21-34448977-G-A

Variant names:

• chr21-34448977-G-A
• rs41314807
• NM_000219.6:c.*268C>T

Variant summary

Our verdict is Benign. The variant received -16 ACMG points: 0P and 16B. BP4_Strong BP6_Very_Strong BS1

The NM_000219.6(KCNE1):​c.*268C>T variant causes a 3 prime UTR change involving the alteration of a non-conserved nucleotide. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★).

• Frequency:
  • Genomes: 𝑓 0.010 (64 hom., cov: 11)
  • Exomes 𝑓: 0.0011 (1 hom.)
  • Failed GnomAD Quality Control
• Consequence: KCNE1 NM_000219.6 3_prime_UTR
• Clinical Significance: Benign/Likely benign criteria provided, multiple submitters, no conflicts B:5
• Conservation: PhyloP100: -0.414
• Publications: 1 publications found

Genes affected

KCNE1 (HGNC:6240): (potassium voltage-gated channel subfamily E regulatory subunit 1) The product of this gene belongs to the potassium channel KCNE family. Potassium ion channels are essential to many cellular functions and show a high degree of diversity, varying in their electrophysiologic and pharmacologic properties. This gene encodes a transmembrane protein known to associate with the product of the KVLQT1 gene to form the delayed rectifier potassium channel. Mutation in this gene are associated with both Jervell and Lange-Nielsen and Romano-Ward forms of long-QT syndrome. Alternatively spliced transcript variants encoding the same protein have been identified. [provided by RefSeq, Jul 2008]

KCNE1 Gene-Disease associations (from GenCC):

• long QT syndrome 5

  Inheritance: AD Classification: DEFINITIVE, STRONG, LIMITED Submitted by: G2P, Ambry Genetics, Labcorp Genetics (formerly Invitae), ClinGen
• Jervell and Lange-Nielsen syndrome 2

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

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
• atrial fibrillation

  Inheritance: AD Classification: LIMITED Submitted by: Ambry Genetics

ACMG classification

Our verdict: Benign. The variant received -16 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.88).
• BP6: Variant 21-34448977-G-A is Benign according to our data. Variant chr21-34448977-G-A is described in ClinVar as Benign/Likely_benign. ClinVar VariationId is 339766.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
• BS1: Variant frequency is greater than expected in population afr. GnomAdExome4 allele frequency = 0.00114 (203/177378) while in subpopulation AFR AF = 0.0195 (127/6514). AF 95% confidence interval is 0.0167. There are 1 homozygotes in GnomAdExome4. There are 84 alleles in the male GnomAdExome4 subpopulation. Median coverage is 0. This position passed quality control check.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_000219.6. 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
	KCNE1	NM_000219.6	MANE Select	c.*268C>T		3_prime_UTR	Exon 4 of 4	NP_000210.2	P15382
	KCNE1	NM_001127668.4		c.*268C>T		3_prime_UTR	Exon 3 of 3	NP_001121140.1	P15382
	KCNE1	NM_001127669.4		c.*268C>T		3_prime_UTR	Exon 3 of 3	NP_001121141.1	C7S316

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	KCNE1	ENST00000399286.3	TSL:1 MANE Select	c.*268C>T		3_prime_UTR	Exon 4 of 4	ENSP00000382226.2	P15382
	KCNE1	ENST00000399289.7	TSL:1	c.*268C>T		3_prime_UTR	Exon 3 of 3	ENSP00000382228.3	P15382
	KCNE1	ENST00000432085.5	TSL:1	c.*268C>T		3_prime_UTR	Exon 3 of 3	ENSP00000412498.1	P15382

Frequencies

GnomAD3 genomes AF: 0.0104 AC: 918 AN: 87990 Hom.: 64 Cov.: 11

Gnomad AFR AF: 0.0317

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00627

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00481

Gnomad NFE AF: 0.000104

Gnomad OTH AF: 0.0100

GnomAD4 exome AF: 0.00114 AC: 203 AN: 177378 Hom.: 1 Cov.: 0 AF XY: 0.000924 AC XY: 84 AN XY: 90880

African (AFR) AF: 0.0195 AC: 127 AN: 6514

American (AMR) AF: 0.00226 AC: 17 AN: 7510

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 5872

East Asian (EAS) AF: 0.00 AC: 0 AN: 12056

South Asian (SAS) AF: 0.00 AC: 0 AN: 13008

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 11346

Middle Eastern (MID) AF: 0.00360 AC: 3 AN: 834

European-Non Finnish (NFE) AF: 0.000174 AC: 19 AN: 108968

Other (OTH) AF: 0.00328 AC: 37 AN: 11270

GnomAD4 genome Data not reliable, filtered out with message: AS_VQSR AF: 0.0104 AC: 919 AN: 88102 Hom.: 64 Cov.: 11 AF XY: 0.00972 AC XY: 409 AN XY: 42088

African (AFR) AF: 0.0316 AC: 850 AN: 26930

American (AMR) AF: 0.00625 AC: 53 AN: 8476

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 2074

East Asian (EAS) AF: 0.00 AC: 0 AN: 2462

South Asian (SAS) AF: 0.00 AC: 0 AN: 2470

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 5550

Middle Eastern (MID) AF: 0.00532 AC: 1 AN: 188

European-Non Finnish (NFE) AF: 0.000104 AC: 4 AN: 38360

Other (OTH) AF: 0.00982 AC: 11 AN: 1120

Alfa AF: 0.00490 Hom.: 7

Asia WGS AF: 0.00231 AC: 8 AN: 3478

ClinVar

ClinVar submissions

Significance: Benign/Likely benign

Revision: criteria provided, multiple submitters, no conflicts

Pathogenic	VUS	Benign	Condition
-	-	2	not provided (2)
-	-	1	Congenital long QT syndrome (1)
-	-	1	Jervell and Lange-Nielsen syndrome 2 (1)
-	-	1	Long QT syndrome 5 (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.88
CADD	Benign	2.3
DANN	Benign	0.59
PhyloP100		-0.41
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

MaxEntScan Visualizer can be used to analyze the impact of this mutation on the neighboring sequence.

Other links and lift over

dbSNP: rs41314807; hg19: chr21-35821275;