chr2-188984799-C-T

Variant names:

• chr2-188984799-C-T
• rs201380807
• NM_000090.4:c.119C>T

Variant summary

Our verdict is Likely benign. The variant received -2 ACMG points: 1P and 3B. PP2 BP4_Moderate BS1_Supporting

The NM_000090.4(COL3A1):​c.119C>T​(p.Ala40Val) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000161 in 1,612,888 control chromosomes in the GnomAD database, including 1 homozygotes. In-silico tool predicts a benign outcome for this variant. 15/22 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. A40G) has been classified as Uncertain significance.

• Frequency:
  • Genomes: 𝑓 0.0000066 (0 hom., cov: 32)
  • Exomes 𝑓: 0.000017 (1 hom.)
• Consequence: COL3A1 NM_000090.4 missense
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:8 B:1
• Conservation: PhyloP100: 1.37
• Publications: 1 publications found

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: Laboratory for Molecular Medicine, Labcorp Genetics (formerly Invitae), G2P, Genomics England PanelApp
• Ehlers-Danlos syndrome, vascular type

  Inheritance: AD Classification: DEFINITIVE, SUPPORTIVE Submitted by: Orphanet, ClinGen
• polymicrogyria with or without vascular-type Ehlers-Danlos syndrome

  Inheritance: AR Classification: STRONG Submitted by: Labcorp Genetics (formerly Invitae)

ENSG00000304419 (HGNC:):

ACMG classification

Our verdict: Likely_benign. The variant received -2 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, polymicrogyria with or without vascular-type Ehlers-Danlos syndrome, autosomal dominant Ehlers-Danlos syndrome, vascular type.
• BP4: Computational evidence support a benign effect (MetaRNN=0.20281777).
• BS1: Variant frequency is greater than expected in population eas. GnomAdExome4 allele frequency = 0.0000171 (25/1461046) while in subpopulation EAS AF = 0.000302 (12/39688). AF 95% confidence interval is 0.000173. There are 1 homozygotes in GnomAdExome4. There are 14 alleles in the male GnomAdExome4 subpopulation. Median coverage is 31. This position passed quality control check. Existence of Clinvar submissions makes me limit the strength of this signal to Supporting

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_000090.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	COL3A1	NM_000090.4	MANE Select	c.119C>T	p.Ala40Val	missense	Exon 2 of 51	NP_000081.2	P02461-1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	COL3A1	ENST00000304636.9	TSL:1 MANE Select	c.119C>T	p.Ala40Val	missense	Exon 2 of 51	ENSP00000304408.4	P02461-1
	COL3A1	ENST00000450867.2	TSL:1	c.119C>T	p.Ala40Val	missense	Exon 2 of 50	ENSP00000415346.2	H7C435
	COL3A1	ENST00000879201.1		c.110C>T	p.Ala37Val	missense	Exon 2 of 51	ENSP00000549260.1

Frequencies

GnomAD3 genomes AF: 0.00000659 AC: 1 AN: 151842 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.000194

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.00

Gnomad OTH AF: 0.00

GnomAD2 exomes AF: 0.0000159 AC: 4 AN: 250932 AF XY: 0.0000295

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.000218

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.0000171 AC: 25 AN: 1461046 Hom.: 1 Cov.: 31 AF XY: 0.0000193 AC XY: 14 AN XY: 726848

African (AFR) AF: 0.00 AC: 0 AN: 33450

American (AMR) AF: 0.00 AC: 0 AN: 44684

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26084

East Asian (EAS) AF: 0.000302 AC: 12 AN: 39688

South Asian (SAS) AF: 0.0000116 AC: 1 AN: 86248

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53408

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5762

European-Non Finnish (NFE) AF: 0.00000900 AC: 10 AN: 1111372

Other (OTH) AF: 0.0000331 AC: 2 AN: 60350

GnomAD4 genome AF: 0.00000659 AC: 1 AN: 151842 Hom.: 0 Cov.: 32 AF XY: 0.0000135 AC XY: 1 AN XY: 74160

African (AFR) AF: 0.00 AC: 0 AN: 41352

American (AMR) AF: 0.00 AC: 0 AN: 15220

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3464

East Asian (EAS) AF: 0.000194 AC: 1 AN: 5160

South Asian (SAS) AF: 0.00 AC: 0 AN: 4820

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10608

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 316

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 67902

Other (OTH) AF: 0.00 AC: 0 AN: 2088

Alfa AF: 0.00 Hom.: 0

Bravo AF: 0.0000113

ExAC AF: 0.0000247 AC: 3

ClinVar

ClinVar submissions

Significance: Conflicting classifications of pathogenicity

Revision: criteria provided, conflicting classifications

Pathogenic	VUS	Benign	Condition
-	2	1	Ehlers-Danlos syndrome, type 4 (3)
-	3	-	not specified (3)
-	1	-	Connective tissue disorder (1)
-	1	-	Familial thoracic aortic aneurysm and aortic dissection (1)
-	1	-	not provided (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.10
BayesDel_addAF	Benign	-0.24	T
BayesDel_noAF	Benign	-0.29
CADD	Benign	21
DANN	Uncertain	1.0
DEOGEN2	Benign	0.18	T
Eigen	Benign	-0.13
Eigen_PC	Benign	-0.092
FATHMM_MKL	Benign	0.71	D
LIST_S2	Benign	0.76	T
M_CAP	Benign	0.038	D
MetaRNN	Benign	0.20	T
MetaSVM	Benign	-0.68	T
MutationAssessor	Uncertain	2.1	M
PhyloP100		1.4
PrimateAI	Benign	0.42	T
PROVEAN	Benign	-1.2	N
REVEL	Benign	0.22
Sift	Benign	0.28	T
Sift4G	Benign	0.29	T
Polyphen		0.73	P
Vest4		0.32
MutPred		0.55		Loss of sheet (P = 0.0315)
MVP		0.63
MPC		0.63
ClinPred		0.30	T
GERP RS		4.0
Varity_R		0.051
gMVP		0.37
Mutation Taster		=75/25	polymorphism

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

Other links and lift over

dbSNP: rs201380807; hg19: chr2-189849525; COSMIC: COSV100483647;