18-26501147-G-T

Variant names:

• chr18-26501147-G-T
• rs587776998
• NM_001142730.3:c.1913C>A

Variant summary

Our verdict is Uncertain significance. The variant received 5 ACMG points: 5P and 0B. PM1 PM2 PP5

The NM_001142730.3(KCTD1):​c.1913C>A​(p.Ala638Glu) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Pathogenic (no stars). Synonymous variant affecting the same amino acid position (i.e. A638A) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 33)
• Consequence: KCTD1 NM_001142730.3 missense
• Clinical Significance: Pathogenic no assertion criteria provided P:2
• Conservation: PhyloP100: 9.50
• Publications: 11 publications found

Genes affected

KCTD1 (HGNC:18249): (potassium channel tetramerization domain containing 1) This gene encodes a protein containing a BTB (Broad-complex, tramtrack and bric a brac), also known as a POZ (POxvirus and zinc finger) protein-protein interaction domain. The encoded protein negatively regulates the AP-2 family of transcription factors and the Wnt signaling pathway. A mechanism for the modulation of Wnt signaling has been proposed in which the encoded protein enhances ubiquitination and degradation of the beta-catenin protein. Mutations in this gene have been identified in Scalp-ear-nipple (SEN) syndrome. [provided by RefSeq, May 2017]

KCTD1 Gene-Disease associations (from GenCC):

• scalp-ear-nipple syndrome

  Inheritance: AD Classification: STRONG, SUPPORTIVE, LIMITED Submitted by: G2P, Orphanet, Labcorp Genetics (formerly Invitae)

ACMG classification

Our verdict: Uncertain_significance. The variant received 5 ACMG points.

• PM1: In a hotspot region, there are 6 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 1 benign, 0 uncertain in NM_001142730.3
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 18-26501147-G-T is Pathogenic according to our data. Variant chr18-26501147-G-T is described in ClinVar as Pathogenic. ClinVar VariationId is 55881.Status of the report is no_assertion_criteria_provided, 0 stars.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001142730.3. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	KCTD1	NM_001142730.3	MANE Select	c.1913C>A	p.Ala638Glu	missense	Exon 2 of 5	NP_001136202.1
	KCTD1	NM_001258222.3		c.113C>A	p.Ala38Glu	missense	Exon 2 of 5	NP_001245151.1
	KCTD1	NM_001136205.2		c.89C>A	p.Ala30Glu	missense	Exon 2 of 5	NP_001129677.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	KCTD1	ENST00000580059.7	TSL:3 MANE Select	c.1913C>A	p.Ala638Glu	missense	Exon 2 of 5	ENSP00000463041.2
	KCTD1	ENST00000408011.7	TSL:1	c.89C>A	p.Ala30Glu	missense	Exon 2 of 5	ENSP00000384367.3
	KCTD1	ENST00000579973.5	TSL:1	c.89C>A	p.Ala30Glu	missense	Exon 3 of 6	ENSP00000464170.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 30

GnomAD4 genome Cov.: 33

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:2

Revision: no assertion criteria provided

Submissions by phenotype

Scalp-ear-nipple syndrome Pathogenic:2

Jan 29, 2014

University of Washington Center for Mendelian Genomics, University of Washington

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: research

Apr 04, 2013

OMIM

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: literature only

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	1.0
BayesDel_addAF	Pathogenic	0.34	D
BayesDel_noAF	Pathogenic	0.24
CADD	Pathogenic	27
DANN	Uncertain	0.99
DEOGEN2	Benign	0.18	T
Eigen	Uncertain	0.58
Eigen_PC	Uncertain	0.64
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Pathogenic	0.99	D
M_CAP	Pathogenic	0.59	D
MetaRNN	Uncertain	0.71	D
MetaSVM	Benign	-0.38	T
MutationAssessor	Uncertain	2.7	M
PhyloP100		9.5
PrimateAI	Pathogenic	0.86	D
PROVEAN	Uncertain	-4.3	D
REVEL	Uncertain	0.55
Sift	Pathogenic	0.0	D
Sift4G	Benign	0.11	T
Polyphen		1.0	D
Vest4		0.90
MutPred		0.37		Gain of disorder (P = 0.0642)
MVP		0.68
MPC		1.7
ClinPred		1.0	D
GERP RS		5.7
Varity_R		0.86
gMVP		0.79
Mutation Taster		=0/100	disease causing (ClinVar)

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

Other links and lift over

dbSNP: rs587776998; hg19: chr18-24081111;