741 AN: 151456 Hom.: 392 Cov.: 32

Gnomad AFR AF: 0.0137

Gnomad AMI AF: 0.00219

Gnomad AMR AF: 0.0411

Gnomad ASJ AF: 0.0243

Gnomad EAS AF: 0.0152

Gnomad SAS AF: 0.0134

Gnomad FIN AF: 0.138

Gnomad MID AF: 0.0316

Gnomad NFE AF: 0.0850

Gnomad OTH AF: 0.0487

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

GnomAD4 genome AF: 0.0577 AC: 8742 AN: 151574 Hom.: 392 Cov.: 32 AF XY: 0.0588 AC XY: 4353 AN XY: 74078

Gnomad4 AFR AF: 0.0137

Gnomad4 AMR AF: 0.0413

Gnomad4 ASJ AF: 0.0243

Gnomad4 EAS AF: 0.0152

Gnomad4 SAS AF: 0.0135

Gnomad4 FIN AF: 0.138

Gnomad4 NFE AF: 0.0850

Gnomad4 OTH AF: 0.0486

Alfa AF: 0.0714 Hom.: 434

Bravo AF: 0.0484

Asia WGS AF: 0.0160 AC: 57 AN: 3478

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.87
Cadd	Benign	4.1
Dann	Benign	0.63

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: rs16839886; hg19: chr1-196376474;