1-216072887-A-G

Position:

chr1-216072887-A-G

Variant summary

Our verdict is Likely pathogenic. Variant got 6 ACMG points: 6P and 0B. PP4PM2_SupportingPVS1_ModeratePM3

This summary comes from the ClinGen Evidence Repository: The c.5857+2T>C variant in USH2A has been identified in at least 3 probands with Usher syndrome, including two who were compound heterozygous for a second pathogenic variant though phase was not confirmed (PM3, PP4; PMID 20507924, 20507924, 18641288, LMM unpublished data SCV000065566.6). The allele frequency of this variant is 0.01% (2/15422) of European chromosomes by gnomAD, which is a low enough frequency to apply PM2_Supporting based on the thresholds defined by the ClinGen Hearing Loss Expert Panel for autosomal recessive hearing loss (PM2_Supporting). This variant occurs within the canonical splice site (+/- 1,2) and is predicted to cause altered splicing, though the exact impact is unknown. Exon 29 is in-frame, and if the variant results in exon skipping, it would remove <10% of the USH2A protein. However, two truncating pathogenic / likely pathogenic variants in this exon have been reported in ClinVar, which may suggest it is required for normal protein function (PVS1_Moderate). In summary, this variant meets criteria to be classified as likely pathogenic for autosomal recessive Usher syndrome based on the ACMG/AMP criteria applied as specified by the Hearing Loss Expert Panel (PVS1_Moderate, PM3, PP4, PM2_Supporting). LINK:https://erepo.genome.network/evrepo/ui/classification/CA262109/MONDO:0019501/005

Frequency

Genomes: 𝑓 0.000020 ( 0 hom., cov: 32)

Exomes 𝑓: 0.0000062 ( 0 hom. )

Consequence

USH2A
NM_206933.4 splice_donor

Scores

Splicing: ADA: 0.9884

Clinical Significance

Likely pathogenic reviewed by expert panel P:8U:1

Conservation

PhyloP100: 6.78

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-AS2 (HGNC:40605): (USH2A antisense RNA 2)

USH2A-AS2 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_pathogenic. Variant got 6 ACMG points.

PVS1

PM2

PM3

PP4

Transcripts

RefSeq

Gene	Transcript	HGVSc	Effect	MANE
USH2A	NM_206933.4 linkuse as main transcript	c.5857+2T>C	splice_donor_variant	ENST00000307340.8
USH2A-AS2	NR_125992.1 linkuse as main transcript	n.136+287A>G	intron_variant, non_coding_transcript_variant
USH2A-AS2	NR_125993.1 linkuse as main transcript	n.136+287A>G	intron_variant, non_coding_transcript_variant

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
USH2A	ENST00000307340.8 linkuse as main transcript	c.5857+2T>C		splice_donor_variant		1	NM_206933.4	P1	O75445-1
USH2A-AS2	ENST00000446411.5 linkuse as main transcript	n.136+287A>G		intron_variant, non_coding_transcript_variant		2

Frequencies

GnomAD3 genomes

AF:

0.0000197

AC:

AN:

152148

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000241

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000294

Gnomad OTH

AF:

0.00

GnomAD4 exome

AF:

0.00000616

AC:

AN:

1461262

Hom.:

Cov.:

AF XY:

0.00000688

AC XY:

AN XY:

726988

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:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00000810

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

AF:

0.0000197

AC:

AN:

152148

Hom.:

Cov.:

AF XY:

0.0000135

AC XY:

AN XY:

74304

show subpopulations

Gnomad4 AFR

AF:

0.0000241

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000294

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000688

Hom.:

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:8Uncertain:1

Revision: reviewed by expert panel

LINK: link

Submissions by phenotype

not provided

Pathogenic:2

Pathogenic, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Jan 19, 2024	This sequence change affects a donor splice site in intron 29 of the USH2A gene. It is expected to disrupt RNA splicing. Variants that disrupt the donor or acceptor splice site typically lead to a loss of protein function (PMID: 16199547), and loss-of-function variants in USH2A are known to be pathogenic (PMID: 10729113, 10909849, 20507924, 25649381). This variant is present in population databases (rs397518022, gnomAD 0.01%). Disruption of this splice site has been observed in individuals with autosomal recessive inherited retinal dystrophy and Usher syndrome, type 2A (PMID: 18641288, 20507924; Invitae). ClinVar contains an entry for this variant (Variation ID: 48544). Algorithms developed to predict the effect of sequence changes on RNA splicing suggest that this variant may disrupt the consensus splice site. For these reasons, this variant has been classified as Pathogenic. -
Likely pathogenic, criteria provided, single submitter	clinical testing	GeneDx	Jan 12, 2023	Identified in individuals with Usher syndrome type II in the published literature, however, it is unknown if a second USH2A variant was identified in some cases (Sandberg et al., 2008; McGee et al., 2010); Canonical splice site variant expected to result in aberrant splicing, although in the absence of functional evidence the actual effect of this sequence change is unknown.; This variant is associated with the following publications: (PMID: 25525159, 20507924, 18641288, 35266249, 26582918) -

