NM_006086.4:c.1331C>T

Variant names:

Variant summary

Our verdict is Benign. The variant received -10 ACMG points: 1P and 11B. PP2BP4_ModerateBP6BS1BS2

The NM_006086.4(TUBB3):c.1331C>T(p.Ser444Leu) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000124 in 1,613,418 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 13/22 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Synonymous variant affecting the same amino acid position (i.e. S444S) has been classified as Likely benign.

Frequency

Genomes: 𝑓 0.0000066 ( 0 hom., cov: 33)

Exomes 𝑓: 0.000013 ( 0 hom. )

Consequence

TUBB3
NM_006086.4 missense

Scores

Clinical Significance

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

Conservation

PhyloP100: 2.80

Publications

3 publications found

Variant links:

Genes affected

TUBB3 (HGNC:20772): (tubulin beta 3 class III) This gene encodes a class III member of the beta tubulin protein family. Beta tubulins are one of two core protein families (alpha and beta tubulins) that heterodimerize and assemble to form microtubules. This protein is primarily expressed in neurons and may be involved in neurogenesis and axon guidance and maintenance. Mutations in this gene are the cause of congenital fibrosis of the extraocular muscles type 3. Alternate splicing results in multiple transcript variants. A pseudogene of this gene is found on chromosome 6. [provided by RefSeq, Oct 2010]

TUBB3 Gene-Disease associations (from GenCC):

complex cortical dysplasia with other brain malformations 1
Inheritance: AD Classification: STRONG, SUPPORTIVE Submitted by: Orphanet, G2P, Labcorp Genetics (formerly Invitae), Illumina
fibrosis of extraocular muscles, congenital, 3A, with or without extraocular involvement
Inheritance: AD Classification: STRONG Submitted by: G2P, Labcorp Genetics (formerly Invitae), Genomics England PanelApp
congenital fibrosis of extraocular muscles
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
tubulinopathy-associated dysgyria
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

TUBB3 links:

ENSG00000198211 (HGNC:):

ENSG00000198211 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -10 ACMG points.

PP2

Missense variant in the TUBB3 gene, where missense mutations are typically associated with disease (based on misZ statistic). The gene has 45 curated pathogenic missense variants (we use a threshold of 10). The gene has 6 curated benign missense variants. Gene score misZ: 4.5786 (above the threshold of 3.09). Trascript score misZ: 5.665 (above the threshold of 3.09). GenCC associations: The gene is linked to fibrosis of extraocular muscles, congenital, 3A, with or without extraocular involvement, tubulinopathy-associated dysgyria, congenital fibrosis of extraocular muscles, complex cortical dysplasia with other brain malformations 1.

BP4

Computational evidence support a benign effect (MetaRNN=0.14810053).

BP6

Variant 16-89935782-C-T is Benign according to our data. Variant chr16-89935782-C-T is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 160189.

BS1

Variant frequency is greater than expected in population sas. GnomAdExome4 allele frequency = 0.000013 (19/1461208) while in subpopulation SAS AF = 0.000174 (15/86248). AF 95% confidence interval is 0.000107. There are 0 homozygotes in GnomAdExome4. There are 14 alleles in the male GnomAdExome4 subpopulation. Median coverage is 32. This position passed quality control check.

BS2

High AC in GnomAdExome4 at 19 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
TUBB3	NM_006086.4 link	c.1331C>T	p.Ser444Leu	missense_variant	Exon 4 of 4	ENST00000315491.12	NP_006077.2	Q13509-1Q53G92
TUBB3	NM_001197181.2 link	c.1115C>T	p.Ser372Leu	missense_variant	Exon 4 of 4		NP_001184110.1	Q13509-2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
TUBB3	ENST00000315491.12 link	c.1331C>T	p.Ser444Leu	missense_variant	Exon 4 of 4	1	NM_006086.4	ENSP00000320295.7		Q13509-1
ENSG00000198211	ENST00000556922.1 link	c.2372C>T	p.Ser791Leu	missense_variant	Exon 5 of 5	2		ENSP00000451560.1		A0A0B4J269

Frequencies

GnomAD3 genomes

AF:

0.00000657

AC:

AN:

152210

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.000193

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:

0.0000160

AC:

AN:

250438

AF XY:

0.0000221

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.0000546

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000130

AC:

AN:

1461208

Hom.:

Cov.:

AF XY:

0.0000193

AC XY:

AN XY:

726882

show subpopulations

African (AFR)

AF:

0.0000299

AC:

AN:

33468

American (AMR)

AF:

0.00

AC:

AN:

44704

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26124

East Asian (EAS)

AF:

0.00

AC:

AN:

39700

South Asian (SAS)

AF:

0.000174

AC:

AN:

86248

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53054

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5758

European-Non Finnish (NFE)

AF:

0.00000180

AC:

AN:

1111780

Other (OTH)

AF:

0.0000166

AC:

AN:

60372

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.501

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome 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

GnomAD4 genome

AF:

0.00000657

AC:

AN:

152210

Hom.:

Cov.:

AF XY:

0.0000134

AC XY:

AN XY:

74352

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

41462

American (AMR)

AF:

0.00

AC:

AN:

15278

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3470

East Asian (EAS)

AF:

0.000193

AC:

AN:

5192

South Asian (SAS)

AF:

0.00

AC:

AN:

4834

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10620

Middle Eastern (MID)

AF:

0.00

AC:

AN:

316

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

68032

Other (OTH)

AF:

0.00

AC:

AN:

2094

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.425

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:

0.00

Hom.:

Bravo

AF:

0.00000378

ExAC

AF:

0.0000165

AC:

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:1Benign:1

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not provided

Uncertain:1

Aug 17, 2023

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This variant is present in population databases (rs587784504, gnomAD 0.01%). This sequence change replaces serine, which is neutral and polar, with leucine, which is neutral and non-polar, at codon 444 of the TUBB3 protein (p.Ser444Leu). This variant has not been reported in the literature in individuals affected with TUBB3-related conditions. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) has been performed at Invitae for this missense variant, however the output from this modeling did not meet the statistical confidence thresholds required to predict the impact of this variant on TUBB3 protein function. ClinVar contains an entry for this variant (Variation ID: 160189). -

not specified

Benign:1

Jun 04, 2014

Genetic Services Laboratory, University of Chicago

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.080

BayesDel_addAF

Benign

-0.083

BayesDel_noAF

Benign

-0.15

CADD

Uncertain

(source)

DANN

Uncertain

0.98

DEOGEN2

Benign

0.28

.;.;T

Eigen

Benign

-0.019

Eigen_PC

Benign

0.054

FATHMM_MKL

Benign

0.71

LIST_S2

Uncertain

0.90

D;D;D

M_CAP

Uncertain

0.13

MetaRNN

Benign

0.15

T;T;T

MetaSVM

Benign

-0.56

MutationAssessor

Benign

0.34

.;.;N

PhyloP100

2.8

PrimateAI

Uncertain

0.58

PROVEAN

Benign

-0.12

N;N;N

REVEL

Benign

0.27

Sift

Uncertain

0.0010

D;.;.

Sift4G

Uncertain

0.045

D;T;T

Polyphen

0.83

.;.;P

Vest4

0.14

MutPred

0.22

.;.;Loss of phosphorylation at S444 (P = 0.0029);

MVP

0.80

MPC

1.3

ClinPred

0.34

GERP RS

4.7

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.7

Varity_R

0.19

gMVP

0.84

Mutation Taster

=34/66

disease causing

(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

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over