NM_002241.5:c.136G>C

Variant names:

• chr1-160042397-C-G
• rs141553756
• NM_002241.5:c.136G>C

Variant summary

Our verdict is Uncertain significance. The variant received 3 ACMG points: 3P and 0B. PM2 PP2

The NM_002241.5(KCNJ10):​c.136G>C​(p.Asp46His) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000684 in 1,461,860 control chromosomes in the GnomAD database, with no homozygous occurrence. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. D46N) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: KCNJ10 NM_002241.5 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 3.25
• Publications: 0 publications found

Genes affected

KCNJ10 (HGNC:6256): (potassium inwardly rectifying channel subfamily J member 10) This gene encodes a member of the inward rectifier-type potassium channel family, characterized by having a greater tendency to allow potassium to flow into, rather than out of, a cell. The encoded protein may form a heterodimer with another potassium channel protein and may be responsible for the potassium buffering action of glial cells in the brain. Mutations in this gene have been associated with seizure susceptibility of common idiopathic generalized epilepsy syndromes. [provided by RefSeq, Jul 2008]

KCNJ10 Gene-Disease associations (from GenCC):

• EAST syndrome

  Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Orphanet, Ambry Genetics, PanelApp Australia, G2P, Labcorp Genetics (formerly Invitae), ClinGen
• Pendred syndrome

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
• enlarged vestibular aqueduct syndrome

  Inheritance: AD Classification: NO_KNOWN Submitted by: ClinGen

ACMG classification

Our verdict: Uncertain_significance. The variant received 3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant in the gene, where a lot of missense mutations are associated with disease in ClinVar. The gene has 14 curated pathogenic missense variants (we use a threshold of 10). The gene has 1 curated benign missense variants. Trascript score misZ: 2.7053 (below the threshold of 3.09). GenCC associations: The gene is linked to EAST syndrome, enlarged vestibular aqueduct syndrome, Pendred syndrome.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
KCNJ10	NM_002241.5	c.136G>C	p.Asp46His	missense_variant	Exon 2 of 2	ENST00000644903.1	NP_002232.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
KCNJ10	ENST00000644903.1	c.136G>C	p.Asp46His	missense_variant	Exon 2 of 2		NM_002241.5	ENSP00000495557.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 6.84e-7 AC: 1 AN: 1461860 Hom.: 0 Cov.: 32 AF XY: 0.00 AC XY: 0 AN XY: 727226

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

African (AFR) AF: 0.00 AC: 0 AN: 33480

American (AMR) AF: 0.00 AC: 0 AN: 44724

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26136

East Asian (EAS) AF: 0.00 AC: 0 AN: 39698

South Asian (SAS) AF: 0.00 AC: 0 AN: 86254

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53418

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5768

European-Non Finnish (NFE) AF: 8.99e-7 AC: 1 AN: 1111986

Other (OTH) AF: 0.00 AC: 0 AN: 60396

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0), which strongly suggests a high chance of mosaicism in these individuals.

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.37
BayesDel_addAF	Uncertain	0.12	D
BayesDel_noAF	Uncertain	-0.070
CADD	Pathogenic	27
DANN	Uncertain	0.99
DEOGEN2	Uncertain	0.51	.;.;D;D;.;D;D
Eigen	Uncertain	0.50
Eigen_PC	Uncertain	0.54
FATHMM_MKL	Uncertain	0.95	D
LIST_S2	Uncertain	0.90	D;D;.;.;D;.;D
M_CAP	Benign	0.052	D
MetaRNN	Uncertain	0.51	D;D;D;D;D;D;D
MetaSVM	Uncertain	0.66	D
MutationAssessor	Benign	1.3	.;.;L;L;.;L;L
PhyloP100		3.3
PrimateAI	Uncertain	0.67	T
PROVEAN	Benign	-0.53	.;.;.;N;.;.;.
REVEL	Uncertain	0.45
Sift	Benign	0.25	.;.;.;T;.;.;.
Sift4G	Benign	0.13	.;.;.;T;.;.;.
Polyphen		0.98	.;.;D;D;.;D;D
Vest4		0.37
MutPred		0.37		Gain of methylation at R48 (P = 0.044);Gain of methylation at R48 (P = 0.044);Gain of methylation at R48 (P = 0.044);Gain of methylation at R48 (P = 0.044);.;Gain of methylation at R48 (P = 0.044);Gain of methylation at R48 (P = 0.044);
MVP		0.53
MPC		1.5
ClinPred		0.94	D
GERP RS		5.2
PromoterAI		-0.026	Neutral
Varity_R		0.45
gMVP		0.82
Mutation Taster		=75/25	polymorphism

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: rs141553756; hg19: chr1-160012187;