rs121912847

chr3-48581271-G-A

Variant summary

Our verdict is Pathogenic. Variant got 16 ACMG points: 16P and 0B. PVS1 PP5_Very_Strong

The NM_000094.4(COL7A1):c.4888C>T(p.Arg1630Ter) variant causes a stop gained change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000682 in 1,613,338 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 (★★). Variant results in nonsense mediated mRNA decay.

• Frequency:
  • Genomes: 𝑓 0.000013 (0 hom., cov: 32)
  • Exomes 𝑓: 0.0000062 (0 hom.)
• Consequence: COL7A1 NM_000094.4 stop_gained
• Clinical Significance: Pathogenic criteria provided, multiple submitters, no conflicts P:5
• Conservation: PhyloP100: 2.67

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]

ACMG classification

Verdict is Pathogenic. Variant got 16 ACMG points.

• PVS1: Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
• PP5: Variant 3-48581271-G-A is Pathogenic according to our data. Variant chr3-48581271-G-A is described in ClinVar as [Pathogenic]. Clinvar id is 17454.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
COL7A1	NM_000094.4	c.4888C>T	p.Arg1630Ter	stop_gained	52/119	ENST00000681320.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
COL7A1	ENST00000681320.1	c.4888C>T	p.Arg1630Ter	stop_gained	52/119		NM_000094.4	P1
COL7A1	ENST00000328333.12	c.4888C>T	p.Arg1630Ter	stop_gained	51/118	1		P1
COL7A1	ENST00000487017.5	n.805C>T		non_coding_transcript_exon_variant	17/83	5

Frequencies

GnomAD3 genomes AF: 0.0000131 AC: 2 AN: 152118 Hom.: 0 Cov.: 32

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: 0.00316

Gnomad NFE AF: 0.0000147

Gnomad OTH AF: 0.00

GnomAD4 exome AF: 0.00000616 AC: 9 AN: 1461102 Hom.: 0 Cov.: 34 AF XY: 0.00000550 AC XY: 4 AN XY: 726818

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.0000224

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.0000116

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000630

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome AF: 0.0000131 AC: 2 AN: 152236 Hom.: 0 Cov.: 32 AF XY: 0.0000269 AC XY: 2 AN XY: 74434

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

Bravo AF: 0.00000378

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:5

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Pathogenic:2

Pathogenic, criteria provided, single submitter	clinical testing	GeneDx	Mar 10, 2016	The R1630X nonsense variant in the COL7A1 gene has been reported previously in association with dystrophic epidermolysis bullosa (Pulkkinen et al., 1999). This pathogenic variant is predicted to cause loss of normal protein function either through protein truncation or nonsense-mediated mRNA decay. The variant was not observed in approximately 6,500 individuals of European and African American ancestry in the NHLBI Exome Sequencing Project, indicating it is not a common benign variant in these populations. -
Pathogenic, criteria provided, single submitter	clinical testing	Invitae	Jul 16, 2023	This variant is not present in population databases (gnomAD no frequency). This premature translational stop signal has been observed in individual(s) with recessive epidermolysis bullosa dystrophica (PMID: 27899325, 32484238). ClinVar contains an entry for this variant (Variation ID: 17454). For these reasons, this variant has been classified as Pathogenic. This sequence change creates a premature translational stop signal (p.Arg1630*) in the COL7A1 gene. It is expected to result in an absent or disrupted protein product. Loss-of-function variants in COL7A1 are known to be pathogenic (PMID: 16971478). -

Epidermolysis bullosa pruriginosa, autosomal recessive Pathogenic:1

Pathogenic, no assertion criteria provided

literature only

OMIM

Oct 01, 2006

- -

Recessive dystrophic epidermolysis bullosa Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

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

Mar 14, 2022

- -

Epidermolysis bullosa dystrophica inversa, autosomal recessive Pathogenic:1

Pathogenic, no assertion criteria provided

clinical testing

Natera, Inc.

Sep 16, 2020

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.63	D
BayesDel_noAF	Pathogenic	0.53
Cadd	Pathogenic	39
Dann	Uncertain	1.0
Eigen	Pathogenic	0.74
Eigen_PC	Uncertain	0.61
FATHMM_MKL	Uncertain	0.94	D
MutationTaster	Benign	1.0	A;A
Vest4		0.94
GERP RS		4.7

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

Other links and lift over

dbSNP: rs121912847; hg19: chr3-48618704; COSMIC: COSV100094767; COSMIC: COSV100094767;