2-188987116-C-T

Position:

chr2-188987116-C-T

Variant summary

Our verdict is Benign. Variant got -10 ACMG points: 3P and 13B. PM1PP2BP4_StrongBP6BS1BS2

The ENST00000304636.9(COL3A1):c.505C>T(p.Leu169Phe) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000461 in 1,612,698 control chromosomes in the GnomAD database, including 4 homozygotes. 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). Synonymous variant affecting the same amino acid position (i.e. L169L) has been classified as Likely benign.

Frequency

Genomes: 𝑓 0.00058 ( 1 hom., cov: 32)

Exomes 𝑓: 0.00045 ( 3 hom. )

Consequence

COL3A1
ENST00000304636.9 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:2B:9

Conservation

PhyloP100: -6.61

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 Benign. Variant got -10 ACMG points.

PM1

In a hotspot region, there are 2 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 2 benign, 10 uncertain in ENST00000304636.9

PP2

Missense variant in gene, where missense usually causes diseases (based on misZ statistic), COL3A1. . Gene score misZ 4.0879 (greater than the threshold 3.09). Trascript score misZ 4.5995 (greater than threshold 3.09). GenCC has associacion of gene with 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=0.0046863854).

BP6

Variant 2-188987116-C-T is Benign according to our data. Variant chr2-188987116-C-T is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 161216.We mark this variant Likely_benign, oryginal submissions are: {Benign=5, Uncertain_significance=1, Likely_benign=4}.

BS1

Variant frequency is greater than expected in population nfe. gnomad4 allele frequency = 0.000579 (88/152036) while in subpopulation NFE AF= 0.00025 (17/67984). AF 95% confidence interval is 0.000159. There are 1 homozygotes in gnomad4. There are 48 alleles in male gnomad4 subpopulation. Median coverage is 32. This position pass quality control queck.

BS2

High Homozygotes in GnomAdExome4 at 3 AD,AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
COL3A1	NM_000090.4 linkuse as main transcript	c.505C>T	p.Leu169Phe	missense_variant	5/51	ENST00000304636.9	NP_000081.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
COL3A1	ENST00000304636.9 linkuse as main transcript	c.505C>T	p.Leu169Phe	missense_variant	5/51	1	NM_000090.4	ENSP00000304408	P1	P02461-1
COL3A1	ENST00000450867.2 linkuse as main transcript	c.505C>T	p.Leu169Phe	missense_variant	5/50	1		ENSP00000415346

Frequencies

GnomAD3 genomes

AF:

0.000579

AC:

AN:

152036

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.0199

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.000250

Gnomad OTH

AF:

0.000958

GnomAD3 exomes

AF:

0.000805

AC:

202

AN:

251010

Hom.:

AF XY:

0.000818

AC XY:

111

AN XY:

135676

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.0000870

Gnomad ASJ exome

AF:

0.0171

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.000159

Gnomad OTH exome

AF:

0.00147

GnomAD4 exome

AF:

0.000448

AC:

655

AN:

1460662

Hom.:

Cov.:

AF XY:

0.000450

AC XY:

327

AN XY:

726684

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.0000896

Gnomad4 ASJ exome

AF:

0.0184

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000873

Gnomad4 OTH exome

AF:

0.00123

GnomAD4 genome

AF:

0.000579

AC:

AN:

152036

Hom.:

Cov.:

AF XY:

0.000646

AC XY:

AN XY:

74254

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.0199

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.000250

Gnomad4 OTH

AF:

0.000958

Alfa

AF:

0.00101

Hom.:

Bravo

AF:

0.000589

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.000814

AC:

ExAC

AF:

0.000552

AC:

EpiCase

AF:

0.000491

EpiControl

AF:

