rs1057519630

Variant names:

• chr16-2496552-C-T
• rs1057519630
• NM_001199107.2:c.404C>T

Variant summary

Our verdict is Uncertain significance. The variant received 3 ACMG points: 3P and 0B. PP3_Moderate PP5

The NM_001199107.2(TBC1D24):​c.404C>T​(p.Pro135Leu) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000412 in 1,456,196 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 Conflicting classifications of pathogenicity (no stars). Synonymous variant affecting the same amino acid position (i.e. P135P) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000041 (0 hom.)
• Consequence: TBC1D24 NM_001199107.2 missense
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:3 U:1 O:1
• Conservation: PhyloP100: 7.89
• Publications: 4 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 3 ACMG points.

• PP3: MetaRNN computational evidence supports a deleterious effect, 0.882
• PP5: Variant 16-2496552-C-T is Pathogenic according to our data. Variant chr16-2496552-C-T is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 375708.

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.404C>T	p.Pro135Leu	missense	Exon 2 of 8	NP_001186036.1	Q9ULP9-1
	TBC1D24	NM_020705.3		c.404C>T	p.Pro135Leu	missense	Exon 2 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.404C>T	p.Pro135Leu	missense	Exon 2 of 8	ENSP00000494678.1	Q9ULP9-1
	TBC1D24	ENST00000567020.7	TSL:1	c.404C>T	p.Pro135Leu	missense	Exon 2 of 7	ENSP00000454408.1	Q9ULP9-2
	ENSG00000260272	ENST00000564543.1	TSL:2	c.404C>T	p.Pro135Leu	missense	Exon 1 of 3	ENSP00000455547.1	H3BQ06

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD2 exomes AF: 0.00000409 AC: 1 AN: 244512 AF XY: 0.00000749

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: 0.00000891

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000412 AC: 6 AN: 1456196 Hom.: 0 Cov.: 31 AF XY: 0.00000276 AC XY: 2 AN XY: 724844

African (AFR) AF: 0.00 AC: 0 AN: 33480

American (AMR) AF: 0.00 AC: 0 AN: 44716

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26120

East Asian (EAS) AF: 0.00 AC: 0 AN: 39692

South Asian (SAS) AF: 0.0000232 AC: 2 AN: 86254

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 47860

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

European-Non Finnish (NFE) AF: 0.00000360 AC: 4 AN: 1111950

Other (OTH) AF: 0.00 AC: 0 AN: 60356

GnomAD4 genome Cov.: 33

Alfa AF: 0.0000283 Hom.: 0

Bravo AF: 0.00000378

ClinVar

ClinVar submissions

Significance: Conflicting classifications of pathogenicity

Revision: criteria provided, conflicting classifications

Pathogenic	VUS	Benign	Condition
1	-	-	Autosomal dominant epilepsy (1)
1	-	-	Developmental and epileptic encephalopathy, 1;C3892048:Autosomal dominant nonsyndromic hearing loss 65;CN236805:Caused by mutation in the TBC1 domain family, member 24 (1)
-	1	-	Inborn genetic diseases (1)
1	-	-	Parkinsonian disorder (1)
-	-	-	DOORS syndrome (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.69
BayesDel_addAF	Pathogenic	0.20	D
BayesDel_noAF	Uncertain	0.060
CADD	Pathogenic	31
DANN	Uncertain	1.0
DEOGEN2	Benign	0.10	T
Eigen	Pathogenic	0.70
Eigen_PC	Pathogenic	0.68
FATHMM_MKL	Pathogenic	0.97	D
LIST_S2	Uncertain	0.97	D
M_CAP	Pathogenic	0.69	D
MetaRNN	Pathogenic	0.88	D
MetaSVM	Benign	-1.1	T
MutationAssessor	Uncertain	2.7	M
PhyloP100		7.9
PrimateAI	Uncertain	0.72	T
PROVEAN	Uncertain	-3.3	D
REVEL	Uncertain	0.51
Sift	Benign	0.25	T
Sift4G	Pathogenic	0.0	D
Polyphen		1.0	D
Vest4		0.94
MutPred		0.73		Gain of helix (P = 0.132)
MVP		0.77
MPC		1.1
ClinPred		0.97	D
GERP RS		5.6
Varity_R		0.21
gMVP		0.86
Mutation Taster		=23/77	disease causing

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: rs1057519630; hg19: chr16-2546553;