rs34524779

chr12-21773326-G-C

Variant summary

Our verdict is Benign. Variant got -21 ACMG points: 0P and 21B. BP4_Strong BP6_Very_Strong BP7 BA1

The NM_004982.4(KCNJ8):c.291C>G(p.Ala97=) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00315 in 1,614,116 control chromosomes in the GnomAD database, including 133 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Benign (★★).

• Frequency:
  • Genomes: 𝑓 0.017 (64 hom., cov: 33)
  • Exomes 𝑓: 0.0017 (69 hom.)
• Consequence: KCNJ8 NM_004982.4 synonymous
• Clinical Significance: Benign criteria provided, multiple submitters, no conflicts B:5
• Conservation: PhyloP100: 3.37

Genes affected

KCNJ8 (HGNC:6269): (potassium inwardly rectifying channel subfamily J member 8) 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, is controlled by G-proteins. Defects in this gene may be a cause of J-wave syndromes and sudden infant death syndrome (SIDS). [provided by RefSeq, May 2012]

LOC105369689 (HGNC:):

ACMG classification

Verdict is Benign. Variant got -21 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.56).
• BP6: Variant 12-21773326-G-C is Benign according to our data. Variant chr12-21773326-G-C is described in ClinVar as [Benign]. Clinvar id is 137997.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr12-21773326-G-C is described in Lovd as [Benign].
• BP7: Synonymous conserved (PhyloP=3.37 with no splicing effect.
• BA1: GnomAd4 highest subpopulation (AFR) allele frequency at 95% confidence interval = 0.056 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
KCNJ8	NM_004982.4	c.291C>G	p.Ala97=	synonymous_variant	2/3	ENST00000240662.3
LOC105369689	XR_007063241.1	n.631+13241G>C		intron_variant, non_coding_transcript_variant

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
KCNJ8	ENST00000240662.3	c.291C>G	p.Ala97=	synonymous_variant	2/3	1	NM_004982.4	P1

Frequencies

GnomAD3 genomes AF: 0.0168 AC: 2552 AN: 152148 Hom.: 65 Cov.: 33

Gnomad AFR AF: 0.0581

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00733

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00316

Gnomad NFE AF: 0.0000441

Gnomad OTH AF: 0.0143

GnomAD3 exomes AF: 0.00438 AC: 1101 AN: 251470 Hom.: 40 AF XY: 0.00302 AC XY: 411 AN XY: 135906

Gnomad AFR exome AF: 0.0605

Gnomad AMR exome AF: 0.00249

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.0000980

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.000132

Gnomad OTH exome AF: 0.00228

GnomAD4 exome AF: 0.00173 AC: 2524 AN: 1461850 Hom.: 69 Cov.: 31 AF XY: 0.00148 AC XY: 1077 AN XY: 727224

Gnomad4 AFR exome AF: 0.0624

Gnomad4 AMR exome AF: 0.00264

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.0000696

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.0000486

Gnomad4 OTH exome AF: 0.00411

GnomAD4 genome AF: 0.0168 AC: 2554 AN: 152266 Hom.: 64 Cov.: 33 AF XY: 0.0164 AC XY: 1221 AN XY: 74462

Gnomad4 AFR AF: 0.0580

Gnomad4 AMR AF: 0.00732

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.0000441

Gnomad4 OTH AF: 0.0142

Alfa AF: 0.00457 Hom.: 4

Bravo AF: 0.0193

Asia WGS AF: 0.00462 AC: 16 AN: 3478

EpiCase AF: 0.00

EpiControl AF: 0.000119

ClinVar

Significance: Benign

Submissions summary: Benign:5

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not specified Benign:3

Benign, no assertion criteria provided	clinical testing	Joint Genome Diagnostic Labs from Nijmegen and Maastricht, Radboudumc and MUMC+	-	- -
Benign, criteria provided, single submitter	clinical testing	GeneDx	Jan 16, 2014	This variant is considered likely benign or benign based on one or more of the following criteria: it is a conservative change, it occurs at a poorly conserved position in the protein, it is predicted to be benign by multiple in silico algorithms, and/or has population frequency not consistent with disease. -
Benign, no assertion criteria provided	clinical testing	Clinical Genetics, Academic Medical Center	-	- -

Brugada syndrome Benign:1

Benign, criteria provided, single submitter

clinical testing

Invitae

Jan 31, 2024

- -

Cardiovascular phenotype Benign:1

Benign, criteria provided, single submitter

clinical testing

Ambry Genetics

Jul 27, 2015

This alteration is classified as benign based on a combination of the following: seen in unaffected individuals, population frequency, intact protein function, lack of segregation with disease, co-occurrence, RNA analysis, in silico models, amino acid conservation, lack of disease association in case-control studies, and/or the mechanism of disease or impacted region is inconsistent with a known cause of pathogenicity. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.56
Cadd	Benign	12
Dann	Benign	0.86

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.020		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: rs34524779; hg19: chr12-21926260;