chr3-48572018-C-T

Variant names:

Variant summary

Our verdict is Pathogenic. Variant got 15 ACMG points: 15P and 0B. PM2PP2PP3_StrongPP5_Very_Strong

The NM_000094.4(COL7A1):c.7051G>A(p.Gly2351Arg) variant causes a missense change. The variant allele was found at a frequency of 0.00000186 in 1,612,496 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Pathogenic (★★).

Frequency

Genomes: 𝑓 0.0000066 ( 0 hom., cov: 32)

Exomes 𝑓: 0.0000014 ( 0 hom. )

Consequence

COL7A1
NM_000094.4 missense

Scores

Clinical Significance

Pathogenic criteria provided, multiple submitters, no conflicts P:3

Conservation

PhyloP100: 6.09

Variant links:

Genes affected

COL7A1 (HGNC:2214): (collagen type VII alpha 1 chain) This gene encodes the alpha chain of type VII collagen. The type VII collagen fibril, composed of three identical alpha collagen chains, is restricted to the basement zone beneath stratified squamous epithelia. It functions as an anchoring fibril between the external epithelia and the underlying stroma. Mutations in this gene are associated with all forms of dystrophic epidermolysis bullosa. In the absence of mutations, however, an acquired form of this disease can result from an autoimmune response made to type VII collagen. [provided by RefSeq, Jul 2008]

COL7A1 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Pathogenic. Variant got 15 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

PP2

Missense variant in the COL7A1 gene, where missense mutations are typically associated with disease (based on misZ statistic). The gene has 223 curated pathogenic missense variants (we use a threshold of 10). The gene has 262 curated benign missense variants. Gene score misZ: 1.5899 (below the threshold of 3.09). Trascript score misZ: 4.0428 (above the threshold of 3.09). GenCC associations: The gene is linked to recessive dystrophic epidermolysis bullosa, dystrophic epidermolysis bullosa pruriginosa, recessive dystrophic epidermolysis bullosa-generalized other, transient bullous dermolysis of the newborn, epidermolysis bullosa with congenital localized absence of skin and deformity of nails, generalized dominant dystrophic epidermolysis bullosa, dystrophic epidermolysis bullosa, nails only, acral dystrophic epidermolysis bullosa, recessive dystrophic epidermolysis bullosa inversa, pretibial dystrophic epidermolysis bullosa.

PP3

MetaRNN computational evidence supports a deleterious effect, 0.995

PP5

Variant 3-48572018-C-T is Pathogenic according to our data. Variant chr3-48572018-C-T is described in ClinVar as [Pathogenic]. Clinvar id is 1048020.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr3-48572018-C-T is described in Lovd as [Pathogenic]. Variant chr3-48572018-C-T is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
COL7A1	NM_000094.4 link	c.7051G>A	p.Gly2351Arg	missense_variant	Exon 92 of 119	ENST00000681320.1	NP_000085.1	Q02388-1Q59F16

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
COL7A1	ENST00000681320.1 link	c.7051G>A	p.Gly2351Arg	missense_variant	Exon 92 of 119		NM_000094.4	ENSP00000506558.1	Q02388-1
COL7A1	ENST00000328333.12 link	c.7051G>A	p.Gly2351Arg	missense_variant	Exon 91 of 118	1		ENSP00000332371.8	Q02388-1
COL7A1	ENST00000487017.5 link	n.2968G>A		non_coding_transcript_exon_variant	Exon 57 of 83	5

Frequencies

GnomAD3 genomes

AF:

0.00000657

AC:

AN:

152180

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

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:

0.0000147

Gnomad OTH

AF:

0.00

GnomAD4 exome

AF:

0.00000137

AC:

AN:

1460316

Hom.:

Cov.:

AF XY:

0.00000138

AC XY:

AN XY:

726334

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00

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:

0.00000180

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

AF:

0.00000657

AC:

AN:

152180

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

74346

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000147

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000312

Hom.:

Bravo

AF:

0.0000113

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:3

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Epidermolysis bullosa dystrophica

Pathogenic:1

Oct 09, 2017

Biomedical Innovation Departament, CIEMAT

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: research

- -

Recessive dystrophic epidermolysis bullosa

Pathogenic:1

Mar 14, 2022

Center for Research in Genodermatoses and Epidermolysis Bullosa, University of Buenos Aires

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

not provided

Pathogenic:1

Nov 10, 2023

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces glycine, which is neutral and non-polar, with arginine, which is basic and polar, at codon 2351 of the COL7A1 protein (p.Gly2351Arg). This variant is not present in population databases (gnomAD no frequency). This missense change has been observed in individual(s) with autosomal recessive dystrophic epidermolysis bullosa (PMID: 8644730, 12485454, 21448560). In at least one individual the data is consistent with being in trans (on the opposite chromosome) from a pathogenic variant. This variant has been reported in individual(s) with clinical features of autosomal dominant dystrophic epidermolysis bullosa (PMID: 8644730); however, the role of the variant in this condition is currently unclear. ClinVar contains an entry for this variant (Variation ID: 1048020). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is expected to disrupt COL7A1 protein function with a positive predictive value of 95%. This variant disrupts the triple helix domain of COL7A1. Glycine residues within the Gly-Xaa-Yaa repeats of the triple helix domain are required for the structure and stability of fibrillar collagens (PMID: 7695699, 8218237, 19344236), and variants at these glycine residues in COL7A1 are more frequently observed in individuals with disease than in the general population (PMID: 22058051). However, the clinical significance of this observation remains uncertain since only a limited number of affected individuals have been described to date. For these reasons, this variant has been classified as Pathogenic. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.93

BayesDel_addAF

Pathogenic

0.56

BayesDel_noAF

Pathogenic

0.57

CADD

Pathogenic

DANN

Uncertain

0.99

DEOGEN2

Pathogenic

0.92

Eigen

Pathogenic

1.0

Eigen_PC

Pathogenic

0.91

FATHMM_MKL

Pathogenic

0.98

LIST_S2

Uncertain

0.87

M_CAP

Pathogenic

0.67

MetaRNN

Pathogenic

1.0

MetaSVM

Pathogenic

1.0

MutationAssessor

Pathogenic

4.5

PrimateAI

Pathogenic

0.86

PROVEAN

Pathogenic

-5.7

REVEL

Pathogenic

0.99

Sift

Pathogenic

0.0

Sift4G

Pathogenic

0.0

Polyphen

1.0

Vest4

0.98

MutPred

0.99

Gain of methylation at R2346 (P = 0.1264);

MVP

0.95

MPC

0.99

ClinPred

1.0

GERP RS

5.6

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.7

Varity_R

0.96

gMVP

1.0

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.050

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