17-82921536-C-T

Variant names:

Variant summary

Our verdict is Benign. The variant received -9 ACMG points: 0P and 9B. BP4_StrongBP6BS1

The NM_005993.5(TBCD):c.2137C>T(p.His713Tyr) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000483 in 1,614,046 control chromosomes in the GnomAD database, including 1 homozygotes. In-silico tool predicts a benign outcome for this variant. 16/22 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. H713D) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.00026 ( 0 hom., cov: 33)

Exomes 𝑓: 0.000027 ( 1 hom. )

Consequence

TBCD
NM_005993.5 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:1B:1

Conservation

PhyloP100: 2.46

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:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -9 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.063402176).

BP6

Variant 17-82921536-C-T is Benign according to our data. Variant chr17-82921536-C-T is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 2058015.

BS1

Variant frequency is greater than expected in population afr. GnomAd4 allele frequency = 0.000256 (39/152336) while in subpopulation AFR AF = 0.000914 (38/41582). AF 95% confidence interval is 0.000684. There are 0 homozygotes in GnomAd4. There are 19 alleles in the male GnomAd4 subpopulation. Median coverage is 33. This position passed quality control check.

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.2137C>T	p.His713Tyr	missense	Exon 25 of 39	NP_005984.3
TBCD	NM_001411101.1		c.2086C>T	p.His696Tyr	missense	Exon 24 of 38	NP_001398030.1
TBCD	NM_001411102.1		c.2056C>T	p.His686Tyr	missense	Exon 24 of 38	NP_001398031.1

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein
TBCD	ENST00000355528.9	TSL:1 MANE Select	c.2137C>T	p.His713Tyr	missense	Exon 25 of 39	ENSP00000347719.4
TBCD	ENST00000571796.5	TSL:1	n.795C>T		non_coding_transcript_exon	Exon 10 of 17
TBCD	ENST00000576677.6	TSL:1	n.1348C>T		non_coding_transcript_exon	Exon 4 of 16

Frequencies

GnomAD3 genomes

AF:

0.000237

AC:

AN:

152218

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000844

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.0000654

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:

0.00

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.0000682

AC:

AN:

249278

AF XY:

0.0000370

show subpopulations

Gnomad AFR exome

AF:

0.000775

Gnomad AMR exome

AF:

0.000116

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:

0.0000267

AC:

AN:

1461710

Hom.:

Cov.:

AF XY:

0.0000275

AC XY:

AN XY:

727138

show subpopulations

African (AFR)

AF:

0.000956

AC:

AN:

33480

American (AMR)

AF:

0.0000671

AC:

AN:

44724

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26136

East Asian (EAS)

AF:

0.00

AC:

AN:

39700

South Asian (SAS)

AF:

0.0000116

AC:

AN:

86258

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53402

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5768

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

1111868

Other (OTH)

AF:

0.0000497

AC:

AN:

60374

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.443

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Exome Hom

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.000256

AC:

AN:

152336

Hom.:

Cov.:

AF XY:

0.000255

AC XY:

AN XY:

74486

show subpopulations

African (AFR)

AF:

0.000914

AC:

AN:

41582

American (AMR)

AF:

0.0000654

AC:

AN:

15302

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3470

East Asian (EAS)

AF:

0.00

AC:

AN:

5186

South Asian (SAS)

AF:

0.00

AC:

AN:

4828

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10616

Middle Eastern (MID)

AF:

0.00

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

68032

Other (OTH)

AF:

0.00

AC:

AN:

2114

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.518

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

Alfa

AF:

0.000251

Hom.:

Bravo

AF:

0.000287

ESP6500AA

AF:

0.00140

AC:

ESP6500EA

AF:

0.00

AC:

ExAC

AF:

0.0000908

AC:

Asia WGS

AF:

0.000289

AC:

AN:

3478

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:1Benign:1

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

Inborn genetic diseases

Uncertain:1

Oct 12, 2021

Ambry Genetics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The c.2137C>T (p.H713Y) alteration is located in exon 25 (coding exon 25) of the TBCD gene. This alteration results from a C to T substitution at nucleotide position 2137, causing the histidine (H) at amino acid position 713 to be replaced by a tyrosine (Y). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear.

not provided

Benign:1

Dec 17, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.088

BayesDel_addAF

Benign

-0.41

BayesDel_noAF

Benign

-0.43

CADD

Benign

9.9

(source)

DANN

Benign

0.64

DEOGEN2

Benign

0.037

Eigen

Benign

-1.2

Eigen_PC

Benign

-1.2

FATHMM_MKL

Benign

0.029

LIST_S2

Uncertain

0.89

M_CAP

Benign

0.052

MetaRNN

Benign

0.063

MetaSVM

Benign

-1.0

MutationAssessor

Benign

0.69

PhyloP100

2.5

PrimateAI

Benign

0.30

PROVEAN

Benign

-1.0

REVEL

Benign

0.18

Sift

Benign

0.075

Sift4G

Benign

1.0

Polyphen

0.33

Vest4

0.18

MVP

0.41

MPC

0.35

ClinPred

0.013

GERP RS

2.7

Varity_R

0.028

gMVP

0.24

Mutation Taster

=93/7

polymorphism

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.060

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

Age Distribution

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over