Genetic Variant TPRKB:p.Leu136Val (chr2-73730595-G-C) – ACMG Classification: Uncertain_significance (4 pts)

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM2PM5

The NM_016058.5(TPRKB):c.406C>G(p.Leu136Val) variant causes a missense change. The variant allele was found at a frequency of 0.00000139 in 1,437,018 control chromosomes in the GnomAD database, with no homozygous occurrence. 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. L136P) has been classified as Likely pathogenic.

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 0.0000014 ( 0 hom. )

Consequence

TPRKB
NM_016058.5 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 4.33

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;

PM5

Other missense variant is known to change same aminoacid residue: Variant chr2-73730594-A-G is described in Lovd as [Likely_pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
TPRKB	NM_016058.5 link	c.406C>G	p.Leu136Val	missense_variant	Exon 4 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.406C>G	p.Leu136Val	missense_variant	Exon 4 of 5	1	NM_016058.5	ENSP00000272424.5		Q9Y3C4-1

Frequencies

GnomAD3 genomes

Cov.:

GnomAD3 exomes

AF:

0.00000442

AC:

AN:

226078

Hom.:

AF XY:

0.00000816

AC XY:

AN XY:

122532

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.0000365

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:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000139

AC:

AN:

1437018

Hom.:

Cov.:

AF XY:

0.00000140

AC XY:

AN XY:

714404

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.0000525

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:

0.00

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

Cov.:

Bravo

AF:

0.00000756

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Jun 21, 2022

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.406C>G (p.L136V) alteration is located in exon 4 (coding exon 3) of the TPRKB gene. This alteration results from a C to G substitution at nucleotide position 406, causing the leucine (L) at amino acid position 136 to be replaced by a valine (V). 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

0.14

BayesDel_addAF

Benign

-0.098

BayesDel_noAF

Benign

-0.27

CADD

Benign

DANN

Uncertain

1.0

DEOGEN2

Benign

0.20

T;.;.

Eigen

Uncertain

0.39

Eigen_PC

Uncertain

0.42

FATHMM_MKL

Uncertain

0.83

LIST_S2

Benign

0.79

T;.;T

M_CAP

Benign

0.0073

MetaRNN

Uncertain

0.50

T;T;T

MetaSVM

Benign

-0.78

MutationAssessor

Uncertain

2.3

M;.;.

PrimateAI

Benign

0.46

PROVEAN

Benign

-1.9

N;N;N

REVEL

Benign

0.19

Sift

Benign

0.13

T;T;T

Sift4G

Benign

0.14

T;T;T

Polyphen

0.59

P;D;D

Vest4

0.44

MutPred

0.76

Loss of ubiquitination at K134 (P = 0.1264);.;.;

MVP

0.54

MPC

0.053

ClinPred

0.53

GERP RS

5.2

Varity_R

0.37

gMVP

0.48

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.050

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