Genetic Variant KCTD8:p.Glu254Lys (chr4-44447764-C-T) – ACMG Classification: Uncertain_significance (4 pts)

Variant summary

Our verdict is Uncertain significance. The variant received 4 ACMG points: 4P and 0B. PM2PP3_Moderate

The NM_198353.3(KCTD8):c.760G>A(p.Glu254Lys) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000137 in 1,459,338 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. E254Q) has been classified as Uncertain significance.

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 0.0000014 ( 0 hom. )

Consequence

KCTD8
NM_198353.3 missense

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: 7.86

Publications

0 publications found

Variant links:

Genes affected

KCTD8 (HGNC:22394): (potassium channel tetramerization domain containing 8) Predicted to be involved in regulation of G protein-coupled receptor signaling pathway. Predicted to be located in cell projection; postsynaptic membrane; and presynaptic membrane. Predicted to be integral component of membrane. Predicted to be part of receptor complex. [provided by Alliance of Genome Resources, Apr 2022]

KCTD8 links:

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ACMG classification

Classification was made for transcript

Our verdict: Uncertain_significance. The variant received 4 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

PP3

MetaRNN computational evidence supports a deleterious effect, 0.869

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_198353.3. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	KCTD8	NM_198353.3	MANE Select	c.760G>A	p.Glu254Lys	missense	Exon 1 of 2	NP_938167.1	Q6ZWB6

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
KCTD8	ENST00000360029.4	TSL:1 MANE Select	c.760G>A	p.Glu254Lys	missense	Exon 1 of 2	ENSP00000353129.3	Q6ZWB6
KCTD8	ENST00000903710.1		c.760G>A	p.Glu254Lys	missense	Exon 1 of 3	ENSP00000573769.1
KCTD8	ENST00000954398.1		c.760G>A	p.Glu254Lys	missense	Exon 1 of 3	ENSP00000624457.1

Frequencies

GnomAD3 genomes

Cov.:

GnomAD2 exomes

AF:

0.00000406

AC:

AN:

246302

AF XY:

0.00000749

show subpopulations

Gnomad AFR exome

AF:

0.0000632

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000137

AC:

AN:

1459338

Hom.:

Cov.:

AF XY:

0.00000276

AC XY:

AN XY:

725758

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33444

American (AMR)

AF:

0.00

AC:

AN:

44522

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26058

East Asian (EAS)

AF:

0.0000505

AC:

AN:

39620

South Asian (SAS)

AF:

0.00

AC:

AN:

85724

European-Finnish (FIN)

AF:

0.00

AC:

AN:

52980

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5768

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

1110912

Other (OTH)

AF:

0.00

AC:

AN:

60310

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.500

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome 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

GnomAD4 genome

Cov.:

Alfa

AF:

0.00

Hom.:

Bravo

AF:

0.00000378

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.99

BayesDel_addAF

Uncertain

0.039

BayesDel_noAF

Uncertain

0.0

CADD

Pathogenic

(source)

DANN

Pathogenic

1.0

DEOGEN2

Uncertain

0.53

Eigen

Pathogenic

0.72

Eigen_PC

Uncertain

0.65

FATHMM_MKL

Uncertain

0.90

LIST_S2

Pathogenic

1.0

M_CAP

Benign

0.044

MetaRNN

Pathogenic

0.87

MetaSVM

Benign

-0.29

MutationAssessor

Uncertain

2.7

PhyloP100

7.9

PrimateAI

Pathogenic

0.88

PROVEAN

Uncertain

-3.6

REVEL

Uncertain

0.48

Sift

Uncertain

0.0020

Sift4G

Uncertain

0.0030

Polyphen

1.0

Vest4

0.93

MutPred

0.53

Gain of ubiquitination at E254 (P = 0.0085)

MVP

0.83

ClinPred

0.98

GERP RS

4.1

PromoterAI

0.0060

Neutral

(source)

Varity_R

0.91

gMVP

0.85

Mutation Taster

=33/67

disease causing

(source)

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

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over