16-2496681-C-T

Variant names:

Variant summary

Our verdict is Pathogenic. The variant received 12 ACMG points: 12P and 0B. PM2PM5PP5_Very_Strong

The NM_001199107.2(TBC1D24):c.533C>T(p.Ser178Leu) variant causes a missense change. The variant allele was found at a frequency of 0.00000205 in 1,460,950 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Likely pathogenic (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. S178W) has been classified as Likely pathogenic.

Frequency

Genomes: not found (cov: 33)

Exomes 𝑓: 0.0000021 ( 0 hom. )

Consequence

TBC1D24
NM_001199107.2 missense

Scores

Clinical Significance

Pathogenic criteria provided, multiple submitters, no conflicts P:4O:2

Conservation

PhyloP100: 6.08

Publications

17 publications found

Variant links:

Genes affected

TBC1D24 (HGNC:29203): (TBC1 domain family member 24) This gene encodes a protein with a conserved domain, referred to as the TBC domain, characteristic of proteins which interact with GTPases. TBC domain proteins may serve as GTPase-activating proteins for a particular group of GTPases, the Rab (Ras-related proteins in brain) small GTPases which are involved in the regulation of membrane trafficking. Mutations in this gene are associated with familial infantile myoclonic epilepsy. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Feb 2011]

TBC1D24 Gene-Disease associations (from GenCC):

DOORS syndrome
Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Ambry Genetics, Labcorp Genetics (formerly Invitae), ClinGen, Orphanet, PanelApp Australia, G2P
familial infantile myoclonic epilepsy
Inheritance: AR Classification: DEFINITIVE, MODERATE, SUPPORTIVE Submitted by: G2P, Ambry Genetics, Orphanet
autosomal dominant nonsyndromic hearing loss 65
Inheritance: AD Classification: STRONG, MODERATE Submitted by: Ambry Genetics, Labcorp Genetics (formerly Invitae)
autosomal dominant nonsyndromic hearing loss
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
malignant migrating partial seizures of infancy
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
focal epilepsy-intellectual disability-cerebro-cerebellar malformation
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
hearing loss, autosomal recessive
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
progressive myoclonic epilepsy with dystonia
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
nonsyndromic genetic hearing loss
Inheritance: AD Classification: LIMITED Submitted by: ClinGen
autosomal recessive nonsyndromic hearing loss 86
Inheritance: AR Classification: LIMITED Submitted by: Ambry Genetics

TBC1D24 links:

ENSG00000260272 (HGNC:):

ENSG00000260272 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Pathogenic. The variant received 12 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

PM5

Other missense variant is known to change same aminoacid residue: Variant chr16-2496681-C-G is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 982832.

PP5

Variant 16-2496681-C-T is Pathogenic according to our data. Variant chr16-2496681-C-T is described in ClinVar as Pathogenic/Likely_pathogenic. ClinVar VariationId is 133246.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
TBC1D24	NM_001199107.2 link	c.533C>T	p.Ser178Leu	missense_variant	Exon 2 of 8	ENST00000646147.1	NP_001186036.1	Q9ULP9-1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
TBC1D24	ENST00000646147.1 link	c.533C>T	p.Ser178Leu	missense_variant	Exon 2 of 8		NM_001199107.2	ENSP00000494678.1		Q9ULP9-1
ENSG00000260272	ENST00000564543.1 link	c.533C>T	p.Ser178Leu	missense_variant	Exon 1 of 3	2		ENSP00000455547.1		H3BQ06

Frequencies

GnomAD3 genomes

Cov.:

GnomAD2 exomes

AF:

0.00000804

AC:

AN:

248760

AF XY:

0.0000148

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 FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000177

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000205

AC:

AN:

1460950

Hom.:

Cov.:

AF XY:

0.00000275

AC XY:

AN XY:

726854

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33480

American (AMR)

AF:

0.00

AC:

AN:

44718

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26136

East Asian (EAS)

AF:

