21-37916461-T-G

Variant names:

• chr21-37916461-T-G
• rs11702683
• ENST00000645093.1:c.-27-75752A>C

Variant summary

Our verdict is Likely benign. The variant received -2 ACMG points: 0P and 2B. BP4_Moderate

The ENST00000645093.1(KCNJ6):​c.-27-75752A>C variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000402 in 149,196 control chromosomes in the GnomAD database, with no homozygous occurrence. There is a variant allele frequency bias in the population database for this variant (GnomAd4), which may indicate mosaicism or somatic mutations in the reference population data. 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 0.000040 (0 hom., cov: 27)
• Consequence: KCNJ6 ENST00000645093.1 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 1.71
• Publications: 4 publications found

Genes affected

KCNJ6 (HGNC:6267): (potassium inwardly rectifying channel subfamily J member 6) This gene encodes a member of the G protein-coupled inwardly-rectifying potassium channel family of inward rectifier potassium channels. This type of potassium channel allows a greater flow of potassium into the cell than out of it. These proteins modulate many physiological processes, including heart rate in cardiac cells and circuit activity in neuronal cells, through G-protein coupled receptor stimulation. Mutations in this gene are associated with Keppen-Lubinsky Syndrome, a rare condition characterized by severe developmental delay, facial dysmorphism, and intellectual disability. [provided by RefSeq, Apr 2015]

KCNJ6 Gene-Disease associations (from GenCC):

• Keppen-Lubinsky syndrome

  Inheritance: AD Classification: STRONG, MODERATE, SUPPORTIVE Submitted by: Orphanet, Ambry Genetics, G2P, Labcorp Genetics (formerly Invitae)

ACMG classification

Our verdict: Likely_benign. The variant received -2 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.44).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
KCNJ6	NM_002240.5	c.-605A>C		upstream_gene_variant		ENST00000609713.2	NP_002231.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
KCNJ6	ENST00000645093.1	c.-27-75752A>C		intron_variant	Intron 2 of 4			ENSP00000493772.1
KCNJ6	ENST00000609713.2	c.-605A>C		upstream_gene_variant		1	NM_002240.5	ENSP00000477437.1

Frequencies

GnomAD3 genomes AF: 0.0000402 AC: 6 AN: 149196 Hom.: 0 Cov.: 27

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.000134

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.000214

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.0000449

Gnomad OTH AF: 0.00

GnomAD4 exome Cov.: 0

GnomAD4 genome AF: 0.0000402 AC: 6 AN: 149196 Hom.: 0 Cov.: 27 AF XY: 0.0000689 AC XY: 5 AN XY: 72590

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

African (AFR) AF: 0.00 AC: 0 AN: 40966

American (AMR) AF: 0.000134 AC: 2 AN: 14920

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3416

East Asian (EAS) AF: 0.00 AC: 0 AN: 5056

South Asian (SAS) AF: 0.000214 AC: 1 AN: 4664

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10134

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 312

European-Non Finnish (NFE) AF: 0.0000449 AC: 3 AN: 66776

Other (OTH) AF: 0.00 AC: 0 AN: 2044

⚠️ The allele balance in gnomAD version 4 Genomes is significantly skewed from the expected value of 0.5. (p-value = 0.000102688), which strongly suggests a high chance of mosaicism in these individuals.

Alfa AF: 0.00 Hom.: 3824

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.44
CADD	Benign	16
DANN	Benign	0.78
PhyloP100		1.7
PromoterAI		-0.18	Neutral

Splicing

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Other links and lift over

dbSNP: rs11702683; hg19: chr21-39288764;