rs770525372

Variant names:

• chr2-189005381-T-A
• rs770525372
• NM_000090.4:c.2963T>A

Your query was ambiguous. Multiple possible variants found:

• chr2-189005381-T-A
• chr2-189005381-T-C

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 3P and 3B. PM1 PP2 BP4_Moderate BP6

The NM_000090.4(COL3A1):​c.2963T>A​(p.Leu988His) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000479 in 1,461,786 control chromosomes in the GnomAD database, with no homozygous occurrence. 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. L988V) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000048 (0 hom.)
• Consequence: COL3A1 NM_000090.4 missense
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:2 B:1
• Conservation: PhyloP100: -0.519
• Publications: 0 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: 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)

ENSG00000295704 (HGNC:):

ACMG classification

Our verdict: Uncertain_significance. The variant received 0 ACMG points.

• PM1: In a hotspot region, there are 10 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 13 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=0.12173569).
• BP6: Variant 2-189005381-T-A is Benign according to our data. Variant chr2-189005381-T-A is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 459781.

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.2963T>A	p.Leu988His	missense	Exon 41 of 51	NP_000081.2

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	COL3A1	ENST00000304636.9	TSL:1 MANE Select	c.2963T>A	p.Leu988His	missense	Exon 41 of 51	ENSP00000304408.4
	COL3A1	ENST00000450867.2	TSL:1	c.2864T>A	p.Leu955His	missense	Exon 40 of 50	ENSP00000415346.2
	COL3A1	ENST00000879201.1		c.2954T>A	p.Leu985His	missense	Exon 41 of 51	ENSP00000549260.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD2 exomes AF: 0.00000398 AC: 1 AN: 251452 AF XY: 0.00

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.0000289

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: 0.00000479 AC: 7 AN: 1461786 Hom.: 0 Cov.: 31 AF XY: 0.00000550 AC XY: 4 AN XY: 727198

African (AFR) AF: 0.00 AC: 0 AN: 33480

American (AMR) AF: 0.000157 AC: 7 AN: 44720

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26132

East Asian (EAS) AF: 0.00 AC: 0 AN: 39678

South Asian (SAS) AF: 0.00 AC: 0 AN: 86254

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53416

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5768

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1111952

Other (OTH) AF: 0.00 AC: 0 AN: 60386

GnomAD4 genome Cov.: 32

Alfa AF: 0.00 Hom.: 0

Bravo AF: 0.00000378

ExAC AF: 0.00000824 AC: 1

ClinVar

ClinVar submissions as Germline

Significance: Conflicting classifications of pathogenicity

Revision: criteria provided, conflicting classifications

Pathogenic	VUS	Benign	Condition
-	1	-	Ehlers-Danlos syndrome, type 4 (1)
-	1	-	Ehlers-Danlos syndrome, type 4;C5193040:Polymicrogyria with or without vascular-type Ehlers-Danlos syndrome (1)
-	-	1	Familial thoracic aortic aneurysm and aortic dissection (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.087
BayesDel_addAF	Benign	-0.13	T
BayesDel_noAF	Benign	-0.35
CADD	Benign	12
DANN	Benign	0.87
DEOGEN2	Benign	0.40	T
Eigen	Benign	-0.96
Eigen_PC	Benign	-1.0
FATHMM_MKL	Benign	0.048	N
LIST_S2	Benign	0.56	T
M_CAP	Uncertain	0.13	D
MetaRNN	Benign	0.12	T
MetaSVM	Benign	-0.33	T
MutationAssessor	Uncertain	2.1	M
PhyloP100		-0.52
PrimateAI	Benign	0.34	T
PROVEAN	Benign	0.22	N
REVEL	Benign	0.12
Sift	Benign	0.17	T
Sift4G	Benign	0.10	T
Polyphen		0.20	B
Vest4		0.21
MutPred		0.30		Loss of stability (P = 0.1173)
MVP		0.39
MPC		1.4
ClinPred		0.075	T
GERP RS		-2.0
Varity_R		0.083
gMVP		0.37
Mutation Taster		=96/4	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: rs770525372; hg19: chr2-189870107;