21-45494528-C-T

Variant summary

Our verdict is Benign. Variant got -10 ACMG points: 0P and 10B. BP4_StrongBP6_ModerateBS2

The NM_001379500.1(COL18A1):c.2353-17C>T variant causes a splice polypyrimidine tract, intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000342 in 1,613,442 control chromosomes in the GnomAD database, including 5 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Benign (★).

Frequency

Genomes: 𝑓 0.0018 ( 2 hom., cov: 34)

Exomes 𝑓: 0.00019 ( 3 hom. )

Consequence

COL18A1
NM_001379500.1 splice_polypyrimidine_tract, intron

Scores

Clinical Significance

Benign criteria provided, single submitter B:1

Conservation

PhyloP100: -0.873

Variant links:

Genes affected

SLC19A1 (HGNC:10937): (solute carrier family 19 member 1) The membrane protein encoded by this gene is a transporter of folate and is involved in the regulation of intracellular concentrations of folate. Three transcript variants encoding different isoforms have been found for this gene.[provided by RefSeq, Mar 2011]

SLC19A1 links:

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 Benign. Variant got -10 ACMG points.

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.87).

BP6

Variant 21-45494528-C-T is Benign according to our data. Variant chr21-45494528-C-T is described in ClinVar as [Benign]. Clinvar id is 1598720.Status of the report is criteria_provided_single_submitter, 1 stars.

BS2

High Homozygotes in GnomAd at 2 AD,AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	Effect	MANE
COL18A1	NM_001379500.1 linkuse as main transcript	c.2353-17C>T	splice_polypyrimidine_tract_variant, intron_variant	ENST00000651438.1
COL18A1	NM_030582.4 linkuse as main transcript	c.2893-17C>T	splice_polypyrimidine_tract_variant, intron_variant
COL18A1	NM_130444.3 linkuse as main transcript	c.3598-17C>T	splice_polypyrimidine_tract_variant, intron_variant

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
COL18A1	ENST00000651438.1 linkuse as main transcript	c.2353-17C>T		splice_polypyrimidine_tract_variant, intron_variant			NM_001379500.1		P39060-2

Frequencies

GnomAD3 genomes

AF:

0.00179

AC:

273

AN:

152226

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00637

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000523

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:

0.000395

AC:

AN:

248310

Hom.:

AF XY:

0.000325

AC XY:

AN XY:

135218

show subpopulations

Gnomad AFR exome

AF:

0.00579

Gnomad AMR exome

AF:

0.000203

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000178

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.000190

AC:

277

AN:

1461098

Hom.:

Cov.:

AF XY:

0.000158

AC XY:

115

AN XY:

726822

show subpopulations

Gnomad4 AFR exome

AF:

0.00729

Gnomad4 AMR exome

AF:

0.000224

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000117

Gnomad4 OTH exome

AF:

0.000149

GnomAD4 genome

AF:

0.00180

AC:

274

AN:

152344

Hom.:

Cov.:

AF XY:

0.00160

AC XY:

119

AN XY:

74496

show subpopulations

Gnomad4 AFR

AF:

0.00637

Gnomad4 AMR

AF:

0.000523

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:

0.000897

Hom.:

Bravo

AF:

0.00184

Asia WGS

AF:

0.000289

AC:

AN:

3478

ClinVar

Significance: Benign

Submissions summary: Benign:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not provided

Benign:1

Benign, criteria provided, single submitter

clinical testing

Invitae

Jan 27, 2024

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.87

Cadd

Benign

1.1

Dann

Benign

0.89

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