rs397517985

Positions:

• chr1-215674889-C-A

Variant summary

Our verdict is Likely pathogenic. Variant got 9 ACMG points: 9P and 0B. PM1 PM2 PM5 PP3_Moderate PP5

The NM_206933.4(USH2A):​c.13022G>T​(p.Cys4341Phe) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. C4341G) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 32)
• Consequence: USH2A NM_206933.4 missense
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:1 U:1
• Conservation: PhyloP100: 5.89

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 Likely_pathogenic. Variant got 9 ACMG points.

• PM1: In a hotspot region, there are 3 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 6 uncertain in NM_206933.4
• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr1-215674889-C-T is described in Lovd as [Likely_pathogenic].
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.894
• PP5: Variant 1-215674889-C-A is Pathogenic according to our data. Variant chr1-215674889-C-A is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 48411.We mark this variant Likely_pathogenic, oryginal submissions are: {Uncertain_significance=1, Pathogenic=1}.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
USH2A	NM_206933.4	c.13022G>T	p.Cys4341Phe	missense_variant	63/72	ENST00000307340.8	NP_996816.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
USH2A	ENST00000307340.8	c.13022G>T	p.Cys4341Phe	missense_variant	63/72	1	NM_206933.4	ENSP00000305941.3
USH2A	ENST00000674083.1	c.13022G>T	p.Cys4341Phe	missense_variant	63/73			ENSP00000501296.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 37

GnomAD4 genome Cov.: 32

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Pathogenic:1 Uncertain:1

Revision: criteria provided, conflicting classifications

Submissions by phenotype

not provided Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Nov 25, 2023

This sequence change replaces cysteine, which is neutral and slightly polar, with phenylalanine, which is neutral and non-polar, at codon 4341 of the USH2A protein (p.Cys4341Phe). This variant is not present in population databases (gnomAD no frequency). This missense change has been observed in individual(s) with Usher syndrome (PMID: 25425308). ClinVar contains an entry for this variant (Variation ID: 48411). 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) performed at Invitae indicates that this missense variant is expected to disrupt USH2A protein function with a positive predictive value of 95%. For these reasons, this variant has been classified as Pathogenic. -

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

May 29, 2012

The Cys4341Phe variant in USH2A has not been reported in the literature nor prev iously identified by our laboratory. Computational analyses (biochemical amino a cid properties, conservation, AlignGVGD, PolyPhen2, and SIFT) suggest that the C ys4341Phe variant may impact the protein, though this information is not predict ive enough to determine pathogenicity. In summary, the clinical significance of this variant cannot be determined with certainty. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.49
BayesDel_addAF	Pathogenic	0.20	D
BayesDel_noAF	Uncertain	0.050
CADD	Uncertain	24
DANN	Uncertain	0.99
DEOGEN2	Benign	0.39	T
Eigen	Pathogenic	0.80
Eigen_PC	Pathogenic	0.74
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Benign	0.80	T
M_CAP	Pathogenic	0.47	D
MetaRNN	Pathogenic	0.89	D
MetaSVM	Uncertain	-0.25	T
MutationAssessor	Benign	2.0	M
PrimateAI	Benign	0.45	T
PROVEAN	Pathogenic	-7.6	D
REVEL	Uncertain	0.50
Sift	Uncertain	0.0010	D
Sift4G	Pathogenic	0.0	D
Polyphen		1.0	D
Vest4		0.84
MutPred		0.35		Gain of glycosylation at S4342 (P = 0.1033);
MVP		0.97
MPC		0.27
ClinPred		1.0	D
GERP RS		5.1
Varity_R		0.86
gMVP		0.59

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.050		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: rs397517985; hg19: chr1-215848231;