chr16-2475188-G-T

Variant names:

• chr16-2475188-G-T
• rs1181532315
• NM_001199107.2:c.-116+18G>T

Variant summary

Our verdict is Likely benign. The variant received -4 ACMG points: 2P and 6B. PM2 BP4_Strong BP6_Moderate

The NM_001199107.2(TBC1D24):​c.-116+18G>T variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000672 in 148,816 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★).

• Frequency: Genomes: 𝑓 0.0000067 (0 hom., cov: 33)
• Consequence: TBC1D24 NM_001199107.2 intron
• Clinical Significance: Likely benign criteria provided, single submitter B:1
• Conservation: PhyloP100: -0.500
• 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

ACMG classification

Our verdict: Likely_benign. The variant received -4 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.9).
• BP6: Variant 16-2475188-G-T is Benign according to our data. Variant chr16-2475188-G-T is described in ClinVar as [Likely_benign]. Clinvar id is 668520.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
TBC1D24	NM_001199107.2	c.-116+18G>T		intron_variant	Intron 1 of 7	ENST00000646147.1	NP_001186036.1
TBC1D24	NM_020705.3	c.-116+18G>T		intron_variant	Intron 1 of 6		NP_065756.1
TBC1D24	XM_017023493.2	c.-116+18G>T		intron_variant	Intron 1 of 8		XP_016878982.1
TBC1D24	XM_017023495.2	c.-116+18G>T		intron_variant	Intron 1 of 7		XP_016878984.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
TBC1D24	ENST00000646147.1	c.-116+18G>T		intron_variant	Intron 1 of 7		NM_001199107.2	ENSP00000494678.1
TBC1D24	ENST00000567020.7	c.-116+18G>T		intron_variant	Intron 1 of 6	1		ENSP00000454408.1
TBC1D24	ENST00000569874.2	n.-116+18G>T		intron_variant	Intron 1 of 7	5		ENSP00000455005.2
TBC1D24	ENST00000630263.2	n.-142+18G>T		intron_variant	Intron 1 of 7	5		ENSP00000486835.1

Frequencies

GnomAD3 genomes AF: 0.00000672 AC: 1 AN: 148816 Hom.: 0 Cov.: 33

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.0000150

Gnomad OTH AF: 0.00

GnomAD4 exome Cov.: 0

GnomAD4 genome AF: 0.00000672 AC: 1 AN: 148816 Hom.: 0 Cov.: 33 AF XY: 0.0000138 AC XY: 1 AN XY: 72502

African (AFR) AF: 0.00 AC: 0 AN: 41076

American (AMR) AF: 0.00 AC: 0 AN: 14988

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3412

East Asian (EAS) AF: 0.00 AC: 0 AN: 5166

South Asian (SAS) AF: 0.00 AC: 0 AN: 4830

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 9374

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 314

European-Non Finnish (NFE) AF: 0.0000150 AC: 1 AN: 66696

Other (OTH) AF: 0.00 AC: 0 AN: 2048

Alfa AF: 0.00 Hom.: 0

Bravo AF: 0.00000756

ClinVar

Significance: Likely benign

Submissions summary: Benign:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Benign:1

May 22, 2018

GeneDx

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant is considered likely benign or benign based on one or more of the following criteria: it is a conservative change, it occurs at a poorly conserved position in the protein, it is predicted to be benign by multiple in silico algorithms, and/or has population frequency not consistent with disease. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.90
CADD	Benign	11
DANN	Benign	0.55
PhyloP100		-0.50
PromoterAI		0.085	Neutral

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: rs1181532315; hg19: chr16-2525189;