chr3-48576249-C-T

Variant names:

• chr3-48576249-C-T
• rs200972872
• NM_000094.4:c.5820G>A

Variant summary

Our verdict is Likely pathogenic. The variant received 9 ACMG points: 9P and 0B. PP3 PP5_Very_Strong

The NM_000094.4(COL7A1):​c.5820G>A​(p.Pro1940Pro) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000112 in 1,613,548 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (★★).

• Frequency:
  • Genomes: 𝑓 0.000099 (0 hom., cov: 33)
  • Exomes 𝑓: 0.00011 (0 hom.)
• Consequence: COL7A1 NM_000094.4 synonymous
• Scores: Splicing: ADA: 0.9996
• Clinical Significance: Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:10
• Conservation: PhyloP100: -0.234
• Publications: 8 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: Likely_pathogenic. The variant received 9 ACMG points.

• PP3: Splicing predictors support a deleterious effect. Scorers claiming Pathogenic: dbscSNV1_ADA, dbscSNV1_RF. Scorers claiming Uncertain: max_spliceai. No scorers claiming Benign.
• PP5: Variant 3-48576249-C-T is Pathogenic according to our data. Variant chr3-48576249-C-T is described in ClinVar as Pathogenic/Likely_pathogenic. ClinVar VariationId is 431810.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.5820G>A	p.Pro1940Pro	synonymous	Exon 71 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.5820G>A	p.Pro1940Pro	synonymous	Exon 71 of 119	ENSP00000506558.1	Q02388-1
	COL7A1	ENST00000328333.12	TSL:1	c.5820G>A	p.Pro1940Pro	synonymous	Exon 70 of 118	ENSP00000332371.8	Q02388-1
	COL7A1	ENST00000487017.5	TSL:5	n.1737G>A		splice_region non_coding_transcript_exon	Exon 36 of 83

Frequencies

GnomAD3 genomes AF: 0.0000986 AC: 15 AN: 152166 Hom.: 0 Cov.: 33

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: 0.000132

Gnomad OTH AF: 0.00

GnomAD2 exomes AF: 0.0000877 AC: 22 AN: 250822 AF XY: 0.000111

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.0000579

Gnomad ASJ exome AF: 0.0000995

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.000159

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.000114 AC: 166 AN: 1461382 Hom.: 0 Cov.: 34 AF XY: 0.000103 AC XY: 75 AN XY: 726970

African (AFR) AF: 0.00 AC: 0 AN: 33470

American (AMR) AF: 0.000157 AC: 7 AN: 44716

Ashkenazi Jewish (ASJ) AF: 0.0000383 AC: 1 AN: 26136

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

South Asian (SAS) AF: 0.0000116 AC: 1 AN: 86250

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53060

Middle Eastern (MID) AF: 0.000176 AC: 1 AN: 5688

European-Non Finnish (NFE) AF: 0.000127 AC: 141 AN: 1111990

Other (OTH) AF: 0.000248 AC: 15 AN: 60372

GnomAD4 genome AF: 0.0000986 AC: 15 AN: 152166 Hom.: 0 Cov.: 33 AF XY: 0.0000941 AC XY: 7 AN XY: 74352

African (AFR) AF: 0.0000483 AC: 2 AN: 41420

American (AMR) AF: 0.000262 AC: 4 AN: 15292

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3470

East Asian (EAS) AF: 0.00 AC: 0 AN: 5180

South Asian (SAS) AF: 0.00 AC: 0 AN: 4836

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10632

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

European-Non Finnish (NFE) AF: 0.000132 AC: 9 AN: 68018

Other (OTH) AF: 0.00 AC: 0 AN: 2090

Alfa AF: 0.000152 Hom.: 0

Bravo AF: 0.000128

Asia WGS AF: 0.000289 AC: 1 AN: 3478

EpiCase AF: 0.000218

EpiControl AF: 0.000415

ClinVar

ClinVar submissions

Significance: Pathogenic/Likely pathogenic

Revision: criteria provided, multiple submitters, no conflicts

Pathogenic	VUS	Benign	Condition
2	-	-	COL7A1-related disorder (2)
2	-	-	not provided (2)
2	-	-	Recessive dystrophic epidermolysis bullosa (2)
1	-	-	Epidermolysis bullosa dystrophica (1)
1	-	-	Epidermolysis bullosa dystrophica inversa, autosomal recessive (1)
1	-	-	Epidermolysis bullosa dystrophica, autosomal recessive, localisata variant (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)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.80
CADD	Benign	19
DANN	Benign	0.64
PhyloP100		-0.23
Mutation Taster		=63/37	disease causing (ClinVar)

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Pathogenic	1.0
dbscSNV1_RF	Pathogenic	0.98
Splicevardb		3.0
SpliceAI score (max)		0.23		Details are displayed if max score is > 0.2
DS_DL_spliceai		0.23		Position offset: 0

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

Other links and lift over

dbSNP: rs200972872; hg19: chr3-48613682; COSMIC: COSV60402313; COSMIC: COSV60402313;