rs397515511

Variant names:

• chr19-18785676-G-C
• rs397515511
• NM_000095.3:c.1665C>G

Your query was ambiguous. Multiple possible variants found:

• chr19-18785676-G-C
• chr19-18785676-G-T

Variant summary

Our verdict is Pathogenic. The variant received 15 ACMG points: 15P and 0B. PM2 PP2 PP3_Strong PP5_Very_Strong

The NM_000095.3(COMP):​c.1665C>G​(p.Asn555Lys) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (★★). Another nucleotide change resulting in the same amino acid substitution has been previously reported as Uncertain significance in ClinVar.

• Frequency: Genomes: not found (cov: 32)
• Consequence: COMP NM_000095.3 missense
• Clinical Significance: Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:2
• Conservation: PhyloP100: 0.564
• Publications: 0 publications found

Genes affected

COMP (HGNC:2227): (cartilage oligomeric matrix protein) The protein encoded by this gene is a noncollagenous extracellular matrix (ECM) protein. It consists of five identical glycoprotein subunits, each with EGF-like and calcium-binding (thrombospondin-like) domains. Oligomerization results from formation of a five-stranded coiled coil and disulfides. Binding to other ECM proteins such as collagen appears to depend on divalent cations. Contraction or expansion of a 5 aa aspartate repeat and other mutations can cause pseudochondroplasia (PSACH) and multiple epiphyseal dysplasia (MED). [provided by RefSeq, Jul 2016]

COMP Gene-Disease associations (from GenCC):

• multiple epiphyseal dysplasia

  Inheritance: AD Classification: DEFINITIVE Submitted by: ClinGen
• pseudoachondroplasia

  Inheritance: AD, Unknown Classification: DEFINITIVE, STRONG, SUPPORTIVE, LIMITED Submitted by: ClinGen, Orphanet, Labcorp Genetics (formerly Invitae), Illumina
• multiple epiphyseal dysplasia type 1

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

ACMG classification

Our verdict: Pathogenic. The variant received 15 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant in the gene, where a lot of missense mutations are associated with disease in ClinVar. The gene has 127 curated pathogenic missense variants (we use a threshold of 10). The gene has 12 curated benign missense variants. Gene score misZ: 1.78 (below the threshold of 3.09). Trascript score misZ: 1.5018 (below the threshold of 3.09). GenCC associations: The gene is linked to pseudoachondroplasia, multiple epiphyseal dysplasia type 1, multiple epiphyseal dysplasia.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.974
• PP5: Variant 19-18785676-G-C is Pathogenic according to our data. Variant chr19-18785676-G-C is described in ClinVar as [Likely_pathogenic]. Clinvar id is 1709017.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
COMP	NM_000095.3	c.1665C>G	p.Asn555Lys	missense_variant	Exon 14 of 19	ENST00000222271.7	NP_000086.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
COMP	ENST00000222271.7	c.1665C>G	p.Asn555Lys	missense_variant	Exon 14 of 19	1	NM_000095.3	ENSP00000222271.2
COMP	ENST00000542601.6	c.1566C>G	p.Asn522Lys	missense_variant	Exon 13 of 18	1		ENSP00000439156.2
COMP	ENST00000425807.1	c.1506C>G	p.Asn502Lys	missense_variant	Exon 13 of 18	2		ENSP00000403792.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 35

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Pathogenic:1

Mar 01, 2022

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

For these reasons, this variant has been classified as Pathogenic. Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is expected to disrupt COMP protein function. This sequence change replaces asparagine, which is neutral and polar, with lysine, which is basic and polar, at codon 555 of the COMP protein (p.Asn555Lys). This variant is not present in population databases (gnomAD no frequency). This missense change has been observed in individuals with multiple epiphyseal dysplasia (PMID: 15756302; Invitae). -

Multiple epiphyseal dysplasia type 1 Pathogenic:1

Feb 24, 2022

MGZ Medical Genetics Center

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.90
BayesDel_addAF	Uncertain	0.043	T
BayesDel_noAF	Benign	-0.18
CADD	Uncertain	24
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.92	.;D;.
Eigen	Uncertain	0.42
Eigen_PC	Uncertain	0.29
FATHMM_MKL	Uncertain	0.81	D
LIST_S2	Uncertain	0.96	D;D;D
M_CAP	Pathogenic	0.70	D
MetaRNN	Pathogenic	0.97	D;D;D
MetaSVM	Uncertain	0.65	D
MutationAssessor	Uncertain	2.1	.;M;.
PhyloP100		0.56
PrimateAI	Pathogenic	0.83	D
PROVEAN	Pathogenic	-5.5	D;D;D
REVEL	Pathogenic	0.72
Sift	Uncertain	0.0040	D;D;D
Sift4G	Benign	0.10	T;T;T
Polyphen		1.0	.;D;.
Vest4		0.98
MutPred		0.85		.;Gain of methylation at N555 (P = 0.0183);.;
MVP		0.81
ClinPred		0.99	D
GERP RS		1.9
Varity_R		0.92
gMVP		0.88
Mutation Taster		=1/99	disease causing

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		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: rs397515511; hg19: chr19-18896486;