2-26692977-G-T

Variant names:

• chr2-26692977-G-T
• NM_002246.3:c.102G>T

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 2P and 0B. PM2

The NM_002246.3(KCNK3):​c.102G>T​(p.Glu34Asp) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: KCNK3 NM_002246.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 5.21

Genes affected

KCNK3 (HGNC:6278): (potassium two pore domain channel subfamily K member 3) This gene encodes a member of the superfamily of potassium channel proteins that contain two pore-forming P domains. The encoded protein is an outwardly rectifying channel that is sensitive to changes in extracellular pH and is inhibited by extracellular acidification. Also referred to as an acid-sensitive potassium channel, it is activated by the anesthetics halothane and isoflurane. Although three transcripts are detected in northern blots, there is currently no sequence available to confirm transcript variants for this gene. [provided by RefSeq, Aug 2008]

ACMG classification

Verdict is Uncertain_significance. Variant got 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
KCNK3	NM_002246.3	c.102G>T	p.Glu34Asp	missense_variant	Exon 1 of 2	ENST00000302909.4	NP_002237.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
KCNK3	ENST00000302909.4	c.102G>T	p.Glu34Asp	missense_variant	Exon 1 of 2	1	NM_002246.3	ENSP00000306275.3

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Data not reliable, filtered out with message: AC0 AF: 0.00 AC: 0 AN: 1420358 Hom.: 0 Cov.: 31 AF XY: 0.00 AC XY: 0 AN XY: 704148

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Pulmonary hypertension, primary, 4 Uncertain:1

Jul 31, 2022

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Tolerated"; PolyPhen-2: "Probably Damaging"; Align-GVGD: "Class C0"). This variant has not been reported in the literature in individuals affected with KCNK3-related conditions. This variant is not present in population databases (gnomAD no frequency). This sequence change replaces glutamic acid, which is acidic and polar, with aspartic acid, which is acidic and polar, at codon 34 of the KCNK3 protein (p.Glu34Asp). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.93
BayesDel_addAF	Benign	-0.096	T
BayesDel_noAF	Benign	-0.38
CADD	Uncertain	25
DANN	Uncertain	0.99
DEOGEN2	Pathogenic	0.80	D
Eigen	Uncertain	0.29
Eigen_PC	Benign	0.15
FATHMM_MKL	Benign	0.57	D
LIST_S2	Benign	0.61	T
M_CAP	Pathogenic	0.32	D
MetaRNN	Uncertain	0.64	D
MetaSVM	Benign	-1.0	T
MutationAssessor	Uncertain	2.5	M
PrimateAI	Pathogenic	0.92	D
PROVEAN	Uncertain	-2.5	D
REVEL	Benign	0.19
Sift	Benign	0.047	D
Sift4G	Benign	0.061	T
Polyphen		0.99	D
Vest4		0.32
MutPred		0.53		Loss of glycosylation at P33 (P = 0.0763);
MVP		0.55
ClinPred		0.97	D
GERP RS		2.2
Varity_R		0.83
gMVP		0.92

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

No publications associated with this variant yet.

Other links and lift over

hg19: chr2-26915845;