rs452020

Variant names:

• chr13-110491755-T-C
• rs452020
• NM_001846.4:c.3455-315T>C

Your query was ambiguous. Multiple possible variants found:

• chr13-110491755-T-C
• chr13-110491755-T-G

Variant summary

Our verdict is Benign. The variant received -14 ACMG points: 0P and 14B. BP4_Strong BP6_Moderate BA1

The NM_001846.4(COL4A2):​c.3455-315T>C variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.991 in 152,274 control chromosomes in the GnomAD database, including 74,811 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Benign (★).

• Frequency: Genomes: 𝑓 0.99 (74811 hom., cov: 33)
• Consequence: COL4A2 NM_001846.4 intron
• Clinical Significance: Benign criteria provided, single submitter B:1
• Conservation: PhyloP100: -1.26
• Publications: 2 publications found

Genes affected

COL4A2 (HGNC:2203): (collagen type IV alpha 2 chain) This gene encodes one of the six subunits of type IV collagen, the major structural component of basement membranes. The C-terminal portion of the protein, known as canstatin, is an inhibitor of angiogenesis and tumor growth. Like the other members of the type IV collagen gene family, this gene is organized in a head-to-head conformation with another type IV collagen gene so that each gene pair shares a common promoter. [provided by RefSeq, Jul 2008]

COL4A2 Gene-Disease associations (from GenCC):

• porencephaly 2

  Inheritance: AD Classification: STRONG, MODERATE Submitted by: Labcorp Genetics (formerly Invitae), Ambry Genetics, G2P
• COL4A1 or COL4A2-related cerebral small vessel disease

  Inheritance: AD Classification: MODERATE Submitted by: Illumina
• familial porencephaly

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Benign. The variant received -14 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.95).
• BP6: Variant 13-110491755-T-C is Benign according to our data. Variant chr13-110491755-T-C is described in ClinVar as [Benign]. Clinvar id is 1175612.Status of the report is criteria_provided_single_submitter, 1 stars.
• BA1: GnomAd4 highest subpopulation (EAS) allele frequency at 95% confidence interval = 0.994 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
COL4A2	NM_001846.4	c.3455-315T>C		intron_variant	Intron 37 of 47	ENST00000360467.7	NP_001837.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
COL4A2	ENST00000360467.7	c.3455-315T>C		intron_variant	Intron 37 of 47	5	NM_001846.4	ENSP00000353654.5

Frequencies

GnomAD3 genomes AF: 0.991 AC: 150825 AN: 152156 Hom.: 74761 Cov.: 33

Gnomad AFR AF: 0.970

Gnomad AMI AF: 1.00

Gnomad AMR AF: 0.996

Gnomad ASJ AF: 1.00

Gnomad EAS AF: 1.00

Gnomad SAS AF: 1.00

Gnomad FIN AF: 1.00

Gnomad MID AF: 1.00

Gnomad NFE AF: 1.00

Gnomad OTH AF: 0.994

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

GnomAD4 genome AF: 0.991 AC: 150933 AN: 152274 Hom.: 74811 Cov.: 33 AF XY: 0.992 AC XY: 73806 AN XY: 74434

African (AFR) AF: 0.970 AC: 40274 AN: 41530

American (AMR) AF: 0.996 AC: 15240 AN: 15300

Ashkenazi Jewish (ASJ) AF: 1.00 AC: 3472 AN: 3472

East Asian (EAS) AF: 1.00 AC: 5176 AN: 5176

South Asian (SAS) AF: 1.00 AC: 4827 AN: 4828

European-Finnish (FIN) AF: 1.00 AC: 10626 AN: 10626

Middle Eastern (MID) AF: 0.997 AC: 293 AN: 294

European-Non Finnish (NFE) AF: 1.00 AC: 68015 AN: 68026

Other (OTH) AF: 0.994 AC: 2098 AN: 2110

Alfa AF: 0.982 Hom.: 10959

Bravo AF: 0.990

Asia WGS AF: 0.998 AC: 3472 AN: 3478

ClinVar

Significance: Benign

Submissions summary: Benign:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Benign:1

Jun 29, 2018

GeneDx

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.95
CADD	Benign	0.90
DANN	Benign	0.32
PhyloP100		-1.3
Mutation Taster		=100/0	polymorphism (auto)

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

Other links and lift over

dbSNP: rs452020; hg19: chr13-111144102;