Genetic Variant TUBA8:c.1056+1422A>G (chr22-18128456-A-G) – ACMG Classification: Benign (-12 pts)

Variant summary

Our verdict is Benign. The variant received -12 ACMG points: 0P and 12B. BP4_StrongBA1

The NM_018943.3(TUBA8):c.1056+1422A>G variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.396 in 152,090 control chromosomes in the GnomAD database, including 17,433 homozygotes. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

Frequency

Genomes: 𝑓 0.40 ( 17433 hom., cov: 32)

Exomes 𝑓: 0.0 ( 0 hom. )

Failed GnomAD Quality Control

Consequence

TUBA8
NM_018943.3 intron

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: -0.515

Publications

9 publications found

Variant links:

Genes affected

TUBA8 (HGNC:12410): (tubulin alpha 8) This gene encodes a member of the alpha tubulin protein family. Alpha tubulins are one of two core protein families (alpha and beta tubulins) that heterodimerize and assemble to form microtubules. Mutations in this gene are associated with polymicrogyria and optic nerve hypoplasia. Alternate splicing results in multiple transcript variants. [provided by RefSeq, Jul 2010]

TUBA8 Gene-Disease associations (from GenCC):

polymicrogyria with optic nerve hypoplasia
Inheritance: Unknown, AR Classification: SUPPORTIVE, LIMITED, NO_KNOWN Submitted by: Labcorp Genetics (formerly Invitae), G2P, Orphanet, ClinGen

TUBA8 links:

ENSG00000288683 (HGNC:):

ENSG00000288683 links:

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ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -12 ACMG points.

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.97).

BA1

GnomAd4 highest subpopulation (AFR) allele frequency at 95% confidence interval = 0.785 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
TUBA8	NM_018943.3 link	c.1056+1422A>G		intron_variant	Intron 4 of 4	ENST00000330423.8	NP_061816.1	Q9NY65-1
TUBA8	NM_001193414.2 link	c.858+1422A>G		intron_variant	Intron 4 of 4		NP_001180343.1	Q9NY65-2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
TUBA8	ENST00000330423.8 link	c.1056+1422A>G		intron_variant	Intron 4 of 4	1	NM_018943.3	ENSP00000333326.3		Q9NY65-1
ENSG00000288683	ENST00000474897.6 link	n.*946+1422A>G		intron_variant	Intron 8 of 8	5		ENSP00000434235.2		E9PRC5

Frequencies

GnomAD3 genomes

AF:

0.395

AC:

60087

AN:

151972

Hom.:

17377

Cov.:

show subpopulations

Gnomad AFR

AF:

0.792

Gnomad AMI

AF:

0.116

Gnomad AMR

AF:

0.382

Gnomad ASJ

AF:

0.224

Gnomad EAS

AF:

0.674

Gnomad SAS

AF:

0.389

Gnomad FIN

AF:

0.172

Gnomad MID

AF:

0.239

Gnomad NFE

AF:

0.185

Gnomad OTH

AF:

0.349

GnomAD4 exome

Data not reliable, filtered out with message: AC0

AF:

0.00

AC:

AN:

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

African (AFR)

AC:

AN:

American (AMR)

AC:

AN:

Ashkenazi Jewish (ASJ)

AC:

AN:

East Asian (EAS)

AC:

AN:

South Asian (SAS)

AC:

AN:

European-Finnish (FIN)

AF:

0.00

AC:

AN:

Middle Eastern (MID)

AC:

AN:

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

Other (OTH)

AF:

0.00

AC:

AN:

GnomAD4 genome

AF:

0.396

AC:

60205

AN:

152090

Hom.:

17433

Cov.:

AF XY:

0.396

AC XY:

29438

AN XY:

74356

show subpopulations

African (AFR)

AF:

0.792

AC:

32903

AN:

41518

American (AMR)

AF:

0.383

AC:

5848

AN:

15280

Ashkenazi Jewish (ASJ)

AF:

0.224

AC:

775

AN:

3466

East Asian (EAS)

AF:

0.673

AC:

3480

AN:

5168

South Asian (SAS)

AF:

0.389

AC:

1873

AN:

4816

European-Finnish (FIN)

AF:

0.172

AC:

1818

AN:

10570

Middle Eastern (MID)

AF:

0.233

AC:

AN:

292

European-Non Finnish (NFE)

AF:

0.185

AC:

12589

AN:

67956

Other (OTH)

AF:

0.353

AC:

745

AN:

2112

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.504

Heterozygous variant carriers

1340

2680

4021

5361

6701

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Genome Hom

Variant carriers

506

1012

1518

2024

2530

<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:

0.262

Hom.:

17423

Bravo

AF:

0.430

Asia WGS

AF:

0.549

AC:

1905

AN:

3478

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.97

CADD

Benign

0.59

(source)

DANN

Benign

0.37

PhyloP100

-0.52

Mutation Taster

=100/0

polymorphism (auto)

(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