chr20-62830373-CACAAGGCCCTCCCGGAGCCCCTG-C

Position:

• chr20-62830373-CACAAGGCCCTCCCGGAGCCCCTG-C

Variant summary

Our verdict is Pathogenic. Variant got 11 ACMG points: 11P and 0B. PVS1 PM2 PP5

The NM_001853.4(COL9A3):​c.1176_1198del​(p.Gln393CysfsTer25) variant causes a frameshift 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). Variant results in nonsense mediated mRNA decay.

• Frequency: Genomes: not found (cov: 33)
• Consequence: COL9A3 NM_001853.4 frameshift
• Clinical Significance: Pathogenic no assertion criteria provided P:1
• Conservation: PhyloP100: 8.04

Genes affected

COL9A3 (HGNC:2219): (collagen type IX alpha 3 chain) This gene encodes one of the three alpha chains of type IX collagen, the major collagen component of hyaline cartilage. Type IX collagen, a heterotrimeric molecule, is usually found in tissues containing type II collagen, a fibrillar collagen. Mutations in this gene are associated with multiple epiphyseal dysplasia type 3. [provided by RefSeq, Jan 2010]

ACMG classification

Verdict is Pathogenic. Variant got 11 ACMG points.

• PVS1: Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 20-62830373-CACAAGGCCCTCCCGGAGCCCCTG-C is Pathogenic according to our data. Variant chr20-62830373-CACAAGGCCCTCCCGGAGCCCCTG-C is described in ClinVar as [Pathogenic]. Clinvar id is 161450.Status of the report is no_assertion_criteria_provided, 0 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
COL9A3	NM_001853.4	c.1176_1198del	p.Gln393CysfsTer25	frameshift_variant	23/32	ENST00000649368.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
COL9A3	ENST00000649368.1	c.1176_1198del	p.Gln393CysfsTer25	frameshift_variant	23/32		NM_001853.4	P1

Frequencies

GnomAD3 genomes Cov.: 33

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

GnomAD4 genome Cov.: 33

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:1

Revision: no assertion criteria provided

Submissions by phenotype

Stickler syndrome, IIa 6 Pathogenic:1

Pathogenic, no assertion criteria provided

literature only

OMIM

Jan 01, 2014

- -

Computational scores

Source: dbNSFP v4.3

Splicing

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

Publications

LitVar

Other links and lift over

dbSNP: rs606231470; hg19: chr20-61461725;