rs121912837

Positions:

• chr3-48573047-C-G
• chr3-48573047-C-T

Variant summary

Our verdict is Pathogenic. Variant got 17 ACMG points: 17P and 0B. PS1 PM1 PM2 PM5 PP2 PP3_Strong PP5_Moderate

The NM_000094.4(COL7A1):​c.6724G>C​(p.Gly2242Arg) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Pathogenic (★). Another nucleotide change resulting in same amino acid change has been previously reported as Pathogenicin ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. G2242E) has been classified as Pathogenic.

• Frequency: Genomes: not found (cov: 32)
• Consequence: COL7A1 NM_000094.4 missense
• Clinical Significance: Pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 5.44

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 17 ACMG points.

• PS1: Transcript NM_000094.4 (COL7A1) is affected with MISSENSE_VARIANT having same AA change as one Pathogenic present in ClinVar as 17439
• PM1: In a hotspot region, there are 3 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 2 benign, 6 uncertain in NM_000094.4
• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr3-48573046-C-T is described in ClinVar as [Pathogenic]. Clinvar id is 1703942.Status of the report is criteria_provided_single_submitter, 1 stars.
• PP2: Missense variant where missense usually causes diseases, COL7A1
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.994
• PP5: Variant 3-48573047-C-G is Pathogenic according to our data. Variant chr3-48573047-C-G is described in ClinVar as [Pathogenic]. Clinvar id is 208679.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
COL7A1	NM_000094.4	c.6724G>C	p.Gly2242Arg	missense_variant	86/119	ENST00000681320.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
COL7A1	ENST00000681320.1	c.6724G>C	p.Gly2242Arg	missense_variant	86/119		NM_000094.4	P1
COL7A1	ENST00000328333.12	c.6724G>C	p.Gly2242Arg	missense_variant	85/118	1		P1
COL7A1	ENST00000487017.5	n.2641G>C		non_coding_transcript_exon_variant	51/83	5

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 37

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

Inborn genetic diseases Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Ambry Genetics

Oct 04, 2012

Co-segregation data for this variant is currently unavailable. This variant has not been detected in conjunction with a pathogenic mutation to date.This variant was previously reported in the SNPDatabase as rs121912837 (Database of Single Nucleotide Polymorphisms (dbSNP). Bethesda (MD): National Center for Biotechnology Information, National Library of Medicine. (dbSNP Build ID: 135). Available from: http://www.ncbi.nlm.nih.gov/SNP. Accessed Jan 2012). To our knowledge, this alteration has not been previously reported in the NHLBI Exome Sequencing Project (ESP) and 1000 Genome databases. This nucleotide position is well conserved in available vertebrate species. This amino acid position is highly conserved in available vertebrate species.This alteration is predicted to be probably damaging with a score of 0.999 (sensitivity: 0.09; specificity: 0.99)This alteration is predicted to be deleterious with a score of 0.000 (conservation: 2.73) -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.97
BayesDel_addAF	Pathogenic	0.56	D
BayesDel_noAF	Pathogenic	0.56
CADD	Pathogenic	26
DANN	Uncertain	0.99
DEOGEN2	Pathogenic	0.85	D
Eigen	Pathogenic	0.92
Eigen_PC	Pathogenic	0.82
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Uncertain	0.94	D
M_CAP	Pathogenic	0.75	D
MetaRNN	Pathogenic	0.99	D
MetaSVM	Pathogenic	1.0	D
MutationAssessor	Pathogenic	4.4	H
MutationTaster	Benign	1.0	D;D
PrimateAI	Pathogenic	0.90	D
PROVEAN	Pathogenic	-6.4	D
REVEL	Pathogenic	0.98
Sift	Pathogenic	0.0	D
Sift4G	Pathogenic	0.0	D
Polyphen		1.0	D
Vest4		1.0
MutPred		0.95		Gain of glycosylation at S2243 (P = 0.0246);
MVP		0.98
MPC		0.95
ClinPred		1.0	D
GERP RS		5.6
Varity_R		0.79
gMVP		1.0

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.16		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: rs121912837; hg19: chr3-48610480;