9-77797576-TC-CT

Variant names:

• chr9-77797576-TC-CT
• NM_002072.5:c.548_549delGAinsAG
• GNAQ p.Arg183Gln

Variant summary

Our verdict is Pathogenic. The variant received 12 ACMG points: 12P and 0B. PS1_Very_Strong PM5 PP2 PP3

The NM_002072.5(GNAQ):​c.548_549delGAinsAG​(p.Arg183Gln) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. It is difficult to determine the true allele frequency of this variant because it is of type MNV, and the frequency of such variant types in population databases may be underestimated and unreliable. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another nucleotide change resulting in the same amino acid substitution has been previously reported as Likely pathogenic in ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R183G) has been classified as Pathogenic.

• Frequency: Genomes: not found (cov: 32)
• Consequence: GNAQ NM_002072.5 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 7.86
• Publications: 0 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: Ambry Genetics, Labcorp Genetics (formerly Invitae), G2P

ACMG classification

Our verdict: Pathogenic. The variant received 12 ACMG points.

• PS1: Transcript NM_002072.5 (GNAQ) is affected with MISSENSE_VARIANT having same AA change as one Pathogenic present in ClinVar.
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr9-77797578-G-C is described in ClinVar as Pathogenic. ClinVar VariationId is 2664271.Status of the report is criteria_provided_single_submitter, 1 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: No computational evidence supports a deleterious effect, but strongly conserved according to phyloP

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_002072.5. 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
	GNAQ	NM_002072.5	MANE Select	c.548_549delGAinsAG	p.Arg183Gln	missense	N/A	NP_002063.2

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	GNAQ	ENST00000286548.9	TSL:1 MANE Select	c.548_549delGAinsAG	p.Arg183Gln	missense	N/A	ENSP00000286548.4	P50148
	GNAQ	ENST00000857199.1		c.623_624delGAinsAG	p.Arg208Gln	missense	N/A	ENSP00000527258.1
	GNAQ	ENST00000915940.1		c.548_549delGAinsAG	p.Arg183Gln	missense	N/A	ENSP00000585999.1

Frequencies

GnomAD3 genomes Cov.: 32

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
PhyloP100		7.9

Splicing

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

hg19: chr9-80412492;