0.000415

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:2Benign:9

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

Ehlers-Danlos syndrome, type 4

Uncertain:1Benign:2

Likely benign, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Jan 31, 2024	- -
Likely benign, criteria provided, single submitter	clinical testing	Illumina Laboratory Services, Illumina	Apr 26, 2018	This variant was observed as part of a predisposition screen in an ostensibly healthy population. A literature search was performed for the gene, cDNA change, and amino acid change (where applicable). No publications were found based on this search. Allele frequency data from public databases allowed determination this variant is unlikely to cause disease. Therefore, this variant is classified as likely benign. -
Uncertain significance, no assertion criteria provided	clinical testing	Knight Diagnostic Laboratories, Oregon Health and Sciences University	Sep 01, 2015	- -

Familial thoracic aortic aneurysm and aortic dissection

Benign:3

Benign, criteria provided, single submitter	clinical testing	Ambry Genetics	Jun 20, 2015	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. -
Benign, criteria provided, single submitter	clinical testing	CHEO Genetics Diagnostic Laboratory, Children's Hospital of Eastern Ontario	Jun 14, 2018	- -
Benign, criteria provided, single submitter	clinical testing	Color Diagnostics, LLC DBA Color Health	Apr 07, 2018	- -

not specified

Benign:2

Benign, criteria provided, single submitter	clinical testing	GeneDx	Feb 22, 2018	This variant is considered likely benign or benign based on one or more of the following criteria: it is a conservative change, it occurs at a poorly conserved position in the protein, it is predicted to be benign by multiple in silico algorithms, and/or has population frequency not consistent with disease. -
Likely benign, criteria provided, single submitter	clinical testing	Women's Health and Genetics/Laboratory Corporation of America, LabCorp	Oct 23, 2023	Variant summary: COL3A1 c.505C>T (p.Leu169Phe) results in a non-conservative amino acid change in the encoded protein sequence. Four of five in-silico tools predict a benign effect of the variant on protein function. The variant allele was found at a frequency of 0.0008 in 251010 control chromosomes. The observed variant frequency is approximately 640 fold of the estimated maximal expected allele frequency for a pathogenic variant in COL3A1 causing Aortopathy phenotype (1.3e-06), strongly suggesting that the variant is benign. To our knowledge, no occurrence of c.505C>T in individuals affected with Aortopathy and no experimental evidence demonstrating its impact on protein function have been reported. Eight submitters have cited clinical-significance assessments for this variant to ClinVar after 2014 and classified as benign/likely benign (n=7) and VUS (n=1). Based on the evidence outlined above, the variant was classified as likely benign. -

Aortic aneurysm

Uncertain:1

Uncertain significance, criteria provided, single submitter

research

CSER _CC_NCGL, University of Washington

Jun 01, 2014

Low GERP score may suggest that this variant may belong in a lower pathogenicity class -

Ehlers-Danlos syndrome

Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Genome Diagnostics Laboratory, The Hospital for Sick Children

Jan 01, 2020

- -

not provided

Benign:1

Benign, criteria provided, single submitter

clinical testing

CeGaT Center for Human Genetics Tuebingen

Nov 01, 2024

COL3A1: BS1, BS2 -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.069

BayesDel_addAF

Benign

-0.14

BayesDel_noAF

Benign

-0.14

CADD

Benign

0.0020

DANN

Benign

0.90

DEOGEN2

Benign

0.27

T;.

Eigen

Benign

-1.4

Eigen_PC

Benign

-1.5

FATHMM_MKL

Benign

0.076

LIST_S2

Benign

0.14

T;T

M_CAP

Uncertain

0.12

MetaRNN

Benign

0.0047

T;T

MetaSVM

Benign

-0.48

MutationAssessor

Benign

0.73

N;N

MutationTaster

Benign

1.0

N;N

PrimateAI

Benign

0.33

PROVEAN

Benign

-0.34

N;N

REVEL

Uncertain

0.52

Sift

Benign

0.73

T;T

Sift4G

Benign

0.15

T;T

Polyphen

0.074

B;.

Vest4

0.13

MVP

0.96

MPC

0.68

ClinPred

0.026

GERP RS

-6.5

Varity_R

0.029

gMVP

0.41

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