2-188974511-G-A

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 3P and 2B. PM2PP2BP4_Moderate

The NM_000090.4(COL3A1):​c.22G>A​(p.Gly8Arg) 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 benign outcome for this variant. 12/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: not found (cov: 31)

Consequence

COL3A1
NM_000090.4 missense

Scores

5
14

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 3.22
Variant links:
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]

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ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 1 ACMG points.

PM2
Very rare variant in population databases, with high coverage;
PP2
Missense variant in the COL3A1 gene, where missense mutations are typically associated with disease (based on misZ statistic). The gene has 495 curated pathogenic missense variants (we use a threshold of 10). The gene has 19 curated benign missense variants. Gene score misZ: 4.0879 (above the threshold of 3.09). Trascript score misZ: 4.5995 (above the threshold of 3.09). GenCC associations: The gene is linked to Ehlers-Danlos syndrome, vascular type, autosomal dominant Ehlers-Danlos syndrome, vascular type, polymicrogyria with or without vascular-type Ehlers-Danlos syndrome.
BP4
Computational evidence support a benign effect (MetaRNN=0.2061784).

Transcripts

RefSeq

Gene Transcript HGVSc HGVSp Effect Exon rank MANE Protein UniProt
COL3A1NM_000090.4 linkc.22G>A p.Gly8Arg missense_variant Exon 1 of 51 ENST00000304636.9 NP_000081.2 P02461-1
LOC105373791XR_007087614.1 linkn.110-4032C>T intron_variant Intron 1 of 2

Ensembl

Gene Transcript HGVSc HGVSp Effect Exon rank TSL MANE Protein Appris UniProt
COL3A1ENST00000304636.9 linkc.22G>A p.Gly8Arg missense_variant Exon 1 of 51 1 NM_000090.4 ENSP00000304408.4 P02461-1
COL3A1ENST00000450867.2 linkc.22G>A p.Gly8Arg missense_variant Exon 1 of 50 1 ENSP00000415346.2 H7C435
COL3A1ENST00000470167.1 linkn.118G>A non_coding_transcript_exon_variant Exon 1 of 2 2

Frequencies

GnomAD3 genomes
Cov.:
31
GnomAD4 exome
Cov.:
30
GnomAD4 genome
Cov.:
31

ClinVar

Significance: Uncertain significance
Submissions summary: Uncertain:1
Revision: criteria provided, single submitter
LINK: link

Submissions by phenotype

Ehlers-Danlos syndrome, type 4 Uncertain:1
Jun 20, 2022
Labcorp Genetics (formerly Invitae), Labcorp
Significance: Uncertain significance
Review Status: criteria provided, single submitter
Collection Method: clinical testing

This sequence change replaces glycine, which is neutral and non-polar, with arginine, which is basic and polar, at codon 8 of the COL3A1 protein (p.Gly8Arg). This variant is not present in population databases (gnomAD no frequency). This variant has not been reported in the literature in individuals affected with COL3A1-related conditions. 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 not expected to disrupt COL3A1 protein function. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -

Computational scores

Source: dbNSFP v4.3

Name
Calibrated prediction
Score
Prediction
AlphaMissense
Uncertain
0.52
BayesDel_addAF
Uncertain
0.096
D
BayesDel_noAF
Benign
-0.10
CADD
Benign
22
DANN
Uncertain
1.0
DEOGEN2
Benign
0.29
T;.
Eigen
Benign
-0.33
Eigen_PC
Benign
-0.072
FATHMM_MKL
Uncertain
0.77
D
LIST_S2
Benign
0.80
T;T
M_CAP
Benign
0.018
T
MetaRNN
Benign
0.21
T;T
MetaSVM
Benign
-0.82
T
MutationAssessor
Benign
0.55
N;N
PrimateAI
Benign
0.41
T
PROVEAN
Benign
-0.22
N;N
REVEL
Uncertain
0.41
Sift
Benign
0.84
T;T
Sift4G
Benign
1.0
T;T
Polyphen
0.0
B;.
Vest4
0.51
MutPred
0.57
Gain of MoRF binding (P = 0.0199);Gain of MoRF binding (P = 0.0199);
MVP
0.89
MPC
0.75
ClinPred
0.60
D
GERP RS
4.8
Varity_R
0.20
gMVP
0.74

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

Below is the list of publications found by LitVar. It may be empty.

Other links and lift over

dbSNP: rs1687765852; hg19: chr2-189839237; API