chr12-52806936-G-A

Position:

chr12-52806936-G-A

Variant summary

Our verdict is Benign. Variant got -20 ACMG points: 0P and 20B. BP4_StrongBP6_Very_StrongBS1BS2

The NM_002272.4(KRT4):c.*133C>T variant causes a 3 prime UTR change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.003 in 867,112 control chromosomes in the GnomAD database, including 49 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Benign (★★).

Frequency

Genomes: 𝑓 0.011 ( 33 hom., cov: 32)

Exomes 𝑓: 0.0013 ( 16 hom. )

Consequence

KRT4
NM_002272.4 3_prime_UTR

Scores

Clinical Significance

Benign criteria provided, multiple submitters, no conflicts B:2

Conservation

PhyloP100: -3.04

Variant links:

Genes affected

KRT4 (HGNC:6441): (keratin 4) 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 differentiated layers of the mucosal and esophageal epithelia with family member KRT13. Mutations in these genes have been associated with White Sponge Nevus, characterized by oral, esophageal, and anal leukoplakia. The type II cytokeratins are clustered in a region of chromosome 12q12-q13. [provided by RefSeq, Jul 2008]

KRT4 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Benign. Variant got -20 ACMG points.

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.74).

BP6

Variant 12-52806936-G-A is Benign according to our data. Variant chr12-52806936-G-A is described in ClinVar as [Benign]. Clinvar id is 309661.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

BS1

Variant frequency is greater than expected in population afr. gnomad4 allele frequency = 0.0111 (1690/152312) while in subpopulation AFR AF= 0.0392 (1627/41548). AF 95% confidence interval is 0.0376. There are 33 homozygotes in gnomad4. There are 830 alleles in male gnomad4 subpopulation. Median coverage is 32. This position pass quality control queck.

BS2

High AC in GnomAd4 at 1690 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
KRT4	NM_002272.4 linkuse as main transcript	c.*133C>T		3_prime_UTR_variant	9/9	ENST00000551956.2	NP_002263.3	P19013

Ensembl

Gene	Transcript	HGVSc	Effect	#exon/exons	TSL	MANE	Protein	UniProt
KRT4	ENST00000551956 linkuse as main transcript	c.*133C>T	3_prime_UTR_variant	9/9	1	NM_002272.4	ENSP00000448220.1	P19013
KRT4	ENST00000548097.5 linkuse as main transcript	n.*1208C>T	non_coding_transcript_exon_variant	9/9	1		ENSP00000449755.1	F8VX05
KRT4	ENST00000548097.5 linkuse as main transcript	n.*1208C>T	3_prime_UTR_variant	9/9	1		ENSP00000449755.1	F8VX05

Frequencies

GnomAD3 genomes

AF:

0.0110

AC:

1677

AN:

152194

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0390

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00236

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00633

Gnomad NFE

AF:

0.000176

Gnomad OTH

AF:

0.00621

GnomAD4 exome

AF:

0.00127

AC:

911

AN:

714800

Hom.:

Cov.:

AF XY:

0.00100

AC XY:

378

AN XY:

376774

show subpopulations

Gnomad4 AFR exome

AF:

0.0366

Gnomad4 AMR exome

AF:

0.00162

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.000168

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000868

Gnomad4 OTH exome

AF:

0.00301

GnomAD4 genome

AF:

0.0111

AC:

1690

AN:

152312

Hom.:

Cov.:

AF XY:

0.0111

AC XY:

830

AN XY:

74474

show subpopulations

Gnomad4 AFR

AF:

0.0392

Gnomad4 AMR

AF:

0.00235

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.000176

Gnomad4 OTH

AF:

0.00614

Alfa

AF:

0.00532

Hom.:

Bravo

AF:

0.0124

Asia WGS

AF:

0.00404

AC:

AN:

3478

ClinVar

Significance: Benign

Submissions summary: Benign:2

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

White sponge nevus 1

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. -

not provided

Benign:1

Benign, criteria provided, single submitter

not provided

Breakthrough Genomics, Breakthrough Genomics

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.74

CADD

Benign

0.31

DANN

Benign

0.83

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