rs777309662

Positions:

• chr5-90778558-T-A

Variant summary

Our verdict is Pathogenic. Variant got 18 ACMG points: 18P and 0B. PVS1 PM2 PP5_Very_Strong

The NM_032119.4(ADGRV1):​c.12798T>A​(p.Tyr4266*) variant causes a stop gained change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000096 in 1,459,092 control chromosomes in the GnomAD database, including 1 homozygotes. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Pathogenic (★★). Variant results in nonsense mediated mRNA decay.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000096 (1 hom.)
• Consequence: ADGRV1 NM_032119.4 stop_gained
• Clinical Significance: Pathogenic criteria provided, multiple submitters, no conflicts P:4
• Conservation: PhyloP100: 0.157

Genes affected

ADGRV1 (HGNC:17416): (adhesion G protein-coupled receptor V1) This gene encodes a member of the G-protein coupled receptor superfamily. The encoded protein contains a 7-transmembrane receptor domain, binds calcium and is expressed in the central nervous system. Mutations in this gene are associated with Usher syndrome 2 and familial febrile seizures. Several alternatively spliced transcripts have been described. [provided by RefSeq, Jul 2008]

ADGRV1 (HGNC:):

ACMG classification

Verdict is Pathogenic. Variant got 18 ACMG points.

• PVS1: Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 5-90778558-T-A is Pathogenic according to our data. Variant chr5-90778558-T-A is described in ClinVar as [Pathogenic]. Clinvar id is 438168.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr5-90778558-T-A is described in Lovd as [Likely_pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
ADGRV1	NM_032119.4	c.12798T>A	p.Tyr4266*	stop_gained	63/90	ENST00000405460.9	NP_115495.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
ADGRV1	ENST00000405460.9	c.12798T>A	p.Tyr4266*	stop_gained	63/90	1	NM_032119.4	ENSP00000384582.2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD3 exomes AF: 0.0000243 AC: 6 AN: 247180 Hom.: 0 AF XY: 0.0000373 AC XY: 5 AN XY: 134094

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.000198

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000960 AC: 14 AN: 1459092 Hom.: 1 Cov.: 31 AF XY: 0.0000138 AC XY: 10 AN XY: 725590

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.000163

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

ExAC AF: 0.0000248 AC: 3

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:4

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Usher syndrome Pathogenic:2

Likely pathogenic, no assertion criteria provided	research	NIHR Bioresource Rare Diseases, University of Cambridge	Jan 01, 2015	- -
Pathogenic, criteria provided, single submitter	clinical testing	Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine	Oct 10, 2019	The p.Tyr4266X variant in ADGRV1 (also known as GPR98) has been previously reported in two individuals with hearing loss by our laboratory. Both individuals were tested before the age of 5 years and were not reported to have any vision concerns. This variant has also been identified in 0.02% (6/30350) South Asian chromosomes by gnomAD (http://gnomad.broadinstitute.org). Although this variant has been seen in the general population, its frequency is low enough to be consistent with a recessive carrier frequency. This nonsense variant leads to a premature termination codon at position 4266, which is predicted to lead to a truncated or absent protein. Loss of function of the ADGRV1 gene is an established disease mechanism in autosomal recessive Usher syndrome. In summary, this variant meets criteria to be classified as pathogenic for autosomal recessive Usher syndrome. ACMG/AMP Criteria applied: PVS1, PM3_Supporting, PP1, PM2_Supporting. -

not provided Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Sep 03, 2023

This sequence change creates a premature translational stop signal (p.Tyr4266*) in the ADGRV1 gene. It is expected to result in an absent or disrupted protein product. Loss-of-function variants in ADGRV1 are known to be pathogenic (PMID: 19357117, 22135276, 22147658, 26226137, 30718709, 31047384, 32467589). This variant is present in population databases (rs777309662, gnomAD 0.02%). This premature translational stop signal has been observed in individual(s) with autosomal recessive ADGRV1-related conditions (PMID: 28041643, 32581362). ClinVar contains an entry for this variant (Variation ID: 438168). For these reasons, this variant has been classified as Pathogenic. -

Retinal dystrophy Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Blueprint Genetics

Sep 21, 2018

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.39	D
BayesDel_noAF	Pathogenic	0.60
CADD	Pathogenic	35
DANN	Uncertain	0.99
Eigen	Uncertain	0.41
Eigen_PC	Benign	0.21
FATHMM_MKL	Pathogenic	0.97	D
Vest4		0.073
GERP RS		0.58
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7

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

LitVar

Other links and lift over

dbSNP: rs777309662; hg19: chr5-90074375;