Genetic Variant TUBA3E:p.Asp431Val (chr2-130191892-T-A) – ACMG Classification: Uncertain_significance (4 pts)

Variant summary

Our verdict is Uncertain significance. The variant received 4 ACMG points: 4P and 0B. PM2PP3_Moderate

The NM_207312.3(TUBA3E):c.1292A>T(p.Asp431Val) variant causes a missense change. The variant allele was found at a frequency of 0.0000132 in 152,026 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. D431G) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.000013 ( 0 hom., cov: 32)

Consequence

TUBA3E
NM_207312.3 missense

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: 5.59

Publications

3 publications found

Variant links:

Genes affected

TUBA3E (HGNC:20765): (tubulin alpha 3e) Microtubules of the eukaryotic cytoskeleton perform essential and diverse functions and are composed of a heterodimer of alpha and beta tubulin. The genes encoding these microtubule constituents are part of the tubulin superfamily, which is composed of six distinct families. Genes from the alpha, beta and gamma tubulin families are found in all eukaryotes. The alpha and beta tubulins represent the major components of microtubules, while gamma tubulin plays a critical role in the nucleation of microtubule assembly. This gene encodes an alpha tubulin that highly conserved among species. A missense mutation in this gene has been potentially linked to microlissencephaly and global developmental delay. [provided by RefSeq, Jul 2016]

TUBA3E links:

MZT2B (HGNC:25886): (mitotic spindle organizing protein 2B) Located in cytosol; microtubule cytoskeleton; and nucleoplasm. Part of gamma-tubulin large complex. [provided by Alliance of Genome Resources, Apr 2022]

MZT2B links:

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ACMG classification

Classification was made for transcript

Our verdict: Uncertain_significance. The variant received 4 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

PP3

MetaRNN computational evidence supports a deleterious effect, 0.91

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
TUBA3E	NM_207312.3 link	c.1292A>T	p.Asp431Val	missense_variant	Exon 5 of 5	ENST00000312988.9	NP_997195.2	Q6PEY2
MZT2B	XM_047445914.1 link	c.319+9117T>A		intron_variant	Intron 2 of 3		XP_047301870.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
TUBA3E	ENST00000312988.9 link	c.1292A>T	p.Asp431Val	missense_variant	Exon 5 of 5	1	NM_207312.3	ENSP00000318197.7		Q6PEY2

Frequencies

GnomAD3 genomes

AF:

0.0000132

AC:

AN:

152026

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:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000294

Gnomad OTH

AF:

0.00

GnomAD4 exome

Cov.:

GnomAD4 genome

AF:

0.0000132

AC:

AN:

152026

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

74246

show subpopulations

⚠️ The allele balance in gnomAD version 4 Genomes is significantly skewed from the expected value of 0.5.

African (AFR)

AF:

0.00

AC:

AN:

41404

American (AMR)

AF:

0.00

AC:

AN:

15266

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3470

East Asian (EAS)

AF:

0.00

AC:

AN:

5168

South Asian (SAS)

AF:

0.00

AC:

AN:

4826

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10576

Middle Eastern (MID)

AF:

0.00

AC:

AN:

316

European-Non Finnish (NFE)

AF:

0.0000294

AC:

AN:

68000

Other (OTH)

AF:

0.00

AC:

AN:

2088

⚠️ The allele balance in gnomAD version 4 Genomes is significantly skewed from the expected value of 0.5. (p-value = 0.000203), which strongly suggests a high chance of mosaicism in these individuals.

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.375

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.:

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.19

BayesDel_addAF

Pathogenic

0.28

BayesDel_noAF

Pathogenic

0.17

CADD

Benign

(source)

DANN

Uncertain

0.98

DEOGEN2

Benign

0.33

Eigen

Uncertain

0.52

Eigen_PC

Uncertain

0.34

FATHMM_MKL

Uncertain

0.92

LIST_S2

Pathogenic

0.98

M_CAP

Benign

0.061

MetaRNN

Pathogenic

0.91

MetaSVM

Uncertain

0.56

MutationAssessor

Pathogenic

4.3

PhyloP100

5.6

PrimateAI

Uncertain

0.72

PROVEAN

Pathogenic

-5.8

REVEL

Pathogenic

0.79

Sift4G

Uncertain

0.027

Polyphen

0.98

Vest4

0.84

MutPred

0.72

Gain of methylation at K430 (P = 0.0305);

MVP

0.89

ClinPred

1.0

GERP RS

2.5

Varity_R

0.85

gMVP

0.74

Mutation Taster

=79/21

polymorphism

(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

ClinVar

Computational scores

Splicing

Publications

Other links and lift over