chr1-154756918-C-T

Position:

• chr1-154756918-C-T

Variant summary

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

The NM_002249.6(KCNN3):​c.1448+15057G>A variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.361 in 151,976 control chromosomes in the GnomAD database, including 10,598 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 0.36 (10598 hom., cov: 31)
• Consequence: KCNN3 NM_002249.6 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.127

Genes affected

KCNN3 (HGNC:6292): (potassium calcium-activated channel subfamily N member 3) Action potentials in vertebrate neurons are followed by an afterhyperpolarization (AHP) that may persist for several seconds and may have profound consequences for the firing pattern of the neuron. Each component of the AHP is kinetically distinct and is mediated by different calcium-activated potassium channels. This gene belongs to the KCNN family of potassium channels. It encodes an integral membrane protein that forms a voltage-independent calcium-activated channel, which is thought to regulate neuronal excitability by contributing to the slow component of synaptic AHP. This gene contains two CAG repeat regions in the coding sequence. It was thought that expansion of one or both of these repeats could lead to an increased susceptibility to schizophrenia or bipolar disorder, but studies indicate that this is probably not the case. Alternatively spliced transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Feb 2011]

ACMG classification

Verdict is Benign. Variant got -12 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-1.0).
• BA1: GnomAd4 highest subpopulation (NFE) allele frequency at 95% confidence interval = 0.438 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
KCNN3	NM_002249.6	c.1448+15057G>A		intron_variant		ENST00000271915.9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
KCNN3	ENST00000271915.9	c.1448+15057G>A		intron_variant		1	NM_002249.6	P1
KCNN3	ENST00000358505.2	c.509+15057G>A		intron_variant		1
KCNN3	ENST00000361147.8	c.533+15057G>A		intron_variant		1
KCNN3	ENST00000618040.4	c.1448+15057G>A		intron_variant		5

Frequencies

GnomAD3 genomes AF: 0.361 AC: 54805 AN: 151858 Hom.: 10594 Cov.: 31

Gnomad AFR AF: 0.242

Gnomad AMI AF: 0.531

Gnomad AMR AF: 0.338

Gnomad ASJ AF: 0.308

Gnomad EAS AF: 0.200

Gnomad SAS AF: 0.351

Gnomad FIN AF: 0.417

Gnomad MID AF: 0.367

Gnomad NFE AF: 0.442

Gnomad OTH AF: 0.378

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

GnomAD4 genome AF: 0.361 AC: 54839 AN: 151976 Hom.: 10598 Cov.: 31 AF XY: 0.357 AC XY: 26550 AN XY: 74268

Gnomad4 AFR AF: 0.242

Gnomad4 AMR AF: 0.337

Gnomad4 ASJ AF: 0.308

Gnomad4 EAS AF: 0.199

Gnomad4 SAS AF: 0.353

Gnomad4 FIN AF: 0.417

Gnomad4 NFE AF: 0.442

Gnomad4 OTH AF: 0.384

Alfa AF: 0.422 Hom.: 19470

Bravo AF: 0.350

Asia WGS AF: 0.294 AC: 1026 AN: 3478

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-1.0
CADD	Benign	1.7
DANN	Benign	0.36

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.020		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: rs10908435; hg19: chr1-154729394;