1-154841792-G-C

Variant names:

• chr1-154841792-G-C
• rs6666258
• NM_002249.6:c.934-19608C>G

Variant summary

Our verdict is Benign. The variant received -12 ACMG points: 0P and 12B. BP4_Strong BA1

The NM_002249.6(KCNN3):​c.934-19608C>G variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.298 in 152,154 control chromosomes in the GnomAD database, including 7,161 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 0.30 (7161 hom., cov: 32)
• Consequence: KCNN3 NM_002249.6 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.556
• Publications: 52 publications found

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]

KCNN3 Gene-Disease associations (from GenCC):

• Zimmermann-Laband syndrome 3

  Inheritance: AD Classification: STRONG, MODERATE Submitted by: Labcorp Genetics (formerly Invitae), G2P, Ambry Genetics
• Zimmermann-Laband syndrome

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
• schizophrenia

  Inheritance: Unknown Classification: LIMITED Submitted by: Labcorp Genetics (formerly Invitae)

ACMG classification

Our verdict: Benign. The variant received -12 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.95).
• BA1: GnomAd4 highest subpopulation (AFR) allele frequency at 95% confidence interval = 0.364 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
KCNN3	NM_002249.6	c.934-19608C>G		intron_variant	Intron 1 of 7	ENST00000271915.9	NP_002240.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
KCNN3	ENST00000271915.9	c.934-19608C>G		intron_variant	Intron 1 of 7	1	NM_002249.6	ENSP00000271915.3
KCNN3	ENST00000361147.8	c.18+17903C>G		intron_variant	Intron 1 of 7	1		ENSP00000354764.4
KCNN3	ENST00000358505.2	c.-6-19608C>G		intron_variant	Intron 1 of 7	1		ENSP00000351295.2
KCNN3	ENST00000618040.4	c.934-19608C>G		intron_variant	Intron 1 of 8	5		ENSP00000481848.1

Frequencies

GnomAD3 genomes AF: 0.298 AC: 45266 AN: 152034 Hom.: 7145 Cov.: 32

Gnomad AFR AF: 0.369

Gnomad AMI AF: 0.288

Gnomad AMR AF: 0.209

Gnomad ASJ AF: 0.222

Gnomad EAS AF: 0.0341

Gnomad SAS AF: 0.205

Gnomad FIN AF: 0.280

Gnomad MID AF: 0.222

Gnomad NFE AF: 0.309

Gnomad OTH AF: 0.279

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

GnomAD4 genome AF: 0.298 AC: 45329 AN: 152154 Hom.: 7161 Cov.: 32 AF XY: 0.293 AC XY: 21761 AN XY: 74372

African (AFR) AF: 0.369 AC: 15298 AN: 41482

American (AMR) AF: 0.208 AC: 3187 AN: 15290

Ashkenazi Jewish (ASJ) AF: 0.222 AC: 770 AN: 3472

East Asian (EAS) AF: 0.0337 AC: 175 AN: 5186

South Asian (SAS) AF: 0.205 AC: 987 AN: 4818

European-Finnish (FIN) AF: 0.280 AC: 2962 AN: 10594

Middle Eastern (MID) AF: 0.228 AC: 67 AN: 294

European-Non Finnish (NFE) AF: 0.309 AC: 21016 AN: 67996

Other (OTH) AF: 0.286 AC: 604 AN: 2110

Alfa AF: 0.295 Hom.: 3889

Bravo AF: 0.293

Asia WGS AF: 0.199 AC: 690 AN: 3478

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.95
CADD	Benign	0.90
DANN	Benign	0.31
PhyloP100		-0.56
Mutation Taster		=100/0	polymorphism (auto)

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

Other links and lift over

dbSNP: rs6666258; hg19: chr1-154814268;