Genetic Variant TPRKB:p.Arg168Thr (chr2-73729968-C-G) – ACMG Classification: Uncertain_significance (4 pts)

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM2PP3_Moderate

The NM_016058.5(TPRKB):c.503G>C(p.Arg168Thr) variant causes a missense change. The variant allele was found at a frequency of 0.00000423 in 1,420,110 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 0.0000042 ( 0 hom. )

Consequence

TPRKB
NM_016058.5 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 5.97

Variant links:

Genes affected

TPRKB (HGNC:24259): (TP53RK binding protein) Enables protein kinase binding activity. Involved in tRNA threonylcarbamoyladenosine modification. Located in cytosol and nucleus. Part of EKC/KEOPS complex. Implicated in Galloway-Mowat syndrome 5. [provided by Alliance of Genome Resources, Apr 2022]

TPRKB links:

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ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 4 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

PP3

MetaRNN computational evidence supports a deleterious effect, 0.936

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
TPRKB	NM_016058.5 link	c.503G>C	p.Arg168Thr	missense_variant	Exon 5 of 5	ENST00000272424.11	NP_057142.1	Q9Y3C4-1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
TPRKB	ENST00000272424.11 link	c.503G>C	p.Arg168Thr	missense_variant	Exon 5 of 5	1	NM_016058.5	ENSP00000272424.5		Q9Y3C4-1

Frequencies

GnomAD3 genomes

Cov.:

GnomAD3 exomes

AF:

0.0000132

AC:

AN:

227596

Hom.:

AF XY:

0.0000162

AC XY:

AN XY:

123370

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000288

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000423

AC:

AN:

1420110

Hom.:

Cov.:

AF XY:

0.00000426

AC XY:

AN XY:

704572

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00000552

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

Cov.:

Bravo

AF:

0.00000378

ExAC

AF:

0.0000248

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not provided

Uncertain:1

Apr 25, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces arginine, which is basic and polar, with threonine, which is neutral and polar, at codon 168 of the TPRKB protein (p.Arg168Thr). This variant is present in population databases (rs765629057, gnomAD 0.003%). This variant has not been reported in the literature in individuals affected with TPRKB-related conditions. An algorithm developed to predict the effect of missense changes on protein structure and function (PolyPhen-2) suggests that this variant is likely to be disruptive. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.83

BayesDel_addAF

Pathogenic

0.27

BayesDel_noAF

Pathogenic

0.23

CADD

Pathogenic

DANN

Uncertain

0.98

DEOGEN2

Uncertain

0.42

T;.;.

Eigen

Pathogenic

0.77

Eigen_PC

Pathogenic

0.73

FATHMM_MKL

Pathogenic

0.97

LIST_S2

Uncertain

0.93

D;.;D

M_CAP

Benign

0.022

MetaRNN

Pathogenic

0.94

D;D;D

MetaSVM

Benign

-0.39

MutationAssessor

Pathogenic

3.2

M;.;.

PrimateAI

Uncertain

0.70

PROVEAN

Pathogenic

-5.2

D;D;D

REVEL

Uncertain

0.48

Sift

Uncertain

0.0020

D;D;D

Sift4G

Pathogenic

0.0

D;D;D

Polyphen

1.0

D;D;D

Vest4

0.91

MutPred

0.79

Gain of sheet (P = 0.0166);.;.;

MVP

0.80

MPC

0.26

ClinPred

0.98

GERP RS

5.0

Varity_R

0.94

gMVP

0.70

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