rs121912771

Variant names:

Variant summary

Our verdict is Likely pathogenic. Variant got 8 ACMG points: 8P and 0B. PP5_Very_Strong

The NM_000494.4(COL17A1):c.3908G>A(p.Arg1303Gln) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000123 in 1,613,258 control chromosomes in the GnomAD database, including 1 homozygotes. Variant has been reported in ClinVar as Likely pathogenic (★★).

Frequency

Genomes: 𝑓 0.00016 ( 0 hom., cov: 32)

Exomes 𝑓: 0.00012 ( 1 hom. )

Consequence

COL17A1
NM_000494.4 missense

Scores

Clinical Significance

Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:6

Conservation

PhyloP100: 0.491

Variant links:

Genes affected

COL17A1 (HGNC:2194): (collagen type XVII alpha 1 chain) This gene encodes the alpha chain of type XVII collagen. Unlike most collagens, collagen XVII is a transmembrane protein. Collagen XVII is a structural component of hemidesmosomes, multiprotein complexes at the dermal-epidermal basement membrane zone that mediate adhesion of keratinocytes to the underlying membrane. Mutations in this gene are associated with both generalized atrophic benign and junctional epidermolysis bullosa. Two homotrimeric forms of type XVII collagen exist. The full length form is the transmembrane protein. A soluble form, referred to as either ectodomain or LAD-1, is generated by proteolytic processing of the full length form. [provided by RefSeq, Jul 2008]

COL17A1 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_pathogenic. Variant got 8 ACMG points.

PP5

Variant 10-104034193-C-T is Pathogenic according to our data. Variant chr10-104034193-C-T is described in ClinVar as [Likely_pathogenic]. Clinvar id is 17650.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
COL17A1	NM_000494.4 link	c.3908G>A	p.Arg1303Gln	missense_variant	Exon 52 of 56	ENST00000648076.2	NP_000485.3	Q9UMD9-1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
COL17A1	ENST00000648076.2 link	c.3908G>A	p.Arg1303Gln	missense_variant	Exon 52 of 56		NM_000494.4	ENSP00000497653.1	Q9UMD9-1
COL17A1	ENST00000369733.8 link	c.3662G>A	p.Arg1221Gln	missense_variant	Exon 47 of 51	5		ENSP00000358748.3	Q9UMD9-2
COL17A1	ENST00000647647.1 link	n.-65G>A		upstream_gene_variant				ENSP00000497865.1	A0A3B3ITP5

Frequencies

GnomAD3 genomes

AF:

0.000158

AC:

AN:

152200

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000241

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000131

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.000414

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.000279

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.000108

AC:

AN:

249846

Hom.:

AF XY:

0.000111

AC XY:

AN XY:

135182

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

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:

0.000230

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.000120

AC:

175

AN:

1460940

Hom.:

Cov.:

AF XY:

0.000118

AC XY:

AN XY:

726748

show subpopulations

Gnomad4 AFR exome

AF:

0.0000299

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.0000756

Gnomad4 SAS exome

AF:

0.000209

Gnomad4 FIN exome

AF:

0.0000376

Gnomad4 NFE exome

AF:

0.000134

Gnomad4 OTH exome

AF:

0.0000332

GnomAD4 genome

AF:

0.000158

AC:

AN:

152318

Hom.:

Cov.:

AF XY:

0.0000940

AC XY:

AN XY:

74478

show subpopulations

Gnomad4 AFR

AF:

0.0000240

Gnomad4 AMR

AF:

0.000131

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.000415

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.000279

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.000167

Hom.:

Bravo

AF:

0.0000869

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.000116

AC:

ExAC

AF:

0.000157

AC:

EpiCase

AF:

0.000218

EpiControl

AF:

0.000119

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:6

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not provided

Pathogenic:3

Dec 06, 2021

GeneDx

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Published functional studies demonstrate a damaging effect of the R1303Q variant on keratinocyte adhesion and collagen XVII-laminin interactions (Kroeger et al., 2019); In silico analysis, which includes splice predictors and evolutionary conservation, supports that this missense variant does not alter protein structure/function; This variant is associated with the following publications: (PMID: 31589614, 26604146, 9199555, 17263807, 21466533, 33393081, 23550562, 24005051, 30316981) -

Dec 11, 2022

Revvity Omics, Revvity

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Dec 24, 2023

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces arginine, which is basic and polar, with glutamine, which is neutral and polar, at codon 1303 of the COL17A1 protein (p.Arg1303Gln). This variant is present in population databases (rs121912771, gnomAD 0.02%). This missense change has been observed in individual(s) with clinical features of junctional epidermolysis bullosa (PMID: 21466533, 23550562, 24005051, 26604146). In at least one individual the data is consistent with being in trans (on the opposite chromosome) from a pathogenic variant. ClinVar contains an entry for this variant (Variation ID: 17650). Algorithms developed to predict the effect of variants on protein structure and function are not available or were not evaluated for this variant. Experimental studies are conflicting or provide insufficient evidence to determine the effect of this variant on COL17A1 function (PMID: 26604146). For these reasons, this variant has been classified as Pathogenic. -

COL17A1-related disorder

Pathogenic:1

May 04, 2024

PreventionGenetics, part of Exact Sciences

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: clinical testing

The COL17A1 c.3908G>A variant is predicted to result in the amino acid substitution p.Arg1303Gln. This variant has been reported in the homozygous and compound heterozygous states in individuals with junctional epidermolysis bullosa (Schumann et al. 1997. PubMed ID: 9199555; Condrat et al. 2019. PubMed ID: 30761300; Hérissé et al. 2021. PubMed ID: 33393081). In vitro functional studies using patient keratinocytes demonstrated this variant resides in the laminin-332 binding site and results in diminished cell adhesion and impaired migration (Kroeger et al. 2018. PubMed ID: 30316981). This variant is reported in 0.026% of alleles in individuals of European (non-Finnish) descent in gnomAD. This variant is interpreted as pathogenic. -

Epidermolysis bullosa, junctional 4, intermediate

Pathogenic:1

Jun 01, 1997

OMIM

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: literature only

- -

Epithelial recurrent erosion dystrophy

Pathogenic:1

May 04, 2022

Mendelics

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.081

BayesDel_addAF

Benign

-0.061

BayesDel_noAF

Uncertain

0.010

CADD

Benign

DANN

Benign

0.82

DEOGEN2

Benign

0.21

.;T;T

Eigen

Benign

-0.60

Eigen_PC

Benign

-0.64

FATHMM_MKL

Benign

0.33

LIST_S2

Benign

0.57

T;.;T

M_CAP

Uncertain

0.10

MetaRNN

Uncertain

0.51

D;D;D

MetaSVM

Benign

-0.54

MutationAssessor

Benign

1.4

.;L;L

PrimateAI

Benign

0.44

PROVEAN

Benign

-0.75

N;N;.

REVEL

Uncertain

0.55

Sift

Benign

0.49

T;T;.

Sift4G

Benign

0.33

T;T;.

Polyphen

0.71

.;P;P

Vest4

0.27

MVP

0.67

MPC

0.075

ClinPred

0.065

GERP RS

4.0

Varity_R

0.13

gMVP

0.30

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.21

Details are displayed if max score is > 0.2

DS_AG_spliceai

0.21

Position offset: 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