7-66629140-G-T

Variant names:

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 4P and 2B. PM1PM2BP4_Moderate

The NM_153033.5(KCTD7):c.76G>T(p.Asp26Tyr) variant causes a missense change. The variant allele was found at a frequency of 0.0000887 in 1,533,332 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 Uncertain significance (★★).

Frequency

Genomes: 𝑓 0.000066 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000091 ( 0 hom. )

Consequence

KCTD7
NM_153033.5 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:5

Conservation

PhyloP100: 5.17

Variant links:

Genes affected

KCTD7 (HGNC:21957): (potassium channel tetramerization domain containing 7) This gene encodes a member of the potassium channel tetramerization domain-containing protein family. Family members are identified on a structural basis and contain an amino-terminal domain similar to the T1 domain present in the voltage-gated potassium channel. Mutations in this gene have been associated with progressive myoclonic epilepsy-3. Alternative splicing results in multiple transcript variants.[provided by RefSeq, Jan 2011]

KCTD7 links:

ENSG00000284461 (HGNC:):

ENSG00000284461 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 2 ACMG points.

PM1

In a chain BTB/POZ domain-containing protein KCTD7 (size 288) in uniprot entity KCTD7_HUMAN there are 7 pathogenic changes around while only 2 benign (78%) in NM_153033.5

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.18562734).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
KCTD7	NM_153033.5 link	c.76G>T	p.Asp26Tyr	missense_variant	Exon 1 of 4	ENST00000639828.2	NP_694578.1	Q96MP8-1A0A024RDN7
KCTD7	NM_001167961.2 link	c.76G>T	p.Asp26Tyr	missense_variant	Exon 1 of 5		NP_001161433.1	Q96MP8-2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
KCTD7	ENST00000639828.2 link	c.76G>T	p.Asp26Tyr	missense_variant	Exon 1 of 4	2	NM_153033.5	ENSP00000492240.1		Q96MP8-1
ENSG00000284461	ENST00000503687.2 link	n.76G>T		non_coding_transcript_exon_variant	Exon 1 of 13	2		ENSP00000421074.1		E9PHB8

Frequencies

GnomAD3 genomes

AF:

0.0000658

AC:

AN:

151920

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000131

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:

0.000103

Gnomad OTH

AF:

0.000480

GnomAD3 exomes

AF:

0.0000415

AC:

AN:

168536

Hom.:

AF XY:

0.0000427

AC XY:

AN XY:

93724

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.000125

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:

0.0000526

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000912

AC:

126

AN:

1381412

Hom.:

Cov.:

AF XY:

0.0000846

AC XY:

AN XY:

685298

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.000115

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:

0.000109

Gnomad4 OTH exome

AF:

0.0000530

GnomAD4 genome

AF:

0.0000658

AC:

AN:

151920

Hom.:

Cov.:

AF XY:

0.0000808

AC XY:

AN XY:

74218

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.000131

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.000103

Gnomad4 OTH

AF:

0.000480

Alfa

AF:

0.000141

Hom.:

Bravo

AF:

0.0000642

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.000117

AC:

ExAC

AF:

0.0000252

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:5

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Progressive myoclonic epilepsy type 3

Uncertain:2

Sep 07, 2022

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces aspartic acid, which is acidic and polar, with tyrosine, which is neutral and polar, at codon 26 of the KCTD7 protein (p.Asp26Tyr). The frequency data for this variant in the population databases is considered unreliable, as metrics indicate poor data quality at this position in the gnomAD database. This variant has not been reported in the literature in individuals affected with KCTD7-related conditions. ClinVar contains an entry for this variant (Variation ID: 206019). 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: "Deleterious"; PolyPhen-2: "Benign"; Align-GVGD: "Class C0"). 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. -

Jan 12, 2018

Illumina Laboratory Services, Illumina

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score, this variant could not be ruled out of causing disease and therefore its association with disease required further investigation. A literature search was performed for the gene, cDNA change, and amino acid change (if applicable). No publications were found based on this search. This variant was therefore classified as a variant of unknown significance for this disease. -

not specified

Uncertain:1

Nov 07, 2016

Athena Diagnostics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Inborn genetic diseases

Uncertain:1

May 24, 2017

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The p.D26Y variant (also known as c.76G>T), located in coding exon 1 of the KCTD7 gene, results from a G to T substitution at nucleotide position 76. The aspartic acid at codon 26 is replaced by tyrosine, an amino acid with highly dissimilar properties. This amino acid position is well conserved in available vertebrate species. In addition, this alteration is predicted to be tolerated by in silico analysis. Since supporting evidence is limited at this time, the clinical significance of this alteration remains unclear. -

not provided

Uncertain:1

Dec 21, 2021

GeneDx

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

In silico analysis supports that this missense variant has a deleterious effect on protein structure/function; Has not been previously published as pathogenic or benign to our knowledge -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.17

BayesDel_addAF

Benign

-0.15

BayesDel_noAF

Benign

-0.21

CADD

Pathogenic

DANN

Uncertain

0.99

DEOGEN2

Benign

0.020

T;.;.;.;.;.

Eigen

Benign

-0.049

Eigen_PC

Benign

0.033

FATHMM_MKL

Uncertain

0.79

LIST_S2

Uncertain

0.90

D;D;D;D;D;D

M_CAP

Pathogenic

0.71

MetaRNN

Benign

0.19

T;T;T;T;T;T

MetaSVM

Benign

-0.84

MutationAssessor

Benign

0.55

N;.;.;N;.;.

PrimateAI

Pathogenic

0.96

PROVEAN

Benign

-0.31

.;N;.;N;.;.

REVEL

Benign

0.23

Sift

Uncertain

0.0040

.;D;.;D;.;.

Sift4G

Uncertain

0.011

.;D;.;D;.;.

Polyphen

0.74

P;.;.;.;.;.

Vest4

0.38, 0.48

MVP

0.75

ClinPred

0.26

GERP RS

4.0

Varity_R

0.25

gMVP

0.42

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