chr17-41624230-G-A

Variant names:

Variant summary

Our verdict is Pathogenic. The variant received 18 ACMG points: 18P and 0B. PM1PM2PM5PP3_StrongPP5_Very_Strong

The NM_000422.3(KRT17):c.280C>T(p.Arg94Cys) variant causes a missense change. The variant allele was found at a frequency of 0.00000186 in 1,612,620 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Pathogenic (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R94P) has been classified as Pathogenic.

Frequency

Genomes: 𝑓 0.000013 ( 0 hom., cov: 33)

Exomes 𝑓: 6.8e-7 ( 0 hom. )

Consequence

KRT17
NM_000422.3 missense

Scores

Clinical Significance

Pathogenic criteria provided, multiple submitters, no conflicts P:6U:1O:1

Conservation

PhyloP100: 5.06

Publications

21 publications found

Variant links:

Genes affected

KRT17 (HGNC:6427): (keratin 17) This gene encodes the type I intermediate filament chain keratin 17, expressed in nail bed, hair follicle, sebaceous glands, and other epidermal appendages. Mutations in this gene lead to Jackson-Lawler type pachyonychia congenita and steatocystoma multiplex. [provided by RefSeq, Aug 2008]

KRT17 Gene-Disease associations (from GenCC):

sebocystomatosis
Inheritance: AD Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: G2P, Orphanet, Labcorp Genetics (formerly Invitae), Genomics England PanelApp
pachyonychia congenita 2
Inheritance: AD Classification: STRONG Submitted by: Labcorp Genetics (formerly Invitae), Genomics England PanelApp
pachyonychia congenita
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

KRT17 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Pathogenic. The variant received 18 ACMG points.

PM1

In a hotspot region, there are 9 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 2 uncertain in NM_000422.3

PM2

Very rare variant in population databases, with high coverage;

PM5

Other missense variant is known to change same aminoacid residue: Variant chr17-41624229-C-G is described in CliVar as Pathogenic. Clinvar id is 14594.Status of the report is no_assertion_criteria_provided, 0 stars.

PP3

MetaRNN computational evidence supports a deleterious effect, 0.988

PP5

Variant 17-41624230-G-A is Pathogenic according to our data. Variant chr17-41624230-G-A is described in CliVar as Pathogenic. Clinvar id is 14591.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr17-41624230-G-A is described in CliVar as Pathogenic. Clinvar id is 14591.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr17-41624230-G-A is described in CliVar as Pathogenic. Clinvar id is 14591.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr17-41624230-G-A is described in CliVar as Pathogenic. Clinvar id is 14591.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr17-41624230-G-A is described in CliVar as Pathogenic. Clinvar id is 14591.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
KRT17	NM_000422.3 link	c.280C>T	p.Arg94Cys	missense_variant	Exon 1 of 8	ENST00000311208.13	NP_000413.1	Q04695Q14666

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
KRT17	ENST00000311208.13 link	c.280C>T	p.Arg94Cys	missense_variant	Exon 1 of 8	1	NM_000422.3	ENSP00000308452.8		Q04695

Frequencies

GnomAD3 genomes

AF:

0.0000131

AC:

AN:

152140

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000241

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.000193

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.00

GnomAD4 exome

AF:

6.85e-7

AC:

AN:

1460480

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

726548

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33428

American (AMR)

AF:

0.00

AC:

AN:

44722

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26136

East Asian (EAS)

AF:

0.0000252

AC:

AN:

39700

South Asian (SAS)

AF:

0.00

AC:

AN:

86192

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53414

Middle Eastern (MID)

AF:

0.00

AC:

AN:

4628

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

1112000

Other (OTH)

AF:

0.00

AC:

AN:

60260

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.575

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

AF:

0.0000131

AC:

AN:

152140

Hom.:

Cov.:

AF XY:

0.0000135

AC XY:

AN XY:

74326

show subpopulations

African (AFR)

AF:

0.0000241

AC:

AN:

41428

American (AMR)

AF:

0.00

AC:

AN:

15286

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3472

East Asian (EAS)

AF:

0.000193

AC:

AN:

5170

South Asian (SAS)

AF:

0.00

AC:

AN:

4822

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10628

Middle Eastern (MID)

AF:

0.00

AC:

AN:

316

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

68016

Other (OTH)

AF:

0.00

AC:

AN:

2090

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.575

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Alfa

AF:

0.0000768

Hom.:

Bravo

AF:

