COL20A1 p.Ala166Ala

Variant names:

• chr20-63306038-T-T
• ENST00000358894.11:c.

Your query was ambiguous. Multiple possible variants found:

• chr20-63306039--
• chr20-63306041-C-T
• chr20-63306041-C-A
• chr20-63306041-C-G

Variant summary

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

The ENST00000358894.11(COL20A1):​c. variant causes a exon region change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency: Genomes: not found (cov: 31)
• Consequence: COL20A1 ENST00000358894.11 exon_region
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 1.99
• Publications: 0 publications found

Genes affected

COL20A1 (HGNC:14670): (collagen type XX alpha 1 chain) Predicted to be located in endoplasmic reticulum lumen and extracellular region. Predicted to be part of collagen trimer. Predicted to be active in collagen-containing extracellular matrix and extracellular space. [provided by Alliance of Genome Resources, Apr 2022]

COL20A1 Gene-Disease associations (from GenCC):

• hereditary palmoplantar keratoderma

  Inheritance: AD Classification: LIMITED Submitted by: Ambry Genetics

ACMG classification

Our verdict: Uncertain_significance. The variant received 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Variant Effect in Transcripts

ACMG analysis was done for transcript: ENST00000358894.11. 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
There are no transcript annotations for this variant.

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	COL20A1	ENST00000358894.11	TSL:1 MANE Select	c.		exon_region	Exon 5 of 36	ENSP00000351767.6	Q9P218-1
	COL20A1	ENST00000479501.5	TSL:1	n.		exon_region	Exon 5 of 36
	COL20A1	ENST00000894509.1		c.		exon_region	Exon 5 of 37	ENSP00000564568.1

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 31

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
PhyloP100		2.0

Splicing

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

MaxEntScan Visualizer can be used to analyze the impact of this mutation on the neighboring sequence.

Other links and lift over

hg19: chr20-61937390;