12-52898678-C-T

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 2P and 0B. PM2

The NM_002273.4(KRT8):c.1202+1G>A variant causes a splice donor change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000354 in 1,614,100 control chromosomes in the GnomAD database, with no homozygous occurrence. 3/3 splice prediction tools predicting alterations to normal splicing. Variant has been reported in ClinVar as Uncertain significance (no stars).

Frequency

Genomes: 𝑓 0.00022 ( 0 hom., cov: 33)

Exomes 𝑓: 0.00037 ( 0 hom. )

Consequence

KRT8
NM_002273.4 splice_donor

Scores

Splicing: ADA: 1.000

Clinical Significance

Uncertain significance no assertion criteria provided U:1

Conservation

PhyloP100: 7.78

Variant links:

Genes affected

KRT8 (HGNC:6446): (keratin 8) This gene is a member of the type II keratin family clustered on the long arm of chromosome 12. Type I and type II keratins heteropolymerize to form intermediate-sized filaments in the cytoplasm of epithelial cells. The product of this gene typically dimerizes with keratin 18 to form an intermediate filament in simple single-layered epithelial cells. This protein plays a role in maintaining cellular structural integrity and also functions in signal transduction and cellular differentiation. Mutations in this gene cause cryptogenic cirrhosis. Alternatively spliced transcript variants have been found for this gene. [provided by RefSeq, Jan 2012]

KRT8 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 2 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

Transcripts

RefSeq

Gene	Transcript	HGVSc	Effect	MANE
KRT8	NM_002273.4 linkuse as main transcript	c.1202+1G>A	splice_donor_variant	ENST00000692008.1
KRT8	NM_001256282.2 linkuse as main transcript	c.1286+1G>A	splice_donor_variant
KRT8	NM_001256293.2 linkuse as main transcript	c.1202+1G>A	splice_donor_variant
KRT8	NR_045962.2 linkuse as main transcript	n.1653+1G>A	splice_donor_variant, non_coding_transcript_variant

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
KRT8	ENST00000692008.1 linkuse as main transcript	c.1202+1G>A		splice_donor_variant			NM_002273.4	P2	P05787-1

Frequencies

GnomAD3 genomes

AF:

0.000217

AC:

AN:

152216

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000965

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.0000654

Gnomad ASJ

AF:

0.000864

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.000367

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.000262

AC:

AN:

251444

Hom.:

AF XY:

0.000228

AC XY:

AN XY:

135886

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00119

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.0000327

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.000457

Gnomad OTH exome

AF:

0.000163

GnomAD4 exome

AF:

0.000368

AC:

538

AN:

1461884

Hom.:

Cov.:

AF XY:

0.000347

AC XY:

252

AN XY:

727242

show subpopulations

Gnomad4 AFR exome

AF:

0.0000597

Gnomad4 AMR exome

AF:

0.0000447

Gnomad4 ASJ exome

AF:

0.00111

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.0000348

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.000414

Gnomad4 OTH exome

AF:

0.000679

GnomAD4 genome

AF:

0.000217

AC:

AN:

152216

Hom.:

Cov.:

AF XY:

0.000175

AC XY:

AN XY:

74364

show subpopulations

Gnomad4 AFR

AF:

0.0000965

Gnomad4 AMR

AF:

0.0000654

Gnomad4 ASJ

AF:

0.000864

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.000367

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.000549

Hom.:

Bravo

AF:

0.000242

TwinsUK

AF:

0.000270

AC:

ALSPAC

AF:

0.000519

AC:

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.000233

AC:

ExAC

AF:

0.000239

AC:

EpiCase

AF:

0.000436

EpiControl

AF:

0.000415

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: no assertion criteria provided

LINK: link

Submissions by phenotype

not provided

Uncertain:1

Uncertain significance, no assertion criteria provided

clinical testing

Department of Pathology and Laboratory Medicine, Sinai Health System

The KRT8 c.1202+1G>A variant was not identified in the literature nor was it identified in ClinVar. The variant was identified in dbSNP (ID: rs199648626) and LOVD 3.0 (variant effect not shared). The variant was identified in control databases in 76 of 282834 chromosomes (1 homozygous) at a frequency of 0.0002687 (Genome Aggregation Database March 6, 2019, v2.1.1). The variant was observed in the following populations: Ashkenazi Jewish in 12 of 10368 chromosomes (freq: 0.001157), European (non-Finnish) in 59 of 129150 chromosomes (freq: 0.000457), Other in 1 of 7228 chromosomes (freq: 0.000138), African in 2 of 24960 chromosomes (freq: 0.00008), South Asian in 1 of 30616 chromosomes (freq: 0.000033) and Latino in 1 of 35436 chromosomes (freq: 0.000028), but was not observed in the East Asian or European (Finnish) populations. The c.1202+1G>A variant is predicted to cause abnormal splicing because the nucleotide substitution occurs in the invariant region of the splice consensus sequence. In addition, 3 of 4 in silico or computational prediction software programs (SpliceSiteFinder, MaxEntScan, NNSPLICE, GeneSplicer) predict a greater than 10% difference in splicing. In summary, based on the above information the clinical significance of this variant cannot be determined with certainty at this time. This variant is classified as a variant of uncertain significance. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_addAF

Uncertain

0.15

BayesDel_noAF

Pathogenic

0.33

Cadd

Pathogenic

Dann

Uncertain

1.0

Eigen

Pathogenic

1.1

Eigen_PC

Pathogenic

0.91

FATHMM_MKL

Pathogenic

0.98

MutationTaster

Benign

1.0

D;D;D;D;D

GERP RS

4.3

RBP_binding_hub_radar

0.92

RBP_regulation_power_radar

2.6

Splicing

Name

Calibrated prediction

Score

Prediction

dbscSNV1_ADA

Pathogenic

1.0

dbscSNV1_RF

Pathogenic

0.95

SpliceAI score (max)

0.99

Details are displayed if max score is > 0.2

DS_DG_spliceai

0.78

Position offset: -3

DS_DL_spliceai

0.99

Position offset: 1

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