rs766590491

Positions:

• chr1-215867112-G-A

Variant summary

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

The NM_206933.4(USH2A):​c.8740C>T​(p.Arg2914*) variant causes a stop gained change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000103 in 1,461,842 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 Likely pathogenic (★★). Variant results in nonsense mediated mRNA decay.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.000010 (0 hom.)
• Consequence: USH2A NM_206933.4 stop_gained
• Clinical Significance: Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:13
• Conservation: PhyloP100: 1.26

Genes affected

USH2A (HGNC:12601): (usherin) This gene encodes a protein that contains laminin EGF motifs, a pentaxin domain, and many fibronectin type III motifs. The protein is found in the basement membrane, and may be important in development and homeostasis of the inner ear and retina. Mutations within this gene have been associated with Usher syndrome type IIa and retinitis pigmentosa. Multiple transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Dec 2008]

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 1-215867112-G-A is Pathogenic according to our data. Variant chr1-215867112-G-A is described in ClinVar as [Likely_pathogenic]. Clinvar id is 228417.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr1-215867112-G-A is described in Lovd as [Pathogenic]. Variant chr1-215867112-G-A is described in Lovd as [Likely_pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
USH2A	NM_206933.4	c.8740C>T	p.Arg2914*	stop_gained	44/72	ENST00000307340.8	NP_996816.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
USH2A	ENST00000307340.8	c.8740C>T	p.Arg2914*	stop_gained	44/72	1	NM_206933.4	ENSP00000305941.3
USH2A	ENST00000674083.1	c.8740C>T	p.Arg2914*	stop_gained	44/73			ENSP00000501296.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD3 exomes AF: 0.0000239 AC: 6 AN: 251234 Hom.: 0 AF XY: 0.0000221 AC XY: 3 AN XY: 135772

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.0000289

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.0000327

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000352

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.0000103 AC: 15 AN: 1461842 Hom.: 0 Cov.: 31 AF XY: 0.00000688 AC XY: 5 AN XY: 727234

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.0000224

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.0000116

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.0000108

Gnomad4 OTH exome AF: 0.0000166

GnomAD4 genome Cov.: 33

Alfa AF: 0.0000963 Hom.: 0

ExAC AF: 0.00000824 AC: 1

EpiCase AF: 0.0000545

EpiControl AF: 0.00

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:13

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Retinitis pigmentosa 39 Pathogenic:4

Pathogenic, no assertion criteria provided	clinical testing	Counsyl	Apr 14, 2017	- -
Likely pathogenic, criteria provided, single submitter	clinical testing	Genome-Nilou Lab	Nov 04, 2023	- -
Pathogenic, criteria provided, single submitter	clinical testing	Baylor Genetics	Mar 18, 2024	- -
Likely pathogenic, criteria provided, single submitter	research	Ocular Genomics Institute, Massachusetts Eye and Ear	Apr 08, 2021	The USH2A c.8740C>T variant was identified in an individual with retinitis pigmentosa with a presumed recessive inheritance pattern. Through a review of available evidence we were able to apply the following criteria: PVS1, PM2. Based on this evidence we have classified this variant as Likely Pathogenic. -

not provided Pathogenic:3

Pathogenic, criteria provided, single submitter	clinical testing	CeGaT Center for Human Genetics Tuebingen	Nov 01, 2017	- -
Pathogenic, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Nov 25, 2023	This sequence change creates a premature translational stop signal (p.Arg2914*) in the USH2A gene. It is expected to result in an absent or disrupted protein product. Loss-of-function variants in USH2A are known to be pathogenic (PMID: 10729113, 10909849, 20507924, 25649381). This variant is present in population databases (rs766590491, gnomAD 0.003%). This premature translational stop signal has been observed in individuals with USH2A-related conditions (PMID: 24944099, 25472526). ClinVar contains an entry for this variant (Variation ID: 228417). For these reasons, this variant has been classified as Pathogenic. -
Pathogenic, criteria provided, single submitter	clinical testing	Institute of Medical Genetics and Applied Genomics, University Hospital Tübingen	Oct 23, 2020	- -

Usher syndrome type 2A Pathogenic:2

Likely pathogenic, criteria provided, single submitter	clinical testing	Genome-Nilou Lab	Nov 04, 2023	- -
Pathogenic, no assertion criteria provided	clinical testing	Natera, Inc.	Sep 16, 2020	- -

Retinal dystrophy Pathogenic:2

Pathogenic, criteria provided, single submitter	clinical testing	Blueprint Genetics	Jul 21, 2018	- -
Pathogenic, criteria provided, single submitter	clinical testing	Institute of Human Genetics, Univ. Regensburg, Univ. Regensburg	Jan 01, 2011	- -

Usher syndrome type 2A;C3151138:Retinitis pigmentosa 39 Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Fulgent Genetics, Fulgent Genetics

May 06, 2024

- -

Rare genetic deafness Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

Apr 24, 2015

The p.Arg2914X variant in USH2A has been previously reported in 4 individuals wi th Usher syndrome (Baux 2014, McGee 2010) and 1 individual with retinitis pigmen tosa (RP) (Zhao 2015), however hearing loss was not evaluated in the latter. At least 4 of these individuals were compound heterozygous for a second pathogenic variant in USH2A. This variant has been identified in 1/66678 European chromoso mes by the Exome Aggregation Consortium (ExAC, http://exac.broadinstitute.org), though this frequency is low enough to be consistent with a recessive carrier fr equency. This nonsense variant leads to a premature termination codon at positio n 2914, which is predicted to lead to a truncated or absent protein. Loss of fun ction of the USH2A gene is an established disease mechanism in Usher syndrome. I n summary, the p.Arg2914X variant in USH2A meets our criteria to be classified a s pathogenic for autosomal recessive Usher syndrome based upon the predicted imp act to the protein and the previously reported individuals with Usher syndrome ( www.partners.org/personalizedmedicine/lmm). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.56	D
BayesDel_noAF	Pathogenic	0.28
CADD	Pathogenic	36
DANN	Uncertain	0.99
Eigen	Benign	0.099
Eigen_PC	Benign	-0.19
FATHMM_MKL	Benign	0.50	D
Vest4		0.90
GERP RS		2.5

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: rs766590491; hg19: chr1-216040454; COSMIC: COSV56424805;