Genetic Variant TUBG2:p.Ile432Thr (chr17-42666739-T-C) – ACMG Classification: Likely_benign (-4 pts)

Variant summary

Our verdict is Likely benign. The variant received -4 ACMG points: 0P and 4B. BP4_Strong

The NM_016437.3(TUBG2):c.1295T>C(p.Ile432Thr) variant causes a missense change. The variant allele was found at a frequency of 0.000191 in 1,614,114 control chromosomes in the GnomAD database, including 1 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: 𝑓 0.00044 ( 0 hom., cov: 32)

Exomes 𝑓: 0.00017 ( 1 hom. )

Consequence

TUBG2
NM_016437.3 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 6.15

Publications

2 publications found

Variant links:

Genes affected

TUBG2 (HGNC:12419): (tubulin gamma 2) Predicted to enable GTP binding activity. Predicted to be a structural constituent of cytoskeleton. Predicted to be involved in microtubule cytoskeleton organization and mitotic sister chromatid segregation. Located in microtubule. [provided by Alliance of Genome Resources, Apr 2022]

TUBG2 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Likely_benign. The variant received -4 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.06383222).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
TUBG2	NM_016437.3 link	c.1295T>C	p.Ile432Thr	missense_variant	Exon 11 of 11	ENST00000251412.8	NP_057521.1	Q9NRH3
TUBG2	NM_001320509.2 link	c.1322T>C	p.Ile441Thr	missense_variant	Exon 12 of 12		NP_001307438.1	A0A1B4Z394
TUBG2	XM_047435757.1 link	c.836T>C	p.Ile279Thr	missense_variant	Exon 8 of 8		XP_047291713.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
TUBG2	ENST00000251412.8 link	c.1295T>C	p.Ile432Thr	missense_variant	Exon 11 of 11	1	NM_016437.3	ENSP00000251412.6		Q9NRH3
TUBG2	ENST00000588870.1 link	n.1693T>C		non_coding_transcript_exon_variant	Exon 9 of 9	1

Frequencies

GnomAD3 genomes

AF:

0.000440

AC:

AN:

152108

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000483

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00105

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.000193

Gnomad SAS

AF:

0.000207

Gnomad FIN

AF:

0.00273

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.000265

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.000318

AC:

AN:

251488

AF XY:

0.000338

show subpopulations

Gnomad AFR exome

AF:

0.0000615

Gnomad AMR exome

AF:

0.000145

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00162

Gnomad NFE exome

AF:

0.000308

Gnomad OTH exome

AF:

0.000163

GnomAD4 exome

AF:

0.000166

AC:

242

AN:

1461888

Hom.:

Cov.:

AF XY:

0.000171

AC XY:

124

AN XY:

727244

show subpopulations

African (AFR)

AF:

0.0000299

AC:

AN:

33480

American (AMR)

AF:

0.000112

AC:

AN:

44724

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26136

East Asian (EAS)

AF:

0.0000252

AC:

AN:

39700

South Asian (SAS)

AF:

0.0000696

AC:

AN:

86258

European-Finnish (FIN)

AF:

0.00195

AC:

104

AN:

53420

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5768

European-Non Finnish (NFE)

AF:

0.000104

AC:

116

AN:

1112006

Other (OTH)

AF:

0.000149

AC:

AN:

60396

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.470

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

AF:

0.000440

AC:

AN:

152226

Hom.:

Cov.:

AF XY:

0.000645

AC XY:

AN XY:

74448

show subpopulations

African (AFR)

AF:

0.0000482

AC:

AN:

41536

American (AMR)

AF:

0.00105

AC:

AN:

15302

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3470

East Asian (EAS)

AF:

0.000193

AC:

AN:

5172

South Asian (SAS)

AF:

0.000207

AC:

AN:

4828

European-Finnish (FIN)

AF:

0.00273

AC:

AN:

10612

Middle Eastern (MID)

AF:

0.00

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.000265

AC:

AN:

67988

Other (OTH)

AF:

0.00

AC:

AN:

2114

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.508

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Alfa

AF:

0.000214

Hom.:

Bravo

AF:

0.000128

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.000116

AC:

ExAC

AF:

0.000329

AC:

Asia WGS

AF:

0.000289

AC:

AN:

3478

EpiCase

AF:

0.000164

EpiControl

AF:

0.0000593

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Feb 06, 2023

Ambry Genetics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The c.1295T>C (p.I432T) alteration is located in exon 11 (coding exon 11) of the TUBG2 gene. This alteration results from a T to C substitution at nucleotide position 1295, causing the isoleucine (I) at amino acid position 432 to be replaced by a threonine (T). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.17

BayesDel_addAF

Benign

-0.13

BayesDel_noAF

Uncertain

-0.070

CADD

Benign

(source)

DANN

Uncertain

0.99

DEOGEN2

Uncertain

0.52

Eigen

Benign

0.073

Eigen_PC

Benign

0.13

FATHMM_MKL

Uncertain

0.93

LIST_S2

Pathogenic

0.98

M_CAP

Uncertain

0.13

MetaRNN

Benign

0.064

MetaSVM

Uncertain

0.11

MutationAssessor

Uncertain

2.2

PhyloP100

6.1

PrimateAI

Uncertain

0.68

PROVEAN

Uncertain

-2.6

REVEL

Uncertain

0.56

Sift

Uncertain

0.026

Sift4G

Uncertain

0.018

Polyphen

0.0050

Vest4

0.64

MVP

0.79

MPC

1.2

ClinPred

0.094

GERP RS

4.0

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.0

Varity_R

0.17

gMVP

0.48

Mutation Taster

=97/3

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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17-42666739-T-C

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