2-188991716-GGCTGCAGTGAGTATA-G

Variant names:

• chr2-188991716-GGCTGCAGTGAGTATA-G
• rs587779425
• NM_000090.4:c.951_951+14delAGTGAGTATAGCTGC

Variant summary

Our verdict is Likely pathogenic. The variant received 9 ACMG points: 9P and 0B. PVS1 PP5

The NM_000090.4(COL3A1):​c.951_951+14delAGTGAGTATAGCTGC​(p.Gly318GlyfsTer1147) variant causes a frameshift, splice donor, splice region, intron change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. It is difficult to determine the true allele frequency of this variant because it is of type DEL_BIG, and the frequency of such variant types in population databases may be underestimated and unreliable. Variant has been reported in ClinVar as Pathogenic (no stars). Variant results in nonsense mediated mRNA decay.

• Frequency: Genomes: not found (cov: 32)
• Consequence: COL3A1 NM_000090.4 frameshift, splice_donor, splice_region, intron
• Clinical Significance: Pathogenic no assertion criteria provided P:1
• Conservation: PhyloP100: 7.26
• 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)

ACMG classification

Our verdict: Likely_pathogenic. The variant received 9 ACMG points.

• PVS1: Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
• PP5: Variant 2-188991716-GGCTGCAGTGAGTATA-G is Pathogenic according to our data. Variant chr2-188991716-GGCTGCAGTGAGTATA-G is described in ClinVar as Pathogenic. ClinVar VariationId is 101111.Status of the report is no_assertion_criteria_provided, 0 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
COL3A1	NM_000090.4	c.951_951+14delAGTGAGTATAGCTGC	p.Gly318GlyfsTer1147	frameshift_variant, splice_donor_variant, splice_region_variant, intron_variant	Exon 13 of 51	ENST00000304636.9	NP_000081.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
COL3A1	ENST00000304636.9	c.946_951+9delGCTGCAGTGAGTATA	p.Ala316_Ala317del	splice_donor_variant, conservative_inframe_deletion, splice_region_variant, intron_variant	Exon 13 of 51	1	NM_000090.4	ENSP00000304408.4
COL3A1	ENST00000450867.2	c.946_951+9delGCTGCAGTGAGTATA	p.Ala316_Ala317del	splice_donor_variant, conservative_inframe_deletion, splice_region_variant, intron_variant	Exon 13 of 50	1		ENSP00000415346.2
COL3A1	ENST00000713745.1	c.946_951+9delGCTGCAGTGAGTATA	p.Ala316_Ala317del	splice_donor_variant, conservative_inframe_deletion, splice_region_variant, intron_variant	Exon 13 of 49			ENSP00000519049.1
COL3A1	ENST00000713744.1	c.946_951+9delGCTGCAGTGAGTATA	p.Ala316_Ala317del	splice_donor_variant, conservative_inframe_deletion, splice_region_variant, intron_variant	Exon 13 of 49			ENSP00000519048.1

Frequencies

GnomAD3 genomes Cov.: 32

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:1

Revision: no assertion criteria provided

Submissions by phenotype

Ehlers-Danlos syndrome, type 4 Pathogenic:1

-

Collagen Diagnostic Laboratory, University of Washington

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
PhyloP100		7.3
Mutation Taster		=8/192	disease causing (ClinVar)

Splicing

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

Other links and lift over

dbSNP: rs587779425; hg19: chr2-189856442;