Retinitis pigmentosa 39

Pathogenic:2

Pathogenic, criteria provided, single submitter	clinical testing	Baylor Genetics	Mar 24, 2024	- -
Likely pathogenic, no assertion criteria provided	clinical testing	Counsyl	May 09, 2017	- -

Usher syndrome

Pathogenic:1

Likely pathogenic, reviewed by expert panel

curation

ClinGen Hearing Loss Variant Curation Expert Panel

Oct 29, 2019

The c.5857+2T>C variant in USH2A has been identified in at least 3 probands with Usher syndrome, including two who were compound heterozygous for a second pathogenic variant though phase was not confirmed (PM3, PP4; PMID 20507924, 20507924, 18641288, LMM unpublished data SCV000065566.6). The allele frequency of this variant is 0.01% (2/15422) of European chromosomes by gnomAD, which is a low enough frequency to apply PM2_Supporting based on the thresholds defined by the ClinGen Hearing Loss Expert Panel for autosomal recessive hearing loss (PM2_Supporting). This variant occurs within the canonical splice site (+/- 1,2) and is predicted to cause altered splicing, though the exact impact is unknown. Exon 29 is in-frame, and if the variant results in exon skipping, it would remove <10% of the USH2A protein. However, two truncating pathogenic / likely pathogenic variants in this exon have been reported in ClinVar, which may suggest it is required for normal protein function (PVS1_Moderate). In summary, this variant meets criteria to be classified as likely pathogenic for autosomal recessive Usher syndrome based on the ACMG/AMP criteria applied as specified by the Hearing Loss Expert Panel (PVS1_Moderate, PM3, PP4, PM2_Supporting). -

Rare genetic deafness

Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

Mar 11, 2013

The 5857+2T>C variant has been reported in 2 probands with the clinical features of Usher syndrome type II, one of whom carried a second pathogenic USH2A varian t (Sandberg 2008, McGee 2010). This variant occurs in the invariant region (+1/2 ) of the 5' splice consensus sequence and is predicted to cause altered splicing leading to an abnormal or absent protein. In summary, this variant meets our cr iteria to be classified as pathogenic (http://pcpgm.partners.org/LMM). -

Retinal dystrophy

Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Blueprint Genetics

Jan 16, 2019

- -

Usher syndrome type 2A

Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Greenwood Genetic Center Diagnostic Laboratories, Greenwood Genetic Center

Jul 25, 2022

PVS1_Moderate, PM2, PM3, PP4 -

USH2A-related disorder

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jun 14, 2016

The c.5857+2T>C variant variant occurs in a canonical splice site (donor) and is therefore predicted to disrupt or distort the normal gene product. The variant has been described in two studies in which it was found in a compound heterozygous state in one individual with autosomal recessive retinitis pigmentosa, and in a heterozygous state in two individuals with Usher syndrome type II (Sandberg et al. 2008; McGee et al. 2010). Control data are unavailable for this variant which is also not found in the 1000 Genomes Project, the Exome Sequencing Project, or the Exome Aggregation Consortium. Due to the potential impact of splice donor variants and the supporting evidence from the literature, this variant is classified as a variant of unknown significance, but suspicious for pathogenicity for USH2A-related disorders. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_addAF

Pathogenic

0.63

BayesDel_noAF

Pathogenic

0.22

CADD

Uncertain

DANN

Uncertain

0.99

Eigen

Pathogenic

0.98

Eigen_PC

Pathogenic

0.82

FATHMM_MKL

Pathogenic

0.99

MutationTaster

Benign

1.0

D;D

GERP RS

4.9

Splicing

Name

Calibrated prediction

Score

Prediction

dbscSNV1_ADA

Pathogenic

0.99

dbscSNV1_RF

Benign

0.58

SpliceAI score (max)

0.88

Details are displayed if max score is > 0.2

DS_DL_spliceai

0.88

Position offset: 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