chr12-52519778-C-G

Variant names:

• chr12-52519778-C-G
• rs58163069
• NM_000424.4:c.519G>C

Variant summary

Our verdict is Pathogenic. The variant received 10 ACMG points: 10P and 0B. PM1 PM2 PP3_Strong PP5_Moderate

The NM_000424.4(KRT5):​c.519G>C​(p.Lys173Asn) 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 (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: KRT5 NM_000424.4 missense
• Clinical Significance: Pathogenic criteria provided, single submitter P:2 O:1
• Conservation: PhyloP100: 4.09
• Publications: 5 publications found

Genes affected

KRT5 (HGNC:6442): (keratin 5) The protein encoded by this gene is a member of the keratin gene family. The type II cytokeratins consist of basic or neutral proteins which are arranged in pairs of heterotypic keratin chains coexpressed during differentiation of simple and stratified epithelial tissues. This type II cytokeratin is specifically expressed in the basal layer of the epidermis with family member KRT14. Mutations in these genes have been associated with a complex of diseases termed epidermolysis bullosa simplex. The type II cytokeratins are clustered in a region of chromosome 12q12-q13. [provided by RefSeq, Jul 2008]

KRT5 Gene-Disease associations (from GenCC):

• Dowling-Degos disease

  Inheritance: AD Classification: DEFINITIVE, SUPPORTIVE Submitted by: Orphanet, G2P
• epidermolysis bullosa simplex 1A, generalized severe

  Inheritance: AD Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Orphanet, Genomics England PanelApp, Ambry Genetics
• epidermolysis bullosa simplex 2F, with mottled pigmentation

  Inheritance: AD Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Orphanet, Genomics England PanelApp, PanelApp Australia, G2P
• Dowling-Degos disease 1

  Inheritance: AD Classification: STRONG, MODERATE Submitted by: Labcorp Genetics (formerly Invitae), Ambry Genetics
• epidermolysis bullosa simplex 1B, generalized intermediate

  Inheritance: AD Classification: STRONG, SUPPORTIVE Submitted by: Orphanet, Genomics England PanelApp
• epidermolysis bullosa simplex 1C, localized

  Inheritance: AD Classification: STRONG, SUPPORTIVE Submitted by: Orphanet, Genomics England PanelApp
• epidermolysis bullosa simplex 2B, generalized intermediate

  Inheritance: AD Classification: STRONG Submitted by: Labcorp Genetics (formerly Invitae)
• epidermolysis bullosa simplex 1D, generalized, intermediate or severe, autosomal recessive

  Inheritance: AR Classification: STRONG Submitted by: PanelApp Australia
• epidermolysis bullosa simplex 2d, generalized, intermediate or severe, autosomal recessive

  Inheritance: AR Classification: STRONG, MODERATE Submitted by: Ambry Genetics, Labcorp Genetics (formerly Invitae)
• epidermolysis bullosa simplex 2E, with migratory circinate erythema

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

ENSG00000303382 (HGNC:):

ACMG classification

Our verdict: Pathogenic. The variant received 10 ACMG points.

• PM1: In a hotspot region, there are 14 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 8 uncertain in NM_000424.4
• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.95
• PP5: Variant 12-52519778-C-G is Pathogenic according to our data. Variant chr12-52519778-C-G is described in ClinVar as Pathogenic. ClinVar VariationId is 14643.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
KRT5	NM_000424.4	c.519G>C	p.Lys173Asn	missense_variant	Exon 1 of 9	ENST00000252242.9	NP_000415.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
KRT5	ENST00000252242.9	c.519G>C	p.Lys173Asn	missense_variant	Exon 1 of 9	1	NM_000424.4	ENSP00000252242.4

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:2 Other:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Pathogenic:1 Other:1

-

Epithelial Biology; Institute of Medical Biology, Singapore

Significance: not provided

Review Status: no classification provided

Collection Method: literature only

- -

Jul 28, 2021

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

For these reasons, this variant has been classified as Pathogenic. 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) performed at Invitae indicates that this missense variant is expected to disrupt KRT5 protein function. ClinVar contains an entry for this variant (Variation ID: 14643). This missense change has been observed in individual(s) with autosomal dominant epidermolysis bullosa simplex (PMID: 7534039). It has also been observed to segregate with disease in related individuals. This variant is not present in population databases (ExAC no frequency). This sequence change replaces lysine with asparagine at codon 173 of the KRT5 protein (p.Lys173Asn). The lysine residue is highly conserved and there is a moderate physicochemical difference between lysine and asparagine. -

Epidermolysis bullosa simplex 2B, generalized intermediate Pathogenic:1

Mar 01, 1995

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	1.0
BayesDel_addAF	Pathogenic	0.17	D
BayesDel_noAF	Uncertain	0.0
CADD	Uncertain	26
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.90	D;D;.
Eigen	Uncertain	0.48
Eigen_PC	Uncertain	0.34
FATHMM_MKL	Uncertain	0.90	D
LIST_S2	Benign	0.59	T;T;T
M_CAP	Uncertain	0.23	D
MetaRNN	Pathogenic	0.95	D;D;D
MetaSVM	Pathogenic	0.98	D
MutationAssessor	Pathogenic	3.8	H;.;.
PhyloP100		4.1
PrimateAI	Uncertain	0.74	T
PROVEAN	Uncertain	-4.3	D;D;D
REVEL	Pathogenic	0.72
Sift	Pathogenic	0.0	D;D;D
Sift4G	Pathogenic	0.0010	D;.;D
Polyphen		1.0	D;.;.
Vest4		0.93
MutPred		0.88		Loss of ubiquitination at K173 (P = 0.0233);.;.;
MVP		0.91
MPC		0.89
ClinPred		1.0	D
GERP RS		3.9
Varity_R		0.94
gMVP		0.87
Mutation Taster		=5/95	disease causing (ClinVar)

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

Other links and lift over

dbSNP: rs58163069; hg19: chr12-52913562; COSMIC: COSV52859353; COSMIC: COSV52859353;