NM_001070.5:c.275A>G

Variant names:

• chr17-42610535-A-G
• rs398123046
• NM_001070.5:c.275A>G

Variant summary

Our verdict is Likely pathogenic. The variant received 7 ACMG points: 7P and 0B. PM2 PP2 PP3_Moderate PP5_Moderate

The NM_001070.5(TUBG1):​c.275A>G​(p.Tyr92Cys) variant causes a missense change involving the alteration of a conserved nucleotide. 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 Likely pathogenic (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: TUBG1 NM_001070.5 missense
• Clinical Significance: Likely pathogenic criteria provided, single submitter P:2
• Conservation: PhyloP100: 9.26
• Publications: 11 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]

RETREG3 (HGNC:27258): (reticulophagy regulator family member 3) Involved in positive regulation of neuron projection development. Part of protein-containing complex. [provided by Alliance of Genome Resources, Apr 2022]

ACMG classification

Our verdict: Likely_pathogenic. The variant received 7 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, 0.867
• PP5: Variant 17-42610535-A-G is Pathogenic according to our data. Variant chr17-42610535-A-G is described in ClinVar as Likely_pathogenic. ClinVar VariationId is 65398.Status of the report is criteria_provided_single_submitter, 1 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.275A>G	p.Tyr92Cys	missense	Exon 3 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.275A>G	p.Tyr92Cys	missense	Exon 3 of 11	ENSP00000251413.2	P23258
	RETREG3	ENST00000585894.5	TSL:1	c.-53+2T>C		splice_donor intron	N/A	ENSP00000467847.1	K7EQI9
	TUBG1	ENST00000589613.1	TSL:1	n.184A>G		non_coding_transcript_exon	Exon 2 of 2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

ClinVar submissions

Significance: Likely pathogenic

Revision: criteria provided, single submitter

Pathogenic	VUS	Benign	Condition
2	-	-	Complex cortical dysplasia with other brain malformations 4 (2)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.50
BayesDel_addAF	Pathogenic	0.39	D
BayesDel_noAF	Pathogenic	0.32
CADD	Pathogenic	32
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.81	D
Eigen	Pathogenic	0.93
Eigen_PC	Pathogenic	0.90
FATHMM_MKL	Pathogenic	0.97	D
LIST_S2	Pathogenic	0.98	D
M_CAP	Pathogenic	0.41	D
MetaRNN	Pathogenic	0.87	D
MetaSVM	Uncertain	0.21	D
MutationAssessor	Pathogenic	3.5	H
PhyloP100		9.3
PrimateAI	Pathogenic	0.91	D
PROVEAN	Pathogenic	-6.0	D
REVEL	Pathogenic	0.80
Sift	Uncertain	0.0010	D
Sift4G	Uncertain	0.012	D
Polyphen		1.0	D
Vest4		0.95
MutPred		0.51		Loss of phosphorylation at Y92 (P = 0.0561)
MVP		0.86
MPC		3.2
ClinPred		0.99	D
GERP RS		5.8
PromoterAI		0.066	Neutral
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.88
gMVP		0.98
Mutation Taster		=0/100	disease causing (ClinVar)

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

Other links and lift over

dbSNP: rs398123046; hg19: chr17-40762553;