NM_000494.4:c.2971G>A

Variant names:

Variant summary

Our verdict is Benign. The variant received -9 ACMG points: 0P and 9B. BP4_StrongBP6BS2

The NM_000494.4(COL17A1):c.2971G>A(p.Val991Met) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000574 in 1,613,312 control chromosomes in the GnomAD database, including 13 homozygotes. In-silico tool predicts a benign outcome for this variant. 14/22 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Synonymous variant affecting the same amino acid position (i.e. V991V) has been classified as Likely benign.

Frequency

Genomes: 𝑓 0.00064 ( 2 hom., cov: 31)

Exomes 𝑓: 0.00057 ( 11 hom. )

Consequence

COL17A1
NM_000494.4 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:2B:2

Conservation

PhyloP100: -1.99

Publications

6 publications found

Variant links:

Genes affected

COL17A1 (HGNC:2194): (collagen type XVII alpha 1 chain) This gene encodes the alpha chain of type XVII collagen. Unlike most collagens, collagen XVII is a transmembrane protein. Collagen XVII is a structural component of hemidesmosomes, multiprotein complexes at the dermal-epidermal basement membrane zone that mediate adhesion of keratinocytes to the underlying membrane. Mutations in this gene are associated with both generalized atrophic benign and junctional epidermolysis bullosa. Two homotrimeric forms of type XVII collagen exist. The full length form is the transmembrane protein. A soluble form, referred to as either ectodomain or LAD-1, is generated by proteolytic processing of the full length form. [provided by RefSeq, Jul 2008]

COL17A1 Gene-Disease associations (from GenCC):

epithelial recurrent erosion dystrophy
Inheritance: AD Classification: DEFINITIVE, STRONG, MODERATE, SUPPORTIVE Submitted by: Orphanet, Labcorp Genetics (formerly Invitae), G2P, Ambry Genetics
epidermolysis bullosa, junctional 4, intermediate
Inheritance: AR Classification: DEFINITIVE Submitted by: Ambry Genetics, G2P
junctional epidermolysis bullosa, non-Herlitz type
Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: Genomics England PanelApp, Ambry Genetics, Labcorp Genetics (formerly Invitae)
amelogenesis imperfecta
Inheritance: AD Classification: MODERATE Submitted by: Ambry Genetics
generalized junctional epidermolysis bullosa non-Herlitz type
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
late-onset junctional epidermolysis bullosa
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
localized junctional epidermolysis bullosa, non-Herlitz type
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

COL17A1 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -9 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.007331401).

BP6

Variant 10-104038505-C-T is Benign according to our data. Variant chr10-104038505-C-T is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 225319.

BS2

High Homozygotes in GnomAd4 at 2 AD,AR gene

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_000494.4. 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
	COL17A1	NM_000494.4	MANE Select	c.2971G>A	p.Val991Met	missense	Exon 45 of 56	NP_000485.3

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
COL17A1	ENST00000648076.2	MANE Select	c.2971G>A	p.Val991Met	missense	Exon 45 of 56	ENSP00000497653.1	Q9UMD9-1
COL17A1	ENST00000859462.1		c.2971G>A	p.Val991Met	missense	Exon 45 of 56	ENSP00000529521.1
COL17A1	ENST00000859464.1		c.2968G>A	p.Val990Met	missense	Exon 45 of 56	ENSP00000529523.1

Frequencies

GnomAD3 genomes

AF:

0.000644

AC:

AN:

152094

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000262

Gnomad ASJ

AF:

0.0219

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.000250

Gnomad OTH

AF:

0.000478

GnomAD2 exomes

AF:

0.00116

AC:

289

AN:

249246

AF XY:

0.00109

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.0000869

Gnomad ASJ exome

AF:

0.0246

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.0000477

Gnomad NFE exome

AF:

0.000222

Gnomad OTH exome

AF:

0.00213

GnomAD4 exome

AF:

0.000567

AC:

828

AN:

1461218

Hom.:

Cov.:

AF XY:

0.000564

AC XY:

410

AN XY:

726948

show subpopulations

African (AFR)

AF:

0.0000299

AC:

AN:

33480

American (AMR)

AF:

0.000157

AC:

AN:

44722

Ashkenazi Jewish (ASJ)

AF:

0.0231

AC:

603

AN:

26136

East Asian (EAS)

AF:

0.00

AC:

AN:

39700

South Asian (SAS)

AF:

0.0000232

AC:

AN:

86256

European-Finnish (FIN)

AF:

0.0000189

AC:

AN:

52792

Middle Eastern (MID)

AF:

0.000173

AC:

AN:

5764

European-Non Finnish (NFE)

AF:

0.0000944

AC:

105

AN:

1111980

Other (OTH)

AF:

0.00179

AC:

108

AN:

60388

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.476

Heterozygous variant carriers

100

151

201

251

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Exome Hom

Variant carriers

100

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.000644

AC:

AN:

152094

Hom.:

Cov.:

AF XY:

0.000633

AC XY:

AN XY:

74286

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

41410

American (AMR)

AF:

0.000262

AC:

AN:

15280

Ashkenazi Jewish (ASJ)

AF:

0.0219

AC:

AN:

3472

East Asian (EAS)

AF:

0.00

AC:

AN:

5182

South Asian (SAS)

AF:

0.00

AC:

AN:

4818

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10606

Middle Eastern (MID)

AF:

0.00

AC:

AN:

316

European-Non Finnish (NFE)

AF:

0.000250

AC:

AN:

68008

Other (OTH)

AF:

0.000478

AC:

AN:

2090

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.495

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Genome Hom

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

Alfa

AF:

0.00114

Hom.:

Bravo

AF:

0.000559

TwinsUK

AF:

0.000270

AC:

ALSPAC

AF:

0.00

AC:

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.00140

AC:

ExAC

AF:

0.000807

AC:

EpiCase

AF:

0.000491

EpiControl

AF:

0.000652

ClinVar

ClinVar submissions

Significance:Conflicting classifications of pathogenicity

Revision:criteria provided, conflicting classifications

View on ClinVar

Pathogenic

VUS

Benign

Condition

Junctional epidermolysis bullosa, non-Herlitz type (2)

COL17A1-related disorder (1)

not provided (1)

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.082

BayesDel_addAF

Benign

-0.094

BayesDel_noAF

Benign

-0.090

CADD

Benign

0.21

(source)

DANN

Uncertain

0.99

DEOGEN2

Benign

0.16

Eigen

Benign

-1.5

Eigen_PC

Benign

-1.5

FATHMM_MKL

Benign

0.0070

LIST_S2

Benign

0.57

M_CAP

Benign

0.023

MetaRNN

Benign

0.0073

MetaSVM

Benign

-0.42

MutationAssessor

Benign

1.3

PhyloP100

-2.0

PrimateAI

Benign

0.33

PROVEAN

Benign

-0.18

REVEL

Uncertain

0.49

Sift

Benign

0.25

Sift4G

Benign

0.13

Polyphen

0.0070

Vest4

0.072

MVP

0.38

MPC

0.081

ClinPred

0.029

GERP RS

-3.4

Varity_R

0.026

gMVP

0.12

Mutation Taster

=96/4

polymorphism

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.010

Details are displayed if max score is > 0.2

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

Publications

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

Age Distribution

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over