chr6-36470149-A-G

Position:

• chr6-36470149-A-G

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_173562.5(KCTD20):​c.52A>G​(p.Ser18Gly) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. 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 (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: KCTD20 NM_173562.5 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 1.70

Genes affected

KCTD20 (HGNC:21052): (potassium channel tetramerization domain containing 20) Predicted to enable identical protein binding activity. Predicted to be involved in positive regulation of phosphorylation. Predicted to be integral component of membrane. Predicted to be active in cytoplasm. [provided by Alliance of Genome Resources, Apr 2022]

ACMG classification

Verdict is Uncertain_significance. Variant got 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.15893811).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
KCTD20	NM_173562.5	c.52A>G	p.Ser18Gly	missense_variant	2/8	ENST00000373731.7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
KCTD20	ENST00000373731.7	c.52A>G	p.Ser18Gly	missense_variant	2/8	1	NM_173562.5	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD3 exomes AF: 0.00000398 AC: 1 AN: 251376 Hom.: 0 AF XY: 0.00 AC XY: 0 AN XY: 135858

Gnomad AFR exome AF: 0.0000615

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: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

Alfa AF: 0.0000712 Hom.: 0

Bravo AF: 0.00000378

ESP6500AA AF: 0.000227 AC: 1

ESP6500EA AF: 0.00 AC: 0

ExAC AF: 0.00000824 AC: 1

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Apr 26, 2023

The c.52A>G (p.S18G) alteration is located in exon 2 (coding exon 1) of the KCTD20 gene. This alteration results from a A to G substitution at nucleotide position 52, causing the serine (S) at amino acid position 18 to be replaced by a glycine (G). 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	0.064
BayesDel_addAF	Benign	-0.24	T
BayesDel_noAF	Benign	-0.40
CADD	Benign	21
DANN	Uncertain	1.0
DEOGEN2	Benign	0.020	T;.;T;.;T
Eigen	Benign	-0.23
Eigen_PC	Benign	-0.061
FATHMM_MKL	Uncertain	0.88	D
LIST_S2	Benign	0.69	T;T;T;T;T
M_CAP	Benign	0.016	T
MetaRNN	Benign	0.16	T;T;T;T;T
MetaSVM	Benign	-1.1	T
MutationAssessor	Benign	1.0	L;.;.;L;.
MutationTaster	Benign	1.0	D;D;N;N
PrimateAI	Benign	0.33	T
PROVEAN	Benign	-1.1	N;N;N;N;D
REVEL	Benign	0.043
Sift	Pathogenic	0.0	D;D;D;D;D
Sift4G	Uncertain	0.057	T;D;D;D;D
Polyphen		0.043	B;.;.;B;.
Vest4		0.096
MVP		0.47
MPC		0.37
ClinPred		0.43	T
GERP RS		4.2
Varity_R		0.20
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

Other links and lift over

dbSNP: rs376919640; hg19: chr6-36437926;