rs41264443

chr2-189005473-T-G

Variant summary

Our verdict is Benign. Variant got -16 ACMG points: 0P and 16B. BP4_Strong BP6_Very_Strong BS1

The NM_000090.4(COL3A1):c.3039+16T>G variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000786 in 1,591,614 control chromosomes in the GnomAD database, including 2 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★).

• Frequency:
  • Genomes: 𝑓 0.0024 (0 hom., cov: 32)
  • Exomes 𝑓: 0.00061 (2 hom.)
• Consequence: COL3A1 NM_000090.4 intron
• Clinical Significance: Benign/Likely benign criteria provided, multiple submitters, no conflicts B:5
• Conservation: PhyloP100: -0.974

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 Benign. Variant got -16 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.84).
• BP6: Variant 2-189005473-T-G is Benign according to our data. Variant chr2-189005473-T-G is described in ClinVar as [Likely_benign]. Clinvar id is 136855.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr2-189005473-T-G is described in Lovd as [Benign].
• BS1: Variant frequency is greater than expected in population afr. gnomad4 allele frequency = 0.00244 (372/152342) while in subpopulation AFR AF= 0.00726 (302/41584). AF 95% confidence interval is 0.00659. There are 0 homozygotes in gnomad4. There are 167 alleles in male gnomad4 subpopulation. Median coverage is 32. This position pass quality control queck.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
COL3A1	NM_000090.4	c.3039+16T>G		intron_variant		ENST00000304636.9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
COL3A1	ENST00000304636.9	c.3039+16T>G		intron_variant		1	NM_000090.4	P1
COL3A1	ENST00000450867.2	c.2940+16T>G		intron_variant		1

Frequencies

GnomAD3 genomes AF: 0.00244 AC: 371 AN: 152224 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.00726

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00150

Gnomad ASJ AF: 0.00606

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.000207

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00316

Gnomad NFE AF: 0.000220

Gnomad OTH AF: 0.00430

GnomAD3 exomes AF: 0.00109 AC: 275 AN: 251170 Hom.: 0 AF XY: 0.000847 AC XY: 115 AN XY: 135780

Gnomad AFR exome AF: 0.00716

Gnomad AMR exome AF: 0.00168

Gnomad ASJ exome AF: 0.00427

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.000370

Gnomad OTH exome AF: 0.00261

GnomAD4 exome AF: 0.000611 AC: 879 AN: 1439272 Hom.: 2 Cov.: 26 AF XY: 0.000582 AC XY: 418 AN XY: 717678

Gnomad4 AFR exome AF: 0.00691

Gnomad4 AMR exome AF: 0.00186

Gnomad4 ASJ exome AF: 0.00454

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.0000466

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.000314

Gnomad4 OTH exome AF: 0.00148

GnomAD4 genome AF: 0.00244 AC: 372 AN: 152342 Hom.: 0 Cov.: 32 AF XY: 0.00224 AC XY: 167 AN XY: 74496

Gnomad4 AFR AF: 0.00726

Gnomad4 AMR AF: 0.00150

Gnomad4 ASJ AF: 0.00606

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.000207

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.000221

Gnomad4 OTH AF: 0.00425

Alfa AF: 0.00179 Hom.: 0

Bravo AF: 0.00279

Asia WGS AF: 0.000289 AC: 1 AN: 3478

ClinVar

Significance: Benign/Likely benign

Submissions summary: Benign:5

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not specified Benign:3

Benign, criteria provided, single submitter	clinical testing	Women's Health and Genetics/Laboratory Corporation of America, LabCorp	Feb 05, 2024	- -
Benign, criteria provided, single submitter	clinical testing	GeneDx	Mar 02, 2014	This variant is considered likely benign or benign based on one or more of the following criteria: it is a conservative change, it occurs at a poorly conserved position in the protein, it is predicted to be benign by multiple in silico algorithms, and/or has population frequency not consistent with disease. -
Benign, criteria provided, single submitter	clinical testing	PreventionGenetics, part of Exact Sciences	-	- -

not provided Benign:1

Likely benign, criteria provided, single submitter

clinical testing

ARUP Laboratories, Molecular Genetics and Genomics, ARUP Laboratories

Aug 14, 2023

- -

Ehlers-Danlos syndrome, type 4 Benign:1

Benign, criteria provided, single submitter

clinical testing

Invitae

Jan 22, 2024

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.84
Cadd	Benign	2.8
Dann	Benign	0.79

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.11		Details are displayed if max score is > 0.2

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

Publications

LitVar

Other links and lift over

dbSNP: rs41264443; hg19: chr2-189870199;