Variant chr21-45480419-C-T details in Genebe, Genetics Data Aggregator

Variant summary

Our verdict is Likely benign. Variant got -4 ACMG points: 0P and 4B. BP4_Strong

The NM_001379500.1(COL18A1):c.1399-48C>T variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00013 in 1,613,610 control chromosomes in the GnomAD database, including 1 homozygotes. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

Frequency

Genomes: 𝑓 0.00066 ( 1 hom., cov: 33)

Exomes 𝑓: 0.000074 ( 0 hom. )

Consequence

COL18A1
NM_001379500.1 intron

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: -3.00

Variant links:

Genes affected

COL18A1 (HGNC:2195): (collagen type XVIII alpha 1 chain) This gene encodes the alpha chain of type XVIII collagen. This collagen is one of the multiplexins, extracellular matrix proteins that contain multiple triple-helix domains (collagenous domains) interrupted by non-collagenous domains. A long isoform of the protein has an N-terminal domain that is homologous to the extracellular part of frizzled receptors. Proteolytic processing at several endogenous cleavage sites in the C-terminal domain results in production of endostatin, a potent antiangiogenic protein that is able to inhibit angiogenesis and tumor growth. Mutations in this gene are associated with Knobloch syndrome. The main features of this syndrome involve retinal abnormalities, so type XVIII collagen may play an important role in retinal structure and in neural tube closure. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Dec 2014]

COL18A1 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -4 ACMG points.

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.9).

Transcripts

RefSeq

Gene	Transcript	HGVSc	Effect	MANE	Protein	UniProt
COL18A1	NM_001379500.1 linkuse as main transcript	c.1399-48C>T	intron_variant	ENST00000651438.1	NP_001366429.1
COL18A1	NM_130444.3 linkuse as main transcript	c.2644-48C>T	intron_variant		NP_569711.2	P39060
COL18A1	NM_030582.4 linkuse as main transcript	c.1939-48C>T	intron_variant		NP_085059.2	P39060D3DSM5

Ensembl

Gene	Transcript	HGVSc	Effect	TSL	MANE	Protein	UniProt
COL18A1	ENST00000651438.1 linkuse as main transcript	c.1399-48C>T	intron_variant		NM_001379500.1	ENSP00000498485.1	P39060-2
COL18A1	ENST00000355480.10 linkuse as main transcript	c.1939-48C>T	intron_variant	1		ENSP00000347665.5	P39060-1
COL18A1	ENST00000359759.8 linkuse as main transcript	c.2644-48C>T	intron_variant	5		ENSP00000352798.4	P39060-3

Frequencies

GnomAD3 genomes

AF:

0.000664

AC:

101

AN:

152088

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00237

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:

0.000478

GnomAD3 exomes

AF:

0.000197

AC:

AN:

248366

Hom.:

AF XY:

0.000156

AC XY:

AN XY:

134900

show subpopulations

Gnomad AFR exome

AF:

0.00273

Gnomad AMR exome

AF:

0.000174

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.0000328

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000739

AC:

108

AN:

1461404

Hom.:

Cov.:

AF XY:

0.0000660

AC XY:

AN XY:

726996

show subpopulations

Gnomad4 AFR exome

AF:

0.00224

Gnomad4 AMR exome

AF:

0.000201

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.0000580

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00000540

Gnomad4 OTH exome

AF:

0.000199

GnomAD4 genome

AF:

0.000664

AC:

101

AN:

152206

Hom.:

Cov.:

AF XY:

0.000497

AC XY:

AN XY:

74398

show subpopulations

Gnomad4 AFR

AF:

0.00236

Gnomad4 AMR

AF:

0.000131

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.000473

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.90

CADD

Benign

1.0

DANN

Benign

0.93

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.1

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

Publications

LitVar

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Computational scores

Splicing

Publications

LitVar

Other links and lift over