16-2500855-G-T

Variant names:

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

Variant summary

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

The NM_001199107.2(TBC1D24):​c.1577G>T​(p.Arg526Leu) variant causes a missense change. The variant allele was found at a frequency of 0.000000686 in 1,457,376 control chromosomes in the GnomAD database, with no homozygous occurrence. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. 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: 6.9e-7 (0 hom.)
• Consequence: TBC1D24 NM_001199107.2 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 3.83
• Publications: 0 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: 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

ENSG00000260272 (HGNC:):

ACMG classification

Our verdict: Uncertain_significance. The variant received 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

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

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	TBC1D24	NM_001199107.2	MANE Select	c.1577G>T	p.Arg526Leu	missense	Exon 8 of 8	NP_001186036.1
	TBC1D24	NM_020705.3		c.1559G>T	p.Arg520Leu	missense	Exon 7 of 7	NP_065756.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	TBC1D24	ENST00000646147.1	MANE Select	c.1577G>T	p.Arg526Leu	missense	Exon 8 of 8	ENSP00000494678.1
	TBC1D24	ENST00000567020.7	TSL:1	c.1559G>T	p.Arg520Leu	missense	Exon 7 of 7	ENSP00000454408.1
	ENSG00000260272	ENST00000564543.1	TSL:2	c.965+3742G>T		intron	N/A	ENSP00000455547.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 6.86e-7 AC: 1 AN: 1457376 Hom.: 0 Cov.: 31 AF XY: 0.00000138 AC XY: 1 AN XY: 725260

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

American (AMR) AF: 0.00 AC: 0 AN: 44586

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

East Asian (EAS) AF: 0.00 AC: 0 AN: 39664

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: 8.99e-7 AC: 1 AN: 1111776

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

GnomAD4 genome Cov.: 33

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.26
BayesDel_addAF	Benign	-0.012	T
BayesDel_noAF	Benign	-0.25
CADD	Uncertain	24
DANN	Uncertain	0.98
DEOGEN2	Benign	0.087	T
Eigen	Uncertain	0.35
Eigen_PC	Uncertain	0.33
FATHMM_MKL	Uncertain	0.89	D
LIST_S2	Uncertain	0.91	D
M_CAP	Benign	0.028	D
MetaRNN	Uncertain	0.45	T
MetaSVM	Benign	-0.88	T
MutationAssessor	Uncertain	2.4	M
PhyloP100		3.8
PrimateAI	Benign	0.43	T
PROVEAN	Uncertain	-2.7	D
REVEL	Benign	0.15
Sift	Benign	0.065	T
Sift4G	Benign	0.44	T
Polyphen		0.92	P
Vest4		0.53
MutPred		0.62		Loss of disorder (P = 0.0416)
MVP		0.79
MPC		0.84
ClinPred		0.96	D
GERP RS		3.6
Varity_R		0.55
gMVP		0.71

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

Other links and lift over

dbSNP: rs752301570; hg19: chr16-2550856;