rs117866003

Variant names:

Variant summary

Our verdict is Benign. The variant received -16 ACMG points: 0P and 16B. BP4_StrongBP6_Very_StrongBS2

The NM_001379500.1(COL18A1):c.3810-20C>T variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00368 in 1,603,690 control chromosomes in the GnomAD database, including 21 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Benign (★★).

Frequency

Genomes: 𝑓 0.0023 ( 1 hom., cov: 33)

Exomes 𝑓: 0.0038 ( 20 hom. )

Consequence

COL18A1
NM_001379500.1 intron

Scores

Clinical Significance

Benign criteria provided, multiple submitters, no conflicts B:4

Conservation

PhyloP100: -2.21

Publications

0 publications found

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:

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:

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ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -16 ACMG points.

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.84).

BP6

Variant 21-45512168-C-T is Benign according to our data. Variant chr21-45512168-C-T is described in ClinVar as Benign. ClinVar VariationId is 261918.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

BS2

High Homozygotes in GnomAdExome4 at 20 AD,AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
COL18A1	NM_001379500.1 link	c.3810-20C>T		intron_variant	Intron 41 of 41	ENST00000651438.1	NP_001366429.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
COL18A1	ENST00000651438.1 link	c.3810-20C>T		intron_variant	Intron 41 of 41		NM_001379500.1	ENSP00000498485.1

Frequencies

GnomAD3 genomes

AF:

0.00231

AC:

351

AN:

152192

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00113

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00190

Gnomad ASJ

AF:

0.000288

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.000207

Gnomad FIN

AF:

0.000377

Gnomad MID

AF:

0.00316

Gnomad NFE

AF:

0.00387

Gnomad OTH

AF:

0.00239

GnomAD2 exomes

AF:

0.00210

AC:

476

AN:

227118

AF XY:

0.00210

show subpopulations

Gnomad AFR exome

AF:

0.00120

Gnomad AMR exome

AF:

0.00227

Gnomad ASJ exome

AF:

0.000208

Gnomad EAS exome

AF:

0.000120

Gnomad FIN exome

AF:

0.000103

Gnomad NFE exome

AF:

0.00358

Gnomad OTH exome

AF:

0.00216

GnomAD4 exome

AF:

0.00382

AC:

5548

AN:

1451380

Hom.:

Cov.:

AF XY:

0.00369

AC XY:

2660

AN XY:

721310

show subpopulations

African (AFR)

AF:

0.000934

AC:

AN:

33176

American (AMR)

AF:

0.00246

AC:

107

AN:

43566

Ashkenazi Jewish (ASJ)

AF:

0.000463

AC:

AN:

25898

East Asian (EAS)

AF:

0.0000769

AC:

AN:

39012

South Asian (SAS)

AF:

0.000354

AC:

AN:

84680

European-Finnish (FIN)

AF:

0.000426

AC:

AN:

51598

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5756

European-Non Finnish (NFE)

AF:

0.00469

AC:

5190

AN:

1107754

Other (OTH)

AF:

0.00255

AC:

153

AN:

59940

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.496

Heterozygous variant carriers

313

626

938

1251

1564

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Exome Hom

Variant carriers

208

416

624

832

1040

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.00230

AC:

351

AN:

152310

Hom.:

Cov.:

AF XY:

0.00213

AC XY:

159

AN XY:

74484

show subpopulations

African (AFR)

AF:

0.00113

AC:

AN:

41568

American (AMR)

AF:

0.00189

AC:

AN:

15308

Ashkenazi Jewish (ASJ)

AF:

0.000288

AC:

AN:

3470

East Asian (EAS)

AF:

0.00

AC:

AN:

5178

South Asian (SAS)

AF:

0.000207

AC:

AN:

4826

European-Finnish (FIN)

AF:

0.000377

AC:

AN:

10622

Middle Eastern (MID)

AF:

0.00340

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.00387

AC:

263

AN:

68022

Other (OTH)

AF:

0.00237

AC:

AN:

2110

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.494

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

Alfa

AF:

0.00176

Hom.:

Bravo

AF:

0.00261

Asia WGS

AF:

0.000577

AC:

AN:

3478

ClinVar

Significance: Benign

Submissions summary: Benign:4

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not specified

Benign:3

Genome Diagnostics Laboratory, Amsterdam University Medical Center

Significance:Benign

Review Status:no assertion criteria provided

Collection Method:clinical testing

- -

PreventionGenetics, part of Exact Sciences

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Clinical Genetics DNA and cytogenetics Diagnostics Lab, Erasmus MC, Erasmus Medical Center

Significance:Benign

Review Status:no assertion criteria provided

Collection Method:clinical testing

- -

not provided

Benign:1

Feb 02, 2025

Labcorp Genetics (formerly Invitae), Labcorp

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

-0.84

CADD

Benign

0.070

(source)

DANN

Benign

0.70

PhyloP100

-2.2

Mutation Taster

=100/0

polymorphism

(source)

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

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over