NM_006121.4:c.482T>C

Variant names:

• chr12-52679867-A-G
• rs57695159
• NM_006121.4:c.482T>C

Variant summary

Our verdict is Pathogenic. Variant got 10 ACMG points: 10P and 0B. PM1 PM2 PP3_Strong PP5_Moderate

The NM_006121.4(KRT1):​c.482T>C​(p.Leu161Pro) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. 12/21 in silico tools predict a damaging outcome for this variant. Variant has been reported in ClinVar as Pathogenic (★).

• Frequency: Genomes: not found (cov: 31)
• Consequence: KRT1 NM_006121.4 missense
• Clinical Significance: Pathogenic criteria provided, single submitter P:2 O:1
• Conservation: PhyloP100: 7.55

Genes affected

KRT1 (HGNC:6412): (keratin 1) 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 spinous and granular layers of the epidermis with family member KRT10 and mutations in these genes have been associated with bullous congenital ichthyosiform erythroderma. The type II cytokeratins are clustered in a region of chromosome 12q12-q13. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Pathogenic. Variant got 10 ACMG points.

• PM1: In a region_of_interest Head (size 177) in uniprot entity K2C1_HUMAN there are 7 pathogenic changes around while only 0 benign (100%) in NM_006121.4
• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.947
• PP5: Variant 12-52679867-A-G is Pathogenic according to our data. Variant chr12-52679867-A-G is described in ClinVar as [Pathogenic]. Clinvar id is 15908.Status of the report is criteria_provided_single_submitter, 1 stars. Variant chr12-52679867-A-G is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
KRT1	NM_006121.4	c.482T>C	p.Leu161Pro	missense_variant	Exon 1 of 9	ENST00000252244.3	NP_006112.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
KRT1	ENST00000252244.3	c.482T>C	p.Leu161Pro	missense_variant	Exon 1 of 9	1	NM_006121.4	ENSP00000252244.3

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 31

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:2 Other:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Pathogenic:1 Other:1

Mar 20, 2023

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces leucine, which is neutral and non-polar, with proline, which is neutral and non-polar, at codon 161 of the KRT1 protein (p.Leu161Pro). This variant is not present in population databases (gnomAD no frequency). This missense change has been observed in individual(s) with epidermolytic ichthyosis (PMID: 1284546, 1381288). It has also been observed to segregate with disease in related individuals. This variant is also known as leucine to proline amino acid substitution at codon 160. ClinVar contains an entry for this variant (Variation ID: 15908). 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 KRT1 protein function. Experimental studies have shown that this missense change affects KRT1 function (PMID: 1381288). For these reasons, this variant has been classified as Pathogenic. -

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Epithelial Biology; Institute of Medical Biology, Singapore

Significance: not provided

Review Status: no classification provided

Collection Method: literature only

- -

Epidermolytic ichthyosis Pathogenic:1

Sep 04, 1992

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	0.41	D
BayesDel_noAF	Pathogenic	0.36
CADD	Pathogenic	29
DANN	Pathogenic	1.0
DEOGEN2	Pathogenic	0.85	D
Eigen	Pathogenic	0.81
Eigen_PC	Pathogenic	0.69
FATHMM_MKL	Uncertain	0.89	D
LIST_S2	Uncertain	0.97	D
M_CAP	Pathogenic	0.54	D
MetaRNN	Pathogenic	0.95	D
MetaSVM	Pathogenic	1.0	D
MutationAssessor	Pathogenic	3.7	H
PrimateAI	Uncertain	0.66	T
PROVEAN	Pathogenic	-6.1	D
REVEL	Pathogenic	0.94
Sift	Pathogenic	0.0	D
Sift4G	Pathogenic	0.0	D
Polyphen		1.0	D
Vest4		0.97
MutPred		0.74		Gain of catalytic residue at L162 (P = 0);
MVP		0.95
MPC		1.2
ClinPred		1.0	D
GERP RS		4.3
Varity_R		0.96
gMVP		0.98

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: rs57695159; hg19: chr12-53073651;