rs200394946

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 3P and 2B. PM1PP2BP4BS1_Supporting

The NM_000090.4(COL3A1):c.1165A>T(p.Asn389Tyr) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000227 in 1,614,098 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

Frequency

Genomes: 𝑓 0.000059 ( 0 hom., cov: 32)

Exomes 𝑓: 0.00024 ( 0 hom. )

Consequence

COL3A1
NM_000090.4 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:7B:1

Conservation

PhyloP100: 2.19

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 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 1 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, 3 uncertain in NM_000090.4

PP2

Missense variant where missense usually causes diseases, COL3A1

BP4

Computational evidence support a benign effect (MetaRNN=0.38460764).

BS1

Variant frequency is greater than expected in population nfe. gnomad4_exome allele frequency = 0.000244 (357/1461808) while in subpopulation NFE AF= 0.000317 (352/1111944). AF 95% confidence interval is 0.000289. There are 0 homozygotes in gnomad4_exome. There are 170 alleles in male gnomad4_exome subpopulation. Median coverage is 32. This position pass quality control queck. Existence of Clinvar submissions makes me limit the strength of this signal to Supporting

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
COL3A1	NM_000090.4 linkuse as main transcript	c.1165A>T	p.Asn389Tyr	missense_variant	17/51	ENST00000304636.9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
COL3A1	ENST00000304636.9 linkuse as main transcript	c.1165A>T	p.Asn389Tyr	missense_variant	17/51	1	NM_000090.4	P1	P02461-1
COL3A1	ENST00000450867.2 linkuse as main transcript	c.1066A>T	p.Asn356Tyr	missense_variant	16/50	1

Frequencies

GnomAD3 genomes

AF:

0.0000591

AC:

AN:

152172

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000241

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:

0.000118

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.000103

AC:

AN:

251380

Hom.:

AF XY:

0.000103

AC XY:

AN XY:

135866

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.000220

Gnomad OTH exome

AF:

0.000163

GnomAD4 exome

AF:

0.000244

AC:

357

AN:

1461808

Hom.:

Cov.:

AF XY:

0.000234

AC XY:

170

AN XY:

727208

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.000317

Gnomad4 OTH exome

AF:

0.0000828

GnomAD4 genome

AF:

0.0000591

AC:

AN:

152290

Hom.:

Cov.:

AF XY:

0.0000403

AC XY:

AN XY:

74458

show subpopulations

Gnomad4 AFR

AF:

0.0000241

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.000118

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.000112

Hom.:

Bravo

AF:

0.0000604

TwinsUK

AF:

0.000539

AC:

ALSPAC

AF:

0.000259

AC:

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.000233

AC:

ExAC

AF:

0.0000741

AC:

EpiCase

AF:

0.000164

EpiControl

AF:

0.000296

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:7Benign:1

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not provided

Uncertain:2

Uncertain significance, criteria provided, single submitter	clinical testing	Revvity Omics, Revvity	Jun 23, 2021	- -
Uncertain significance, criteria provided, single submitter	clinical testing	GeneDx	Feb 17, 2023	Reported in a female with internal carotid dissection and skin hyperelasticity, whose mother with carotid artery dissection also harbored the same variant (Frank et al., 2015); Reported in an individual with younger-onset small vessel disease (Tan et al., 2019); In silico analysis supports that this missense variant has a deleterious effect on protein structure/function; Occurs in the triple helical domain at the Y position in the canonical Gly-X-Y repeat. Although this variant may have an effect on normal protein folding and function, missense substitution at the Y position is not a common mechanism of disease (HGMD); This variant is associated with the following publications: (PMID: 31719132, 25758994, 34318601, 33974636) -

