chr2-20005878-G-A

Variant names:

• chr2-20005878-G-A
• rs28939677
• NM_002381.5:c.656C>T

Variant summary

Our verdict is Likely pathogenic. The variant received 8 ACMG points: 8P and 0B. PM2 PM5 PP3_Strong

The NM_002381.5(MATN3):​c.656C>T​(p.Ala219Val) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. A219D) has been classified as Pathogenic.

• Frequency: Genomes: not found (cov: 33)
• Consequence: MATN3 NM_002381.5 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 9.97
• Publications: 9 publications found

Genes affected

MATN3 (HGNC:6909): (matrilin 3) This gene encodes a member of von Willebrand factor A domain containing protein family. This family of proteins is thought to be involved in the formation of filamentous networks in the extracellular matrices of various tissues. This protein contains two von Willebrand factor A domains; it is present in the cartilage extracellular matrix and has a role in the development and homeostasis of cartilage and bone. Mutations in this gene result in multiple epiphyseal dysplasia. [provided by RefSeq, Jul 2008]

MATN3 Gene-Disease associations (from GenCC):

• multiple epiphyseal dysplasia type 5

  Inheritance: AD Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: G2P, Ambry Genetics, Orphanet, Labcorp Genetics (formerly Invitae)
• spondyloepimetaphyseal dysplasia, matrilin-3 type

  Inheritance: AR, Unknown Classification: SUPPORTIVE, LIMITED Submitted by: Orphanet, Labcorp Genetics (formerly Invitae), Ambry Genetics

ACMG classification

Our verdict: Likely_pathogenic. The variant received 8 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr2-20005878-G-T is described in ClinVar as Pathogenic. ClinVar VariationId is 7543.Status of the report is criteria_provided_single_submitter, 1 stars.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.952

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_002381.5. 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
	MATN3	NM_002381.5	MANE Select	c.656C>T	p.Ala219Val	missense	Exon 2 of 8	NP_002372.1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	MATN3	ENST00000407540.8	TSL:1 MANE Select	c.656C>T	p.Ala219Val	missense	Exon 2 of 8	ENSP00000383894.3
	MATN3	ENST00000421259.2	TSL:1	c.656C>T	p.Ala219Val	missense	Exon 2 of 7	ENSP00000398753.2
	MATN3	ENST00000856777.1		c.656C>T	p.Ala219Val	missense	Exon 2 of 8	ENSP00000526836.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 33

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.43
BayesDel_addAF	Pathogenic	0.40	D
BayesDel_noAF	Pathogenic	0.34
CADD	Uncertain	25
DANN	Pathogenic	1.0
DEOGEN2	Uncertain	0.43	T
Eigen	Pathogenic	0.78
Eigen_PC	Pathogenic	0.71
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Pathogenic	0.99	D
M_CAP	Benign	0.081	D
MetaRNN	Pathogenic	0.95	D
MetaSVM	Uncertain	0.57	D
MutationAssessor	Uncertain	2.4	M
PhyloP100		10
PrimateAI	Uncertain	0.65	T
PROVEAN	Uncertain	-3.5	D
REVEL	Pathogenic	0.79
Sift	Uncertain	0.017	D
Sift4G	Uncertain	0.0020	D
Polyphen		1.0	D
Vest4		0.81
MutPred		0.84		Loss of catalytic residue at A219 (P = 0.1567)
MVP		0.98
MPC		0.72
ClinPred		0.99	D
GERP RS		5.4
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.60
gMVP		0.88
Mutation Taster		=22/78	disease causing

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: rs28939677; hg19: chr2-20205639;