chr21-45487495-G-A

Position:

chr21-45487495-G-A

Variant summary

Our verdict is Likely benign. Variant got -5 ACMG points: 0P and 5B. BP4_StrongBP6

The NM_001379500.1(COL18A1):c.1882G>A(p.Ala628Thr) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000126 in 1,613,016 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 13/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

Frequency

Genomes: 𝑓 0.00064 ( 0 hom., cov: 33)

Exomes 𝑓: 0.000073 ( 0 hom. )

Consequence

COL18A1
NM_001379500.1 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:1B:1

Conservation

PhyloP100: -0.794

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 -5 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.0064424574).

BP6

Variant 21-45487495-G-A is Benign according to our data. Variant chr21-45487495-G-A is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 447116.We mark this variant Likely_benign, oryginal submissions are: {Likely_benign=1, Uncertain_significance=1}.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein
COL18A1	NM_001379500.1 linkuse as main transcript	c.1882G>A	p.Ala628Thr	missense_variant	17/42	ENST00000651438.1	NP_001366429.1
COL18A1	NM_130444.3 linkuse as main transcript	c.3127G>A	p.Ala1043Thr	missense_variant	16/41		NP_569711.2
COL18A1	NM_030582.4 linkuse as main transcript	c.2422G>A	p.Ala808Thr	missense_variant	16/41		NP_085059.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
COL18A1	ENST00000651438.1 linkuse as main transcript	c.1882G>A	p.Ala628Thr	missense_variant	17/42		NM_001379500.1	ENSP00000498485		P39060-2
COL18A1	ENST00000355480.10 linkuse as main transcript	c.2422G>A	p.Ala808Thr	missense_variant	16/41	1		ENSP00000347665		P39060-1
COL18A1	ENST00000359759.8 linkuse as main transcript	c.3127G>A	p.Ala1043Thr	missense_variant	16/41	5		ENSP00000352798	P1	P39060-3

Frequencies

GnomAD3 genomes

AF:

0.000637

AC:

AN:

152214

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00220

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000327

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:

0.000161

AC:

AN:

248590

Hom.:

AF XY:

0.000126

AC XY:

AN XY:

135108

show subpopulations

Gnomad AFR exome

AF:

0.00207

Gnomad AMR exome

AF:

0.000145

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.0000327

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000177

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000726

AC:

106

AN:

1460684

Hom.:

Cov.:

AF XY:

0.0000606

AC XY:

AN XY:

726640

show subpopulations

Gnomad4 AFR exome

AF:

0.00191

Gnomad4 AMR exome

AF:

0.0000671

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.0000232

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000279

Gnomad4 OTH exome

AF:

0.0000994

GnomAD4 genome

AF:

0.000637

AC:

AN:

152332

Hom.:

Cov.:

AF XY:

0.000470

AC XY:

AN XY:

74500

show subpopulations

Gnomad4 AFR

AF:

0.00219

Gnomad4 AMR

AF:

0.000327

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

Alfa

AF:

0.000292

Hom.:

Bravo

AF:

0.000703

ESP6500AA

AF:

0.00172

AC:

ESP6500EA

AF:

0.00

AC:

ExAC

AF:

0.000190

AC:

EpiCase

AF:

0.0000545

EpiControl

AF:

0.0000593

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:1Benign:1

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Athena Diagnostics

May 08, 2017

- -

not provided

Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jan 25, 2024

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.072

BayesDel_addAF

Benign

-0.41

BayesDel_noAF

Benign

-0.37

CADD

Benign

DANN

Uncertain

0.98

DEOGEN2

Benign

0.096

.;.;T

Eigen

Benign

-1.4

Eigen_PC

Benign

-1.4

FATHMM_MKL

Benign

0.024

LIST_S2

Benign

0.52

T;T;T

M_CAP

Pathogenic

0.30

MetaRNN

Benign

0.0064

T;T;T

MetaSVM

Benign

-0.29

MutationAssessor

Benign

1.2

.;.;L

MutationTaster

Benign

1.0

N;N;N

PrimateAI

Uncertain

0.59

PROVEAN

Benign

-1.4

N;N;N

REVEL

Benign

0.14

Sift

Benign

0.14

T;T;T

Sift4G

Benign

0.39

T;T;T

Polyphen

0.17

B;B;B

Vest4

0.20

MVP

0.69

MPC

0.27

ClinPred

0.014

GERP RS

-2.8

RBP_binding_hub_radar

1.1

RBP_regulation_power_radar

2.8

Varity_R

0.019

gMVP

0.19

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

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over