rs527236126

chr1-215650692-G-A

Variant summary

Our verdict is Uncertain significance. Variant got 5 ACMG points: 5P and 0B. PM1 PM2 PP5

The NM_206933.4(USH2A):c.14243C>T(p.Ser4748Phe) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000547 in 1,461,888 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Synonymous variant affecting the same amino acid position (i.e. S4748S) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000055 (0 hom.)
• Consequence: USH2A NM_206933.4 missense
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:4 U:2
• Conservation: PhyloP100: 10.0

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 Uncertain_significance. Variant got 5 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, 10 uncertain in NM_206933.4
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 1-215650692-G-A is Pathogenic according to our data. Variant chr1-215650692-G-A is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 143175.We mark this variant Likely_pathogenic, oryginal submissions are: {Pathogenic=3, Uncertain_significance=1}. Variant chr1-215650692-G-A is described in Lovd as [Pathogenic]. Variant chr1-215650692-G-A is described in Lovd as [Likely_pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
USH2A	NM_206933.4	c.14243C>T	p.Ser4748Phe	missense_variant	65/72	ENST00000307340.8

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
USH2A	ENST00000307340.8	c.14243C>T	p.Ser4748Phe	missense_variant	65/72	1	NM_206933.4	P1
USH2A	ENST00000674083.1	c.14243C>T	p.Ser4748Phe	missense_variant	65/73

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD3 exomes AF: 0.00000398 AC: 1 AN: 251252 Hom.: 0 AF XY: 0.00 AC XY: 0 AN XY: 135774

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.0000544

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000547 AC: 8 AN: 1461888 Hom.: 0 Cov.: 33 AF XY: 0.00000550 AC XY: 4 AN XY: 727246

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.000202

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

Asia WGS AF: 0.000577 AC: 2 AN: 3478

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Pathogenic:4 Uncertain:2

Revision: criteria provided, conflicting classifications

Submissions by phenotype

not provided Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Invitae

Nov 07, 2023

This sequence change replaces serine, which is neutral and polar, with phenylalanine, which is neutral and non-polar, at codon 4748 of the USH2A protein (p.Ser4748Phe). This variant is not present in population databases (gnomAD no frequency). This missense change has been observed in individuals with clinical features of inherited retinal dystrophy (PMID: 25078356, 25324289, 33105608). ClinVar contains an entry for this variant (Variation ID: 143175). 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 80%. For these reasons, this variant has been classified as Pathogenic. -

Retinitis pigmentosa 39 Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Baylor Genetics

Jul 01, 2023

- -

Retinal dystrophy Pathogenic:1

Pathogenic, criteria provided, single submitter

research

Dept Of Ophthalmology, Nagoya University

Oct 01, 2023

- -

Retinitis pigmentosa Pathogenic:1

Likely pathogenic, no assertion criteria provided

literature only

Department of Ophthalmology and Visual Sciences Kyoto University

-

- -

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

Uncertain significance, criteria provided, single submitter

clinical testing

Counsyl

Apr 25, 2018

- -

Leber congenital amaurosis Uncertain:1

Uncertain significance, no assertion criteria provided

clinical testing

Molecular Diagnostics Laboratory, Seoul National University Hospital

Sep 18, 2014

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.33
BayesDel_addAF	Uncertain	0.013	T
BayesDel_noAF	Benign	-0.22
Cadd	Uncertain	25
Dann	Uncertain	1.0
DEOGEN2	Benign	0.27	T
Eigen	Pathogenic	0.82
Eigen_PC	Pathogenic	0.77
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Benign	0.81	T
M_CAP	Pathogenic	0.33	D
MetaRNN	Uncertain	0.65	D
MetaSVM	Uncertain	-0.17	T
MutationAssessor	Uncertain	2.7	M
MutationTaster	Benign	1.0	D;D
PrimateAI	Benign	0.44	T
PROVEAN	Uncertain	-2.8	D
REVEL	Uncertain	0.38
Sift	Uncertain	0.0060	D
Sift4G	Uncertain	0.0020	D
Polyphen		0.99	D
Vest4		0.47
MutPred		0.54		Loss of catalytic residue at S4748 (P = 0.085);
MVP		0.98
MPC		0.15
ClinPred		0.94	D
GERP RS		5.7
Varity_R		0.21
gMVP		0.76

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		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: rs527236126; hg19: chr1-215824034;