Genetic Variant KRTAP4-2:p.Arg37His (chr17-41178055-C-T) – ACMG Classification: Likely_benign (-2 pts)

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 2P and 4B. PM2BP4_Strong

The NM_033062.4(KRTAP4-2):c.110G>A(p.Arg37His) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000874 in 1,613,608 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 13/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: 𝑓 0.00020 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000076 ( 0 hom. )

Consequence

KRTAP4-2
NM_033062.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 0.0210

Variant links:

Genes affected

KRTAP4-2 (HGNC:18900): (keratin associated protein 4-2) This protein is a member of the keratin-associated protein (KAP) family. The KAP proteins form a matrix of keratin intermediate filaments which contribute to the structure of hair fibers. KAP family members appear to have unique, family-specific amino- and carboxyl-terminal regions and are subdivided into three multi-gene families according to amino acid composition: the high sulfur, the ultrahigh sulfur, and the high tyrosine/glycine KAPs. This protein is a member of the ultrahigh sulfur KAP family and the gene is localized to a cluster of KAPs at 17q12-q21. [provided by RefSeq, Jul 2008]

KRTAP4-2 links:

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ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -2 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.044656485).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
KRTAP4-2	NM_033062.4 link	c.110G>A	p.Arg37His	missense_variant	Exon 1 of 1	ENST00000377726.3	NP_149051.2	Q9BYR5

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
KRTAP4-2	ENST00000377726.3 link	c.110G>A	p.Arg37His	missense_variant	Exon 1 of 1	6	NM_033062.4	ENSP00000366955.2		Q9BYR5

Frequencies

GnomAD3 genomes

AF:

0.000197

AC:

AN:

151968

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000629

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.0000655

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000441

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000802

AC:

AN:

249378

Hom.:

AF XY:

0.0000665

AC XY:

AN XY:

135374

show subpopulations

Gnomad AFR exome

AF:

0.000721

Gnomad AMR exome

AF:

0.0000868

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.0000544

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.0000462

Gnomad NFE exome

AF:

0.0000355

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000759

AC:

111

AN:

1461522

Hom.:

Cov.:

176

AF XY:

0.0000619

AC XY:

AN XY:

727074

show subpopulations

Gnomad4 AFR exome

AF:

0.000359

Gnomad4 AMR exome

AF:

0.0000672

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.0000504

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.0000187

Gnomad4 NFE exome

AF:

0.0000782

Gnomad4 OTH exome

AF:

0.0000994

GnomAD4 genome

AF:

0.000197

AC:

AN:

152086

Hom.:

Cov.:

AF XY:

0.000175

AC XY:

AN XY:

74358

show subpopulations

Gnomad4 AFR

AF:

0.000627

Gnomad4 AMR

AF:

0.0000654

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000441

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000901

Hom.:

Bravo

AF:

0.000219

ESP6500AA

AF:

0.000682

AC:

ESP6500EA

AF:

0.00

AC:

ExAC

AF:

0.0000824

AC:

EpiCase

AF:

0.00

EpiControl

AF:

0.000119

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

May 01, 2024

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.110G>A (p.R37H) alteration is located in exon 1 (coding exon 1) of the KRTAP4-2 gene. This alteration results from a G to A substitution at nucleotide position 110, causing the arginine (R) at amino acid position 37 to be replaced by a histidine (H). 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

Benign

0.10

BayesDel_addAF

Benign

-0.50

BayesDel_noAF

Benign

-0.54

CADD

Benign

DANN

Benign

0.93

DEOGEN2

Benign

0.097

Eigen

Benign

-0.84

Eigen_PC

Benign

-0.98

FATHMM_MKL

Benign

0.076

LIST_S2

Benign

0.13

M_CAP

Benign

0.0030

MetaRNN

Benign

0.045

MetaSVM

Benign

-0.92

MutationAssessor

Pathogenic

3.2

PrimateAI

Benign

0.18

PROVEAN

Uncertain

-3.7

REVEL

Benign

0.054

Sift

Uncertain

0.016

Sift4G

Uncertain

0.057

Polyphen

0.11

Vest4

0.16

MVP

0.28

MPC

0.11

ClinPred

0.092

GERP RS

-1.7

Varity_R

0.14

gMVP

0.060

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.010

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