chr9-77794572-T-G

Variant names:

• chr9-77794572-T-G
• rs121913492
• NM_002072.5:c.626A>C

Variant summary

Our verdict is Likely pathogenic. The variant received 9 ACMG points: 9P and 0B. PM2 PM5 PP2 PP3_Strong

The NM_002072.5(GNAQ):​c.626A>C​(p.Gln209Pro) 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. 13/22 in silico tools predict a damaging outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. Q209H) has been classified as Pathogenic.

• Frequency: Genomes: not found (cov: 32)
• Consequence: GNAQ NM_002072.5 missense
• Clinical Significance: Pathogenic/Likely pathogenic no assertion criteria provided P:2
• Conservation: PhyloP100: 8.02
• Publications: 476 publications found

Genes affected

GNAQ (HGNC:4390): (G protein subunit alpha q) This locus encodes a guanine nucleotide-binding protein. The encoded protein, an alpha subunit in the Gq class, couples a seven-transmembrane domain receptor to activation of phospolipase C-beta. Mutations at this locus have been associated with problems in platelet activation and aggregation. A related pseudogene exists on chromosome 2.[provided by RefSeq, Nov 2010]

GNAQ Gene-Disease associations (from GenCC):

• congenital hemangioma

  Inheritance: AD Classification: STRONG Submitted by: G2P
• Sturge-Weber syndrome

  Inheritance: AD Classification: STRONG Submitted by: G2P, Ambry Genetics, Labcorp Genetics (formerly Invitae)

ACMG classification

Our verdict: Likely_pathogenic. The variant received 9 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr9-77794571-T-A is described in ClinVar as Pathogenic. ClinVar VariationId is 1172602.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
• PP2: Missense variant in the gene, where a lot of missense mutations are associated with disease in ClinVar. The gene has 10 curated pathogenic missense variants (we use a threshold of 10). The gene has 1 curated benign missense variants. Gene score misZ: 3.6575 (above the threshold of 3.09). Trascript score misZ: 2.6566 (below the threshold of 3.09). GenCC associations: The gene is linked to Sturge-Weber syndrome, congenital hemangioma.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.975

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
GNAQ	NM_002072.5	c.626A>C	p.Gln209Pro	missense_variant	Exon 5 of 7	ENST00000286548.9	NP_002063.2
GNAQ	XM_047423239.1	c.452A>C	p.Gln151Pro	missense_variant	Exon 5 of 7		XP_047279195.1
GNAQ	XM_047423240.1	c.452A>C	p.Gln151Pro	missense_variant	Exon 5 of 7		XP_047279196.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
GNAQ	ENST00000286548.9	c.626A>C	p.Gln209Pro	missense_variant	Exon 5 of 7	1	NM_002072.5	ENSP00000286548.4

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 27

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:2

Revision: no assertion criteria provided

Submissions by phenotype

Uveal melanoma Pathogenic:1

Jul 14, 2015

Database of Curated Mutations (DoCM)

Significance: Likely pathogenic

Review Status: no assertion criteria provided

Collection Method: literature only

- -

Melanoma Pathogenic:1

Oct 02, 2014

Database of Curated Mutations (DoCM)

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: literature only

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	1.0
BayesDel_addAF	Pathogenic	0.49	D
BayesDel_noAF	Pathogenic	0.47
CADD	Pathogenic	29
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.98	D
Eigen	Pathogenic	1.0
Eigen_PC	Pathogenic	0.91
FATHMM_MKL	Pathogenic	0.98	D
LIST_S2	Benign	0.76	T
M_CAP	Pathogenic	0.29	D
MetaRNN	Pathogenic	0.97	D
MetaSVM	Pathogenic	1.1	D
MutationAssessor	Pathogenic	4.3	H
PhyloP100		8.0
PrimateAI	Pathogenic	0.88	D
PROVEAN	Pathogenic	-5.8	D
REVEL	Pathogenic	0.96
Sift	Uncertain	0.0010	D
Sift4G	Pathogenic	0.0010	D
Polyphen		1.0	D
Vest4		0.90
MutPred		0.87		Loss of catalytic residue at Q209 (P = 0.0135);
MVP		0.96
MPC		2.7
ClinPred		1.0	D
GERP RS		5.7
Varity_R		0.98
gMVP		1.0
Mutation Taster		=11/89	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: rs121913492; hg19: chr9-80409488; COSMIC: COSV54105903; COSMIC: COSV54105903;