rs1297388989

Variant names:

Your query was ambiguous. Multiple possible variants found:

Variant summary

Our verdict is Likely pathogenic. The variant received 7 ACMG points: 7P and 0B. PM1PM2PP3_ModeratePP5

The NM_020988.3(GNAO1):c.604G>A(p.Val202Ile) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000000685 in 1,459,214 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Synonymous variant affecting the same amino acid position (i.e. V202V) has been classified as Likely benign.

Frequency

Genomes: not found (cov: 34)

Exomes 𝑓: 6.9e-7 ( 0 hom. )

Consequence

GNAO1
NM_020988.3 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:1U:2

Conservation

PhyloP100: 9.99

Publications

0 publications found

Variant links:

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 Gene-Disease associations (from GenCC):

developmental and epileptic encephalopathy, 17
Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: Labcorp Genetics (formerly Invitae), G2P, Ambry Genetics
genetic developmental and epileptic encephalopathy
Inheritance: AD Classification: DEFINITIVE, SUPPORTIVE Submitted by: Orphanet, ClinGen
movement disorder
Inheritance: AD Classification: DEFINITIVE Submitted by: ClinGen, Illumina
neurodevelopmental disorder with involuntary movements
Inheritance: AD Classification: STRONG Submitted by: Labcorp Genetics (formerly Invitae)

GNAO1 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Likely_pathogenic. The variant received 7 ACMG points.

PM1

In a hotspot region, there are 17 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 4 uncertain in NM_020988.3

PM2

Very rare variant in population databases, with high coverage;

PP3

MetaRNN computational evidence supports a deleterious effect, 0.921

PP5

Variant 16-56336741-G-A is Pathogenic according to our data. Variant chr16-56336741-G-A is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 545591.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein
GNAO1	NM_020988.3 link	c.604G>A	p.Val202Ile	missense_variant	Exon 6 of 9	ENST00000262493.12	NP_066268.1
GNAO1	NM_138736.3 link	c.604G>A	p.Val202Ile	missense_variant	Exon 6 of 8		NP_620073.2
GNAO1	XM_011523003.4 link	c.478G>A	p.Val160Ile	missense_variant	Exon 6 of 9		XP_011521305.1
GNAO1	XR_007064866.1 link	n.1351G>A		non_coding_transcript_exon_variant	Exon 6 of 9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
GNAO1	ENST00000262493.12 link	c.604G>A	p.Val202Ile	missense_variant	Exon 6 of 9	1	NM_020988.3	ENSP00000262493.6

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

6.85e-7

AC:

AN:

1459214

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

725786

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33450

American (AMR)

AF:

0.00

AC:

AN:

44494

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26116

East Asian (EAS)

AF:

0.00

AC:

AN:

39612

South Asian (SAS)

AF:

0.00

AC:

AN:

85938

European-Finnish (FIN)

AF:

0.00

AC:

AN:

52314

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5764

European-Non Finnish (NFE)

AF:

9.00e-7

AC:

AN:

1111238

Other (OTH)

AF:

0.00

AC:

AN:

60288

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.425

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

Cov.:

Alfa

AF:

0.00

Hom.:

Bravo

AF:

0.00000378

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Pathogenic:1Uncertain:2

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

GNAO1-related disorder

Pathogenic:1

May 11, 2020

Rady Children's Institute for Genomic Medicine, Rady Children's Hospital San Diego

Significance:Likely pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This variant has not been previously reported or functionally characterized in the literature to our knowledge. It is absent from the gnomAD population database and thus is presumed to be rare. The c.604G>A (p.Val202Ile) variant affects a highly conserved amino acid and is predicted by multiple in silico tools to have a deleterious effect on protein function. A recurrent missense variant at the adjacent amino acid residue (c.607G>A, p.G203R) has been reported as a de novo change in individuals with phenotypes that include epileptic encephalopathy, developmental delay, chorea, dystrophy, dystonia (PMID: 28628939, 28973083, 29100083, 28688840, 28202424, 25966631, 23993195). Analysis of the parental samples was negative for the variant, indicating this variant likely occurred as a de novo event. Based on the available evidence, the c.604G>A (p.Val202Ile) variant is classified as Likely Pathogenic. -

not provided

Uncertain:1

Jun 12, 2019

GeneDx

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Not observed in large population cohorts (Lek et al., 2016); In silico analysis, which includes protein predictors and evolutionary conservation, supports that this variant does not alter protein structure/function; Has not been previously published as pathogenic or benign to our knowledge -

Neurodevelopmental disorder with involuntary movements

Uncertain:1

Apr 16, 2018

HudsonAlpha Institute for Biotechnology, HudsonAlpha Institute for Biotechnology

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:research

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.84

BayesDel_addAF

Pathogenic

0.22

BayesDel_noAF

Uncertain

0.070

CADD

Pathogenic

(source)

DANN

Uncertain

1.0

DEOGEN2

Uncertain

0.57

D;D;.;.

Eigen

Pathogenic

0.98

Eigen_PC

Pathogenic

0.92

FATHMM_MKL

Uncertain

0.95

LIST_S2

Pathogenic

0.97

.;D;D;D

M_CAP

Pathogenic

0.37

MetaRNN

Pathogenic

0.92

D;D;D;D

MetaSVM

Pathogenic

1.0

MutationAssessor

Pathogenic

3.9

H;H;H;.

PhyloP100

PrimateAI

Pathogenic

0.84

PROVEAN

Benign

-0.95

N;.;N;.

REVEL

Pathogenic

0.73

Sift

Pathogenic

0.0

D;.;D;.

Sift4G

Uncertain

0.015

D;.;D;.

Polyphen

0.99

D;D;D;.

Vest4

0.52

MutPred

0.86

Gain of catalytic residue at V202 (P = 0.0681);Gain of catalytic residue at V202 (P = 0.0681);Gain of catalytic residue at V202 (P = 0.0681);.;

MVP

0.89

MPC

2.4

ClinPred

1.0

GERP RS

5.3

PromoterAI

-0.10

Neutral

(source)

Varity_R

0.81

gMVP

0.86

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

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over