Genetic Variant KRT76:p.Cys500Arg (chr12-52769570-A-G) – ACMG Classification: Uncertain_significance (0 pts)

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 2P and 2B. PM2BP4_Moderate

The NM_015848.4(KRT76):c.1498T>C(p.Cys500Arg) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000684 in 1,461,576 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. C500S) has been classified as Uncertain significance.

Frequency

Genomes: not found (cov: 33)

Exomes 𝑓: 0.0000068 ( 0 hom. )

Consequence

KRT76
NM_015848.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 1.36

Publications

0 publications found

Variant links:

Genes affected

KRT76 (HGNC:24430): (keratin 76) Keratins are intermediate filament proteins responsible for the structural integrity of epithelial cells and are subdivided into epithelial keratins and hair keratins. The type II keratins are clustered in a region of chromosome 12q13. [provided by RefSeq, Jun 2009]

KRT76 links:

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ACMG classification

Classification was made for transcript

Our verdict: Uncertain_significance. The variant received 0 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.22143105).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
KRT76	NM_015848.4 link	c.1498T>C	p.Cys500Arg	missense_variant	Exon 8 of 9	ENST00000332411.2	NP_056932.2	Q01546

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
KRT76	ENST00000332411.2 link	c.1498T>C	p.Cys500Arg	missense_variant	Exon 8 of 9	1	NM_015848.4	ENSP00000330101.2		Q01546

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

0.00000684

AC:

AN:

1461576

Hom.:

Cov.:

AF XY:

0.00000550

AC XY:

AN XY:

727124

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33474

American (AMR)

AF:

0.00

AC:

AN:

44722

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26132

East Asian (EAS)

AF:

0.00

AC:

AN:

39698

South Asian (SAS)

AF:

0.00

AC:

AN:

86252

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53412

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5764

European-Non Finnish (NFE)

AF:

0.00000810

AC:

AN:

1111746

Other (OTH)

AF:

0.0000166

AC:

AN:

60376

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.450

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

Cov.:

Alfa

AF:

0.00

Hom.:

Bravo

AF:

0.00000756

TwinsUK

AF:

0.00

AC:

ALSPAC

AF:

0.000259

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Jan 23, 2023

Ambry Genetics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The c.1498T>C (p.C500R) alteration is located in exon 8 (coding exon 8) of the KRT76 gene. This alteration results from a T to C substitution at nucleotide position 1498, causing the cysteine (C) at amino acid position 500 to be replaced by an arginine (R). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Uncertain

0.35

BayesDel_addAF

Benign

0.00098

BayesDel_noAF

Benign

-0.24

CADD

Benign

(source)

DANN

Benign

0.93

DEOGEN2

Benign

0.023

Eigen

Benign

-0.47

Eigen_PC

Benign

-0.33

FATHMM_MKL

Benign

0.13

LIST_S2

Benign

0.37

M_CAP

Benign

0.014

MetaRNN

Benign

0.22

MetaSVM

Benign

-0.97

MutationAssessor

Benign

0.55

PhyloP100

1.4

PrimateAI

Uncertain

0.52

PROVEAN

Pathogenic

-5.3

REVEL

Uncertain

0.30

Sift

Benign

0.27

Sift4G

Benign

0.32

Polyphen

0.12

Vest4

0.56

MutPred

0.50

Gain of solvent accessibility (P = 0.0171);

MVP

0.65

MPC

0.36

ClinPred

0.71

GERP RS

3.7

Varity_R

0.41

gMVP

0.30

Mutation Taster

=97/3

polymorphism

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.020

Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

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12-52769570-A-G

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over