rs189483688

Variant names:

• chr2-188996502-T-C
• rs189483688
• NM_000090.4:c.1761+6T>C

Variant summary

Our verdict is Likely benign. The variant received -6 ACMG points: 0P and 6B. BP4_Moderate BS1

The NM_000090.4(COL3A1):​c.1761+6T>C variant causes a splice region, intron change. The variant allele was found at a frequency of 0.000018 in 1,610,240 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 2/3 splice prediction tools predict no significant impact on normal splicing. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

• Frequency:
  • Genomes: 𝑓 0.000013 (0 hom., cov: 30)
  • Exomes 𝑓: 0.000019 (0 hom.)
• Consequence: COL3A1 NM_000090.4 splice_region, intron
• Scores: Splicing: ADA: 0.9304
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:6 B:1
• Conservation: PhyloP100: 5.99
• 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: 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)

ACMG classification

Our verdict: Likely_benign. The variant received -6 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.38).
• BS1: Variant frequency is greater than expected in population amr. GnomAdExome4 allele frequency = 0.0000185 (27/1458192) while in subpopulation AMR AF = 0.00047 (21/44684). AF 95% confidence interval is 0.000314. There are 0 homozygotes in GnomAdExome4. There are 9 alleles in the male GnomAdExome4 subpopulation. Median coverage is 30. This position passed quality control check.

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.1761+6T>C		splice_region intron	N/A	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.1761+6T>C		splice_region intron	N/A	ENSP00000304408.4	P02461-1
	COL3A1	ENST00000450867.2	TSL:1	c.1662+6T>C		splice_region intron	N/A	ENSP00000415346.2	H7C435
	COL3A1	ENST00000879201.1		c.1752+6T>C		splice_region intron	N/A	ENSP00000549260.1

Frequencies

GnomAD3 genomes AF: 0.0000132 AC: 2 AN: 151930 Hom.: 0 Cov.: 30

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.000131

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

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: 0.0000719 AC: 18 AN: 250454 AF XY: 0.0000295

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.000464

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: 0.000328

GnomAD4 exome AF: 0.0000185 AC: 27 AN: 1458192 Hom.: 0 Cov.: 30 AF XY: 0.0000124 AC XY: 9 AN XY: 725632

African (AFR) AF: 0.0000300 AC: 1 AN: 33386

American (AMR) AF: 0.000470 AC: 21 AN: 44684

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26098

East Asian (EAS) AF: 0.00 AC: 0 AN: 39658

South Asian (SAS) AF: 0.0000116 AC: 1 AN: 86066

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53346

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5760

European-Non Finnish (NFE) AF: 0.00000180 AC: 2 AN: 1108924

Other (OTH) AF: 0.0000332 AC: 2 AN: 60270

GnomAD4 genome AF: 0.0000132 AC: 2 AN: 152048 Hom.: 0 Cov.: 30 AF XY: 0.00 AC XY: 0 AN XY: 74334

African (AFR) AF: 0.00 AC: 0 AN: 41514

American (AMR) AF: 0.000131 AC: 2 AN: 15266

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3466

East Asian (EAS) AF: 0.00 AC: 0 AN: 5108

South Asian (SAS) AF: 0.00 AC: 0 AN: 4814

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10604

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 294

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 67960

Other (OTH) AF: 0.00 AC: 0 AN: 2110

Alfa AF: 0.0000282 Hom.: 0

Bravo AF: 0.0000302

ClinVar

ClinVar submissions

Significance: Conflicting classifications of pathogenicity

Revision: criteria provided, conflicting classifications

Pathogenic	VUS	Benign	Condition
-	1	1	Familial thoracic aortic aneurysm and aortic dissection (2)
-	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	-	not provided (1)
-	1	-	not specified (1)
-	1	-	Polymicrogyria with or without vascular-type Ehlers-Danlos syndrome (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.38
CADD	Benign	23
DANN	Benign	0.87
PhyloP100		6.0
Mutation Taster		=46/54	disease causing

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Benign	0.93
dbscSNV1_RF	Pathogenic	0.78
Splicevardb		3.0
SpliceAI score (max)		0.13		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: rs189483688; hg19: chr2-189861228;