rs587779715

Positions:

• chr2-189008089-G-C

Variant summary

Our verdict is Pathogenic. Variant got 19 ACMG points: 19P and 0B. PM1 PM2 PM5 PP2 PP3_Strong PP5_Very_Strong

The NM_000090.4(COL3A1):​c.3472G>C​(p.Gly1158Arg) 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. 12/21 in silico tools predict a damaging outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. G1158D) has been classified as Pathogenic.

• Frequency: Genomes: not found (cov: 32)
• Consequence: COL3A1 NM_000090.4 missense
• Clinical Significance: Likely pathogenic criteria provided, multiple submitters, no conflicts P:3
• Conservation: PhyloP100: 10.0

Genes affected

COL3A1 (HGNC:2201): (collagen type III alpha 1 chain) This gene encodes the pro-alpha1 chains of type III collagen, a fibrillar collagen that is found in extensible connective tissues such as skin, lung, uterus, intestine and the vascular system, frequently in association with type I collagen. Mutations in this gene are associated with Ehlers-Danlos syndrome type IV, and with aortic and arterial aneurysms. [provided by R. Dalgleish, Feb 2008]

ACMG classification

Verdict is Pathogenic. Variant got 19 ACMG points.

• PM1: In a hotspot region, there are 4 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 10 uncertain in NM_000090.4
• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr2-189008090-G-A is described in ClinVar as [Pathogenic]. Clinvar id is 101166.Status of the report is no_assertion_criteria_provided, 0 stars.
• PP2: Missense variant where missense usually causes diseases, COL3A1
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.994
• PP5: Variant 2-189008089-G-C is Pathogenic according to our data. Variant chr2-189008089-G-C is described in ClinVar as [Likely_pathogenic]. Clinvar id is 101484.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
COL3A1	NM_000090.4	c.3472G>C	p.Gly1158Arg	missense_variant	47/51	ENST00000304636.9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
COL3A1	ENST00000304636.9	c.3472G>C	p.Gly1158Arg	missense_variant	47/51	1	NM_000090.4	P1
COL3A1	ENST00000450867.2	c.3373G>C	p.Gly1125Arg	missense_variant	46/50	1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:3

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Loeys-Dietz syndrome Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Molecular Diagnostic Laboratory for Inherited Cardiovascular Disease, Montreal Heart Institute

Sep 22, 2016

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COL3A1-related disorder Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

PreventionGenetics, part of Exact Sciences

Nov 14, 2022

The COL3A1 c.3472G>C variant is predicted to result in the amino acid substitution p.Gly1158Arg. This variant was reported in a study of individuals with vascular Ehlers-Danlos syndrome (EDS type IV) (Supplementary Table S1, Pepin et al. 2014. PubMed ID: 24922459). Of note, another variant impacting this same amino acid was also reported in the same study of individuals with vascular EDS [c.3473G>A (p.Gly1158Asp), Supplementary Table S1, Pepin et al. 2014. PubMed ID: 24922459]. The c.3472G>C variant has not been reported in a large population database (http://gnomad.broadinstitute.org), indicating this variant is rare. The majority of documented causative missense variants in COL3A1 substitute a glycine residue to another amino acid in the Gly-X-Y triple helical domain (Pepin et al. 2014. PubMed ID: 24922459). Taken together, we interpret this variant as likely pathogenic. -

Ehlers-Danlos syndrome, type 4 Pathogenic:1

Pathogenic, no assertion criteria provided

clinical testing

Collagen Diagnostic Laboratory, University of Washington

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Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	1.0
BayesDel_addAF	Pathogenic	0.57	D
BayesDel_noAF	Pathogenic	0.59
CADD	Pathogenic	29
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.96	D;.
Eigen	Pathogenic	1.2
Eigen_PC	Pathogenic	1.1
FATHMM_MKL	Pathogenic	1.0	D
LIST_S2	Pathogenic	0.99	D;D
M_CAP	Pathogenic	0.98	D
MetaRNN	Pathogenic	0.99	D;D
MetaSVM	Pathogenic	0.98	D
MutationAssessor	Pathogenic	4.6	H;.
MutationTaster	Benign	1.0	D;D
PrimateAI	Pathogenic	0.91	D
PROVEAN	Pathogenic	-7.1	D;D
REVEL	Pathogenic	1.0
Sift	Pathogenic	0.0	D;D
Sift4G	Pathogenic	0.0010	D;D
Polyphen		1.0	D;.
Vest4		0.97
MutPred		0.99		Gain of methylation at G1158 (P = 0.0075);.;
MVP		0.98
MPC		0.25
ClinPred		1.0	D
GERP RS		5.5
Varity_R		0.99
gMVP		1.0

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

Publications

LitVar

Other links and lift over

dbSNP: rs587779715; hg19: chr2-189872815;