chr1-215675351-C-A

Position:

• chr1-215675351-C-A

Variant summary

Our verdict is Likely pathogenic. Variant got 7 ACMG points: 7P and 0B. PM1 PM2 PM5 PP3

The NM_206933.4(USH2A):​c.12560G>T​(p.Arg4187Leu) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000889 in 1,461,820 control chromosomes in the GnomAD database, with no homozygous occurrence. 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. R4187H) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000089 (0 hom.)
• Consequence: USH2A NM_206933.4 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:5
• Conservation: PhyloP100: 0.264

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 7 ACMG points.

• PM1: In a hotspot region, there are 3 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 1 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 chr1-215675351-C-G is described in ClinVar as [Likely_pathogenic]. Clinvar id is 2747886.Status of the report is criteria_provided_single_submitter, 1 stars.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.828

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
USH2A	NM_206933.4	c.12560G>T	p.Arg4187Leu	missense_variant	63/72	ENST00000307340.8

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
USH2A	ENST00000307340.8	c.12560G>T	p.Arg4187Leu	missense_variant	63/72	1	NM_206933.4	P1
USH2A	ENST00000674083.1	c.12560G>T	p.Arg4187Leu	missense_variant	63/73

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD3 exomes AF: 0.00000801 AC: 2 AN: 249758 Hom.: 0 AF XY: 0.00000740 AC XY: 1 AN XY: 135130

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.0000579

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: 0.00

GnomAD4 exome AF: 0.00000889 AC: 13 AN: 1461820 Hom.: 0 Cov.: 37 AF XY: 0.0000110 AC XY: 8 AN XY: 727202

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.0000671

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.0000252

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000809

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

Alfa AF: 0.0000282 Hom.: 0

ExAC AF: 0.00000824 AC: 1

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:5

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Usher syndrome type 2A Uncertain:2

Uncertain significance, criteria provided, single submitter	clinical testing	Genome-Nilou Lab	Nov 04, 2023	- -
Uncertain significance, no assertion criteria provided	clinical testing	Natera, Inc.	Nov 11, 2019	- -

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

Mar 02, 2015

The p.Arg4187Leu variant in USH2A has not been previously reported in individual s with hearing loss. This variant has been identified in 1/11530 Latino chromos omes by the Exome Aggregation Consortium (ExAC, http://exac.broadinstitute.org; dbSNP rs147304271. Although this variant has been seen in the general populatio n, its frequency is not high enough to rule out a pathogenic role. Computationa l prediction tools and conservation analyses do not provide strong support for o r against an impact to the protein. In summary, the clinical significance of the p.Arg4187Leu variant is uncertain. -

not provided Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Aug 19, 2022

This sequence change replaces arginine, which is basic and polar, with leucine, which is neutral and non-polar, at codon 4187 of the USH2A protein (p.Arg4187Leu). This variant is present in population databases (rs147304271, gnomAD 0.006%). This variant has not been reported in the literature in individuals affected with USH2A-related conditions. ClinVar contains an entry for this variant (Variation ID: 229618). Algorithms developed to predict the effect of missense changes on protein structure and function (SIFT, PolyPhen-2, Align-GVGD) all suggest that this variant is likely to be disruptive. 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

Nov 04, 2023

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.19
BayesDel_addAF	Benign	-0.11	T
BayesDel_noAF	Benign	-0.21
CADD	Benign	17
DANN	Uncertain	1.0
DEOGEN2	Benign	0.20	T
Eigen	Benign	0.12
Eigen_PC	Benign	0.13
FATHMM_MKL	Uncertain	0.88	D
LIST_S2	Benign	0.84	T
M_CAP	Pathogenic	0.34	D
MetaRNN	Pathogenic	0.83	D
MetaSVM	Benign	-0.91	T
MutationAssessor	Uncertain	2.6	M
MutationTaster	Benign	0.95	N;N
PrimateAI	Benign	0.20	T
PROVEAN	Uncertain	-3.4	D
REVEL	Uncertain	0.32
Sift	Uncertain	0.024	D
Sift4G	Uncertain	0.032	D
Polyphen		0.84	P
Vest4		0.66
MutPred		0.65		Loss of MoRF binding (P = 0.0284);
MVP		0.95
MPC		0.19
ClinPred		0.91	D
GERP RS		3.0
Varity_R		0.46
gMVP		0.81

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

Other links and lift over

dbSNP: rs147304271; hg19: chr1-215848693;