chr2-188999318-C-G

Variant names:

Variant summary

Our verdict is Benign. The variant received -13 ACMG points: 3P and 16B. PM1PP2BP4_StrongBP6_Very_StrongBS1

The NM_000090.4(COL3A1):c.2056C>G(p.Pro686Ala) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000245 in 1,589,350 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 17/22 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. P686H) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.0013 ( 0 hom., cov: 32)

Exomes 𝑓: 0.00013 ( 0 hom. )

Consequence

COL3A1
NM_000090.4 missense

Scores

Clinical Significance

Benign/Likely benign criteria provided, multiple submitters, no conflicts B:7

Conservation

PhyloP100: 0.627

Publications

5 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: Benign. The variant received -13 ACMG points.

PM1

In a hotspot region, there are 15 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 1 benign, 11 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.

BP4

Computational evidence support a benign effect (MetaRNN=0.013361037).

BP6

Variant 2-188999318-C-G is Benign according to our data. Variant chr2-188999318-C-G is described in ClinVar as Benign/Likely_benign. ClinVar VariationId is 199698.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

BS1

Variant frequency is greater than expected in population afr. GnomAd4 allele frequency = 0.00133 (203/152276) while in subpopulation AFR AF = 0.00479 (199/41546). AF 95% confidence interval is 0.00424. There are 0 homozygotes in GnomAd4. There are 95 alleles in the male GnomAd4 subpopulation. Median coverage is 32. This position passed quality control check.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
COL3A1	NM_000090.4 link	c.2056C>G	p.Pro686Ala	missense_variant	Exon 30 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.2056C>G	p.Pro686Ala	missense_variant	Exon 30 of 51	1	NM_000090.4	ENSP00000304408.4	P02461-1
COL3A1	ENST00000450867.2 link	c.1957C>G	p.Pro653Ala	missense_variant	Exon 29 of 50	1		ENSP00000415346.2	H7C435
COL3A1	ENST00000713745.1 link	c.1903C>G	p.Pro635Ala	missense_variant	Exon 28 of 49			ENSP00000519049.1
COL3A1	ENST00000713744.1 link	c.2056C>G	p.Pro686Ala	missense_variant	Exon 30 of 49			ENSP00000519048.1

Frequencies

GnomAD3 genomes

AF:

0.00133

AC:

203

AN:

152158

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00480

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.0000655

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:

0.000955

GnomAD2 exomes

AF:

0.000344

AC:

AN:

206110

AF XY:

0.000298

show subpopulations

Gnomad AFR exome

AF:

0.00502

Gnomad AMR exome

AF:

0.000202

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.000130

AC:

187

AN:

1437074

Hom.:

Cov.:

AF XY:

0.000112

AC XY:

AN XY:

712496

show subpopulations

African (AFR)

AF:

0.00494

AC:

163

AN:

32998

American (AMR)

AF:

0.000296

AC:

AN:

40550

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

25578

East Asian (EAS)

AF:

0.00

AC:

AN:

38504

South Asian (SAS)

AF:

0.00

AC:

AN:

83156

European-Finnish (FIN)

AF:

0.00

AC:

AN:

52066

Middle Eastern (MID)

AF:

0.000175

AC:

AN:

5724

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

1099006

Other (OTH)

AF:

0.000185

AC:

AN:

59492

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.469

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:

0.00133

AC:

203

AN:

152276

Hom.:

Cov.:

AF XY:

0.00128

AC XY:

AN XY:

74464

show subpopulations

African (AFR)

AF:

0.00479

AC:

199

AN:

41546

American (AMR)

AF:

0.0000654

AC:

AN:

15282

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3472

East Asian (EAS)

AF:

0.00

AC:

AN:

5182

South Asian (SAS)

AF:

0.00

AC:

AN:

4824

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10620

Middle Eastern (MID)

AF:

0.00

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.0000147

AC:

AN:

68028

Other (OTH)

AF:

0.000945

AC:

AN:

2116

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.497

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome 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

Alfa

AF:

0.000208

Hom.:

Bravo

AF:

0.00147

ESP6500AA

AF:

0.00477

AC:

ESP6500EA

AF:

0.00

AC:

ExAC

AF:

0.000355

AC:

ClinVar

Significance: Benign/Likely benign

Submissions summary: Benign:7

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Familial thoracic aortic aneurysm and aortic dissection

Benign:3

Mar 19, 2018

Ambry Genetics

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This alteration is classified as likely 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. -

Dec 30, 2021

CHEO Genetics Diagnostic Laboratory, Children's Hospital of Eastern Ontario

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Nov 16, 2018

Color Diagnostics, LLC DBA Color Health

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

not provided

Benign:3

Aug 22, 2016

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

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Variant summary: The COL3A1 c.2056C>G (p.Pro686Ala) variant causes a missense change involving a non-conserved nucleotide with 2/3 in silico tools (SNPs&GO and MutationTaster not captured here due to low relability index and p-value, respectively) predict a "benign" outcome, although these predictions have yet to be functionally assessed. The variant of interest was observed in the large, broad control population, ExAC, with an allele frequency of 33/36436 (1/1104), predominantly in the African cohort, 33/3964 (1/120), which significantly exceeds the estimated maximal expected allele frequency for a pathogenic COL3A1 variant of 1/769230. Therefore, suggesting the variant of interest is a common polymorphism found in population(s) of African origin. The variant of interest, to our knowledge, has not been reported in affected individuals via publications, while one reputable clinical laboratory cites the variant as "likely benign." Therefore, the variant of interest has been classified as Benign. -

Aug 04, 2021

GeneDx

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Jan 29, 2021

ARUP Laboratories, Molecular Genetics and Genomics, ARUP Laboratories

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Ehlers-Danlos syndrome, type 4

Benign:1

Jan 19, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.036

BayesDel_addAF

Benign

-0.29

BayesDel_noAF

Benign

-0.19

CADD

Benign

(source)

DANN

Benign

0.95

DEOGEN2

Uncertain

0.47

T;.

Eigen

Benign

-0.58

Eigen_PC

Benign

-0.50

FATHMM_MKL

Benign

0.30

LIST_S2

Uncertain

0.88

D;D

M_CAP

Benign

0.070

MetaRNN

Benign

0.013

T;T

MetaSVM

Uncertain

-0.070

MutationAssessor

Benign

2.0

M;M

PhyloP100

0.63

PrimateAI

Benign

0.41

PROVEAN

Benign

-0.76

N;N

REVEL

Benign

0.24

Sift

Benign

0.46

T;T

Sift4G

Benign

0.53

T;T

Polyphen

0.0

B;.

Vest4

0.26

MVP

0.60

MPC

0.61

ClinPred

0.010

GERP RS

1.9

Varity_R

0.056

gMVP

0.25

Mutation Taster

=84/16

polymorphism

(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

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over