chr21-34447142-G-A

Variant names:

• chr21-34447142-G-A
• rs41312367
• NM_000219.6:c.*2103C>T

Variant summary

Our verdict is Benign. The variant received -12 ACMG points: 0P and 12B. BP4_Strong BP6_Very_Strong

The NM_000219.6(KCNE1):​c.*2103C>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 0.0019 (0 hom., cov: 0)
  • Failed GnomAD Quality Control
• Consequence: KCNE1 NM_000219.6 3_prime_UTR
• Clinical Significance: Benign/Likely benign criteria provided, multiple submitters, no conflicts B:4
• Conservation: PhyloP100: -1.25
• Publications: 0 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 -12 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.91).
• BP6: Variant 21-34447142-G-A is Benign according to our data. Variant chr21-34447142-G-A is described in ClinVar as Benign/Likely_benign. ClinVar VariationId is 339729.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

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.*2103C>T		3_prime_UTR	Exon 4 of 4	NP_000210.2	P15382
	KCNE1	NM_001127668.4		c.*2103C>T		3_prime_UTR	Exon 3 of 3	NP_001121140.1	P15382
	KCNE1	NM_001127669.4		c.*2103C>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.*2103C>T		3_prime_UTR	Exon 4 of 4	ENSP00000382226.2	P15382
	KCNE1	ENST00000399289.7	TSL:1	c.*2103C>T		3_prime_UTR	Exon 3 of 3	ENSP00000382228.3	P15382
	KCNE1	ENST00000432085.5	TSL:1	c.*2103C>T		3_prime_UTR	Exon 3 of 3	ENSP00000412498.1	P15382

Frequencies

GnomAD3 genomes AF: 0.00195 AC: 1 AN: 514 Hom.: 0 Cov.: 0

Gnomad AFR AF: 0.0116

Gnomad AMR AF: 0.00

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.00

Gnomad OTH AF: 0.00

GnomAD4 exome Cov.: 0

GnomAD4 genome Data not reliable, filtered out with message: AS_VQSR AF: 0.00193 AC: 1 AN: 518 Hom.: 0 Cov.: 0 AF XY: 0.00 AC XY: 0 AN XY: 252

⚠️ The allele balance in gnomAD version 4 Genomes is significantly skewed from the expected value of 0.5.

African (AFR) AF: 0.0111 AC: 1 AN: 90

American (AMR) AF: 0.00 AC: 0 AN: 90

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 10

East Asian (EAS) AF: 0.00 AC: 0 AN: 30

South Asian (SAS) AF: 0.00 AC: 0 AN: 48

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 36

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 2

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 194

Other (OTH) AF: 0.00 AC: 0 AN: 18

⚠️ The allele balance in gnomAD version 4 Genomes is significantly skewed from the expected value of 0.5. (p-value = 0), which strongly suggests a high chance of mosaicism in these individuals.

Alfa AF: 0.0208 Hom.: 16

Asia WGS AF: 0.00404 AC: 14 AN: 3478

ClinVar

ClinVar submissions

Significance: Benign/Likely benign

Revision: criteria provided, multiple submitters, no conflicts

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

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.91
CADD	Benign	0.26
DANN	Benign	0.64
PhyloP100		-1.2
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: rs41312367; hg19: chr21-35819440;