Genetic Variant TBCD:p.Tyr760* (chr17-82924958-C-A) – ACMG Classification: Pathogenic (18 pts)

Variant summary

Our verdict is Pathogenic. The variant received 18 ACMG points: 18P and 0B. PVS1PM2PP5_Very_Strong

The NM_005993.5(TBCD):c.2280C>A(p.Tyr760*) variant causes a stop gained change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000706 in 1,416,022 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 Pathogenic (★★). Variant results in nonsense mediated mRNA decay.

Frequency

Genomes: not found (cov: 33)

Exomes 𝑓: 7.1e-7 ( 0 hom. )

Consequence

TBCD
NM_005993.5 stop_gained

Scores

Clinical Significance

Pathogenic criteria provided, multiple submitters, no conflicts P:3

Conservation

PhyloP100: -1.01

Publications

2 publications found

Variant links:

Genes affected

TBCD (HGNC:11581): (tubulin folding cofactor D) Cofactor D is one of four proteins (cofactors A, D, E, and C) involved in the pathway leading to correctly folded beta-tubulin from folding intermediates. Cofactors A and D are believed to play a role in capturing and stabilizing beta-tubulin intermediates in a quasi-native confirmation. Cofactor E binds to the cofactor D/beta-tubulin complex; interaction with cofactor C then causes the release of beta-tubulin polypeptides that are committed to the native state. [provided by RefSeq, Jul 2008]

TBCD Gene-Disease associations (from GenCC):

early-onset progressive diffuse brain atrophy-microcephaly-muscle weakness-optic atrophy syndrome
Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: G2P, Orphanet, Labcorp Genetics (formerly Invitae)

TBCD links:

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ACMG classification

Classification was made for transcript

Our verdict: Pathogenic. The variant received 18 ACMG points.

PVS1

Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.

PM2

Very rare variant in population databases, with high coverage;

PP5

Variant 17-82924958-C-A is Pathogenic according to our data. Variant chr17-82924958-C-A is described in ClinVar as Pathogenic. ClinVar VariationId is 268170.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_005993.5. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein
TBCD	NM_005993.5	MANE Select	c.2280C>A	p.Tyr760*	stop_gained	Exon 27 of 39	NP_005984.3
TBCD	NM_001411101.1		c.2229C>A	p.Tyr743*	stop_gained	Exon 26 of 38	NP_001398030.1
TBCD	NM_001411102.1		c.2199C>A	p.Tyr733*	stop_gained	Exon 26 of 38	NP_001398031.1

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein
TBCD	ENST00000355528.9	TSL:1 MANE Select	c.2280C>A	p.Tyr760*	stop_gained	Exon 27 of 39	ENSP00000347719.4
TBCD	ENST00000571796.5	TSL:1	n.938C>A		non_coding_transcript_exon	Exon 12 of 17
TBCD	ENST00000576677.6	TSL:1	n.1409C>A		non_coding_transcript_exon	Exon 5 of 16

Frequencies

GnomAD3 genomes

Cov.:

GnomAD2 exomes

AF:

0.00

AC:

AN:

182692

AF XY:

0.00

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:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

7.06e-7

AC:

AN:

1416022

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

700146

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

32426

American (AMR)

AF:

0.00

AC:

AN:

38494

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

25440

East Asian (EAS)

AF:

0.0000268

AC:

AN:

37260

South Asian (SAS)

AF:

0.00

AC:

AN:

80346

European-Finnish (FIN)

AF:

0.00

AC:

AN:

50250

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5722

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

1087396

Other (OTH)

AF:

0.00

AC:

AN:

58688

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.575

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

Cov.:

ExAC

AF:

0.00000842

AC:

ClinVar

ClinVar submissions as Germline

Significance:Pathogenic

Revision:criteria provided, multiple submitters, no conflicts

View on ClinVar

Pathogenic

VUS

Benign

Condition

not provided (2)

Early-onset progressive diffuse brain atrophy-microcephaly-muscle weakness-optic atrophy syndrome (1)

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

BayesDel_addAF

Pathogenic

0.63

BayesDel_noAF

Uncertain

0.070

CADD

Pathogenic

(source)

DANN

Benign

0.97

Eigen

Benign

-0.36

Eigen_PC

Benign

-0.80

FATHMM_MKL

Benign

0.16

PhyloP100

-1.0

Vest4

0.95

GERP RS

-5.5

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

2.8

Mutation Taster

=0/200

disease causing (ClinVar)

(source)

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

Publications

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

ClinVar

Computational scores

Splicing

Publications

Other links and lift over