Variant chr2-200490191-G-A details in Genebe, Genetics Data Aggregator

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 2P and 4B. PM2BP4_Strong

The NM_152387.4(KCTD18):c.1190C>T(p.Thr397Met) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000342 in 1,461,550 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 15/21 in silico tools predict a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

Frequency

Genomes: not found (cov: 33)

Exomes 𝑓: 0.0000034 ( 0 hom. )

Consequence

KCTD18
NM_152387.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: -2.33

Variant links:

Genes affected

KCTD18 (HGNC:26446): (potassium channel tetramerization domain containing 18) Predicted to be involved in protein homooligomerization. [provided by Alliance of Genome Resources, Apr 2022]

KCTD18 links:

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ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -2 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.0410327).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
KCTD18	NM_152387.4 linkuse as main transcript	c.1190C>T	p.Thr397Met	missense_variant	7/7	ENST00000359878.8	NP_689600.2	Q6PI47-1
KCTD18	NM_001321547.2 linkuse as main transcript	c.1190C>T	p.Thr397Met	missense_variant	7/7		NP_001308476.1	Q6PI47-1A8K4A2
KCTD18	NM_001321548.2 linkuse as main transcript	c.563C>T	p.Thr188Met	missense_variant	7/7		NP_001308477.1
KCTD18	NM_001321550.2 linkuse as main transcript	c.563C>T	p.Thr188Met	missense_variant	7/7		NP_001308479.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
KCTD18	ENST00000359878.8 linkuse as main transcript	c.1190C>T	p.Thr397Met	missense_variant	7/7	1	NM_152387.4	ENSP00000352941.3		Q6PI47-1
KCTD18	ENST00000409157.5 linkuse as main transcript	c.1190C>T	p.Thr397Met	missense_variant	7/7	1		ENSP00000386751.1		Q6PI47-1

Frequencies

GnomAD3 genomes

Cov.:

GnomAD3 exomes

AF:

0.0000119

AC:

AN:

251156

Hom.:

AF XY:

0.00000737

AC XY:

AN XY:

135754

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.0000544

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000176

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000342

AC:

AN:

1461550

Hom.:

Cov.:

AF XY:

0.00000138

AC XY:

AN XY:

727014

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.0000252

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00000270

Gnomad4 OTH exome

AF:

0.0000166

GnomAD4 genome

Cov.:

ExAC

AF:

0.0000165

AC:

Asia WGS

AF:

0.000289

AC:

AN:

3478

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Dec 03, 2024

The c.1190C>T (p.T397M) alteration is located in exon 7 (coding exon 6) of the KCTD18 gene. This alteration results from a C to T substitution at nucleotide position 1190, causing the threonine (T) at amino acid position 397 to be replaced by a methionine (M). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.081

BayesDel_addAF

Benign

-0.48

BayesDel_noAF

Benign

-0.76

CADD

Benign

0.018

DANN

Benign

0.90

DEOGEN2

Benign

0.0046

T;T

Eigen

Benign

-1.5

Eigen_PC

Benign

-1.6

FATHMM_MKL

Benign

0.013

LIST_S2

Benign

0.44

.;T

M_CAP

Benign

0.0068

MetaRNN

Benign

0.041

T;T

MetaSVM

Benign

-1.0

MutationAssessor

Benign

-0.34

N;N

PrimateAI

Benign

0.37

PROVEAN

Benign

-0.35

N;N

REVEL

Benign

0.052

Sift

Benign

0.042

D;D

Sift4G

Benign

0.080

T;T

Polyphen

0.010

B;B

Vest4

0.069

MutPred

0.084

Loss of glycosylation at T397 (P = 0.006);Loss of glycosylation at T397 (P = 0.006);

MVP

0.19

MPC

0.21

ClinPred

0.046

GERP RS

-1.6

Varity_R

0.015

gMVP

0.18

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

LitVar

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over