rs142045411

Variant names:

Variant summary

Our verdict is Likely benign. Variant got -6 ACMG points: 1P and 7B. PP2BP4_ModerateBP6BS1

The NM_000090.4(COL3A1):c.226A>G(p.Asn76Asp) variant causes a missense change. The variant allele was found at a frequency of 0.000144 in 1,613,104 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 13/21 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 0.00011 ( 0 hom., cov: 32)

Exomes 𝑓: 0.00015 ( 0 hom. )

Consequence

COL3A1
NM_000090.4 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:4B:3

Conservation

PhyloP100: 6.29

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:

LOC105373791 (HGNC:):

LOC105373791 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -6 ACMG points.

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=0.21247405).

BP6

Variant 2-188984906-A-G is Benign according to our data. Variant chr2-188984906-A-G is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 519601.We mark this variant Likely_benign, oryginal submissions are: {Likely_benign=1, Benign=2, Uncertain_significance=4}.

BS1

Variant frequency is greater than expected in population nfe. gnomad4_exome allele frequency = 0.000148 (216/1461140) while in subpopulation NFE AF= 0.000184 (205/1111504). AF 95% confidence interval is 0.000163. There are 0 homozygotes in gnomad4_exome. There are 99 alleles in male gnomad4_exome subpopulation. Median coverage is 31. This position pass quality control queck.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
COL3A1	NM_000090.4 link	c.226A>G	p.Asn76Asp	missense_variant	Exon 2 of 51	ENST00000304636.9	NP_000081.2	P02461-1
LOC105373791	XR_007087614.1 link	n.-87T>C		upstream_gene_variant

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
COL3A1	ENST00000304636.9 link	c.226A>G	p.Asn76Asp	missense_variant	Exon 2 of 51	1	NM_000090.4	ENSP00000304408.4	P02461-1
COL3A1	ENST00000450867.2 link	c.226A>G	p.Asn76Asp	missense_variant	Exon 2 of 50	1		ENSP00000415346.2	H7C435
COL3A1	ENST00000470167.1 link	n.322A>G		non_coding_transcript_exon_variant	Exon 2 of 2	2

Frequencies

GnomAD3 genomes

AF:

0.000105

AC:

AN:

151964

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000121

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.0000656

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:

0.000132

Gnomad OTH

AF:

0.000478

GnomAD3 exomes

AF:

0.0000598

AC:

AN:

250678

Hom.:

AF XY:

0.0000369

AC XY:

AN XY:

135450

show subpopulations

Gnomad AFR exome

AF:

0.0000616

Gnomad AMR exome

AF:

0.0000290

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:

0.000115

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.000148

AC:

216

AN:

1461140

Hom.:

Cov.:

AF XY:

0.000136

AC XY:

AN XY:

726882

show subpopulations

Gnomad4 AFR exome

AF:

0.0000299

Gnomad4 AMR exome

AF:

0.0000224

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:

0.000184

Gnomad4 OTH exome

AF:

0.000149

GnomAD4 genome

AF:

0.000105

AC:

AN:

151964

Hom.:

Cov.:

AF XY:

0.000108

AC XY:

AN XY:

74232

show subpopulations

Gnomad4 AFR

AF:

0.000121

Gnomad4 AMR

AF:

0.0000656

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.000132

Gnomad4 OTH

AF:

0.000478

Alfa

AF:

0.000195

Hom.:

Bravo

AF:

0.000147

TwinsUK

AF:

0.00108

AC:

ALSPAC

AF:

0.000259

AC:

ESP6500AA

AF:

0.000227

AC:

ESP6500EA

AF:

0.000233

AC:

ExAC

AF:

0.0000330

AC:

EpiCase

AF:

0.000382

EpiControl

AF:

0.0000593

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:4Benign:3

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

Ehlers-Danlos syndrome, type 4

Uncertain:2Benign:1

May 30, 2024

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 asparagine with aspartic acid at codon 76 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 reported for this variant. This variant has been reported in an individual affected with lacunar stroke (PMID: 31719132). This variant has been identified in 19/282052 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. -

Jan 12, 2018

Illumina Laboratory Services, Illumina

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score and internal cut-off values, a variant classified as benign is not then subjected to further curation. The score for this variant resulted in a classification of benign for this disease. -

Sep 23, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces asparagine, which is neutral and polar, with aspartic acid, which is acidic and polar, at codon 76 of the COL3A1 protein (p.Asn76Asp). This variant is present in population databases (rs142045411, gnomAD 0.01%). This missense change has been observed in individual(s) with lacunar stroke (PMID: 31719132). ClinVar contains an entry for this variant (Variation ID: 519601). Invitae Evidence Modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) 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. -

Familial thoracic aortic aneurysm and aortic dissection

Uncertain:1Benign:1

Apr 11, 2024

Ambry Genetics

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

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. -

Feb 07, 2024

Color Diagnostics, LLC DBA Color Health

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

not provided

Uncertain:1

Jul 03, 2024

GeneDx

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Reported in an individual with younger-onset small vessel disease (PMID: 31719132); In silico analysis indicates that this missense variant does not alter protein structure/function; Not located in the triple helical region, where the majority of pathogenic missense variants occur (HGMD); This variant is associated with the following publications: (PMID: 38944978, 31719132) -

not specified

Benign:1

Jul 20, 2020

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Variant summary: COL3A1 c.226A>G (p.Asn76Asp) results in a conservative amino acid change located in the von Willebrand factor (VWF) type C domain (IPR001007) of the encoded protein sequence. Four of fvie in-silico tools predict a benign effect of the variant on protein function. The variant allele was found at a frequency of 6.7e-05 in 282052 control chromosomes, predominantly at a frequency of 0.00012 within the Non-Finnish European subpopulation in the gnomAD database. The observed variant frequency within Non-Finnish European control individuals in the gnomAD database is approximately 80-fold of the estimated maximal expected allele frequency for a pathogenic variant in COL3A1 causing Ehlers-Danlos Syndrome, Vascular Type phenotype (1.5e-06), strongly suggesting that the variant is a benign polymorphism found primarily in populations of Non-Finnish European origin. The variant, c.226A>G, has been reported in the literature in an individual affected with lacunar stroke (Tan_2019). This report however, does not provide unequivocal conclusions about association of the variant with Ehlers-Danlos Syndrome, Vascular Type. To our knowledge, no experimental evidence demonstrating an impact on protein function has been reported. Four clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar after 2014 without evidence for independent evaluation, and 3 classified the variant as VUS, while one called it as benign. Based on the evidence outlined above, the variant was classified as likely benign. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.14

BayesDel_addAF

Benign

-0.19

BayesDel_noAF

Benign

-0.31

CADD

Benign

DANN

Uncertain

0.99

DEOGEN2

Benign

0.25

T;.

Eigen

Benign

0.15

Eigen_PC

Benign

0.21

FATHMM_MKL

Uncertain

0.88

LIST_S2

Benign

0.40

T;T

M_CAP

Benign

0.033

MetaRNN

Benign

0.21

T;T

MetaSVM

Benign

-0.73

MutationAssessor

Benign

1.1

L;L

PrimateAI

Uncertain

0.48

PROVEAN

Benign

-1.7

N;N

REVEL

Benign

0.18

Sift

Benign

0.32

T;D

Sift4G

Benign

0.44

T;T

Polyphen

0.82

P;.

Vest4

0.47

MVP

0.65

MPC

0.71

ClinPred

0.13

GERP RS

4.0

Varity_R

0.21

gMVP

0.46

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.

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