rs754634823

Positions:

chr1-216198369-T-G

Variant summary

Our verdict is Uncertain significance. Variant got 5 ACMG points: 5P and 0B. PM2PM5PP3

The NM_206933.4(USH2A):c.4027A>C(p.Asn1343His) variant causes a missense change. The variant allele was found at a frequency of 0.0000415 in 1,613,950 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 Uncertain significance (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. N1343K) has been classified as Pathogenic.

Frequency

Genomes: 𝑓 0.000026 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000043 ( 1 hom. )

Consequence

USH2A
NM_206933.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts P:1U:9

Conservation

PhyloP100: 3.89

Variant links:

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]

USH2A links:

USH2A-AS1 (HGNC:40606): (USH2A antisense RNA 1)

USH2A-AS1 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 5 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

PM5

Other missense variant is known to change same aminoacid residue: Variant chr1-216198367-A-C is described in Lovd as [Pathogenic].

PP3

MetaRNN computational evidence supports a deleterious effect, 0.837

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
USH2A	NM_206933.4 linkuse as main transcript	c.4027A>C	p.Asn1343His	missense_variant	18/72	ENST00000307340.8	NP_996816.3
USH2A-AS1	XR_922596.4 linkuse as main transcript	n.691+2444T>G		intron_variant, non_coding_transcript_variant

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
USH2A	ENST00000307340.8 linkuse as main transcript	c.4027A>C	p.Asn1343His	missense_variant	18/72	1	NM_206933.4	ENSP00000305941	P1	O75445-1
USH2A	ENST00000366942.3 linkuse as main transcript	c.4027A>C	p.Asn1343His	missense_variant	18/21	1		ENSP00000355909		O75445-2
USH2A-AS1	ENST00000420867.1 linkuse as main transcript	n.362+2444T>G		intron_variant, non_coding_transcript_variant		3
USH2A	ENST00000674083.1 linkuse as main transcript	c.4027A>C	p.Asn1343His	missense_variant	18/73			ENSP00000501296		O75445-3

Frequencies

GnomAD3 genomes

AF:

0.0000263

AC:

AN:

152192

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.000828

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.000104

AC:

AN:

251046

Hom.:

AF XY:

0.000155

AC XY:

AN XY:

135664

show subpopulations

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:

0.000719

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000265

Gnomad OTH exome

AF:

0.000163

GnomAD4 exome

AF:

0.0000431

AC:

AN:

1461758

Hom.:

Cov.:

AF XY:

0.0000619

AC XY:

AN XY:

727182

show subpopulations

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:

0.000533

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000117

Gnomad4 OTH exome

AF:

0.0000497

GnomAD4 genome

AF:

0.0000263

AC:

AN:

152192

Hom.:

Cov.:

AF XY:

0.0000404

AC XY:

AN XY:

74346

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.000828

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.00

Bravo

AF:

0.00000756

ExAC

AF:

0.000132

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Pathogenic:1Uncertain:9

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Usher syndrome type 2A

Uncertain:3

Uncertain significance, criteria provided, single submitter	research	Broad Center for Mendelian Genomics, Broad Institute of MIT and Harvard	Dec 03, 2018	The homozygous p.Asn1343His variant in USH2A was identified by our study in one individual with Usher syndrome. The p.Asn1343His variant in USH2A has been reported in 2 individuals (1 South Asian, 1 unknown) with retinitis pigmentosa, a clinical feature of Usher syndrome (PMID: 28041643, 23591405), and has been identified in 0.07473% (23/30778) of South Asian chromosomes, including 1 homozygote, by the Genome Aggregation Database (gnomAD, http://gnomad.broadinstitute.org; dbSNP rs754634823). Although this variant has been seen in the general population, its frequency is low enough to be consistent with a recessive carrier frequency. Please note that for diseases with clinical variability, or reduced penetrance, pathogenic variants may be present, in a homozygous state, at a low frequency in the general population. Computational prediction tools and conservation analyses do not provide strong support for or against an impact to the protein. This variant has also been reported as a VUS and a likely pathogenic variant in ClinVar (Variation ID: 438020). This variant was seen in combination with another USH2A variant, which has not been reported in ClinVar, in one individual with retinitis pigmentosaa (PMID: 23591405). In summary, while there is some suspicion for a pathogenic role, the clinical significance of this variant is uncertain. ACMG/AMP Criteria applied: PM2 (Richards 2015). -
Uncertain significance, no assertion criteria provided	clinical testing	Natera, Inc.	Feb 15, 2020	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Genome-Nilou Lab	Jul 22, 2021	- -

