rs398123047

Variant names:

• chr17-42614407-A-C
• rs398123047
• NM_001070.5:c.991A>C
• TUBG1 p.Thr331Pro

Variant summary

Our verdict is Likely pathogenic. The variant received 6 ACMG points: 6P and 0B. PM2 PP2 PP3_Moderate PP5

The NM_001070.5(TUBG1):​c.991A>C​(p.Thr331Pro) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Pathogenic (no stars).

• Frequency: Genomes: not found (cov: 32)
• Consequence: TUBG1 NM_001070.5 missense
• Clinical Significance: Pathogenic no assertion criteria provided P:1
• Conservation: PhyloP100: 7.19
• Publications: 8 publications found

Genes affected

TUBG1 (HGNC:12417): (tubulin gamma 1) This gene encodes a member of the tubulin superfamily. The encoded protein localizes to the centrosome where it binds to microtubules as part of a complex referred to as the gamma-tubulin ring complex. The protein mediates microtubule nucleation and is required for microtubule formation and progression of the cell cycle. A pseudogene of this gene is found on chromosome 7. [provided by RefSeq, Jan 2009]

TUBG1 Gene-Disease associations (from GenCC):

• lissencephaly spectrum disorders

  Inheritance: AD Classification: DEFINITIVE Submitted by: ClinGen
• complex cortical dysplasia with other brain malformations 4

  Inheritance: AD Classification: STRONG, MODERATE Submitted by: Labcorp Genetics (formerly Invitae), Ambry Genetics

ACMG classification

Our verdict: Likely_pathogenic. The variant received 6 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant in the TUBG1 gene, where missense mutations are typically associated with disease (based on misZ statistic). The gene has 11 curated pathogenic missense variants (we use a threshold of 10). The gene has 3 curated benign missense variants. Gene score misZ: 4.1551 (above the threshold of 3.09). Trascript score misZ: 5.8568 (above the threshold of 3.09). GenCC associations: The gene is linked to complex cortical dysplasia with other brain malformations 4, lissencephaly spectrum disorders.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.928
• PP5: Variant 17-42614407-A-C is Pathogenic according to our data. Variant chr17-42614407-A-C is described in ClinVar as Pathogenic. ClinVar VariationId is 65399.Status of the report is no_assertion_criteria_provided, 0 stars.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001070.5. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	TUBG1	NM_001070.5	MANE Select	c.991A>C	p.Thr331Pro	missense	Exon 9 of 11	NP_001061.2

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	TUBG1	ENST00000251413.8	TSL:1 MANE Select	c.991A>C	p.Thr331Pro	missense	Exon 9 of 11	ENSP00000251413.2	P23258
	TUBG1	ENST00000681413.1		c.1129A>C	p.Thr377Pro	missense	Exon 9 of 11	ENSP00000505664.1	A0A7P0T9G6
	TUBG1	ENST00000951125.1		c.988A>C	p.Thr330Pro	missense	Exon 9 of 11	ENSP00000621184.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 32

ClinVar

ClinVar submissions

Significance: Pathogenic

Revision: no assertion criteria provided

Pathogenic	VUS	Benign	Condition
1	-	-	Complex cortical dysplasia with other brain malformations 4 (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.79
BayesDel_addAF	Pathogenic	0.32	D
BayesDel_noAF	Pathogenic	0.22
CADD	Pathogenic	28
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.88	D
Eigen	Pathogenic	0.81
Eigen_PC	Pathogenic	0.71
FATHMM_MKL	Pathogenic	1.0	D
LIST_S2	Uncertain	0.96	D
M_CAP	Pathogenic	0.83	D
MetaRNN	Pathogenic	0.93	D
MetaSVM	Pathogenic	0.80	D
MutationAssessor	Pathogenic	3.3	M
PhyloP100		7.2
PrimateAI	Pathogenic	0.79	T
PROVEAN	Pathogenic	-4.8	D
REVEL	Pathogenic	0.92
Sift	Uncertain	0.0060	D
Sift4G	Benign	0.072	T
Varity_R		0.96
gMVP		0.98
Mutation Taster		=4/96	disease causing (ClinVar)

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.020		Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

MaxEntScan Visualizer can be used to analyze the impact of this mutation on the neighboring sequence.

Other links and lift over

dbSNP: rs398123047;

hg19: chr17-40766425;