chr17-70169740-C-T

Variant names:

• chr17-70169740-C-T
• rs9906926
• NM_000891.3:c.-217+39C>T

Variant summary

Our verdict is Benign. The variant received -20 ACMG points: 0P and 20B. BP4_Strong BP6_Very_Strong BA1

The NM_000891.3(KCNJ2):​c.-217+39C>T variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0612 in 153,612 control chromosomes in the GnomAD database, including 982 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Benign (★★).

• Frequency:
  • Genomes: 𝑓 0.062 (978 hom., cov: 32)
  • Exomes 𝑓: 0.012 (4 hom.)
• Consequence: KCNJ2 NM_000891.3 intron
• Clinical Significance: Benign criteria provided, multiple submitters, no conflicts B:2
• Conservation: PhyloP100: 0.146
• Publications: 1 publications found

Genes affected

KCNJ2 (HGNC:6263): (potassium inwardly rectifying channel subfamily J member 2) Potassium channels are present in most mammalian cells, where they participate in a wide range of physiologic responses. The protein encoded by this gene is an integral membrane protein and inward-rectifier type potassium channel. The encoded protein, which has a greater tendency to allow potassium to flow into a cell rather than out of a cell, probably participates in establishing action potential waveform and excitability of neuronal and muscle tissues. Mutations in this gene have been associated with Andersen syndrome, which is characterized by periodic paralysis, cardiac arrhythmias, and dysmorphic features. [provided by RefSeq, Jul 2008]

KCNJ2 Gene-Disease associations (from GenCC):

• Andersen-Tawil syndrome

  Inheritance: AD Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Genomics England PanelApp, Orphanet, G2P, Labcorp Genetics (formerly Invitae)
• short QT syndrome type 3

  Inheritance: AD Classification: STRONG, MODERATE Submitted by: G2P, Labcorp Genetics (formerly Invitae)
• short QT syndrome

  Inheritance: AD Classification: MODERATE, SUPPORTIVE Submitted by: ClinGen, Orphanet
• familial atrial fibrillation

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• catecholaminergic polymorphic ventricular tachycardia

  Inheritance: AD Classification: LIMITED, NO_KNOWN Submitted by: ClinGen, Genomics England PanelApp
• long QT syndrome

  Inheritance: AD Classification: LIMITED Submitted by: ClinGen

ACMG classification

Our verdict: Benign. The variant received -20 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.82).
• BP6: Variant 17-70169740-C-T is Benign according to our data. Variant chr17-70169740-C-T is described in ClinVar as [Benign]. Clinvar id is 1229696.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
• BA1: GnomAd4 highest subpopulation (AFR) allele frequency at 95% confidence interval = 0.21 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
KCNJ2	NM_000891.3	c.-217+39C>T		intron_variant	Intron 1 of 1	ENST00000243457.4	NP_000882.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
KCNJ2	ENST00000243457.4	c.-217+39C>T		intron_variant	Intron 1 of 1	1	NM_000891.3	ENSP00000243457.2
KCNJ2	ENST00000535240.1	c.-217+883C>T		intron_variant	Intron 1 of 1	1		ENSP00000441848.1

Frequencies

GnomAD3 genomes AF: 0.0614 AC: 9344 AN: 152074 Hom.: 965 Cov.: 32

Gnomad AFR AF: 0.214

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.0225

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00145

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.0158

Gnomad NFE AF: 0.000897

Gnomad OTH AF: 0.0455

GnomAD4 exome AF: 0.0120 AC: 17 AN: 1420 Hom.: 4 Cov.: 0 AF XY: 0.00642 AC XY: 7 AN XY: 1090

African (AFR) AF: 0.350 AC: 14 AN: 40

American (AMR) AF: 0.0417 AC: 1 AN: 24

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 22

East Asian (EAS) AF: 0.00 AC: 0 AN: 46

South Asian (SAS) AF: 0.00 AC: 0 AN: 20

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 32

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 10

European-Non Finnish (NFE) AF: 0.000865 AC: 1 AN: 1156

Other (OTH) AF: 0.0143 AC: 1 AN: 70

GnomAD4 genome AF: 0.0617 AC: 9387 AN: 152192 Hom.: 978 Cov.: 32 AF XY: 0.0599 AC XY: 4459 AN XY: 74402

African (AFR) AF: 0.214 AC: 8878 AN: 41480

American (AMR) AF: 0.0224 AC: 343 AN: 15296

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3468

East Asian (EAS) AF: 0.00 AC: 0 AN: 5164

South Asian (SAS) AF: 0.00104 AC: 5 AN: 4830

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10620

Middle Eastern (MID) AF: 0.0170 AC: 5 AN: 294

European-Non Finnish (NFE) AF: 0.000897 AC: 61 AN: 68016

Other (OTH) AF: 0.0450 AC: 95 AN: 2112

Alfa AF: 0.0673 Hom.: 139

Bravo AF: 0.0711

Asia WGS AF: 0.0130 AC: 46 AN: 3478

ClinVar

Significance: Benign

Submissions summary: Benign:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Benign:2

-

Breakthrough Genomics, Breakthrough Genomics

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: not provided

- -

May 03, 2019

GeneDx

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.82
CADD	Benign	16
DANN	Benign	0.85
PhyloP100		0.15
PromoterAI		-0.035	Neutral
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: rs9906926; hg19: chr17-68165881;