NM_000090.4:c.2264C>A

Variant names:

Variant summary

Our verdict is Uncertain significance. The variant received 4 ACMG points: 4P and 0B. PM1PP2PP5

The NM_000090.4(COL3A1):c.2264C>A(p.Pro755Gln) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.0000182 in 1,593,608 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Synonymous variant affecting the same amino acid position (i.e. P755P) has been classified as Likely benign.

Frequency

Genomes: 𝑓 0.0000066 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000019 ( 0 hom. )

Consequence

COL3A1
NM_000090.4 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:1U:3

Conservation

PhyloP100: 7.82

Publications

0 publications found

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]

COL3A1 Gene-Disease associations (from GenCC):

autosomal dominant Ehlers-Danlos syndrome, vascular type
Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: G2P, PanelApp Australia, Labcorp Genetics (formerly Invitae), Laboratory for Molecular Medicine, Genomics England PanelApp
Ehlers-Danlos syndrome, vascular type
Inheritance: AD Classification: DEFINITIVE, SUPPORTIVE Submitted by: ClinGen, Orphanet
polymicrogyria with or without vascular-type Ehlers-Danlos syndrome
Inheritance: AR Classification: STRONG Submitted by: PanelApp Australia, Labcorp Genetics (formerly Invitae)

COL3A1 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Uncertain_significance. The variant received 4 ACMG points.

PM1

In a hotspot region, there are 12 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 3 benign, 9 uncertain in NM_000090.4

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, polymicrogyria with or without vascular-type Ehlers-Danlos syndrome, autosomal dominant Ehlers-Danlos syndrome, vascular type.

PP5

Variant 2-188999876-C-A is Pathogenic according to our data. Variant chr2-188999876-C-A is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 529325.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
COL3A1	NM_000090.4 link	c.2264C>A	p.Pro755Gln	missense_variant	Exon 32 of 51	ENST00000304636.9	NP_000081.2	P02461-1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
COL3A1	ENST00000304636.9 link	c.2264C>A	p.Pro755Gln	missense_variant	Exon 32 of 51	1	NM_000090.4	ENSP00000304408.4	P02461-1
COL3A1	ENST00000450867.2 link	c.2165C>A	p.Pro722Gln	missense_variant	Exon 31 of 50	1		ENSP00000415346.2	H7C435
COL3A1	ENST00000713745.1 link	c.2111C>A	p.Pro704Gln	missense_variant	Exon 30 of 49			ENSP00000519049.1
COL3A1	ENST00000713744.1 link	c.2264C>A	p.Pro755Gln	missense_variant	Exon 32 of 49			ENSP00000519048.1

Frequencies

GnomAD3 genomes

AF:

0.00000657

AC:

AN:

152098

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000147

Gnomad OTH

AF:

0.00

GnomAD4 exome

AF:

0.0000194

AC:

AN:

1441510

Hom.:

Cov.:

AF XY:

0.0000154

AC XY:

AN XY:

714538

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33410

American (AMR)

AF:

0.00

AC:

AN:

40212

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

25640

East Asian (EAS)

AF:

0.00

AC:

AN:

39092

South Asian (SAS)

AF:

0.00

AC:

AN:

82286

European-Finnish (FIN)

AF:

0.00

AC:

AN:

52172

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5736

European-Non Finnish (NFE)

AF:

0.0000254

AC:

AN:

1103144

Other (OTH)

AF:

0.00

AC:

AN:

59818

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.479

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.00000657

AC:

AN:

152098

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

74298

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

41428

American (AMR)

AF:

0.00

AC:

AN:

15260

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3470

East Asian (EAS)

AF:

0.00

AC:

AN:

5186

South Asian (SAS)

AF:

0.00

AC:

AN:

4826

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10606

Middle Eastern (MID)

AF:

0.00

AC:

AN:

316

European-Non Finnish (NFE)

AF:

0.0000147

AC:

AN:

68006

Other (OTH)

AF:

0.00

AC:

AN:

2090

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.475

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Alfa

AF:

0.0000370

Hom.:

Bravo

AF:

0.00000756

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Pathogenic:1Uncertain:3

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

Ehlers-Danlos syndrome, type 4

Uncertain:2

Jan 19, 2022

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This sequence change replaces proline, which is neutral and non-polar, with glutamine, which is neutral and polar, at codon 755 of the COL3A1 protein (p.Pro755Gln). 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. ClinVar contains an entry for this variant (Variation ID: 529325). 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. -

Oct 23, 2023

All of Us Research Program, National Institutes of Health

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This missense variant replaces proline with glutamine at codon 755 of the COL3A1 protein. Computational prediction is inconclusive regarding the impact of this variant on protein structure and function (internally defined REVEL score threshold 0.5 < inconclusive < 0.7, PMID: 27666373). To our knowledge, functional studies have not been reported for this variant. This variant has not been reported in individuals affected with cardiovascular disorders in the literature. This variant has not been identified in the general population by the Genome Aggregation Database (gnomAD). The available evidence is insufficient to determine the role of this variant in disease conclusively. Therefore, this variant is classified as a Variant of Uncertain Significance. -

Polymicrogyria with or without vascular-type Ehlers-Danlos syndrome

Pathogenic:1

Mar 28, 2022

Laboratory of Medical Genetics, National & Kapodistrian University of Athens

Significance:Likely pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

PM1, PM2, PP2, PP3 -

Familial thoracic aortic aneurysm and aortic dissection

Uncertain:1

Sep 07, 2023

Color Diagnostics, LLC DBA Color Health

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This missense variant replaces proline with glutamine at codon 755 of the COL3A1 protein. Computational prediction is inconclusive regarding the impact of this variant on protein structure and function (internally defined REVEL score threshold 0.5 < inconclusive < 0.7, PMID: 27666373). To our knowledge, functional studies have not been reported for this variant. This variant has not been reported in individuals affected with COL3A1-related disorders in the literature. This variant has not been identified in the general population by the Genome Aggregation Database (gnomAD). The available evidence is insufficient to determine the role of this variant in disease conclusively. Therefore, this variant is classified as a Variant of Uncertain Significance. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.10

BayesDel_addAF

Uncertain

0.15

BayesDel_noAF

Uncertain

-0.030

CADD

Uncertain

(source)

DANN

Uncertain

0.99

DEOGEN2

Pathogenic

0.86

D;.

Eigen

Pathogenic

0.69

Eigen_PC

Pathogenic

0.68

FATHMM_MKL

Pathogenic

0.99

LIST_S2

Benign

0.84

T;T

M_CAP

Uncertain

0.24

MetaRNN

Uncertain

0.68

D;D

MetaSVM

Uncertain

0.79

MutationAssessor

Benign

1.0

L;L

PhyloP100

7.8

PrimateAI

Uncertain

0.53

PROVEAN

Uncertain

-3.9

D;D

REVEL

Pathogenic

0.68

Sift

Uncertain

0.011

D;D

Sift4G

Uncertain

0.0020

D;D

Polyphen

0.99

D;.

Vest4

0.41

MVP

0.77

MPC

0.58

ClinPred

0.98

GERP RS

5.3

Varity_R

0.22

gMVP

0.47

Mutation Taster

=15/85

disease causing

(source)

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

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over