NM_020988.3:c.76G>A

Variant names:

• chr16-56192311-G-A
• rs2143270433
• NM_020988.3:c.76G>A

Variant summary

Our verdict is Uncertain significance. The variant received 4 ACMG points: 4P and 0B. PM1 PM2

The NM_020988.3(GNAO1):​c.76G>A​(p.Asp26Asn) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 31)
• Consequence: GNAO1 NM_020988.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 9.53
• Publications: 0 publications found

Genes affected

GNAO1 (HGNC:4389): (G protein subunit alpha o1) The protein encoded by this gene represents the alpha subunit of the Go heterotrimeric G-protein signal-transducing complex. Defects in this gene are a cause of early-onset epileptic encephalopathy. Two transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Aug 2015]

GNAO1-DT (HGNC:27543): (GNAO1 divergent transcript)

ACMG classification

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

• PM1: In a hotspot region, there are 2 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 5 uncertain in NM_020988.3
• PM2: Very rare variant in population databases, with high coverage

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_020988.3. 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
	GNAO1	NM_020988.3	MANE Select	c.76G>A	p.Asp26Asn	missense	Exon 1 of 9	NP_066268.1	P09471-1
	GNAO1	NM_138736.3		c.76G>A	p.Asp26Asn	missense	Exon 1 of 8	NP_620073.2	P09471-2

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	GNAO1	ENST00000262493.12	TSL:1 MANE Select	c.76G>A	p.Asp26Asn	missense	Exon 1 of 9	ENSP00000262493.6	P09471-1
	GNAO1	ENST00000262494.13	TSL:1	c.76G>A	p.Asp26Asn	missense	Exon 1 of 8	ENSP00000262494.7	P09471-2
	GNAO1	ENST00000638705.1	TSL:1	c.76G>A	p.Asp26Asn	missense	Exon 1 of 8	ENSP00000491223.1	P09471-1

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome Cov.: 29

GnomAD4 genome Cov.: 31

ClinVar

ClinVar submissions

Significance: Uncertain significance

Revision: criteria provided, single submitter

Pathogenic	VUS	Benign	Condition
-	1	-	Developmental and epileptic encephalopathy (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.73
BayesDel_addAF	Uncertain	0.066	T
BayesDel_noAF	Benign	-0.14
CADD	Pathogenic	32
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.86	D
Eigen	Uncertain	0.34
Eigen_PC	Uncertain	0.43
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Pathogenic	0.99	D
M_CAP	Pathogenic	0.49	D
MetaRNN	Uncertain	0.73	D
MetaSVM	Uncertain	0.54	D
MutationAssessor	Uncertain	2.9	M
PhyloP100		9.5
PrimateAI	Pathogenic	0.87	D
PROVEAN	Uncertain	-2.7	D
REVEL	Pathogenic	0.65
Sift	Uncertain	0.0060	D
Sift4G	Uncertain	0.027	D
Polyphen		0.039	B
Vest4		0.61
MutPred		0.61		Gain of MoRF binding (P = 0.0363)
MVP		0.87
MPC		1.6
ClinPred		0.99	D
GERP RS		4.8
PromoterAI		-0.046	Neutral
Varity_R		0.77
gMVP		0.97

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: rs2143270433; hg19: chr16-56226223;