rs16928285

Variant names:

• chr11-2459910-T-C
• rs16928285
• NM_000218.3:c.386+14426T>C

Variant summary

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

The NM_000218.3(KCNQ1):​c.386+14426T>C variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.293 in 151,962 control chromosomes in the GnomAD database, including 7,850 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 0.29 (7850 hom., cov: 32)
• Consequence: KCNQ1 NM_000218.3 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.0620
• Publications: 5 publications found

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]

KCNQ1 Gene-Disease associations (from GenCC):

• long QT syndrome

  Inheritance: AD Classification: DEFINITIVE Submitted by: ClinGen
• long QT syndrome 1

  Inheritance: AD, AR Classification: DEFINITIVE, STRONG Submitted by: Labcorp Genetics (formerly Invitae), G2P
• Jervell and Lange-Nielsen syndrome

  Inheritance: AR Classification: DEFINITIVE Submitted by: ClinGen
• Jervell and Lange-Nielsen syndrome 1

  Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: PanelApp Australia, Labcorp Genetics (formerly Invitae), G2P
• atrial fibrillation, familial, 3

  Inheritance: AD Classification: STRONG Submitted by: Labcorp Genetics (formerly Invitae)
• short QT syndrome

  Inheritance: AD Classification: STRONG, SUPPORTIVE Submitted by: ClinGen, Orphanet
• short QT syndrome type 2

  Inheritance: AD Classification: STRONG Submitted by: Labcorp Genetics (formerly Invitae), G2P
• familial atrial fibrillation

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• Jervell and Lange-Nielsen syndrome

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
• hypertrophic cardiomyopathy

  Inheritance: AD Classification: NO_KNOWN Submitted by: ClinGen

ACMG classification

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

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-1.0).
• BA1: GnomAd4 highest subpopulation (AFR) allele frequency at 95% confidence interval = 0.47 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
KCNQ1	NM_000218.3	c.386+14426T>C		intron_variant	Intron 1 of 15	ENST00000155840.12	NP_000209.2
KCNQ1	NM_001406836.1	c.386+14426T>C		intron_variant	Intron 1 of 14		NP_001393765.1
KCNQ1	NM_001406837.1	c.24+14426T>C		intron_variant	Intron 1 of 16		NP_001393766.1
KCNQ1	NM_001406838.1	c.386+14426T>C		intron_variant	Intron 1 of 10		NP_001393767.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
KCNQ1	ENST00000155840.12	c.386+14426T>C		intron_variant	Intron 1 of 15	1	NM_000218.3	ENSP00000155840.2

Frequencies

GnomAD3 genomes AF: 0.293 AC: 44462 AN: 151844 Hom.: 7805 Cov.: 32

Gnomad AFR AF: 0.475

Gnomad AMI AF: 0.148

Gnomad AMR AF: 0.336

Gnomad ASJ AF: 0.236

Gnomad EAS AF: 0.363

Gnomad SAS AF: 0.306

Gnomad FIN AF: 0.256

Gnomad MID AF: 0.266

Gnomad NFE AF: 0.178

Gnomad OTH AF: 0.270

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

GnomAD4 genome AF: 0.293 AC: 44565 AN: 151962 Hom.: 7850 Cov.: 32 AF XY: 0.299 AC XY: 22245 AN XY: 74294

African (AFR) AF: 0.476 AC: 19685 AN: 41396

American (AMR) AF: 0.337 AC: 5147 AN: 15292

Ashkenazi Jewish (ASJ) AF: 0.236 AC: 817 AN: 3466

East Asian (EAS) AF: 0.363 AC: 1871 AN: 5148

South Asian (SAS) AF: 0.305 AC: 1468 AN: 4820

European-Finnish (FIN) AF: 0.256 AC: 2710 AN: 10570

Middle Eastern (MID) AF: 0.262 AC: 77 AN: 294

European-Non Finnish (NFE) AF: 0.178 AC: 12086 AN: 67962

Other (OTH) AF: 0.271 AC: 569 AN: 2102

Alfa AF: 0.351 Hom.: 2655

Bravo AF: 0.308

Asia WGS AF: 0.422 AC: 1466 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	4.6
DANN	Benign	0.57
PhyloP100		0.062
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: rs16928285; hg19: chr11-2481140;