2-188974498-C-A

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 3P and 0B. PM2 PP2

The NM_000090.4(COL3A1):c.9C>A(p.Ser3Arg) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 31)
• Consequence: COL3A1 NM_000090.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 6.86

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]

LOC105373791 (HGNC:):

ACMG classification

Verdict is Uncertain_significance. Variant got 3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant where missense usually causes diseases, COL3A1

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
COL3A1	NM_000090.4	c.9C>A	p.Ser3Arg	missense_variant	1/51	ENST00000304636.9
LOC105373791	XR_007087614.1	n.110-4019G>T		intron_variant, non_coding_transcript_variant

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
COL3A1	ENST00000304636.9	c.9C>A	p.Ser3Arg	missense_variant	1/51	1	NM_000090.4	P1
COL3A1	ENST00000450867.2	c.9C>A	p.Ser3Arg	missense_variant	1/50	1
COL3A1	ENST00000470167.1	n.105C>A		non_coding_transcript_exon_variant	1/2	2

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome Cov.: 30

GnomAD4 genome Cov.: 31

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Familial thoracic aortic aneurysm and aortic dissection Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Feb 02, 2022

The p.S3R variant (also known as c.9C>A), located in coding exon 1 of the COL3A1 gene, results from a C to A substitution at nucleotide position 9. The serine at codon 3 is replaced by arginine, an amino acid with dissimilar properties. This amino acid position is highly conserved in available vertebrate species. In addition, this alteration is predicted to be deleterious by in silico analysis. Since supporting evidence is limited at this time, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.84
BayesDel_addAF	Pathogenic	0.35	D
BayesDel_noAF	Pathogenic	0.27
Cadd	Uncertain	25
Dann	Uncertain	1.0
DEOGEN2	Uncertain	0.45	T;.
Eigen	Uncertain	0.67
Eigen_PC	Pathogenic	0.71
FATHMM_MKL	Uncertain	0.93	D
LIST_S2	Benign	0.76	T;T
M_CAP	Uncertain	0.099	D
MetaRNN	Uncertain	0.47	T;T
MetaSVM	Uncertain	0.71	D
MutationAssessor	Benign	0.81	L;L
MutationTaster	Benign	1.0	D;D
PrimateAI	Uncertain	0.58	T
PROVEAN	Benign	-1.6	N;N
REVEL	Uncertain	0.53
Sift	Benign	0.066	T;D
Sift4G	Uncertain	0.029	D;D
Polyphen		1.0	D;.
Vest4		0.68
MutPred		0.40		Gain of MoRF binding (P = 5e-04);Gain of MoRF binding (P = 5e-04);
MVP		0.92
MPC		0.70
ClinPred		0.85	D
GERP RS		5.7
Varity_R		0.24
gMVP		0.79

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

No publications associated with this variant yet.

Other links and lift over

hg19: chr2-189839224;