rs2522018

Positions:

• chr11-2445289-C-A
• chr11-2445289-C-G

Variant summary

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

The NM_000218.3(KCNQ1):​c.191C>A​(p.Pro64His) 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.

• Frequency: Genomes: not found (cov: 32)
• Consequence: KCNQ1 NM_000218.3 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.401

Genes affected

KCNQ1 (HGNC:6294): (potassium voltage-gated channel subfamily Q member 1) This gene encodes a voltage-gated potassium channel required for repolarization phase of the cardiac action potential. This protein can form heteromultimers with two other potassium channel proteins, KCNE1 and KCNE3. Mutations in this gene are associated with hereditary long QT syndrome 1 (also known as Romano-Ward syndrome), Jervell and Lange-Nielsen syndrome, and familial atrial fibrillation. This gene exhibits tissue-specific imprinting, with preferential expression from the maternal allele in some tissues, and biallelic expression in others. This gene is located in a region of chromosome 11 amongst other imprinted genes that are associated with Beckwith-Wiedemann syndrome (BWS), and itself has been shown to be disrupted by chromosomal rearrangements in patients with BWS. Alternatively spliced transcript variants have been found for this gene. [provided by RefSeq, Aug 2011]

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=0.35406357).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
KCNQ1	NM_000218.3	c.191C>A	p.Pro64His	missense_variant	1/16	ENST00000155840.12	NP_000209.2
KCNQ1	NM_001406836.1	c.191C>A	p.Pro64His	missense_variant	1/15		NP_001393765.1
KCNQ1	NM_001406838.1	c.191C>A	p.Pro64His	missense_variant	1/11		NP_001393767.1
KCNQ1	NM_001406837.1	c.-172C>A		5_prime_UTR_variant	1/17		NP_001393766.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
KCNQ1	ENST00000155840.12	c.191C>A	p.Pro64His	missense_variant	1/16	1	NM_000218.3	ENSP00000155840	P1
KCNQ1	ENST00000646564.2	c.191C>A	p.Pro64His	missense_variant	1/11			ENSP00000495806
KCNQ1	ENST00000496887.7	c.24-94C>A		intron_variant		5		ENSP00000434560
KCNQ1	ENST00000345015.4			upstream_gene_variant		1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.14
BayesDel_addAF	Uncertain	0.066	T
BayesDel_noAF	Benign	-0.14
CADD	Benign	17
DANN	Uncertain	0.98
DEOGEN2	Benign	0.32	T
Eigen	Benign	-0.55
Eigen_PC	Benign	-0.73
FATHMM_MKL	Benign	0.059	N
LIST_S2	Benign	0.36	T
M_CAP	Pathogenic	0.95	D
MetaRNN	Benign	0.35	T
MetaSVM	Pathogenic	0.84	D
MutationAssessor	Benign	1.3	L
MutationTaster	Benign	1.0	N
PrimateAI	Pathogenic	0.84	D
PROVEAN	Benign	-0.60	N
REVEL	Uncertain	0.38
Sift	Uncertain	0.0040	D
Sift4G	Benign	0.11	T
Polyphen		0.88	P
Vest4		0.23
MutPred		0.26		Loss of glycosylation at P64 (P = 0.0047);
MVP		0.93
MPC		1.7
ClinPred		0.30	T
GERP RS		1.4
Varity_R		0.090
gMVP		0.27

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: rs2522018; hg19: chr11-2466519;