Genetic Variant COL17A1:p.Arg1226Arg (chr10-104034711-G-T) – ACMG Classification: Likely_benign (-1 pts)

Variant summary

Our verdict is Likely benign. The variant received -1 ACMG points: 2P and 3B. PM2BP4_ModerateBP7

The NM_000494.4(COL17A1):c.3676C>A(p.Arg1226Arg) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000685 in 1,459,214 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

Frequency

Genomes: not found (cov: 33)

Exomes 𝑓: 6.9e-7 ( 0 hom. )

Consequence

COL17A1
NM_000494.4 synonymous

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: 3.29

Publications

0 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: G2P, Ambry Genetics, Orphanet, Labcorp Genetics (formerly Invitae), PanelApp Australia
epidermolysis bullosa, junctional 4, intermediate
Inheritance: AR Classification: DEFINITIVE Submitted by: G2P, Ambry Genetics
junctional epidermolysis bullosa, non-Herlitz type
Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: Ambry Genetics, Genomics England PanelApp, PanelApp Australia, 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:

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ACMG classification

Classification was made for transcript

Our verdict: Likely_benign. The variant received -1 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.44).

BP7

Synonymous conserved (PhyloP=3.29 with no splicing effect.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
COL17A1	NM_000494.4 link	c.3676C>A	p.Arg1226Arg	synonymous_variant	Exon 51 of 56	ENST00000648076.2	NP_000485.3	Q9UMD9-1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
COL17A1	ENST00000648076.2 link	c.3676C>A	p.Arg1226Arg	synonymous_variant	Exon 51 of 56		NM_000494.4	ENSP00000497653.1		Q9UMD9-1
COL17A1	ENST00000369733.8 link	c.3430C>A	p.Arg1144Arg	synonymous_variant	Exon 46 of 51	5		ENSP00000358748.3		Q9UMD9-2

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

6.85e-7

AC:

AN:

1459214

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

725596

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33458

American (AMR)

AF:

0.00

AC:

AN:

44264

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26028

East Asian (EAS)

AF:

0.00

AC:

AN:

39610

South Asian (SAS)

AF:

0.00

AC:

AN:

85424

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53184

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5736

European-Non Finnish (NFE)

AF:

9.00e-7

AC:

AN:

1111248

Other (OTH)

AF:

0.00

AC:

AN:

60262

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.525

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

Cov.:

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.44

CADD

Benign

(source)

DANN

Benign

0.63

PhyloP100

3.3

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

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Computational scores

Splicing

Publications

Other links and lift over