0.0000113

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:6Uncertain:1Other:1

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not provided

Pathogenic:3Other:1

Jul 10, 2022

GeneDx

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Located within the helix initiation in 1A domain that is intolerant of change; Not observed at significant frequency in large population cohorts (gnomAD); In silico analysis supports that this missense variant has a deleterious effect on protein structure/function; This variant is associated with the following publications: (PMID: 22336949, 31823354, 9767294, 29218738, 26165312, 25946540) -

Dec 01, 2021

CeGaT Center for Human Genetics Tuebingen

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Jun 14, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This sequence change replaces arginine, which is basic and polar, with cysteine, which is neutral and slightly polar, at codon 94 of the KRT17 protein (p.Arg94Cys). This variant is present in population databases (rs58730926, gnomAD 0.01%). This missense change has been observed in individuals with pachyonychia congenita and/or steatocystoma multiplex (PMID: 9767294, 25946540, 26165312, 29218738, 31823354). It has also been observed to segregate with disease in related individuals. ClinVar contains an entry for this variant (Variation ID: 14591). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) has been performed at Invitae for this missense variant, however the output from this modeling did not meet the statistical confidence thresholds required to predict the impact of this variant on KRT17 protein function. For these reasons, this variant has been classified as Pathogenic. -

Epithelial Biology; Institute of Medical Biology, Singapore

Significance:not provided

Review Status:no classification provided

Collection Method:literature only

- -

Steatocystoma multiplex

Pathogenic:2Uncertain:1

Mar 29, 2024

Genomic Medicine Center of Excellence, King Faisal Specialist Hospital and Research Centre

Significance:Uncertain significance

Review Status:flagged submission

Collection Method:clinical testing

- -

Sep 01, 1998

OMIM

Significance:Pathogenic

Review Status:no assertion criteria provided

Collection Method:literature only

- -

Feb 04, 2022

Molecular Genetics, Royal Melbourne Hospital

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This sequence change in KRT17 is predicted to replace arginine with cysteine at codon 94, p.(Arg94Cys). The arginine residue is highly conserved (100 vertebrates, UCSC), and is located in the intermediate filament rod domain, a region (amino acids 92 - 95) that is a mutational hotspot (ClinVar). There is a large physicochemical difference between arginine and cysteine. The highest population minor allele frequency in gnomAD v3.1 is 0.02% (1/5,170 alleles) in the East Asian population, and another singleton is present in the African/African-American population (1/41,428 alleles). This variant has been reported in at least six probands with pachyonychia congenita or steatocystoma multiplex, and segregates with disease in multiple families (PMID: 9767294, 11809119, 22336949, 26165312). Multiple lines of computational evidence predict a deleterious effect for the missense substitution (5/6 algorithms). Based on the classification scheme RMH Modified ACMG Guidelines v1.4.0, this variant is classified as PATHOGENIC. Following criteria are met: PP1_Strong, PS4_Moderate, PM1, PM2_Supporting, PP3. -

Pachyonychia congenita 2

Pathogenic:1

Sep 01, 1998

OMIM

Significance:Pathogenic

Review Status:no assertion criteria provided

Collection Method:literature only

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.95

BayesDel_addAF

Pathogenic

0.46

BayesDel_noAF

Pathogenic

0.43

CADD

Pathogenic

(source)

DANN

Uncertain

1.0

DEOGEN2

Pathogenic

0.92

D;D;.

Eigen

Uncertain

0.28

Eigen_PC

Uncertain

0.32

FATHMM_MKL

Uncertain

0.90

LIST_S2

Benign

0.85

.;D;D

M_CAP

Pathogenic

0.42

MetaRNN

Pathogenic

0.99

D;D;D

MetaSVM

Pathogenic

0.96

MutationAssessor

Pathogenic

3.0

M;M;.

PhyloP100

5.1

PrimateAI

Uncertain

0.70

PROVEAN

Pathogenic

-6.8

.;D;.

REVEL

Pathogenic

0.86

Sift

Uncertain

0.023

.;D;.

Sift4G

Uncertain

0.010

.;D;.

Polyphen

0.32

B;B;.

Vest4

0.99

MutPred

0.99

Gain of catalytic residue at L95 (P = 0.0193);Gain of catalytic residue at L95 (P = 0.0193);.;

MVP

0.96

MPC

0.68

ClinPred

0.97

GERP RS

4.1

PromoterAI

-0.014

Neutral

(source)

Varity_R

0.54

gMVP

0.80

Mutation Taster

=11/89

disease causing (ClinVar)

(source)

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

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over