rs62321379

Variant names:

• chr4-106171272-T-C
• rs62321379
• NM_001163435.3:c.2060-2A>G

Variant summary

Our verdict is Pathogenic. The variant received 18 ACMG points: 18P and 0B. PVS1 PM2 PP5_Very_Strong

The NM_001163435.3(TBCK):​c.2060-2A>G variant causes a splice acceptor, intron change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.0000476 in 1,596,602 control chromosomes in the GnomAD database, with no homozygous occurrence. 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 Likely pathogenic (★★).

• Frequency:
  • Genomes: 𝑓 0.000059 (0 hom., cov: 32)
  • Exomes 𝑓: 0.000046 (0 hom.)
• Consequence: TBCK NM_001163435.3 splice_acceptor, intron
• Scores: Splicing: ADA: 1.000
• Clinical Significance: Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:6
• Conservation: PhyloP100: 7.81
• Publications: 5 publications found

Genes affected

TBCK (HGNC:28261): (TBC1 domain containing kinase) This gene encodes a protein that contains a protein kinase domain, a Rhodanase-like domain and the Tre-2/Bub2/Cdc16 (TBC) domain. The encoded protein is thought to play a role in actin organization, cell growth and cell proliferation by regulating the mammalian target of the rapamycin (mTOR) signaling pathway. This protein may also be involved in the transcriptional regulation of the components of the mTOR complex. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Mar 2014]

TBCK Gene-Disease associations (from GenCC):

• hypotonia, infantile, with psychomotor retardation and characteristic facies 3

  Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: Labcorp Genetics (formerly Invitae), G2P, PanelApp Australia
• syndromic complex neurodevelopmental disorder

  Inheritance: AR Classification: DEFINITIVE Submitted by: ClinGen

ACMG classification

Our verdict: Pathogenic. The variant received 18 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 4-106171272-T-C is Pathogenic according to our data. Variant chr4-106171272-T-C is described in ClinVar as Pathogenic/Likely_pathogenic. ClinVar VariationId is 225239.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001163435.3. 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
	TBCK	NM_001163435.3	MANE Select	c.2060-2A>G		splice_acceptor intron	N/A	NP_001156907.2	Q8TEA7-1
	TBCK	NM_001163436.4		c.2060-2A>G		splice_acceptor intron	N/A	NP_001156908.2	Q8TEA7-1
	TBCK	NM_001163437.3		c.1943-2A>G		splice_acceptor intron	N/A	NP_001156909.2	Q8TEA7-2

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	TBCK	ENST00000394708.7	TSL:1 MANE Select	c.2060-2A>G		splice_acceptor intron	N/A	ENSP00000378198.2	Q8TEA7-1
	TBCK	ENST00000394706.7	TSL:1	c.1943-2A>G		splice_acceptor intron	N/A	ENSP00000378196.3	Q8TEA7-2
	TBCK	ENST00000361687.8	TSL:1	c.1871-2A>G		splice_acceptor intron	N/A	ENSP00000355338.4	Q8TEA7-3

Frequencies

GnomAD3 genomes AF: 0.0000592 AC: 9 AN: 152124 Hom.: 0 Cov.: 32

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: 0.000132

Gnomad OTH AF: 0.00

GnomAD2 exomes AF: 0.0000299 AC: 7 AN: 234102 AF XY: 0.0000158

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: 0.0000551

Gnomad OTH exome AF: 0.000179

GnomAD4 exome AF: 0.0000464 AC: 67 AN: 1444478 Hom.: 0 Cov.: 30 AF XY: 0.0000390 AC XY: 28 AN XY: 717922

African (AFR) AF: 0.00 AC: 0 AN: 32562

American (AMR) AF: 0.00 AC: 0 AN: 40288

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 25724

East Asian (EAS) AF: 0.00 AC: 0 AN: 39038

South Asian (SAS) AF: 0.00 AC: 0 AN: 81878

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53324

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5708

European-Non Finnish (NFE) AF: 0.0000560 AC: 62 AN: 1106196

Other (OTH) AF: 0.0000837 AC: 5 AN: 59760

GnomAD4 genome AF: 0.0000592 AC: 9 AN: 152124 Hom.: 0 Cov.: 32 AF XY: 0.0000538 AC XY: 4 AN XY: 74294

African (AFR) AF: 0.00 AC: 0 AN: 41436

American (AMR) AF: 0.00 AC: 0 AN: 15254

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3472

East Asian (EAS) AF: 0.00 AC: 0 AN: 5188

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

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10608

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 316

European-Non Finnish (NFE) AF: 0.000132 AC: 9 AN: 68014

Other (OTH) AF: 0.00 AC: 0 AN: 2094

Alfa AF: 0.0000787 Hom.: 0

Bravo AF: 0.0000718

ESP6500AA AF: 0.00 AC: 0

ESP6500EA AF: 0.000116 AC: 1

ExAC AF: 0.0000165 AC: 2

ClinVar

ClinVar submissions

Significance: Pathogenic/Likely pathogenic

Revision: criteria provided, multiple submitters, no conflicts

Pathogenic	VUS	Benign	Condition
4	-	-	Hypotonia, infantile, with psychomotor retardation and characteristic facies 3 (4)
2	-	-	not provided (2)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.53	D
BayesDel_noAF	Pathogenic	0.33
CADD	Pathogenic	29
DANN	Uncertain	0.99
Eigen	Pathogenic	1.1
Eigen_PC	Pathogenic	0.92
FATHMM_MKL	Uncertain	0.96	D
PhyloP100		7.8
GERP RS		5.0
Mutation Taster		=0/100	disease causing (ClinVar)

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Pathogenic	1.0
dbscSNV1_RF	Pathogenic	0.92
SpliceAI score (max)		0.99		Details are displayed if max score is > 0.2
DS_AL_spliceai		0.99		Position offset: -2

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

Other links and lift over

dbSNP: rs62321379; hg19: chr4-107092429;