rs80356618

Positions:

• chr11-17387595-C-A
• chr11-17387595-C-T

Variant summary

Our verdict is Likely pathogenic. Variant got 8 ACMG points: 8P and 0B. PM2 PM5 PP3_Strong

The NM_000525.4(KCNJ11):​c.497G>T​(p.Cys166Phe) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as drug response (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. C166W) has been classified as Pathogenic.

• Frequency: Genomes: not found (cov: 33)
• Consequence: KCNJ11 NM_000525.4 missense
• Clinical Significance: drug response criteria provided, single submitter P:1 O:2
• Conservation: PhyloP100: 7.91

Genes affected

KCNJ11 (HGNC:6257): (potassium inwardly rectifying channel subfamily J member 11) 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 and is found associated with the sulfonylurea receptor SUR. Mutations in this gene are a cause of familial persistent hyperinsulinemic hypoglycemia of infancy (PHHI), an autosomal recessive disorder characterized by unregulated insulin secretion. Defects in this gene may also contribute to autosomal dominant non-insulin-dependent diabetes mellitus type II (NIDDM), transient neonatal diabetes mellitus type 3 (TNDM3), and permanent neonatal diabetes mellitus (PNDM). Multiple alternatively spliced transcript variants that encode different protein isoforms have been described for this gene. [provided by RefSeq, Oct 2009]

ACMG classification

Verdict is Likely_pathogenic. Variant got 8 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr11-17387594-G-C is described in Lovd as [Pathogenic].
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.988

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
KCNJ11	NM_000525.4	c.497G>T	p.Cys166Phe	missense_variant	1/1	ENST00000339994.5	NP_000516.3
KCNJ11	NM_001166290.2	c.236G>T	p.Cys79Phe	missense_variant	2/2		NP_001159762.1
KCNJ11	NM_001377296.1	c.236G>T	p.Cys79Phe	missense_variant	3/3		NP_001364225.1
KCNJ11	NM_001377297.1	c.236G>T	p.Cys79Phe	missense_variant	2/2		NP_001364226.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
KCNJ11	ENST00000339994.5	c.497G>T	p.Cys166Phe	missense_variant	1/1		NM_000525.4	ENSP00000345708	P1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 63

GnomAD4 genome Cov.: 33

ClinVar

Significance: drug response

Submissions summary: Pathogenic:1 Other:2

Revision: criteria provided, single submitter

Submissions by phenotype

Diabetes mellitus, permanent neonatal 2 Pathogenic:1

Pathogenic, no assertion criteria provided

literature only

OMIM

Jul 01, 2006

- -

Glibenclamide response Other:1

drug response, criteria provided, single submitter

research

Clinical Genomics, Uppaluri K&H Personalized Medicine Clinic

-

Mutations in KCNJ11 gene can cause decreased production and secretion of insulin. This can lead to MODY which may be responsive to oral sulfonylureas. However, this particular variant rs80356618 is associated with poor response to glibenclamide. -

Permanent neonatal diabetes mellitus Other:1

not provided, no classification provided

literature only

GeneReviews

-

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.64
BayesDel_addAF	Pathogenic	0.51	D
BayesDel_noAF	Pathogenic	0.49
CADD	Pathogenic	27
DANN	Uncertain	0.99
Eigen	Pathogenic	0.82
Eigen_PC	Pathogenic	0.78
FATHMM_MKL	Pathogenic	0.98	D
LIST_S2	Uncertain	0.92	D;.;T
M_CAP	Pathogenic	0.52	D
MetaRNN	Pathogenic	0.99	D;D;D
MetaSVM	Pathogenic	0.99	D
MutationTaster	Benign	1.0	D;D
PrimateAI	Uncertain	0.72	T
PROVEAN	Pathogenic	-9.0	D;D;D
REVEL	Pathogenic	0.94
Sift	Uncertain	0.016	D;D;D
Sift4G	Uncertain	0.021	D;D;.
Vest4		0.96
MutPred		0.92		Loss of catalytic residue at C166 (P = 0.171);.;.;
MVP		0.98
MPC		2.0
ClinPred		1.0	D
GERP RS		5.2
gMVP		0.99

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

Publications

LitVar

Other links and lift over

dbSNP: rs80356618; hg19: chr11-17409142;