12-52644977-A-G

Variant summary

Our verdict is Benign. Variant got -14 ACMG points: 0P and 14B. BP4_StrongBP6_ModerateBS1BS2

The NM_000423.3(KRT2):c.*42T>C variant causes a 3 prime UTR change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00127 in 1,608,950 control chromosomes in the GnomAD database, including 40 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Benign (★).

Frequency

Genomes: 𝑓 0.0014 ( 8 hom., cov: 32)

Exomes 𝑓: 0.0013 ( 32 hom. )

Consequence

KRT2
NM_000423.3 3_prime_UTR

Scores

Clinical Significance

Benign criteria provided, single submitter B:1

Conservation

PhyloP100: 0.931

Variant links:

Genes affected

KRT2 (HGNC:6439): (keratin 2) 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 expressed largely in the upper spinous layer of epidermal keratinocytes and mutations in this gene 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]

KRT2 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Benign. Variant got -14 ACMG points.

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.73).

BP6

Variant 12-52644977-A-G is Benign according to our data. Variant chr12-52644977-A-G is described in ClinVar as [Benign]. Clinvar id is 309593.Status of the report is criteria_provided_single_submitter, 1 stars.

BS1

Variant frequency is greater than expected in population eas. gnomad4 allele frequency = 0.00138 (210/152230) while in subpopulation EAS AF= 0.0367 (190/5176). AF 95% confidence interval is 0.0324. There are 8 homozygotes in gnomad4. There are 119 alleles in male gnomad4 subpopulation. Median coverage is 32. This position pass quality control queck.

BS2

High AC in GnomAd at 211 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
KRT2	NM_000423.3 linkuse as main transcript	c.*42T>C		3_prime_UTR_variant	9/9	ENST00000309680.4

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
KRT2	ENST00000309680.4 linkuse as main transcript	c.*42T>C		3_prime_UTR_variant	9/9	1	NM_000423.3	P1

Frequencies

GnomAD3 genomes

AF:

0.00139

AC:

211

AN:

152112

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000262

Gnomad ASJ

AF:

0.000288

Gnomad EAS

AF:

0.0368

Gnomad SAS

AF:

0.00228

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000147

Gnomad OTH

AF:

0.00144

GnomAD3 exomes

AF:

0.00282

AC:

702

AN:

249128

Hom.:

AF XY:

0.00263

AC XY:

356

AN XY:

135284

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.000199

Gnomad EAS exome

AF:

0.0345

Gnomad SAS exome

AF:

0.00199

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000266

Gnomad OTH exome

AF:

0.000496

GnomAD4 exome

AF:

0.00126

AC:

1835

AN:

1456720

Hom.:

Cov.:

AF XY:

0.00128

AC XY:

926

AN XY:

724966

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.0000447

Gnomad4 ASJ exome

AF:

0.000230

Gnomad4 EAS exome

AF:

0.0395

Gnomad4 SAS exome

AF:

0.00219

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00000993

Gnomad4 OTH exome

AF:

0.000997

GnomAD4 genome

AF:

0.00138

AC:

210

AN:

152230

Hom.:

Cov.:

AF XY:

0.00160

AC XY:

119

AN XY:

74440

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.000262

Gnomad4 ASJ

AF:

0.000288

Gnomad4 EAS

AF:

0.0367

Gnomad4 SAS

AF:

0.00228

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000147

Gnomad4 OTH

AF:

0.00142

Alfa

AF:

0.000423

Hom.:

Bravo

AF:

0.00162

Asia WGS

AF:

0.00606

AC:

AN:

3478

ClinVar

Significance: Benign

Submissions summary: Benign:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

Ichthyosis bullosa of Siemens

Benign:1

Benign, 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 and internal cut-off values, a variant classified as benign is not then subjected to further curation. The score for this variant resulted in a classification of benign for this disease. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.73

Cadd

Benign

Dann

Benign

0.80

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over