dbSNP rs776584128: KRTAP19-2:p.Cys13Gly (chr21-30487312-A-C) – ACMG Classification: Likely_benign (-2 pts)

Variant summary

Our verdict is Likely benign. The variant received -2 ACMG points: 2P and 4B. PM2BP4_Strong

The NM_181608.2(KRTAP19-2):c.37T>G(p.Cys13Gly) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000684 in 1,461,772 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/20 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 6.8e-7 ( 0 hom. )

Consequence

KRTAP19-2
NM_181608.2 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: -1.44

Variant links:

Genes affected

KRTAP19-2 (HGNC:18937): (keratin associated protein 19-2) Predicted to be located in cytosol. [provided by Alliance of Genome Resources, Apr 2022]

KRTAP19-2 links:

ENSG00000303806 (HGNC:):

ENSG00000303806 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Likely_benign. The variant received -2 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.029264897).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
KRTAP19-2	NM_181608.2 link	c.37T>G	p.Cys13Gly	missense_variant	Exon 1 of 1	ENST00000334055.5	NP_853639.1	Q3LHN2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
KRTAP19-2	ENST00000334055.5 link	c.37T>G	p.Cys13Gly	missense_variant	Exon 1 of 1	6	NM_181608.2	ENSP00000335660.3	Q3LHN2
ENSG00000303806	ENST00000797282.1 link	n.117+11368A>C		intron_variant	Intron 1 of 3
ENSG00000303806	ENST00000797283.1 link	n.117+11368A>C		intron_variant	Intron 1 of 2

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

6.84e-7

AC:

AN:

1461772

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

727192

show subpopulations

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR)

AF:

0.00

AC:

AN:

33470

American (AMR)

AF:

0.00

AC:

AN:

44720

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26136

East Asian (EAS)

AF:

0.00

AC:

AN:

39698

South Asian (SAS)

AF:

0.00

AC:

AN:

86256

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53420

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5766

European-Non Finnish (NFE)

AF:

8.99e-7

AC:

AN:

1111914

Other (OTH)

AF:

0.00

AC:

AN:

60392

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0.000000), which strongly suggests a high chance of mosaicism in these individuals.

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.375

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

Cov.:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Jun 10, 2024

Ambry Genetics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The c.37T>G (p.C13G) alteration is located in exon 1 (coding exon 1) of the KRTAP19-2 gene. This alteration results from a T to G substitution at nucleotide position 37, causing the cysteine (C) at amino acid position 13 to be replaced by a glycine (G). 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

0.11

BayesDel_addAF

Benign

-0.39

BayesDel_noAF

Benign

-0.79

CADD

Benign

0.11

(source)

DANN

Benign

0.44

DEOGEN2

Benign

0.024

Eigen

Benign

-1.7

Eigen_PC

Benign

-1.9

FATHMM_MKL

Benign

0.0055

M_CAP

Benign

0.0018

MetaRNN

Benign

0.029

MetaSVM

Benign

-1.0

PhyloP100

-1.4

PROVEAN

Benign

-1.2

REVEL

Benign

0.050

Sift

Benign

0.60

Sift4G

Benign

0.71

Polyphen

0.0

Vest4

0.10

MutPred

0.16

Loss of stability (P = 0.019);

MVP

0.030

MPC

0.20

ClinPred

0.041

GERP RS

-6.6

PromoterAI

0.0085

Neutral

(source)

Varity_R

0.056

gMVP

0.023

Mutation Taster

=100/0

polymorphism

(source)

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

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rs776584128

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over