22-37061607-C-T

Variant summary

Our verdict is Benign. Variant got -8 ACMG points: 0P and 8B. BP4_StrongBS2

The NM_001282684.2(KCTD17):c.853C>T(p.Arg285Cys) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000419 in 1,599,556 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 13/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R285H) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.00025 ( 0 hom., cov: 32)

Exomes 𝑓: 0.00044 ( 0 hom. )

Consequence

KCTD17
NM_001282684.2 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:3

Conservation

PhyloP100: 0.0340

Variant links:

Genes affected

KCTD17 (HGNC:25705): (potassium channel tetramerization domain containing 17) This gene encodes a protein that belongs to a conserved family of potassium channel tetramerization domain (KCTD)-containing proteins. The encoded protein functions in ciliogenesis by acting as a substrate adaptor for the cullin3-based ubiquitin-conjugating enzyme E3 ligase, and targets trichoplein, a keratin-binding protein, for degradation via polyubiquitinylation. A mutation in this gene is associated with autosomal dominant myoclonic dystonia 26. [provided by RefSeq, Nov 2016]

KCTD17 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Benign. Variant got -8 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.025122344).

BS2

High AC in GnomAd at 37 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
KCTD17	NM_001282684.2 linkuse as main transcript	c.853C>T	p.Arg285Cys	missense_variant	8/9	ENST00000403888.8

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
KCTD17	ENST00000403888.8 linkuse as main transcript	c.853C>T	p.Arg285Cys	missense_variant	8/9	1	NM_001282684.2	A2

Frequencies

GnomAD3 genomes

AF:

0.000243

AC:

AN:

152208

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000193

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.0000941

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.000412

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.000194

AC:

AN:

236932

Hom.:

AF XY:

0.000194

AC XY:

AN XY:

129152

show subpopulations

Gnomad AFR exome

AF:

0.000383

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.000362

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.000437

AC:

632

AN:

1447230

Hom.:

Cov.:

AF XY:

0.000430

AC XY:

310

AN XY:

720272

show subpopulations

Gnomad4 AFR exome

AF:

0.000179

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.0000233

Gnomad4 FIN exome

AF:

0.0000246

Gnomad4 NFE exome

AF:

0.000548

Gnomad4 OTH exome

AF:

0.000233

GnomAD4 genome

AF:

0.000249

AC:

AN:

152326

Hom.:

Cov.:

AF XY:

0.000215

AC XY:

AN XY:

74488

show subpopulations

Gnomad4 AFR

AF:

0.000216

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.0000941

Gnomad4 NFE

AF:

0.000412

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.000288

Hom.:

Bravo

AF:

0.000185

TwinsUK

AF:

0.000539

AC:

ALSPAC

AF:

0.00156

AC:

ESP6500AA

AF:

0.000227

AC:

ESP6500EA

AF:

0.00

AC:

ExAC

AF:

0.000157

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:3

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Myoclonic dystonia 26

Uncertain:2

Uncertain significance, criteria provided, single submitter	clinical testing	Fulgent Genetics, Fulgent Genetics	Oct 31, 2018	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Invitae	Oct 03, 2023	This sequence change replaces arginine, which is basic and polar, with cysteine, which is neutral and slightly polar, at codon 292 of the KCTD17 protein (p.Arg292Cys). This variant is present in population databases (rs199921196, gnomAD 0.04%), and has an allele count higher than expected for a pathogenic variant. This variant has not been reported in the literature in individuals affected with KCTD17-related conditions. ClinVar contains an entry for this variant (Variation ID: 571150). Algorithms developed to predict the effect of missense changes on protein structure and function output the following: SIFT: "Not Available"; PolyPhen-2: "Benign"; Align-GVGD: "Not Available". The cysteine amino acid residue is found in multiple mammalian species, which suggests that this missense change does not adversely affect protein function. 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. -

Inborn genetic diseases

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Dec 21, 2022

The c.802C>T (p.R268C) alteration is located in exon 7 (coding exon 7) of the KCTD17 gene. This alteration results from a C to T substitution at nucleotide position 802, causing the arginine (R) at amino acid position 268 to be replaced by a cysteine (C). 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

0.14

BayesDel_addAF

Benign

-0.62

BayesDel_noAF

Benign

-0.69

Cadd

Benign

Dann

Uncertain

0.99

Eigen

Benign

-0.49

Eigen_PC

Benign

-0.37

FATHMM_MKL

Benign

0.18

LIST_S2

Benign

0.72

T;T

M_CAP

Benign

0.024

MetaRNN

Benign

0.025

T;T

MetaSVM

Benign

-0.99

MutationTaster

Benign

0.95

N;N

PrimateAI

Uncertain

0.49

PROVEAN

Benign

-0.75

N;N

REVEL

Benign

0.13

Sift

Benign

0.14

T;T

Sift4G

Benign

0.098

T;D

Polyphen

0.0010

B;B

Vest4

0.28

MVP

0.20

MPC

0.12

ClinPred

0.041

GERP RS

1.1

Varity_R

0.053

gMVP

0.15

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