Genetic Variant KCNK3:p.Leu122Leu (chr2-26727749-C-T) – ACMG Classification: Benign (-17 pts)

Variant summary

Our verdict is Benign. The variant received -17 ACMG points: 0P and 17B. BP4_StrongBP6_Very_StrongBP7BS2

The NM_002246.3(KCNK3):c.366C>T(p.Leu122Leu) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000465 in 1,587,600 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★). Synonymous variant affecting the same amino acid position (i.e. L122L) has been classified as Likely benign.

Frequency

Genomes: 𝑓 0.00035 ( 0 hom., cov: 33)

Exomes 𝑓: 0.00048 ( 0 hom. )

Consequence

KCNK3
NM_002246.3 synonymous

Scores

Clinical Significance

Likely benign criteria provided, multiple submitters, no conflicts B:2

Conservation

PhyloP100: 0.0580

Publications

0 publications found

Variant links:

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]

KCNK3 Gene-Disease associations (from GenCC):

pulmonary arterial hypertension
Inheritance: AD Classification: DEFINITIVE Submitted by: ClinGen
pulmonary hypertension, primary, 4
Inheritance: AD Classification: STRONG Submitted by: Labcorp Genetics (formerly Invitae)
heritable pulmonary arterial hypertension
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

KCNK3 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -17 ACMG points.

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.48).

BP6

Variant 2-26727749-C-T is Benign according to our data. Variant chr2-26727749-C-T is described in ClinVar as Likely_benign. ClinVar VariationId is 474320.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

BP7

Synonymous conserved (PhyloP=0.058 with no splicing effect.

BS2

High AC in GnomAd4 at 53 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
KCNK3	NM_002246.3 link	c.366C>T	p.Leu122Leu	synonymous_variant	Exon 2 of 2	ENST00000302909.4	NP_002237.1
KCNK3	XM_005264293.3 link	c.36C>T	p.Leu12Leu	synonymous_variant	Exon 2 of 2		XP_005264350.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
KCNK3	ENST00000302909.4 link	c.366C>T	p.Leu122Leu	synonymous_variant	Exon 2 of 2	1	NM_002246.3	ENSP00000306275.3

Frequencies

GnomAD3 genomes

AF:

0.000348

AC:

AN:

152242

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000241

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000327

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.000558

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.000229

AC:

AN:

235476

AF XY:

0.000221

show subpopulations

Gnomad AFR exome

AF:

0.000124

Gnomad AMR exome

AF:

0.000184

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.0000970

Gnomad NFE exome

AF:

0.000392

Gnomad OTH exome

AF:

0.000352

GnomAD4 exome

AF:

0.000478

AC:

686

AN:

1435240

Hom.:

Cov.:

AF XY:

0.000458

AC XY:

325

AN XY:

710104

show subpopulations

African (AFR)

AF:

0.000152

AC:

AN:

32960

American (AMR)

AF:

0.000188

AC:

AN:

42632

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

24444

East Asian (EAS)

AF:

0.00

AC:

AN:

39366

South Asian (SAS)

AF:

0.00

AC:

AN:

82356

European-Finnish (FIN)

AF:

0.0000571

AC:

AN:

52560

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5636

European-Non Finnish (NFE)

AF:

0.000592

AC:

649

AN:

1096118

Other (OTH)

AF:

0.000355

AC:

AN:

59168

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.483

Heterozygous variant carriers

128

171

214

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Variant carriers

120

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.000348

AC:

AN:

152360

Hom.:

Cov.:

AF XY:

0.000376

AC XY:

AN XY:

74494

show subpopulations

African (AFR)

AF:

0.000240

AC:

AN:

41588

American (AMR)

AF:

0.000327

AC:

AN:

15310

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3472

East Asian (EAS)

AF:

0.00

AC:

AN:

5188

South Asian (SAS)

AF:

0.00

AC:

AN:

4830

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10618

Middle Eastern (MID)

AF:

0.00

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.000559

AC:

AN:

68032

Other (OTH)

AF:

0.00

AC:

AN:

2116

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.528

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

Alfa

AF:

0.000225

Hom.:

Bravo

AF:

0.000393

ClinVar

Significance: Likely benign

Submissions summary: Benign:2

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Pulmonary hypertension, primary, 4

Benign:2

Jan 06, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Jun 17, 2020

ARUP Laboratories, Molecular Genetics and Genomics, ARUP Laboratories

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.48

CADD

Benign

9.5

(source)

DANN

Benign

0.80

PhyloP100

0.058

Mutation Taster

=100/0

polymorphism

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.010

Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over