1-40784269-C-A

Variant names:

• chr1-40784269-C-A
• rs775420649
• NM_004700.4:c.176C>A

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 2P and 1B. PM2 BP4

The NM_004700.4(KCNQ4):​c.176C>A​(p.Pro59His) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. P59L) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: KCNQ4 NM_004700.4 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.140

Genes affected

KCNQ4 (HGNC:6298): (potassium voltage-gated channel subfamily Q member 4) The protein encoded by this gene forms a potassium channel that is thought to play a critical role in the regulation of neuronal excitability, particularly in sensory cells of the cochlea. The current generated by this channel is inhibited by M1 muscarinic acetylcholine receptors and activated by retigabine, a novel anti-convulsant drug. The encoded protein can form a homomultimeric potassium channel or possibly a heteromultimeric channel in association with the protein encoded by the KCNQ3 gene. Defects in this gene are a cause of nonsyndromic sensorineural deafness type 2 (DFNA2), an autosomal dominant form of progressive hearing loss. Two transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Uncertain_significance. Variant got 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.29900765).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
KCNQ4	NM_004700.4	c.176C>A	p.Pro59His	missense_variant	Exon 1 of 14	ENST00000347132.10	NP_004691.2
KCNQ4	NM_172163.3	c.176C>A	p.Pro59His	missense_variant	Exon 1 of 13		NP_751895.1
KCNQ4	XM_047434057.1	c.176C>A	p.Pro59His	missense_variant	Exon 1 of 13		XP_047290013.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
KCNQ4	ENST00000347132.10	c.176C>A	p.Pro59His	missense_variant	Exon 1 of 14	1	NM_004700.4	ENSP00000262916.6
KCNQ4	ENST00000509682.6	c.176C>A	p.Pro59His	missense_variant	Exon 1 of 13	5		ENSP00000423756.2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Data not reliable, filtered out with message: AC0 AF: 0.00 AC: 0 AN: 1361358 Hom.: 0 Cov.: 31 AF XY: 0.00 AC XY: 0 AN XY: 672996

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.13
BayesDel_addAF	Uncertain	0.073	D
BayesDel_noAF	Benign	-0.13
CADD	Uncertain	24
DANN	Uncertain	0.99
DEOGEN2	Benign	0.27	T;T;.
Eigen	Benign	-0.13
Eigen_PC	Benign	-0.20
FATHMM_MKL	Benign	0.58	D
LIST_S2	Benign	0.48	.;T;T
M_CAP	Pathogenic	0.97	D
MetaRNN	Benign	0.30	T;T;T
MetaSVM	Pathogenic	0.90	D
MutationAssessor	Benign	1.1	L;L;L
PrimateAI	Pathogenic	0.93	D
PROVEAN	Benign	-1.2	.;N;N
REVEL	Uncertain	0.38
Sift	Benign	0.099	.;T;T
Sift4G	Uncertain	0.021	.;D;D
Polyphen		0.98	D;D;D
Vest4		0.21, 0.24
MutPred		0.19		Loss of glycosylation at P59 (P = 0.0519);Loss of glycosylation at P59 (P = 0.0519);Loss of glycosylation at P59 (P = 0.0519);
MVP		0.67
MPC		2.4
ClinPred		0.53	D
GERP RS		2.3
Varity_R		0.17
gMVP		0.56

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: rs775420649; hg19: chr1-41249941;