Genetic Variant KCTD4:p.Arg171His (chr13-45194056-C-T) – ACMG Classification: Uncertain_significance (2 pts)

Variant summary

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

The NM_198404.3(KCTD4):c.512G>A(p.Arg171His) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000015 in 1,461,808 control chromosomes in the GnomAD database, with no homozygous occurrence. 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. R171C) has been classified as Uncertain significance.

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 0.000015 ( 0 hom. )

Consequence

KCTD4
NM_198404.3 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 7.57

Variant links:

Genes affected

KCTD4 (HGNC:23227): (potassium channel tetramerization domain containing 4) Predicted to be involved in protein homooligomerization. [provided by Alliance of Genome Resources, Apr 2022]

KCTD4 links:

GTF2F2 (HGNC:4653): (general transcription factor IIF subunit 2) Predicted to enable RNA polymerase II general transcription initiation factor activity. Involved in transcription by RNA polymerase II. Located in microtubule cytoskeleton and nucleoplasm. Part of transcription preinitiation complex. [provided by Alliance of Genome Resources, Apr 2022]

GTF2F2 links:

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ACMG classification

Classification made for transcript

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
KCTD4	NM_198404.3 link	c.512G>A	p.Arg171His	missense_variant	Exon 2 of 2	ENST00000379108.2	NP_940686.2	Q8WVF5
GTF2F2	NM_004128.3 link	c.305-13368C>T		intron_variant	Intron 4 of 7	ENST00000340473.8	NP_004119.1	P13984A0A024RDU9
GTF2F2	XM_011535052.4 link	c.382+10578C>T		intron_variant	Intron 5 of 8		XP_011533354.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
KCTD4	ENST00000379108.2 link	c.512G>A	p.Arg171His	missense_variant	Exon 2 of 2	6	NM_198404.3	ENSP00000368402.1	Q8WVF5
GTF2F2	ENST00000340473.8 link	c.305-13368C>T		intron_variant	Intron 4 of 7	1	NM_004128.3	ENSP00000340823.6	P13984
GTF2F2	ENST00000706694.1 link	n.134-13368C>T		intron_variant	Intron 1 of 5			ENSP00000516507.1	A0A9L9PX76

Frequencies

GnomAD3 genomes

Cov.:

GnomAD3 exomes

AF:

0.00000797

AC:

AN:

250848

Hom.:

AF XY:

0.0000148

AC XY:

AN XY:

135542

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000177

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000150

AC:

AN:

1461808

Hom.:

Cov.:

AF XY:

0.00000963

AC XY:

AN XY:

727214

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.0000232

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000144

Gnomad4 OTH exome

AF:

0.0000662

GnomAD4 genome

Cov.:

Alfa

AF:

0.0000312

Hom.:

EpiCase

AF:

0.00

EpiControl

AF:

0.0000593

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Sep 20, 2023

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.512G>A (p.R171H) alteration is located in exon 2 (coding exon 1) of the KCTD4 gene. This alteration results from a G to A substitution at nucleotide position 512, causing the arginine (R) at amino acid position 171 to be replaced by a histidine (H). 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

Pathogenic

0.64

BayesDel_addAF

Pathogenic

0.18

BayesDel_noAF

Uncertain

0.030

CADD

Pathogenic

DANN

Pathogenic

1.0

DEOGEN2

Benign

0.055

Eigen

Pathogenic

0.70

Eigen_PC

Pathogenic

0.76

FATHMM_MKL

Uncertain

0.94

LIST_S2

Uncertain

0.90

M_CAP

Benign

0.020

MetaRNN

Uncertain

0.66

MetaSVM

Benign

-0.64

MutationAssessor

Benign

0.0

PrimateAI

Uncertain

0.79

PROVEAN

Benign

-0.91

REVEL

Uncertain

0.34

Sift

Uncertain

0.0020

Sift4G

Uncertain

0.0050

Polyphen

1.0

Vest4

0.56

MutPred

0.55

Gain of catalytic residue at K169 (P = 0);

MVP

0.92

ClinPred

0.94

GERP RS

5.9

Varity_R

0.48

gMVP

0.86

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

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