NM_000094.4:c.6527dupC

Variant names:

• chr3-48573864-A-AG
• rs768128088
• NM_000094.4:c.6527dupC

Variant summary

Our verdict is Pathogenic. The variant received 20 ACMG points: 20P and 0B. PVS1 PS3 PP5_Very_Strong

The NM_000094.4(COL7A1):​c.6527dupC​(p.Gly2177TrpfsTer113) variant causes a frameshift change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000254 in 1,613,850 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Pathogenic (★★). ClinVar reports functional evidence for this variant: "SCV000538019: Functional studies have shown gene and protein expression are not detectable when this variant is present (Hovnanian et al., 1997" and additional evidence is available in ClinVar. Variant results in nonsense mediated mRNA decay.

• Frequency:
  • Genomes: 𝑓 0.000053 (0 hom., cov: 32)
  • Exomes 𝑓: 0.000023 (0 hom.)
• Consequence: COL7A1 NM_000094.4 frameshift
• Clinical Significance: Pathogenic criteria provided, multiple submitters, no conflicts P:13
• Conservation: PhyloP100: 2.60
• Publications: 22 publications found

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 Gene-Disease associations (from GenCC):

• epidermolysis bullosa with congenital localized absence of skin and deformity of nails

  Inheritance: AD, AR Classification: DEFINITIVE, STRONG Submitted by: G2P, Labcorp Genetics (formerly Invitae), Genomics England PanelApp
• dystrophic epidermolysis bullosa pruriginosa

  Inheritance: AR, AD Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Genomics England PanelApp, G2P, Orphanet
• recessive dystrophic epidermolysis bullosa

  Inheritance: AR, AD Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Ambry Genetics, G2P, Orphanet, Genomics England PanelApp, ClinGen
• generalized dominant dystrophic epidermolysis bullosa

  Inheritance: AD Classification: STRONG, SUPPORTIVE Submitted by: Orphanet, Genomics England PanelApp, Labcorp Genetics (formerly Invitae)
• pretibial dystrophic epidermolysis bullosa

  Inheritance: AD, AR Classification: STRONG, SUPPORTIVE Submitted by: Orphanet, Genomics England PanelApp
• transient bullous dermolysis of the newborn

  Inheritance: AR, AD Classification: STRONG, SUPPORTIVE Submitted by: Genomics England PanelApp, Orphanet
• acral dystrophic epidermolysis bullosa

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• dystrophic epidermolysis bullosa, nails only

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• recessive dystrophic epidermolysis bullosa inversa

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
• recessive dystrophic epidermolysis bullosa-generalized other

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Pathogenic. The variant received 20 ACMG points.

• PVS1: Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
• PS3: PS3 evidence extracted from ClinVar submissions: SCV000538019: Functional studies have shown gene and protein expression are not detectable when this variant is present (Hovnanian et al., 1997; Cuadrado-Corrales et al., 2010).
• PP5: Variant 3-48573864-A-AG is Pathogenic according to our data. Variant chr3-48573864-A-AG is described in ClinVar as Pathogenic. ClinVar VariationId is 372345.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_000094.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	COL7A1	NM_000094.4	MANE Select	c.6527dupC	p.Gly2177TrpfsTer113	frameshift	Exon 81 of 119	NP_000085.1	Q02388-1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	COL7A1	ENST00000681320.1	MANE Select	c.6527dupC	p.Gly2177TrpfsTer113	frameshift	Exon 81 of 119	ENSP00000506558.1	Q02388-1
	COL7A1	ENST00000328333.12	TSL:1	c.6527dupC	p.Gly2177TrpfsTer113	frameshift	Exon 80 of 118	ENSP00000332371.8	Q02388-1
	COL7A1	ENST00000487017.5	TSL:5	n.2444dupC		non_coding_transcript_exon	Exon 46 of 83

Frequencies

GnomAD3 genomes AF: 0.0000526 AC: 8 AN: 152152 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.0000483

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.000262

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: 0.000480

GnomAD2 exomes AF: 0.0000678 AC: 17 AN: 250676 AF XY: 0.0000369

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.000434

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000177

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.0000226 AC: 33 AN: 1461698 Hom.: 0 Cov.: 36 AF XY: 0.0000179 AC XY: 13 AN XY: 727146

African (AFR) AF: 0.0000299 AC: 1 AN: 33478

American (AMR) AF: 0.000403 AC: 18 AN: 44718

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26132

East Asian (EAS) AF: 0.00 AC: 0 AN: 39700

South Asian (SAS) AF: 0.00 AC: 0 AN: 86248

European-Finnish (FIN) AF: 0.0000187 AC: 1 AN: 53356

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5708

European-Non Finnish (NFE) AF: 0.0000117 AC: 13 AN: 1111980

Other (OTH) AF: 0.00 AC: 0 AN: 60378

GnomAD4 genome AF: 0.0000526 AC: 8 AN: 152152 Hom.: 0 Cov.: 32 AF XY: 0.0000673 AC XY: 5 AN XY: 74334

African (AFR) AF: 0.0000483 AC: 2 AN: 41436

American (AMR) AF: 0.000262 AC: 4 AN: 15272

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3472

East Asian (EAS) AF: 0.00 AC: 0 AN: 5200

South Asian (SAS) AF: 0.00 AC: 0 AN: 4822

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10622

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 316

European-Non Finnish (NFE) AF: 0.0000147 AC: 1 AN: 68016

Other (OTH) AF: 0.000480 AC: 1 AN: 2084

Alfa AF: 0.00 Hom.: 0

Bravo AF: 0.000132

ClinVar

ClinVar submissions

Significance: Pathogenic

Revision: criteria provided, multiple submitters, no conflicts

Pathogenic	VUS	Benign	Condition
3	-	-	not provided (3)
2	-	-	COL7A1-related disorder (2)
2	-	-	Recessive dystrophic epidermolysis bullosa (2)
1	-	-	Epidermolysis bullosa dystrophica (1)
1	-	-	Epidermolysis bullosa dystrophica inversa, autosomal recessive (1)
1	-	-	Inborn genetic diseases (1)
1	-	-	Recessive dystrophic epidermolysis bullosa;C0268371:Dominant dystrophic epidermolysis bullosa with absence of skin;C0432321:Pretibial dystrophic epidermolysis bullosa;C0432322:Generalized dominant dystrophic epidermolysis bullosa;C1275114:Epidermolysis bullosa pruriginosa;C1843761:Nonsyndromic congenital nail disorder 8;C1851573:Transient bullous dermolysis of the newborn (1)
1	-	-	Recessive dystrophic epidermolysis bullosa;C0432322:Generalized dominant dystrophic epidermolysis bullosa (1)
1	-	-	See cases (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
PhyloP100		2.6
Mutation Taster		=3/197	disease causing (ClinVar)

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.020		Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Other links and lift over

dbSNP: rs768128088; hg19: chr3-48611297; COSMIC: COSV60397862; COSMIC: COSV60397862;