11-17387366-G-T

Variant names:

• chr11-17387366-G-T
• rs72554078
• NM_000525.4:c.726C>A

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 2P and 0B. PM2

The NM_000525.4(KCNJ11):​c.726C>A​(p.Asn242Lys) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Synonymous variant affecting the same amino acid position (i.e. N242N) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 33)
• Consequence: KCNJ11 NM_000525.4 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.167
• Publications: 0 publications found

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]

KCNJ11 Gene-Disease associations (from GenCC):

• diabetes mellitus, transient neonatal, 3

  Inheritance: AD Classification: DEFINITIVE, STRONG, LIMITED Submitted by: Labcorp Genetics (formerly Invitae), Genomics England PanelApp, G2P
• monogenic diabetes

  Inheritance: AD Classification: DEFINITIVE Submitted by: ClinGen
• hyperinsulinemic hypoglycemia, familial, 2

  Inheritance: AR, AD Classification: DEFINITIVE, STRONG Submitted by: Genomics England PanelApp, Myriad Women’s Health, Labcorp Genetics (formerly Invitae), G2P, Ambry Genetics
• diabetes mellitus, noninsulin-dependent

  Inheritance: AD Classification: STRONG Submitted by: Genomics England PanelApp
• diabetes mellitus, permanent neonatal 2

  Inheritance: AD Classification: STRONG Submitted by: Genomics England PanelApp
• maturity-onset diabetes of the young type 13

  Inheritance: AD Classification: STRONG Submitted by: Genomics England PanelApp, Labcorp Genetics (formerly Invitae)
• autosomal dominant hyperinsulinism due to Kir6.2 deficiency

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• DEND syndrome

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• intermediate DEND syndrome

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• maturity-onset diabetes of the young

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• permanent neonatal diabetes mellitus

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• transient neonatal diabetes mellitus

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• autosomal recessive hyperinsulinism due to Kir6.2 deficiency

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
• diazoxide-resistant focal hyperinsulinism due to Kir6.2 deficiency

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Uncertain_significance. The variant received 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
KCNJ11	NM_000525.4	c.726C>A	p.Asn242Lys	missense_variant	Exon 1 of 1	ENST00000339994.5	NP_000516.3
KCNJ11	NM_001166290.2	c.465C>A	p.Asn155Lys	missense_variant	Exon 2 of 2		NP_001159762.1
KCNJ11	NM_001377296.1	c.465C>A	p.Asn155Lys	missense_variant	Exon 3 of 3		NP_001364225.1
KCNJ11	NM_001377297.1	c.465C>A	p.Asn155Lys	missense_variant	Exon 2 of 2		NP_001364226.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
KCNJ11	ENST00000339994.5	c.726C>A	p.Asn242Lys	missense_variant	Exon 1 of 1	6	NM_000525.4	ENSP00000345708.4

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 67

GnomAD4 genome Cov.: 33

Alfa AF: 0.00 Hom.: 0

Bravo AF: 0.00000378

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.55
BayesDel_addAF	Uncertain	0.067	T
BayesDel_noAF	Benign	-0.14
CADD	Benign	0.44
DANN	Uncertain	0.99
Eigen	Benign	-0.22
Eigen_PC	Benign	-0.19
FATHMM_MKL	Uncertain	0.81	D
LIST_S2	Uncertain	0.89	D;.
M_CAP	Benign	0.073	D
MetaRNN	Uncertain	0.72	D;D
MetaSVM	Uncertain	0.17	D
PhyloP100		0.17
PrimateAI	Uncertain	0.72	T
PROVEAN	Benign	-1.6	N;N
REVEL	Uncertain	0.40
Sift	Benign	0.095	T;T
Sift4G	Benign	0.23	T;T
Vest4		0.64
MutPred		0.51		Gain of ubiquitination at N242 (P = 0.0138);.;
MVP		0.97
MPC		1.2
ClinPred		0.84	D
GERP RS		-0.11
gMVP		0.91
Mutation Taster		=7/93	disease causing

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: rs72554078; hg19: chr11-17408913;