Genetic Variant TBC1D24:p.Arg526Pro (chr16-2500855-G-C) – ACMG Classification: Uncertain_significance (3 pts)

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 3P and 0B. PM2PP3

The NM_001199107.2(TBC1D24):c.1577G>C(p.Arg526Pro) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: not found (cov: 33)

Exomes 𝑓: 0.0 ( 0 hom. )

Failed GnomAD Quality Control

Consequence

TBC1D24
NM_001199107.2 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 3.83

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 links:

ENSG00000260272 (HGNC:):

ENSG00000260272 links:

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ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 3 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

PP3

MetaRNN computational evidence supports a deleterious effect, 0.801

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
TBC1D24	NM_001199107.2 link	c.1577G>C	p.Arg526Pro	missense_variant	Exon 8 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.1577G>C	p.Arg526Pro	missense_variant	Exon 8 of 8		NM_001199107.2	ENSP00000494678.1		Q9ULP9-1
ENSG00000260272	ENST00000564543.1 link	c.965+3742G>C		intron_variant	Intron 1 of 2	2		ENSP00000455547.1		H3BQ06

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

Data not reliable, filtered out with message: AC0;AS_VQSR

AF:

0.00

AC:

AN:

1457374

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

725258

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:

0.00

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

Cov.:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

Inborn genetic diseases

Uncertain:1

May 09, 2023

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.1577G>C (p.R526P) alteration is located in exon 8 (coding exon 7) of the TBC1D24 gene. This alteration results from a G to C substitution at nucleotide position 1577, causing the arginine (R) at amino acid position 526 to be replaced by a proline (P). 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

Pathogenic

0.96

BayesDel_addAF

Pathogenic

0.21

BayesDel_noAF

Uncertain

0.060

CADD

Pathogenic

DANN

Uncertain

0.99

DEOGEN2

Benign

0.20

.;T;T;.

Eigen

Uncertain

0.56

Eigen_PC

Uncertain

0.48

FATHMM_MKL

Uncertain

0.88

LIST_S2

Benign

0.72

.;.;T;T

M_CAP

Benign

0.030

MetaRNN

Pathogenic

0.80

D;D;D;D

MetaSVM

Benign

-0.64

MutationAssessor

Pathogenic

3.2

.;M;M;.

PrimateAI

Benign

0.44

PROVEAN

Uncertain

-3.2

D;.;D;.

REVEL

Uncertain

0.30

Sift

Benign

0.056

T;.;T;.

Sift4G

Benign

0.17

T;.;T;T

Polyphen

0.99

D;D;D;D

Vest4

0.65

MutPred

0.68

.;Loss of catalytic residue at R526 (P = 0.0168);Loss of catalytic residue at R526 (P = 0.0168);.;

MVP

0.87

MPC

1.2

ClinPred

0.98

GERP RS

3.6

Varity_R

0.96

gMVP

0.91

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

No publications associated with this variant yet.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over