rs376699648

Variant names:

Variant summary

Our verdict is Pathogenic. The variant received 18 ACMG points: 18P and 0B. PVS1PM2PP5_Very_Strong

The NM_001163435.3(TBCK):c.1363A>T(p.Lys455*) variant causes a stop gained change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.0000118 in 1,606,922 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 Pathogenic (★★). Variant results in nonsense mediated mRNA decay.

Frequency

Genomes: 𝑓 0.000026 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000010 ( 0 hom. )

Consequence

TBCK
NM_001163435.3 stop_gained

Scores

Clinical Significance

Pathogenic criteria provided, multiple submitters, no conflicts P:7

Conservation

PhyloP100: 7.46

Publications

2 publications found

Variant links:

Genes affected

TBCK (HGNC:28261): (TBC1 domain containing kinase) This gene encodes a protein that contains a protein kinase domain, a Rhodanase-like domain and the Tre-2/Bub2/Cdc16 (TBC) domain. The encoded protein is thought to play a role in actin organization, cell growth and cell proliferation by regulating the mammalian target of the rapamycin (mTOR) signaling pathway. This protein may also be involved in the transcriptional regulation of the components of the mTOR complex. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Mar 2014]

TBCK Gene-Disease associations (from GenCC):

hypotonia, infantile, with psychomotor retardation and characteristic facies 3
Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: G2P, Labcorp Genetics (formerly Invitae)

TBCK links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Pathogenic. The variant received 18 ACMG points.

PVS1

Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.

PM2

Very rare variant in population databases, with high coverage;

PP5

Variant 4-106235355-T-A is Pathogenic according to our data. Variant chr4-106235355-T-A is described in ClinVar as Pathogenic. ClinVar VariationId is 225236.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
TBCK	NM_001163435.3 link	c.1363A>T	p.Lys455*	stop_gained	Exon 15 of 26	ENST00000394708.7	NP_001156907.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
TBCK	ENST00000394708.7 link	c.1363A>T	p.Lys455*	stop_gained	Exon 15 of 26	1	NM_001163435.3	ENSP00000378198.2

Frequencies

GnomAD3 genomes

AF:

0.0000263

AC:

AN:

152054

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000131

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:

0.0000294

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.0000205

AC:

AN:

244480

AF XY:

0.0000303

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.0000887

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00000907

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000103

AC:

AN:

1454868

Hom.:

Cov.:

AF XY:

0.00000967

AC XY:

AN XY:

723778

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33242

American (AMR)

AF:

0.0000679

AC:

AN:

44206

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

25930

East Asian (EAS)

AF:

0.0000254

AC:

AN:

39422

South Asian (SAS)

AF:

0.0000351

AC:

AN:

85484

European-Finnish (FIN)

AF:

0.00

AC:

AN:

52532

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5744

European-Non Finnish (NFE)

AF:

0.00000541

AC:

AN:

1108240

Other (OTH)

AF:

0.0000333

AC:

AN:

60068

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.465

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.0000263

AC:

AN:

152054

Hom.:

Cov.:

AF XY:

0.0000269

AC XY:

AN XY:

74274

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

41404

American (AMR)

AF:

0.000131

AC:

AN:

15240

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3468

East Asian (EAS)

AF:

0.00

AC:

AN:

5182

South Asian (SAS)

AF:

0.00

AC:

AN:

4836

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10624

Middle Eastern (MID)

AF:

0.00

AC:

AN:

316

European-Non Finnish (NFE)

AF:

0.0000294

AC:

AN:

67982

Other (OTH)

AF:

0.00

AC:

AN:

2090

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.550

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

Alfa

AF:

0.0000302

Hom.:

Bravo

AF:

0.0000113

ExAC

AF:

0.0000165

AC:

Asia WGS

AF:

0.000289

AC:

AN:

3474

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:7

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

TBCK-related disorder

Pathogenic:2

Aug 16, 2023

PreventionGenetics, part of Exact Sciences

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The TBCK c.1363A>T variant is predicted to result in premature protein termination (p.Lys455*). This variant was reported in a consanguineous family in the homozygous state in two individuals with severe infantile syndromic encephalopathy (Chong et al 2016. PubMed ID: 27040692). This variant is reported in 0.0089% of alleles in individuals of Latino descent in gnomAD (http://gnomad.broadinstitute.org/variant/4-107156512-T-A). Nonsense variants in TBCK are expected to be pathogenic. This variant is interpreted as pathogenic. -

