22-37051778-G-C

Variant summary

Our verdict is Likely benign. Variant got -5 ACMG points: 2P and 7B. PM2 BP4_Strong BP6_Moderate BP7

The NM_001282684.2(KCTD17):c.18G>C(p.Gly6=) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000182 in 1,096,240 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 Likely benign (★).

• Frequency:
  • Genomes: not found (cov: 31)
  • Exomes 𝑓: 0.0000018 (0 hom.)
• Consequence: KCTD17 NM_001282684.2 synonymous
• Clinical Significance: Likely benign criteria provided, single submitter B:1
• Conservation: PhyloP100: -0.143

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]

ACMG classification

Verdict is Likely_benign. Variant got -5 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.63).
• BP6: Variant 22-37051778-G-C is Benign according to our data. Variant chr22-37051778-G-C is described in ClinVar as [Likely_benign]. Clinvar id is 2178443.Status of the report is criteria_provided_single_submitter, 1 stars.
• BP7: Synonymous conserved (PhyloP=-0.143 with no splicing effect.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
KCTD17	NM_001282684.2	c.18G>C	p.Gly6=	synonymous_variant	1/9	ENST00000403888.8

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
KCTD17	ENST00000403888.8	c.18G>C	p.Gly6=	synonymous_variant	1/9	1	NM_001282684.2	A2
KCTD17	ENST00000402077.8	c.18G>C	p.Gly6=	synonymous_variant	1/8	1		A2
KCTD17	ENST00000610767.5	c.18G>C	p.Gly6=	synonymous_variant	1/6	3		P2

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome AF: 0.00000182 AC: 2 AN: 1096240 Hom.: 0 Cov.: 31 AF XY: 0.00000191 AC XY: 1 AN XY: 523248

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: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000215

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 31

Bravo AF: 0.00000378

ClinVar

Significance: Likely benign

Submissions summary: Benign:1

Revision: criteria provided, single submitter

Submissions by phenotype

Myoclonic dystonia 26 Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Invitae

Sep 24, 2022

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.63
Cadd	Benign	10
Dann	Benign	0.59
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		2.6

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: rs1924502494; hg19: chr22-37447818;