18-26476617-G-A

Variant names:

• chr18-26476617-G-A
• rs878853124
• NM_001142730.3:c.2031C>T

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_001142730.3(KCTD1):​c.2031C>T​(p.Asp677Asp) variant causes a synonymous change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000000684 in 1,461,294 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: KCTD1 NM_001142730.3 synonymous
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 7.70
• Publications: 0 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: Orphanet, G2P, Labcorp Genetics (formerly Invitae)

ACMG classification

Our verdict: Uncertain_significance. The variant received 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.38).

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

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	KCTD1	NM_001142730.3	MANE Select	c.2031C>T	p.Asp677Asp	synonymous	Exon 3 of 5	NP_001136202.1	A0A2U3U043
	KCTD1	NM_001258222.3		c.231C>T	p.Asp77Asp	synonymous	Exon 3 of 5	NP_001245151.1
	KCTD1	NM_001136205.2		c.207C>T	p.Asp69Asp	synonymous	Exon 3 of 5	NP_001129677.1	Q719H9

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	KCTD1	ENST00000580059.7	TSL:3 MANE Select	c.2031C>T	p.Asp677Asp	synonymous	Exon 3 of 5	ENSP00000463041.2	A0A2U3U043
	KCTD1	ENST00000408011.7	TSL:1	c.207C>T	p.Asp69Asp	synonymous	Exon 3 of 5	ENSP00000384367.3	Q719H9
	KCTD1	ENST00000579973.5	TSL:1	c.207C>T	p.Asp69Asp	synonymous	Exon 4 of 6	ENSP00000464170.1	Q719H9

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 6.84e-7 AC: 1 AN: 1461294 Hom.: 0 Cov.: 30 AF XY: 0.00000138 AC XY: 1 AN XY: 726942

African (AFR) AF: 0.00 AC: 0 AN: 33450

American (AMR) AF: 0.00 AC: 0 AN: 44634

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26126

East Asian (EAS) AF: 0.00 AC: 0 AN: 39674

South Asian (SAS) AF: 0.00 AC: 0 AN: 86154

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53410

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5766

European-Non Finnish (NFE) AF: 9.00e-7 AC: 1 AN: 1111704

Other (OTH) AF: 0.00 AC: 0 AN: 60376

GnomAD4 genome Cov.: 33

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.38
CADD	Benign	12
DANN	Benign	0.63
PhyloP100		7.7

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: rs878853124; hg19: chr18-24056581;