Feb 12, 2024

Rady Children's Institute for Genomic Medicine, Rady Children's Hospital San Diego

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This nonsense variant found in exon 16 of 27 is predicted to result in loss of normal protein function through either protein truncation or nonsense-mediated mRNA decay. Loss-of-function variation in TBCK is an established mechanism of disease (PMID: 29283439, 27040692). This variant has been previously reported as a homozygous change in patients with TBCK-related disorder (PMID: 27040692, 36522252). The c.1363A>T (p.Lys455Ter) variant is present in the heterozygous state in the gnomAD v4 population database at a frequency of 0.001% (19/1606922), and is absent in the homozygous state, thus is presumed to be rare. Based on the available evidence, c.1363A>T (p.Lys455Ter) is classified as Pathogenic. -

not provided

Pathogenic:2

Jun 19, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This sequence change creates a premature translational stop signal (p.Lys455*) in the TBCK gene. It is expected to result in an absent or disrupted protein product. Loss-of-function variants in TBCK are known to be pathogenic (PMID: 27040692, 30103036). This variant is present in population databases (rs376699648, gnomAD 0.009%). This premature translational stop signal has been observed in individual(s) with TBCK-related encephalopathy (PMID: 27040692). ClinVar contains an entry for this variant (Variation ID: 225236). Algorithms developed to predict the effect of sequence changes on RNA splicing suggest that this variant may disrupt the consensus splice site. For these reasons, this variant has been classified as Pathogenic. -

Nov 23, 2021

GeneDx

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Nonsense variant predicted to result in protein truncation or nonsense mediated decay in a gene for which loss-of-function is a known mechanism of disease; This variant is associated with the following publications: (PMID: 27040692, 33240423) -

Hypotonia, infantile, with psychomotor retardation and characteristic facies 3

Pathogenic:2

May 19, 2016

OMIM

Significance:Pathogenic

Review Status:no assertion criteria provided

Collection Method:literature only

- -

Jan 13, 2025

Broad Center for Mendelian Genomics, Broad Institute of MIT and Harvard

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:curation

The p.Lys455Ter variant in TBCK has been reported in least two individuals with TBCK-related intellectual disability syndrome (PMID: 27040692, 36522252), segregated with disease in 1 affected individual from 1 family (PMID: 27040692), and has been identified in 0.008% (5/59446) of Latino/Admixed American chromosomes by the Genome Aggregation Database (gnomAD, http://gnomad.broadinstitute.org; dbSNP ID: rs376699648). Although this variant has been seen in the general population in a heterozygous state, its frequency is low enough to be consistent with a recessive carrier frequency. This variant has also been reported in ClinVar (Variation ID: 225236) and has been interpreted as pathogenic/likely pathogenic by Invitae, OMIM, GeneDx, and the University of Washington Center for Mendelian Genomics (University of Washington). Of the 3 affected individuals, two of those were homozygotes, which increases the likelihood that the p.Lys455Ter variant is pathogenic (Variation ID: 27040692, 36522252). This nonsense variant leads to a premature termination codon at position 455, which is predicted to lead to a truncated or absent protein. Loss of function of the TBCK gene is an established disease mechanism in autosomal recessive TBCK-related intellectual disability syndrome. In summary, this variant meets criteria to be classified as pathogenic for autosomal recessive TBCK-related intellectual disability syndrome. ACMG/AMP Criteria applied: PVS1, PM3, PM2_supporting (Richards 2015). -

Syndromic Infantile Encephalopathy

Pathogenic:1

Apr 07, 2016

University of Washington Center for Mendelian Genomics, University of Washington

Significance:Likely pathogenic

Review Status:no assertion criteria provided

Collection Method:research

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_addAF

Pathogenic

0.49

BayesDel_noAF

Pathogenic

0.65

CADD

Pathogenic

(source)

DANN

Uncertain

1.0

Eigen

Pathogenic

1.0

Eigen_PC

Pathogenic

0.91

FATHMM_MKL

Pathogenic

1.0

PhyloP100

7.5

Vest4

0.50

GERP RS

5.9

Mutation Taster

=0/200

disease causing (ClinVar)

(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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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over