rs876657730

Variant names:

• chr1-216418680-C-G
• rs876657730
• NM_206933.4:c.486-1G>C

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.486-1G>C variant causes a splice acceptor, intron change. The variant allele was found at a frequency of 0.00000274 in 1,460,708 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. 3/3 splice prediction tools predicting alterations to normal splicing. Variant has been reported in ClinVar as Pathogenic (★★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000027 (0 hom.)
• Consequence: USH2A NM_206933.4 splice_acceptor, intron
• Scores: Splicing: ADA: 1.000
• Clinical Significance: Pathogenic criteria provided, multiple submitters, no conflicts P:7
• Conservation: PhyloP100: 5.71

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: Splicing +-2 bp (donor or acceptor) variant, LoF is a know mechanism of disease, Cryptic splice site detected, with MaxEntScore 7.9, offset of 11, new splice context is: cttcctaacgtgtgttatAGaaa. Cryptic site results in frameshift change. If cryptic site found is not functional and variant results in exon loss, it results in frameshift change.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 1-216418680-C-G is Pathogenic according to our data. Variant chr1-216418680-C-G is described in ClinVar as [Pathogenic]. Clinvar id is 228413.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr1-216418680-C-G is described in Lovd as [Pathogenic]. Variant chr1-216418680-C-G is described in Lovd as [Likely_pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
USH2A	NM_206933.4	c.486-1G>C		splice_acceptor_variant, intron_variant	Intron 2 of 71	ENST00000307340.8	NP_996816.3
USH2A	NM_007123.6	c.486-1G>C		splice_acceptor_variant, intron_variant	Intron 2 of 20		NP_009054.6

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
USH2A	ENST00000307340.8	c.486-1G>C		splice_acceptor_variant, intron_variant	Intron 2 of 71	1	NM_206933.4	ENSP00000305941.3
USH2A	ENST00000366942.3	c.486-1G>C		splice_acceptor_variant, intron_variant	Intron 2 of 20	1		ENSP00000355909.3
USH2A	ENST00000674083.1	c.486-1G>C		splice_acceptor_variant, intron_variant	Intron 2 of 72			ENSP00000501296.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD3 exomes AF: 0.00000399 AC: 1 AN: 250644 Hom.: 0 AF XY: 0.00000738 AC XY: 1 AN XY: 135436

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: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.000164

GnomAD4 exome AF: 0.00000274 AC: 4 AN: 1460708 Hom.: 0 Cov.: 33 AF XY: 0.00000413 AC XY: 3 AN XY: 726670

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: 0.00

Gnomad4 OTH exome AF: 0.0000166

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:7

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Pathogenic:2

Nov 28, 2017

GeneDx

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.486-1 G>C splice site variant in the USH2A gene has been previously reported in association with Usher syndrome (Cremers et al., 2007; Neuhaus et al., 2017). This variant destroys the canonical splice acceptor site in intron 2, and is expected to cause abnormal gene splicing. The c.486-1 G>C variant is not observed in large population cohorts (Lek et al., 2016). Based on currently available evidence, we consider c.486-1G>C to be pathogenic. -

Sep 25, 2022

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

For these reasons, this variant has been classified as Pathogenic. Algorithms developed to predict the effect of sequence changes on RNA splicing suggest that this variant may disrupt the consensus splice site. ClinVar contains an entry for this variant (Variation ID: 228413). Disruption of this splice site has been observed in individuals with USH2A-related conditions (PMID: 24154662, 32037395). This variant is present in population databases (no rsID available, gnomAD no frequency). This sequence change affects an acceptor splice site in intron 2 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). -

Retinitis pigmentosa 39 Pathogenic:2

Jun 13, 2017

Counsyl

Significance: Likely pathogenic

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

Oct 28, 2023

Baylor Genetics

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Usher syndrome type 2A Pathogenic:2

Aug 27, 2020

Natera, Inc.

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

Mar 17, 2024

Genomic Medicine Center of Excellence, King Faisal Specialist Hospital and Research Centre

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: research

- -

Rare genetic deafness Pathogenic:1

Nov 19, 2015

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.486-1G>C variant in USH2A has been reported in at least one individual wit h hearing loss (Cremers 2007), and was absent from large population studies. Thi s variant occurs in the invariant region (- 1,2) of the splice consensus sequenc e and is predicted to cause altered splicing leading to an abnormal or absent pr otein. Loss of function of the USH2A gene is an established disease mechanism in Usher syndrome. In summary, this variant meets our criteria to be classified as pathogenic for autosomal recessive Usher syndrome based on the predicted impact of the variant. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.63	D
BayesDel_noAF	Pathogenic	0.35
CADD	Pathogenic	34
DANN	Uncertain	1.0
Eigen	Pathogenic	1.1
Eigen_PC	Pathogenic	1.0
FATHMM_MKL	Uncertain	0.97	D
GERP RS		5.6

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Pathogenic	1.0
dbscSNV1_RF	Pathogenic	0.93
SpliceAI score (max)		0.95		Details are displayed if max score is > 0.2
DS_AG_spliceai		0.87		Position offset: -12
DS_AL_spliceai		0.95		Position offset: -1

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Other links and lift over

dbSNP: rs876657730; hg19: chr1-216592022;