Usher syndrome type 2A;C3151138:Retinitis pigmentosa 39

Uncertain:2

Uncertain significance, criteria provided, single submitter	clinical testing	Fulgent Genetics, Fulgent Genetics	Feb 24, 2022	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Counsyl	Oct 09, 2017	- -

Retinitis pigmentosa

Pathogenic:1

Likely pathogenic, no assertion criteria provided

research

NIHR Bioresource Rare Diseases, University of Cambridge

Jan 01, 2015

- -

not specified

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Mar 16, 2022

Variant summary: USH2A c.4027A>C (p.Asn1343His) results in a conservative amino acid change in the encoded protein sequence. Four of five in-silico tools predict a damaging effect of the variant on protein function. The variant allele was found at a frequency of 0.0001 in 251046 control chromosomes in the gnomAD database, including 1 homozygote. This frequency is not significantly higher than estimated for a pathogenic variant in USH2A causing Usher Syndrome (0.0001 vs 0.011), allowing no conclusion about variant significance. c.4027A>C has been reported in the literature in heterozygosity along with another phase unspecified USH2A variant (c.7358T>A, p.Val2453Asp) in one individual with Retinitis Pigmentosa who underwent whole genome sequencing (WGS) (example, Carss_2017, subsequently cited by Molina-Ramirez_2020). It was also reported in heterozygosity along with another heterozygous phase unspecified USH2A variant (c.2108A>T, p.D703V) in an individual with sporadic Retinitis Pigmentosa who harbored a homozygous variant in the TULP1 gene (c.629C>G, p.S210X) that was stated as likely causative of disease (example, Glockle_2014). These report(s) do not provide unequivocal conclusions about association of the variant with Usher Syndrome. To our knowledge, no experimental evidence demonstrating an impact on protein function has been reported. Six clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar after 2014 without evidence for independent evaluation (Likely pathogenic, n=1; VUS, n=5). Based on the evidence outlined above, the variant was classified as uncertain significance. -

not provided

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jan 24, 2024

This sequence change replaces asparagine, which is neutral and polar, with histidine, which is basic and polar, at codon 1343 of the USH2A protein (p.Asn1343His). This variant is present in population databases (rs754634823, gnomAD 0.07%), including at least one homozygous and/or hemizygous individual. This missense change has been observed in individuals with clinical features of autosomal recessive retinitis pigmentosa (PMID: 28041643; Invitae). ClinVar contains an entry for this variant (Variation ID: 438020). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) has been performed at Invitae for this missense variant, however the output from this modeling did not meet the statistical confidence thresholds required to predict the impact of this variant on USH2A protein function. This variant disrupts the p.Asn1343 amino acid residue in USH2A. Other variant(s) that disrupt this residue have been determined to be pathogenic (PMID: 33926394). This suggests that this residue is clinically significant, and that variants that disrupt this residue are likely to be disease-causing. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -

Retinitis pigmentosa 39

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Genome-Nilou Lab

Jul 22, 2021

- -

Retinal dystrophy

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Blueprint Genetics

Aug 02, 2019

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.56

BayesDel_addAF

Benign

-0.19

BayesDel_noAF

Benign

-0.14

CADD

Benign

DANN

Uncertain

1.0

DEOGEN2

Benign

0.35

T;.

Eigen

Pathogenic

0.70

Eigen_PC

Uncertain

0.59

FATHMM_MKL

Uncertain

0.92

LIST_S2

Benign

0.83

T;T

M_CAP

Uncertain

0.15

MetaRNN

Pathogenic

0.84

D;D

MetaSVM

Uncertain

0.17

MutationAssessor

Pathogenic

3.8

H;H

MutationTaster

Benign

1.0

D;D;D

PrimateAI

Uncertain

0.53

PROVEAN

Uncertain

-3.4

D;D

REVEL

Uncertain

0.56

Sift

Pathogenic

0.0

D;D

Sift4G

Pathogenic

0.0

D;D

Polyphen

1.0

D;D

Vest4

0.75

MutPred

0.81

Loss of methylation at R1338 (P = 0.1191);Loss of methylation at R1338 (P = 0.1191);

MVP

0.91

MPC

0.24

ClinPred

0.94

GERP RS

4.4

Varity_R

0.93

gMVP

0.67

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over