NM_004519.4:c.*7413G>C

Variant names:

• chr8-132121849-C-G
• rs111267263
• NM_004519.4:c.*7413G>C

Variant summary

Our verdict is Benign. The variant received -20 ACMG points: 0P and 20B. BP4_Strong BP6_Very_Strong BS1 BS2

The NM_004519.4(KCNQ3):​c.*7413G>C variant causes a 3 prime UTR change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0155 in 152,260 control chromosomes in the GnomAD database, including 37 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★).

• Frequency:
  • Genomes: 𝑓 0.016 (37 hom., cov: 32)
  • Exomes 𝑓: 0.0 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: KCNQ3 NM_004519.4 3_prime_UTR
• Clinical Significance: Benign/Likely benign criteria provided, multiple submitters, no conflicts B:3
• Conservation: PhyloP100: -0.0150
• Publications: 0 publications found

Genes affected

KCNQ3 (HGNC:6297): (potassium voltage-gated channel subfamily Q member 3) This gene encodes a protein that functions in the regulation of neuronal excitability. The encoded protein forms an M-channel by associating with the products of the related KCNQ2 or KCNQ5 genes, which both encode integral membrane proteins. M-channel currents are inhibited by M1 muscarinic acetylcholine receptors and are activated by retigabine, a novel anti-convulsant drug. Defects in this gene are a cause of benign familial neonatal convulsions type 2 (BFNC2), also known as epilepsy, benign neonatal type 2 (EBN2). Alternative splicing of this gene results in multiple transcript variants. [provided by RefSeq, May 2014]

KCNQ3 Gene-Disease associations (from GenCC):

• complex neurodevelopmental disorder

  Inheritance: AD Classification: DEFINITIVE Submitted by: ClinGen
• seizures, benign familial neonatal, 2

  Inheritance: AD Classification: STRONG, MODERATE Submitted by: Ambry Genetics, Labcorp Genetics (formerly Invitae)
• self-limited familial neonatal epilepsy

  Inheritance: AD Classification: MODERATE Submitted by: ClinGen
• benign familial infantile epilepsy

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• benign neonatal seizures

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• genetic developmental and epileptic encephalopathy

  Inheritance: AR Classification: LIMITED Submitted by: Ambry Genetics, ClinGen

ACMG classification

Our verdict: Benign. The variant received -20 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.8).
• BP6: Variant 8-132121849-C-G is Benign according to our data. Variant chr8-132121849-C-G is described in ClinVar as Benign/Likely_benign. ClinVar VariationId is 361753.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
• BS1: Variant frequency is greater than expected in population nfe. GnomAd4 allele frequency = 0.0155 (2366/152260) while in subpopulation NFE AF = 0.0206 (1403/68028). AF 95% confidence interval is 0.0197. There are 37 homozygotes in GnomAd4. There are 1269 alleles in the male GnomAd4 subpopulation. Median coverage is 32. This position passed quality control check.
• BS2: High Homozygotes in GnomAd4 at 37 AD,AR gene

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_004519.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	KCNQ3	NM_004519.4	MANE Select	c.*7413G>C		3_prime_UTR	Exon 15 of 15	NP_004510.1	O43525-1
	KCNQ3	NM_001204824.2		c.*7413G>C		3_prime_UTR	Exon 15 of 15	NP_001191753.1	O43525-2

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	KCNQ3	ENST00000388996.10	TSL:1 MANE Select	c.*7413G>C		3_prime_UTR	Exon 15 of 15	ENSP00000373648.3	O43525-1

Frequencies

GnomAD3 genomes AF: 0.0156 AC: 2366 AN: 152142 Hom.: 37 Cov.: 32

Gnomad AFR AF: 0.00239

Gnomad AMI AF: 0.00110

Gnomad AMR AF: 0.00753

Gnomad ASJ AF: 0.0124

Gnomad EAS AF: 0.000193

Gnomad SAS AF: 0.0159

Gnomad FIN AF: 0.0562

Gnomad MID AF: 0.00949

Gnomad NFE AF: 0.0206

Gnomad OTH AF: 0.0134

GnomAD4 exome Data not reliable, filtered out with message: AC0 AF: 0.00 AC: 0 AN: 6 Hom.: 0 Cov.: 0 AF XY: 0.00 AC XY: 0 AN XY: 4

African (AFR) AC: 0 AN: 0

American (AMR) AC: 0 AN: 0

Ashkenazi Jewish (ASJ) AC: 0 AN: 0

East Asian (EAS) AC: 0 AN: 0

South Asian (SAS) AC: 0 AN: 0

European-Finnish (FIN) AC: 0 AN: 0

Middle Eastern (MID) AC: 0 AN: 0

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 6

Other (OTH) AC: 0 AN: 0

GnomAD4 genome AF: 0.0155 AC: 2366 AN: 152260 Hom.: 37 Cov.: 32 AF XY: 0.0170 AC XY: 1269 AN XY: 74440

African (AFR) AF: 0.00238 AC: 99 AN: 41552

American (AMR) AF: 0.00752 AC: 115 AN: 15298

Ashkenazi Jewish (ASJ) AF: 0.0124 AC: 43 AN: 3472

East Asian (EAS) AF: 0.000193 AC: 1 AN: 5176

South Asian (SAS) AF: 0.0162 AC: 78 AN: 4826

European-Finnish (FIN) AF: 0.0562 AC: 596 AN: 10596

Middle Eastern (MID) AF: 0.0102 AC: 3 AN: 294

European-Non Finnish (NFE) AF: 0.0206 AC: 1403 AN: 68028

Other (OTH) AF: 0.0128 AC: 27 AN: 2106

Alfa AF: 0.0250 Hom.: 11

Bravo AF: 0.0103

ClinVar

ClinVar submissions

Significance: Benign/Likely benign

Revision: criteria provided, multiple submitters, no conflicts

Pathogenic	VUS	Benign	Condition
-	-	1	Benign neonatal seizures (1)
-	-	1	not provided (1)
-	-	1	Seizures, benign familial neonatal, 2 (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.80
CADD	Benign	5.3
DANN	Benign	0.52
PhyloP100		-0.015
Mutation Taster		=100/0	polymorphism

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: rs111267263; hg19: chr8-133134096;