chr16-2500855-G-A

Variant names:

• chr16-2500855-G-A
• rs752301570
• NM_001199107.2:c.1577G>A

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_001199107.2(TBC1D24):​c.1577G>A​(p.Arg526His) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 14/22 in silico tools predict a benign outcome for this variant. 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. R526C) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000027 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: TBC1D24 NM_001199107.2 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:2
• Conservation: PhyloP100: 3.83
• Publications: 1 publications found

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: Orphanet, Labcorp Genetics (formerly Invitae), G2P, PanelApp Australia, ClinGen, Ambry Genetics
• familial infantile myoclonic epilepsy

  Inheritance: AR Classification: DEFINITIVE, MODERATE, SUPPORTIVE Submitted by: Orphanet, Ambry Genetics, G2P
• autosomal dominant nonsyndromic hearing loss 65

  Inheritance: AD Classification: STRONG, MODERATE, LIMITED Submitted by: Labcorp Genetics (formerly Invitae), Ambry Genetics, PanelApp Australia
• autosomal recessive nonsyndromic hearing loss 86

  Inheritance: AR Classification: STRONG, LIMITED Submitted by: PanelApp Australia, Ambry Genetics
• developmental and epileptic encephalopathy, 16

  Inheritance: AR Classification: STRONG Submitted by: PanelApp Australia
• 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

ENSG00000260272 (HGNC:):

ACMG classification

Our verdict: Uncertain_significance. The variant received 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.24618295).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001199107.2. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	TBC1D24	NM_001199107.2	MANE Select	c.1577G>A	p.Arg526His	missense	Exon 8 of 8	NP_001186036.1	Q9ULP9-1
	TBC1D24	NM_020705.3		c.1559G>A	p.Arg520His	missense	Exon 7 of 7	NP_065756.1	Q9ULP9-2

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	TBC1D24	ENST00000646147.1	MANE Select	c.1577G>A	p.Arg526His	missense	Exon 8 of 8	ENSP00000494678.1	Q9ULP9-1
	TBC1D24	ENST00000567020.7	TSL:1	c.1559G>A	p.Arg520His	missense	Exon 7 of 7	ENSP00000454408.1	Q9ULP9-2
	ENSG00000260272	ENST00000564543.1	TSL:2	c.965+3742G>A		intron	N/A	ENSP00000455547.1	H3BQ06

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD2 exomes AF: 0.00000411 AC: 1 AN: 243024 AF XY: 0.00000753

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: 0.00000896

Gnomad OTH exome AF: 0.00

GnomAD4 exome Data not reliable, filtered out with message: AS_VQSR AF: 0.00000274 AC: 4 AN: 1457368 Hom.: 0 Cov.: 31 AF XY: 0.00000276 AC XY: 2 AN XY: 725256

African (AFR) AF: 0.00 AC: 0 AN: 33466

American (AMR) AF: 0.00 AC: 0 AN: 44584

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26118

East Asian (EAS) AF: 0.0000252 AC: 1 AN: 39658

South Asian (SAS) AF: 0.00 AC: 0 AN: 86186

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 49512

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5768

European-Non Finnish (NFE) AF: 0.00000270 AC: 3 AN: 1111776

Other (OTH) AF: 0.00 AC: 0 AN: 60300

GnomAD4 genome Cov.: 33

Alfa AF: 0.000381 Hom.: 0

ExAC AF: 0.0000330 AC: 4

ClinVar

ClinVar submissions

Significance: Uncertain significance

Revision: criteria provided, multiple submitters, no conflicts

Pathogenic	VUS	Benign	Condition
-	1	-	Developmental and epileptic encephalopathy, 1;C3892048:Autosomal dominant nonsyndromic hearing loss 65;na:Caused by mutation in the TBC1 domain family, member 24 (1)
-	1	-	not provided (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.071
BayesDel_addAF	Benign	-0.15	T
BayesDel_noAF	Benign	-0.45
CADD	Uncertain	24
DANN	Benign	0.95
DEOGEN2	Benign	0.022	T
Eigen	Benign	0.0070
Eigen_PC	Benign	0.098
FATHMM_MKL	Uncertain	0.84	D
LIST_S2	Uncertain	0.87	D
M_CAP	Benign	0.014	T
MetaRNN	Benign	0.25	T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	1.3	L
PhyloP100		3.8
PrimateAI	Benign	0.42	T
PROVEAN	Benign	-2.0	N
REVEL	Benign	0.059
Sift	Benign	0.090	T
Sift4G	Benign	0.43	T
Polyphen		0.46	P
Vest4		0.13
MutPred		0.56		Loss of methylation at R526 (P = 0.0471)
MVP		0.74
MPC		0.44
ClinPred		0.43	T
GERP RS		3.6
Varity_R		0.17
gMVP		0.51
Mutation Taster		=85/15	polymorphism

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

Other links and lift over

dbSNP: rs752301570; hg19: chr16-2550856; COSMIC: COSV107310189; COSMIC: COSV107310189;