1-216251047-G-A

Position:

• chr1-216251047-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.2023C>T​(p.Gln675*) variant causes a stop gained change. The variant allele was found at a frequency of 0.0000041 in 1,461,764 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 Pathogenic (★★). Variant results in nonsense mediated mRNA decay.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000041 (0 hom.)
• Consequence: USH2A NM_206933.4 stop_gained
• Clinical Significance: Pathogenic criteria provided, multiple submitters, no conflicts P:7
• Conservation: PhyloP100: 3.98

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 1-216251047-G-A is Pathogenic according to our data. Variant chr1-216251047-G-A is described in ClinVar as [Pathogenic]. Clinvar id is 553607.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr1-216251047-G-A is described in Lovd as [Pathogenic]. Variant chr1-216251047-G-A is described in Lovd as [Pathogenic]. Variant chr1-216251047-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.2023C>T	p.Gln675*	stop_gained	12/72	ENST00000307340.8	NP_996816.3
USH2A	NM_007123.6	c.2023C>T	p.Gln675*	stop_gained	12/21		NP_009054.6

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
USH2A	ENST00000307340.8	c.2023C>T	p.Gln675*	stop_gained	12/72	1	NM_206933.4	ENSP00000305941.3
USH2A	ENST00000366942.3	c.2023C>T	p.Gln675*	stop_gained	12/21	1		ENSP00000355909.3
USH2A	ENST00000674083.1	c.2023C>T	p.Gln675*	stop_gained	12/73			ENSP00000501296.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000410 AC: 6 AN: 1461764 Hom.: 0 Cov.: 32 AF XY: 0.00000275 AC XY: 2 AN XY: 727184

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: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000540

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:7

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Retinitis pigmentosa 39 Pathogenic:3

Pathogenic, criteria provided, single submitter	clinical testing	Baylor Genetics	Aug 30, 2023	- -
Pathogenic, criteria provided, single submitter	clinical testing	Genome-Nilou Lab	Nov 04, 2023	- -
Pathogenic, criteria provided, single submitter	clinical testing	Institute of Human Genetics, University of Leipzig Medical Center	Sep 21, 2021	This variant was identified as compound heterozygous with NM_206933.4:c.2797C>T. -

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

Pathogenic, criteria provided, single submitter

clinical testing

Counsyl

Aug 30, 2017

- -

not provided Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

May 03, 2022

This sequence change creates a premature translational stop signal (p.Gln675*) 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 not present in population databases (gnomAD no frequency). This premature translational stop signal has been observed in individual(s) with USH2A-related conditions (PMID: 10909849, 29625443). ClinVar contains an entry for this variant (Variation ID: 553607). For these reasons, this variant has been classified as Pathogenic. -

Usher syndrome type 2A Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Genome-Nilou Lab

Nov 04, 2023

- -

Retinal dystrophy Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Institute of Human Genetics, Univ. Regensburg, Univ. Regensburg

Jan 01, 2020

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.63	D
BayesDel_noAF	Pathogenic	0.62
CADD	Pathogenic	36
DANN	Uncertain	1.0
Eigen	Pathogenic	0.81
Eigen_PC	Uncertain	0.66
FATHMM_MKL	Uncertain	0.90	D
Vest4		0.81
GERP RS		4.3

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: rs868562952; hg19: chr1-216424389;