Ehlers-Danlos syndrome, type 4

Uncertain:2

Uncertain significance, criteria provided, single submitter	clinical testing	Invitae	Jan 27, 2024	This sequence change replaces asparagine, which is neutral and polar, with tyrosine, which is neutral and polar, at codon 389 of the COL3A1 protein (p.Asn389Tyr). This variant is present in population databases (rs200394946, gnomAD 0.02%). This missense change has been observed in individual(s) with clinical features of Ehlers-Danlos syndrome or stroke (PMID: 25758994, 31719132). ClinVar contains an entry for this variant (Variation ID: 199718). 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 with a negative predictive value of 95%. 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. -
Uncertain significance, criteria provided, single submitter	clinical testing	All of Us Research Program, National Institutes of Health	Dec 13, 2023	This missense variant replaces asparagine with tyrosine at codon 389 of the COL3A1 protein. Computational prediction suggests that this variant may not impact protein structure and function (internally defined REVEL score threshold <= 0.5, PMID: 27666373). To our knowledge, functional studies have not been performed for this variant. This variant has been reported in an individual affected with possible vascular Ehlers-Danlos syndrome (PMID: 25758994). This variant has been identified in 28/282770 chromosomes 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. -

Familial thoracic aortic aneurysm and aortic dissection

Uncertain:1Benign:1

Benign, criteria provided, single submitter	clinical testing	Ambry Genetics	Sep 07, 2022	This alteration is classified as benign based on a combination of the following: seen in unaffected individuals, population frequency, intact protein function, lack of segregation with disease, co-occurrence, RNA analysis, in silico models, amino acid conservation, lack of disease association in case-control studies, and/or the mechanism of disease or impacted region is inconsistent with a known cause of pathogenicity. -
Uncertain significance, criteria provided, single submitter	clinical testing	Color Diagnostics, LLC DBA Color Health	Dec 20, 2022	This missense variant replaces asparagine with tyrosine at codon 389 of the COL3A1 protein. Computational prediction suggests that this variant may not impact protein structure and function (internally defined REVEL score threshold <= 0.5, PMID: 27666373). To our knowledge, functional studies have not been performed for this variant. This variant has been reported in an individual affected with possible vascular Ehlers-Danlos syndrome (PMID: 25758994). This variant has been identified in 28/282770 chromosomes 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. -

Ehlers-Danlos syndrome, type 4;C5193040:Polymicrogyria with or without vascular-type Ehlers-Danlos syndrome

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Fulgent Genetics, Fulgent Genetics

Aug 20, 2021

- -

COL3A1-related disorder

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

PreventionGenetics, part of Exact Sciences

Jan 22, 2024

The COL3A1 c.1165A>T variant is predicted to result in the amino acid substitution p.Asn389Tyr. This variant has been reported in an individual with possible classical Ehlers-Danlos syndrome (Supplementary results 2, Group 3 and Supplementary Table 4c, Frank et al 2015. PubMed ID: 25758994). This variant was also reported in a study analyzing the frequency of variants identified in small vessel disease (SVD) associated genes in individuals with younger-onset apparently sporadic SVD stroke (Tan et al. 2019. PubMed ID: 31719132) and in a study of individuals with Chiari malformation type 1 (Reported as rs200394946, Table S5, Urbizu et al. 2021. PubMed ID: 33974636). This variant is reported in 0.021% of alleles in individuals of European (Non-Finnish) descent in gnomAD. At this time, the clinical significance of this variant is uncertain due to the absence of conclusive functional and genetic evidence. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.19

BayesDel_addAF

Benign

-0.12

BayesDel_noAF

Benign

-0.13

Cadd

Benign

Dann

Benign

0.95

DEOGEN2

Pathogenic

0.94

D;.

Eigen

Benign

-0.12

Eigen_PC

Benign

-0.15

FATHMM_MKL

Uncertain

0.92

LIST_S2

Benign

0.85

D;T

M_CAP

Benign

0.081

MetaRNN

Benign

0.38

T;T

MetaSVM

Benign

-1.0

MutationAssessor

Benign

1.7

L;L

MutationTaster

Benign

1.0

N;N

PrimateAI

Uncertain

0.48

PROVEAN

Uncertain

-4.1

D;D

REVEL

Benign

0.28

Sift

Uncertain

0.0020

D;D

Sift4G

Uncertain

0.0030

D;D

Polyphen

0.60

P;.

Vest4

0.42

MVP

0.80

MPC

0.77

ClinPred

0.18

GERP RS

3.5

Varity_R

0.16

gMVP

0.68

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

Publications

LitVar

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

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over