NM_001199198.3:c.1687+1G>C

Variant names:

• chr3-100316188-G-C
• rs1553731603
• NM_001199198.3:c.1687+1G>C

Variant summary

Our verdict is Pathogenic. The variant received 12 ACMG points: 12P and 0B. PVS1 PM2 PP5_Moderate

The NM_001199198.3(TBC1D23):​c.1687+1G>C variant causes a splice donor, intron change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. 3/3 splice prediction tools predicting alterations to normal splicing. Variant has been reported in ClinVar as Pathogenic (★).

• Frequency: Genomes: not found (cov: 31)
• Consequence: TBC1D23 NM_001199198.3 splice_donor, intron
• Scores: Splicing: ADA: 1.000
• Clinical Significance: Pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 8.90
• Publications: 0 publications found

Genes affected

TBC1D23 (HGNC:25622): (TBC1 domain family member 23) Involved in brain development; retrograde transport, endosome to Golgi; and vesicle tethering to Golgi. Located in cytoplasmic vesicle and trans-Golgi network. Colocalizes with WASH complex. Implicated in pontocerebellar hypoplasia. [provided by Alliance of Genome Resources, Apr 2022]

TBC1D23 Gene-Disease associations (from GenCC):

• pontocerebellar hypoplasia, type 11

  Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: PanelApp Australia, G2P

ACMG classification

Our verdict: Pathogenic. The variant received 12 ACMG points.

• PVS1: Splicing +-2 bp (donor or acceptor) variant, LoF is a know mechanism of disease, No cryptic splice site detected. Exon removal results in frameshift change.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 3-100316188-G-C is Pathogenic according to our data. Variant chr3-100316188-G-C is described in ClinVar as Pathogenic. ClinVar VariationId is 930943.Status of the report is criteria_provided_single_submitter, 1 stars.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001199198.3. 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
	TBC1D23	NM_001199198.3	MANE Select	c.1687+1G>C		splice_donor intron	N/A	NP_001186127.1	Q9NUY8-1
	TBC1D23	NM_018309.5		c.1642+1G>C		splice_donor intron	N/A	NP_060779.2	Q9NUY8-2

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	TBC1D23	ENST00000394144.9	TSL:1 MANE Select	c.1687+1G>C		splice_donor intron	N/A	ENSP00000377700.4	Q9NUY8-1
	TBC1D23	ENST00000344949.9	TSL:1	c.1642+1G>C		splice_donor intron	N/A	ENSP00000340693.5	Q9NUY8-2
	TBC1D23	ENST00000963832.1		c.1687+1G>C		splice_donor intron	N/A	ENSP00000633891.1

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome Cov.: 28

GnomAD4 genome Cov.: 31

ClinVar

ClinVar submissions

Significance: Pathogenic

Revision: criteria provided, single submitter

Pathogenic	VUS	Benign	Condition
1	-	-	Pontocerebellar hypoplasia, type 11 (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.44	D
BayesDel_noAF	Pathogenic	0.39
CADD	Pathogenic	33
DANN	Uncertain	1.0
Eigen	Pathogenic	1.2
Eigen_PC	Pathogenic	1.1
FATHMM_MKL	Pathogenic	0.99	D
PhyloP100		8.9
GERP RS		5.1
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		2.7
Mutation Taster		=0/100	disease causing (ClinVar)

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Pathogenic	1.0
dbscSNV1_RF	Pathogenic	0.91
SpliceAI score (max)		0.84		Details are displayed if max score is > 0.2
DS_DL_spliceai		0.84		Position offset: -1

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Other links and lift over

dbSNP: rs1553731603; hg19: chr3-100035032;