chr10-104031858-C-T

Position:

• chr10-104031858-C-T

Variant summary

Our verdict is Likely benign. Variant got -4 ACMG points: 0P and 4B. BP4_Strong

The NM_000494.4(COL17A1):​c.*377G>A variant causes a 3 prime UTR change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000813 in 297,494 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 Uncertain significance (★).

• Frequency:
  • Genomes: 𝑓 0.00095 (0 hom., cov: 32)
  • Exomes 𝑓: 0.00068 (0 hom.)
• Consequence: COL17A1 NM_000494.4 3_prime_UTR
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.0100

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]

ACMG classification

Verdict is Likely_benign. Variant got -4 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.84).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
COL17A1	NM_000494.4	c.*377G>A		3_prime_UTR_variant	56/56	ENST00000648076.2	NP_000485.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
COL17A1	ENST00000648076.2	c.*377G>A		3_prime_UTR_variant	56/56		NM_000494.4	ENSP00000497653	A2
COL17A1	ENST00000369733.8	c.*377G>A		3_prime_UTR_variant	51/51	5		ENSP00000358748	P4
COL17A1	ENST00000433822.1	c.*32-265G>A		intron_variant		5		ENSP00000388832
COL17A1	ENST00000647647.1	c.*941G>A		3_prime_UTR_variant, NMD_transcript_variant	5/5			ENSP00000497865

Frequencies

GnomAD3 genomes AF: 0.000952 AC: 137 AN: 143976 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.00200

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.000543

Gnomad ASJ AF: 0.00648

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.000201

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.000425

Gnomad OTH AF: 0.00101

GnomAD4 exome AF: 0.000684 AC: 105 AN: 153430 Hom.: 0 Cov.: 0 AF XY: 0.000591 AC XY: 48 AN XY: 81220

Gnomad4 AFR exome AF: 0.000555

Gnomad4 AMR exome AF: 0.000565

Gnomad4 ASJ exome AF: 0.00422

Gnomad4 EAS exome AF: 0.000115

Gnomad4 SAS exome AF: 0.000238

Gnomad4 FIN exome AF: 0.000160

Gnomad4 NFE exome AF: 0.000686

Gnomad4 OTH exome AF: 0.00109

GnomAD4 genome AF: 0.000951 AC: 137 AN: 144064 Hom.: 0 Cov.: 32 AF XY: 0.000925 AC XY: 65 AN XY: 70304

Gnomad4 AFR AF: 0.00199

Gnomad4 AMR AF: 0.000542

Gnomad4 ASJ AF: 0.00648

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.000201

Gnomad4 NFE AF: 0.000425

Gnomad4 OTH AF: 0.00101

Alfa AF: 0.000832 Hom.: 0

Bravo AF: 0.000933

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Junctional epidermolysis bullosa, non-Herlitz type Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jan 12, 2018

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score, this variant could not be ruled out of causing disease and therefore its association with disease required further investigation. A literature search was performed for the gene, cDNA change, and amino acid change (if applicable). No publications were found based on this search. This variant was therefore classified as a variant of unknown significance for this disease. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.84
CADD	Benign	6.9
DANN	Benign	0.65

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

LitVar

Other links and lift over

dbSNP: rs560335891; hg19: chr10-105791616;