0.00

AC:

AN:

39700

South Asian (SAS)

AF:

0.00

AC:

AN:

86250

European-Finnish (FIN)

AF:

0.00

AC:

AN:

52522

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5768

European-Non Finnish (NFE)

AF:

0.00000270

AC:

AN:

1111996

Other (OTH)

AF:

0.00

AC:

AN:

60380

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.508

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

Cov.:

ExAC

AF:

0.0000165

AC:

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:4Other:2

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Autosomal dominant nonsyndromic hearing loss 65

Pathogenic:2

Dec 22, 2014

Division of Medical Genetics; Sainte-Justine Hospital

Significance:Pathogenic

Review Status:flagged submission

Collection Method:literature only

- -

Jul 01, 2014

OMIM

Significance:Pathogenic

Review Status:flagged submission

Collection Method:literature only

- -

not provided

Pathogenic:1

Aug 01, 2018

CeGaT Center for Human Genetics Tuebingen

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Developmental and epileptic encephalopathy, 1;C3892048:Autosomal dominant nonsyndromic hearing loss 65;CN236805:Caused by mutation in the TBC1 domain family, member 24

Pathogenic:1

Jan 22, 2023

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This missense change has been observed in individuals with autosomal dominant non-syndromic deafness (PMID: 24729539, 24729547, 33986365). It has also been observed to segregate with disease in related individuals. This sequence change replaces serine, which is neutral and polar, with leucine, which is neutral and non-polar, at codon 178 of the TBC1D24 protein (p.Ser178Leu). This variant is present in population databases (rs483352866, gnomAD 0.002%). ClinVar contains an entry for this variant (Variation ID: 133246). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is not expected to disrupt TBC1D24 protein function. For these reasons, this variant has been classified as Pathogenic. -

Autosomal recessive nonsyndromic hearing loss 86

Other:1

Molecular Biology of Hearing and Deafness Laboratory, Xinhua Hospital

Significance:not provided

Review Status:no classification provided

Collection Method:literature only

- -

DOORS syndrome

Other:1

GeneReviews

Significance:not provided

Review Status:no classification provided

Collection Method:literature only

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Uncertain

0.56

BayesDel_addAF

Uncertain

0.092

BayesDel_noAF

Benign

-0.090

CADD

Pathogenic

(source)

DANN

Uncertain

1.0

DEOGEN2

Benign

0.0049

.;T;T;.;.;.;.

Eigen

Uncertain

0.38

Eigen_PC

Uncertain

0.45

FATHMM_MKL

Uncertain

0.96

LIST_S2

Pathogenic

0.99

.;.;D;D;D;D;D

M_CAP

Uncertain

0.23

MetaRNN

Uncertain

0.64

D;D;D;D;D;D;D

MetaSVM

Benign

-1.1

MutationAssessor

Uncertain

2.3

M;M;M;.;.;M;.

PhyloP100

6.1

PrimateAI

Uncertain

0.71

PROVEAN

Benign

-1.1

N;.;N;.;.;.;N

REVEL

Pathogenic

0.67

Sift

Benign

0.14

T;.;T;.;.;.;T

Sift4G

Uncertain

0.011

D;.;D;.;.;D;D

Polyphen

0.93

P;P;P;.;.;P;.

Vest4

0.87

MutPred

0.53

Loss of relative solvent accessibility (P = 0.3219);Loss of relative solvent accessibility (P = 0.3219);Loss of relative solvent accessibility (P = 0.3219);Loss of relative solvent accessibility (P = 0.3219);Loss of relative solvent accessibility (P = 0.3219);Loss of relative solvent accessibility (P = 0.3219);Loss of relative solvent accessibility (P = 0.3219);

MVP

0.61

MPC

0.77, 0.84

ClinPred

0.90

GERP RS

5.4

Varity_R

0.21

gMVP

0.71

Mutation Taster

=4/96

disease causing (ClinVar)

(source)

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

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over