rs587779535

chr2-188996179-G-Achr2-188996179-G-Cchr2-188996179-G-T

Variant summary

Our verdict is Pathogenic. Variant got 16 ACMG points: 16P and 0B. PVS1_Moderate PM2 PP3_Strong PP5_Very_Strong

The NM_000090.4(COL3A1):c.1662+1G>A variant causes a splice donor change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000000684 in 1,461,314 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. 3/3 splice prediction tools predicting alterations to normal splicing. Variant has been reported in ClinVar as Pathogenic (★★).

• Frequency:
  • Genomes: not found (cov: 30)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: COL3A1 NM_000090.4 splice_donor
• Scores: Splicing: ADA: 1.000
• Clinical Significance: Pathogenic criteria provided, multiple submitters, no conflicts P:6
• Conservation: PhyloP100: 9.08

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]

ACMG classification

Verdict is Pathogenic. Variant got 16 ACMG points.

• PVS1: Splicing variant, NOT destroyed by nmd, known LOF gene, truncates exone, which is 0.006021359 fraction of the gene. No cryptic splice site detected. Exon removal is inframe change.
• PM2: Very rare variant in population databases, with high coverage
• PP3: Splicing scoreres supports a deletorius effect: Scorers claiming Pathogenic: dbscSNV1_ADA, dbscSNV1_RF, max_spliceai. No scorers claiming Uncertain. No scorers claiming Benign.
• PP5: Variant 2-188996179-G-A is Pathogenic according to our data. Variant chr2-188996179-G-A is described in ClinVar as [Pathogenic]. Clinvar id is 101269.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr2-188996179-G-A is described in Lovd as [Likely_pathogenic]. Variant chr2-188996179-G-A is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
COL3A1	NM_000090.4	c.1662+1G>A		splice_donor_variant		ENST00000304636.9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
COL3A1	ENST00000304636.9	c.1662+1G>A		splice_donor_variant		1	NM_000090.4	P1
COL3A1	ENST00000450867.2	c.1563+1G>A		splice_donor_variant		1

Frequencies

GnomAD3 genomes Cov.: 30

GnomAD4 exome AF: 6.84e-7 AC: 1 AN: 1461314 Hom.: 0 Cov.: 31 AF XY: 0.00000138 AC XY: 1 AN XY: 727000

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 9.00e-7

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 30

ExAC AF: 0.00000824 AC: 1

EpiCase AF: 0.00

EpiControl AF: 0.0000593

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:6

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Ehlers-Danlos syndrome, type 4 Pathogenic:3

Pathogenic, criteria provided, single submitter	clinical testing	Invitae	Jan 17, 2022	ClinVar contains an entry for this variant (Variation ID: 101269). This variant is also known as IVS24+1G>A. Disruption of this splice site has been observed in individuals with Ehlers-Danlos syndrome (EDS), vascular type (PMID: 8881656, 9399899, 21533953, 25758994). This variant is present in population databases (rs587779535, gnomAD 0.0009%). This sequence change affects a donor splice site in intron 23 of the COL3A1 gene. It is expected to disrupt RNA splicing. Variants that disrupt the donor or acceptor splice site typically lead to a loss of protein function (PMID: 16199547), and loss-of-function variants in COL3A1 are known to be pathogenic (PMID: 24922459). Algorithms developed to predict the effect of sequence changes on RNA splicing suggest that this variant may disrupt the consensus splice site. For these reasons, this variant has been classified as Pathogenic. -
Pathogenic, no assertion criteria provided	clinical testing	Collagen Diagnostic Laboratory, University of Washington	-	- -
Pathogenic, criteria provided, single submitter	clinical testing	3billion	Jan 03, 2022	Canonical splice site: predicted to alter splicing and result in a loss or disruption of normal protein function through protein truncation. Multiple pathogenic variants are reported in the predicted truncated region (PVS1_VS). The variant has been reported at least twice as pathogenic/likely pathogenic with clinical assertions and evidence for the classification (ClinVar ID: VCV000101269). It is observed at an extremely low frequency in the gnomAD v2.1.1 dataset (total allele frequency: 0.000004, PM2_M). Therefore, this variant is classified as pathogenic according to the recommendation of ACMG/AMP guideline. -

not provided Pathogenic:2

Pathogenic, criteria provided, single submitter	clinical testing	CeGaT Center for Human Genetics Tuebingen	Feb 01, 2020	- -
Pathogenic, criteria provided, single submitter	clinical testing	GeneDx	Jun 06, 2017	c.1662+1 G>A: IVS23+1 G>A in intron 23 of the COL3A1 gene (NM_000090.3) The c.1662+1 G>A mutation has been reported multiple times in association with EDS type IV (often reported as IVS24+1 G>A due to alternate nomenclature; Pope et al., 1996; Pepin et al., 2000; Omori et al., 2011; Pepin et al., 2014). This mutation destroys the canonical splice donor site in intron 23 and is predicted to cause abnormal gene splicing. The mutation is predicted to lead to either an abnormal message that is subject to nonsense-mediated mRNA decay, or to an abnormal protein product if the message is used for protein translation. Other splice site mutations in the COL3A1 gene have been reported in association with EDS type IV. Furthermore, the c.1662+1 G>A mutation was not observed in approximately 6,500 individuals of European and African American ancestry in the NHLBI Exome Sequencing Project, indicating it is not a common benign variant in these populations.In summary, c.1662+1 G>A in the COL3A1 gene is interpreted as a disease-causing mutation. The variant is found in TAAD panel(s). -

Familial thoracic aortic aneurysm and aortic dissection Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Ambry Genetics

Jan 12, 2017

The c.1662+1G>A intronic pathogenic mutation results from a G to A substitution one nucleotide after coding exon 23 of the COL3A1 gene. This alteration, previously referred to as IVS 24+1 G>A, has been reported in multiple unrelated individuals with Ehlers-Danlos syndrome and shown to cause exon 23 skipping (Pope FM et al. Br. J. Dermatol., 1996 Aug;135:163-81; Schwarze U et al. Am. J. Hum. Genet., 1997 Dec;61:1276-86; Omori H et al. Surg. Today, 2011 May;41:733-6; Frank M et al. Eur. J. Hum. Genet., 2015 Dec;23:1657-64). In addition to the clinical data presented in the literature, alterations that disrupt the canonical splice site are expected to cause aberrant splicing, resulting in an abnormal protein or a transcript that is subject to nonsense-mediated mRNA decay. As such, this alteration is classified as a disease-causing mutation. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.63	D
BayesDel_noAF	Pathogenic	0.37
Cadd	Pathogenic	30
Dann	Uncertain	0.99
Eigen	Pathogenic	1.1
Eigen_PC	Pathogenic	0.89
FATHMM_MKL	Pathogenic	0.99	D
MutationTaster	Benign	1.0	D;D
GERP RS		5.6

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Pathogenic	1.0
dbscSNV1_RF	Pathogenic	0.92
SpliceAI score (max)		0.97		Details are displayed if max score is > 0.2
DS_DL_spliceai		0.97		Position offset: -1

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Other links and lift over

dbSNP: rs587779535; hg19: chr2-189860905; COSMIC: COSV58589650; COSMIC: COSV58589650;