NM_170741.4:c.191C>G

Variant names:

• chr17-70132278-C-G
• rs1362013257
• NM_170741.4:c.191C>G

Variant summary

Our verdict is Likely pathogenic. The variant received 9 ACMG points: 9P and 0B. PM2 PM5 PP2 PP3_Strong

The NM_170741.4(KCNJ16):​c.191C>G​(p.Thr64Ser) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000000684 in 1,461,876 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. 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. T64I) has been classified as Pathogenic.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: KCNJ16 NM_170741.4 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 7.83
• Publications: 0 publications found

Genes affected

KCNJ16 (HGNC:6262): (potassium inwardly rectifying channel subfamily J member 16) 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 tends to allow potassium to flow into rather than out of a cell, can form heterodimers with two other inward-rectifier type potassium channels. It may function in fluid and pH balance regulation. Alternatively spliced transcript variants have been found for this gene. [provided by RefSeq, Apr 2014]

KCNJ16 Gene-Disease associations (from GenCC):

• hypokalemic alkalosis, familial, with specific renal tubulopathy

  Inheritance: AR Classification: DEFINITIVE Submitted by: ClinGen
• hypokalemic tubulopathy and deafness

  Inheritance: AR Classification: STRONG, MODERATE Submitted by: Labcorp Genetics (formerly Invitae), Ambry Genetics

ACMG classification

Our verdict: Likely_pathogenic. The variant received 9 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr17-70132278-C-T is described in ClinVar as Pathogenic. ClinVar VariationId is 1174521.Status of the report is no_assertion_criteria_provided, 0 stars.
• PP2: Missense variant in the gene, where a lot of missense mutations are associated with disease in ClinVar. The gene has 6 curated pathogenic missense variants (we use a threshold of 10). The gene has 1 curated benign missense variants. Gene score misZ: -0.0022041 (below the threshold of 3.09). Trascript score misZ: 0.47582 (below the threshold of 3.09). GenCC associations: The gene is linked to hypokalemic tubulopathy and deafness, hypokalemic alkalosis, familial, with specific renal tubulopathy.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.976

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_170741.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	KCNJ16	NM_170741.4	MANE Select	c.191C>G	p.Thr64Ser	missense	Exon 4 of 4	NP_733937.3	Q9NPI9
	KCNJ16	NM_001270422.2		c.191C>G	p.Thr64Ser	missense	Exon 6 of 6	NP_001257351.1	Q9NPI9
	KCNJ16	NM_001291622.3		c.191C>G	p.Thr64Ser	missense	Exon 6 of 6	NP_001278551.2	Q9NPI9

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	KCNJ16	ENST00000392671.6	TSL:2 MANE Select	c.191C>G	p.Thr64Ser	missense	Exon 4 of 4	ENSP00000376439.1	Q9NPI9
	KCNJ16	ENST00000283936.5	TSL:1	c.191C>G	p.Thr64Ser	missense	Exon 5 of 5	ENSP00000283936.1	Q9NPI9
	KCNJ16	ENST00000392670.5	TSL:1	c.191C>G	p.Thr64Ser	missense	Exon 4 of 4	ENSP00000376438.1	Q9NPI9

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 6.84e-7 AC: 1 AN: 1461876 Hom.: 0 Cov.: 32 AF XY: 0.00000138 AC XY: 1 AN XY: 727244

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: 39700

South Asian (SAS) AF: 0.00 AC: 0 AN: 86256

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53420

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

European-Non Finnish (NFE) AF: 8.99e-7 AC: 1 AN: 1111996

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

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.45
BayesDel_addAF	Pathogenic	0.40	D
BayesDel_noAF	Pathogenic	0.33
CADD	Uncertain	25
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.85	D
Eigen	Pathogenic	0.71
Eigen_PC	Pathogenic	0.68
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Uncertain	0.95	D
M_CAP	Uncertain	0.15	D
MetaRNN	Pathogenic	0.98	D
MetaSVM	Pathogenic	1.0	D
MutationAssessor	Uncertain	2.7	M
PhyloP100		7.8
PrimateAI	Uncertain	0.69	T
PROVEAN	Uncertain	-3.5	D
REVEL	Pathogenic	0.73
Sift	Pathogenic	0.0	D
Sift4G	Pathogenic	0.0	D
Polyphen		0.81	P
Vest4		0.83
MutPred		0.89		Gain of glycosylation at T64 (P = 0.0483)
MVP		0.92
MPC		0.41
ClinPred		0.99	D
GERP RS		6.2
Varity_R		0.80
gMVP		0.79

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: rs1362013257; hg19: chr17-68128419;